FLOT曲线图

来源：互联网发布：易语言魔域破仓库源码编辑：程序博客网时间：2024/04/29 13:17

JSP页面代码：

<div class="fy_developer">
<p class="pdl15 f16 c222 pdt15">API调用次数</p><input type="hidden" id="firstDate" />
<p class="pdl15 f16 c222 pdt15" style="font-size: x-small">单位(次)</p>
<div id="placeholder" style="width:95%;height:300px;margin-left:auto; margin-right:auto; margin-top: 1px;" ></div>
</div>

js文件中

/////////////////////////////////////////////////曲线图////////////////////////////////////////////////////////////
chart('getCallApiChart.action',"");

//API统计功能

});

jquery.flot.js

/* Javascript plotting library for jQuery, v. 0.5.
* Download by http://www.jb51.net
* Released under the MIT license by IOLA, December 2007.
*
*/

(function($) {
function Plot(target_, data_, options_) {
// data is on the form:
// [ series1, series2 ... ]
// where series is either just the data as [ [x1, y1], [x2, y2], ... ]
// or { data: [ [x1, y1], [x2, y2], ... ], label: "some label" }

var series = [],
options = {
// the color theme used for graphs
colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
legend: {
show: true,
noColumns: 1, // number of colums in legend table
labelFormatter: null, // fn: string -> string
labelBoxBorderColor: "#ccc", // border color for the little label boxes
container: null, // container (as jQuery object) to put legend in, null means default on top of graph
position: "ne", // position of default legend container within plot
margin: 5, // distance from grid edge to default legend container within plot
backgroundColor: null, // null means auto-detect
backgroundOpacity: 0.85 // set to 0 to avoid background
},
xaxis: {
mode: null, // null or "time"
min: null, // min. value to show, null means set automatically
max: null, // max. value to show, null means set automatically
autoscaleMargin: null, // margin in % to add if auto-setting min/max
ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
tickFormatter: null, // fn: number -> string
labelWidth: null, // size of tick labels in pixels
labelHeight: null,

// mode specific options
tickDecimals: null, // no. of decimals, null means auto
tickSize: null, // number or [number, "unit"]
minTickSize: null, // number or [number, "unit"]
monthNames: null, // list of names of months
timeformat: null // format string to use
},
yaxis: {
autoscaleMargin: 0.02
},
x2axis: {
autoscaleMargin: null
},
y2axis: {
autoscaleMargin: 0.02
},
points: {
show: false,
radius: 3,
lineWidth: 2, // in pixels
fill: true,
fillColor: "#ffffff"
},
lines: {
show: false,
lineWidth: 2, // in pixels
fill: false,
fillColor: null
},
bars: {
show: false,
lineWidth: 2, // in pixels
barWidth: 1, // in units of the x axis
fill: true,
fillColor: null,
align: "left" // or "center"
},
grid: {
color: "#545454", // primary color used for outline and labels
backgroundColor: null, // null for transparent, else color
tickColor: "#dddddd", // color used for the ticks
labelMargin: 5, // in pixels
borderWidth: 2,
markings: null, // array of ranges or fn: axes -> array of ranges
markingsColor: "#f4f4f4",
markingsLineWidth: 2,
// interactive stuff
clickable: false,
hoverable: false,
autoHighlight: true, // highlight in case mouse is near
mouseActiveRadius: 10 // how far the mouse can be away to activate an item
},
selection: {
mode: null, // one of null, "x", "y" or "xy"
color: "#e8cfac"
},
shadowSize: 4
},
canvas = null, // the canvas for the plot itself
overlay = null, // canvas for interactive stuff on top of plot
eventHolder = null, // jQuery object that events should be bound to
ctx = null, octx = null,
target = target_,
axes = { xaxis: {}, yaxis: {}, x2axis: {}, y2axis: {} },
plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
canvasWidth = 0, canvasHeight = 0,
plotWidth = 0, plotHeight = 0,
// dedicated to storing data for buggy standard compliance cases
workarounds = {};

this.setData = setData;
this.setupGrid = setupGrid;
this.draw = draw;
this.clearSelection = clearSelection;
this.setSelection = setSelection;
this.getCanvas = function() { return canvas; };
this.getPlotOffset = function() { return plotOffset; };
this.getData = function() { return series; };
this.getAxes = function() { return axes; };
this.highlight = highlight;
this.unhighlight = unhighlight;

// initialize
parseOptions(options_);
setData(data_);
constructCanvas();
setupGrid();
draw();

function setData(d) {
series = parseData(d);

fillInSeriesOptions();
processData();
}

function parseData(d) {
var res = [];
for (var i = 0; i < d.length; ++i) {
var s;
if (d[i].data) {
s = {};
for (var v in d[i])
s[v] = d[i][v];
}
else {
s = { data: d[i] };
}
res.push(s);
}

return res;
}

function parseOptions(o) {
$.extend(true, options, o);

// backwards compatibility, to be removed in future
if (options.xaxis.noTicks && options.xaxis.ticks == null)
options.xaxis.ticks = options.xaxis.noTicks;
if (options.yaxis.noTicks && options.yaxis.ticks == null)
options.yaxis.ticks = options.yaxis.noTicks;
if (options.grid.coloredAreas)
options.grid.markings = options.grid.coloredAreas;
if (options.grid.coloredAreasColor)
options.grid.markingsColor = options.grid.coloredAreasColor;
}

function fillInSeriesOptions() {
var i;

// collect what we already got of colors
var neededColors = series.length,
usedColors = [],
assignedColors = [];
for (i = 0; i < series.length; ++i) {
var sc = series[i].color;
if (sc != null) {
--neededColors;
if (typeof sc == "number")
assignedColors.push(sc);
else
usedColors.push(parseColor(series[i].color));
}
}

// we might need to generate more colors if higher indices
// are assigned
for (i = 0; i < assignedColors.length; ++i) {
neededColors = Math.max(neededColors, assignedColors[i] + 1);
}

// produce colors as needed
var colors = [], variation = 0;
i = 0;
while (colors.length < neededColors) {
var c;
if (options.colors.length == i) // check degenerate case
c = new Color(100, 100, 100);
else
c = parseColor(options.colors[i]);

// vary color if needed
var sign = variation % 2 == 1 ? -1 : 1;
var factor = 1 + sign * Math.ceil(variation / 2) * 0.2;
c.scale(factor, factor, factor);

// FIXME: if we're getting to close to something else,
// we should probably skip this one
colors.push(c);

++i;
if (i >= options.colors.length) {
i = 0;
++variation;
}
}

// fill in the options
var colori = 0, s;
for (i = 0; i < series.length; ++i) {
s = series[i];

// assign colors
if (s.color == null) {
s.color = colors[colori].toString();
++colori;
}
else if (typeof s.color == "number")
s.color = colors[s.color].toString();

// copy the rest
s.lines = $.extend(true, {}, options.lines, s.lines);
s.points = $.extend(true, {}, options.points, s.points);
s.bars = $.extend(true, {}, options.bars, s.bars);
if (s.shadowSize == null)
s.shadowSize = options.shadowSize;
if (s.xaxis && s.xaxis == 2)
s.xaxis = axes.x2axis;
else
s.xaxis = axes.xaxis;
if (s.yaxis && s.yaxis == 2)
s.yaxis = axes.y2axis;
else
s.yaxis = axes.yaxis;
}
}

function processData() {
var topSentry = Number.POSITIVE_INFINITY,
bottomSentry = Number.NEGATIVE_INFINITY,
axis;

for (axis in axes) {
axes[axis].datamin = topSentry;
axes[axis].datamax = bottomSentry;
axes[axis].used = false;
}

for (var i = 0; i < series.length; ++i) {
var data = series[i].data,
axisx = series[i].xaxis,
axisy = series[i].yaxis,
mindelta = 0, maxdelta = 0;

// make sure we got room for the bar
if (series[i].bars.show) {
mindelta = series[i].bars.align == "left" ? 0 : -series[i].bars.barWidth/2;
maxdelta = mindelta + series[i].bars.barWidth;
}

axisx.used = axisy.used = true;
for (var j = 0; j < data.length; ++j) {
if (data[j] == null)
continue;

var x = data[j][0], y = data[j][1];

// convert to number
if (x != null && !isNaN(x = +x)) {
if (x + mindelta < axisx.datamin)
axisx.datamin = x + mindelta;
if (x + maxdelta > axisx.datamax)
axisx.datamax = x + maxdelta;
}

if (y != null && !isNaN(y = +y)) {
if (y < axisy.datamin)
axisy.datamin = y;
if (y > axisy.datamax)
axisy.datamax = y;
}

if (x == null || y == null || isNaN(x) || isNaN(y))
data[j] = null; // mark this point as invalid
}
}

for (axis in axes) {
if (axes[axis].datamin == topSentry)
axes[axis].datamin = 0;
if (axes[axis].datamax == bottomSentry)
axes[axis].datamax = 1;
}
}

function constructCanvas() {
canvasWidth = target.width();
canvasHeight = target.height();
target.html(""); // clear target
target.css("position", "relative"); // for positioning labels and overlay

if (canvasWidth <= 0 || canvasHeight <= 0)
throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;

// the canvas
canvas = $('<canvas width="' + canvasWidth + '" height="' + canvasHeight + '"></canvas>').appendTo(target).get(0);
if ($.browser.msie) // excanvas hack
canvas = window.G_vmlCanvasManager.initElement(canvas);
ctx = canvas.getContext("2d");

// overlay canvas for interactive features
overlay = $('<canvas style="position:absolute;left:0px;top:0px;" width="' + canvasWidth + '" height="' + canvasHeight + '"></canvas>').appendTo(target).get(0);
if ($.browser.msie) // excanvas hack
overlay = window.G_vmlCanvasManager.initElement(overlay);
octx = overlay.getContext("2d");

// we include the canvas in the event holder too, because IE 7
// sometimes has trouble with the stacking order
eventHolder = $([overlay, canvas]);

// bind events
if (options.selection.mode != null || options.grid.hoverable) {
// FIXME: temp. work-around until jQuery bug 1871 is fixed
eventHolder.each(function () {
this.onmousemove = onMouseMove;
});

if (options.selection.mode != null)
eventHolder.mousedown(onMouseDown);
}

if (options.grid.clickable)
eventHolder.click(onClick);
}

function setupGrid() {
function setupAxis(axis, options) {
setRange(axis, options);
prepareTickGeneration(axis, options);
setTicks(axis, options);
// add transformation helpers
if (axis == axes.xaxis || axis == axes.x2axis) {
// data point to canvas coordinate
axis.p2c = function (p) { return (p - axis.min) * axis.scale; };
// canvas coordinate to data point
axis.c2p = function (c) { return axis.min + c / axis.scale; };
}
else {
axis.p2c = function (p) { return (axis.max - p) * axis.scale; };
axis.c2p = function (p) { return axis.max - p / axis.scale; };
}
}

for (var axis in axes)
setupAxis(axes[axis], options[axis]);

setSpacing();
insertLabels();
insertLegend();
}

function setRange(axis, axisOptions) {
var min = axisOptions.min != null ? axisOptions.min : axis.datamin;
var max = axisOptions.max != null ? axisOptions.max : axis.datamax;

if (max - min == 0.0) {
// degenerate case
var widen;
if (max == 0.0)
widen = 1.0;
else
widen = 0.01;

min -= widen;
max += widen;
}
else {
// consider autoscaling
var margin = axisOptions.autoscaleMargin;
if (margin != null) {
if (axisOptions.min == null) {
min -= (max - min) * margin;
// make sure we don't go below zero if all values
// are positive
if (min < 0 && axis.datamin >= 0)
min = 0;
}
if (axisOptions.max == null) {
max += (max - min) * margin;
if (max > 0 && axis.datamax <= 0)
max = 0;
}
}
}
axis.min = min;
axis.max = max;
}

function prepareTickGeneration(axis, axisOptions) {
// estimate number of ticks
var noTicks;
if (typeof axisOptions.ticks == "number" && axisOptions.ticks > 0)
noTicks = axisOptions.ticks;
else if (axis == axes.xaxis || axis == axes.x2axis)
noTicks = canvasWidth / 100;
else
noTicks = canvasHeight / 60;

var delta = (axis.max - axis.min) / noTicks;
var size, generator, unit, formatter, i, magn, norm;

if (axisOptions.mode == "time") {
// pretty handling of time

function formatDate(d, fmt, monthNames) {
var leftPad = function(n) {
n = "" + n;
return n.length == 1 ? "0" + n : n;
};

var r = [];
var escape = false;
if (monthNames == null)
monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
for (var i = 0; i < fmt.length; ++i) {
var c = fmt.charAt(i);

if (escape) {
switch (c) {
case 'h': c = "" + d.getUTCHours(); break;
case 'H': c = leftPad(d.getUTCHours()); break;
case 'M': c = leftPad(d.getUTCMinutes()); break;
case 'S': c = leftPad(d.getUTCSeconds()); break;
case 'd': c = "" + d.getUTCDate(); break;
case 'm': c = "" + (d.getUTCMonth() + 1); break;
case 'y': c = "" + d.getUTCFullYear(); break;
case 'b': c = "" + monthNames[d.getUTCMonth()]; break;
}
r.push(c);
escape = false;
}
else {
if (c == "%")
escape = true;
else
r.push(c);
}
}
return r.join("");
}


// map of app. size of time units in milliseconds
var timeUnitSize = {
"second": 1000,
"minute": 60 * 1000,
"hour": 60 * 60 * 1000,
"day": 24 * 60 * 60 * 1000,
"month": 30 * 24 * 60 * 60 * 1000,
"year": 365.2425 * 24 * 60 * 60 * 1000
};

// the allowed tick sizes, after 1 year we use
// an integer algorithm
var spec = [
[1, "second"], [2, "second"], [5, "second"], [10, "second"],
[30, "second"],
[1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
[30, "minute"],
[1, "hour"], [2, "hour"], [4, "hour"],
[8, "hour"], [12, "hour"],
[1, "day"], [2, "day"], [3, "day"],
[0.25, "month"], [0.5, "month"], [1, "month"],
[2, "month"], [3, "month"], [6, "month"],
[1, "year"]
];

var minSize = 0;
if (axisOptions.minTickSize != null) {
if (typeof axisOptions.tickSize == "number")
minSize = axisOptions.tickSize;
else
minSize = axisOptions.minTickSize[0] * timeUnitSize[axisOptions.minTickSize[1]];
}

for (i = 0; i < spec.length - 1; ++i)
if (delta < (spec[i][0] * timeUnitSize[spec[i][1]]
+ spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize)
break;
size = spec[i][0];
unit = spec[i][1];

// special-case the possibility of several years
if (unit == "year") {
magn = Math.pow(10, Math.floor(Math.log(delta / timeUnitSize.year) / Math.LN10));
norm = (delta / timeUnitSize.year) / magn;
if (norm < 1.5)
size = 1;
else if (norm < 3)
size = 2;
else if (norm < 7.5)
size = 5;
else
size = 10;

size *= magn;
}

if (axisOptions.tickSize) {
size = axisOptions.tickSize[0];
unit = axisOptions.tickSize[1];
}

generator = function(axis) {
var ticks = [],
tickSize = axis.tickSize[0], unit = axis.tickSize[1],
d = new Date(axis.min);

var step = tickSize * timeUnitSize[unit];

if (unit == "second")
d.setUTCSeconds(floorInBase(d.getUTCSeconds(), tickSize));
if (unit == "minute")
d.setUTCMinutes(floorInBase(d.getUTCMinutes(), tickSize));
if (unit == "hour")
d.setUTCHours(floorInBase(d.getUTCHours(), tickSize));
if (unit == "month")
d.setUTCMonth(floorInBase(d.getUTCMonth(), tickSize));
if (unit == "year")
d.setUTCFullYear(floorInBase(d.getUTCFullYear(), tickSize));

// reset smaller components
d.setUTCMilliseconds(0);
if (step >= timeUnitSize.minute)
d.setUTCSeconds(0);
if (step >= timeUnitSize.hour)
d.setUTCMinutes(0);
if (step >= timeUnitSize.day)
d.setUTCHours(0);
if (step >= timeUnitSize.day * 4)
d.setUTCDate(1);
if (step >= timeUnitSize.year)
d.setUTCMonth(0);

var carry = 0, v = Number.NaN, prev;
do {
prev = v;
v = d.getTime();
ticks.push({ v: v, label: axis.tickFormatter(v, axis) });
if (unit == "month") {
if (tickSize < 1) {
// a bit complicated - we'll divide the month
// up but we need to take care of fractions
// so we don't end up in the middle of a day
d.setUTCDate(1);
var start = d.getTime();
d.setUTCMonth(d.getUTCMonth() + 1);
var end = d.getTime();
d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
carry = d.getUTCHours();
d.setUTCHours(0);
}
else
d.setUTCMonth(d.getUTCMonth() + tickSize);
}
else if (unit == "year") {
d.setUTCFullYear(d.getUTCFullYear() + tickSize);
}
else
d.setTime(v + step);
} while (v < axis.max && v != prev);

return ticks;
};

formatter = function (v, axis) {
var d = new Date(v);

// first check global format
if (axisOptions.timeformat != null)
return formatDate(d, axisOptions.timeformat, axisOptions.monthNames);

var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
var span = axis.max - axis.min;

if (t < timeUnitSize.minute)
fmt = "%h:%M:%S";
else if (t < timeUnitSize.day) {
if (span < 2 * timeUnitSize.day)
fmt = "%h:%M";
else
fmt = "%b %d %h:%M";
}
else if (t < timeUnitSize.month)
fmt = "%b %d";
else if (t < timeUnitSize.year) {
if (span < timeUnitSize.year)
fmt = "%b";
else
fmt = "%b %y";
}
else
fmt = "%y";

return formatDate(d, fmt, axisOptions.monthNames);
};
}
else {
// pretty rounding of base-10 numbers
var maxDec = axisOptions.tickDecimals;
var dec = -Math.floor(Math.log(delta) / Math.LN10);
if (maxDec != null && dec > maxDec)
dec = maxDec;

magn = Math.pow(10, -dec);
norm = delta / magn; // norm is between 1.0 and 10.0

if (norm < 1.5)
size = 1;
else if (norm < 3) {
size = 2;
// special case for 2.5, requires an extra decimal
if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
size = 2.5;
++dec;
}
}
else if (norm < 7.5)
size = 5;
else
size = 10;

size *= magn;

if (axisOptions.minTickSize != null && size < axisOptions.minTickSize)
size = axisOptions.minTickSize;

if (axisOptions.tickSize != null)
size = axisOptions.tickSize;

axis.tickDecimals = Math.max(0, (maxDec != null) ? maxDec : dec);

generator = function (axis) {
var ticks = [];

// spew out all possible ticks
var start = floorInBase(axis.min, axis.tickSize),
i = 0, v = Number.NaN, prev;
do {
prev = v;
v = start + i * axis.tickSize;
ticks.push({ v: v, label: axis.tickFormatter(v, axis) });
++i;
} while (v < axis.max && v != prev);
return ticks;
};

formatter = function (v, axis) {
return v.toFixed(axis.tickDecimals);
};
}

axis.tickSize = unit ? [size, unit] : size;
axis.tickGenerator = generator;
if ($.isFunction(axisOptions.tickFormatter))
axis.tickFormatter = function (v, axis) { return "" + axisOptions.tickFormatter(v, axis); };
else
axis.tickFormatter = formatter;
if (axisOptions.labelWidth != null)
axis.labelWidth = axisOptions.labelWidth;
if (axisOptions.labelHeight != null)
axis.labelHeight = axisOptions.labelHeight;
}

function setTicks(axis, axisOptions) {
axis.ticks = [];

if (!axis.used)
return;

if (axisOptions.ticks == null)
axis.ticks = axis.tickGenerator(axis);
else if (typeof axisOptions.ticks == "number") {
if (axisOptions.ticks > 0)
axis.ticks = axis.tickGenerator(axis);
}
else if (axisOptions.ticks) {
var ticks = axisOptions.ticks;

if ($.isFunction(ticks))
// generate the ticks
ticks = ticks({ min: axis.min, max: axis.max });

// clean up the user-supplied ticks, copy them over
var i, v;
for (i = 0; i < ticks.length; ++i) {
var label = null;
var t = ticks[i];
if (typeof t == "object") {
v = t[0];
if (t.length > 1)
label = t[1];
}
else
v = t;
if (label == null)
label = axis.tickFormatter(v, axis);
axis.ticks[i] = { v: v, label: label };
}
}

if (axisOptions.autoscaleMargin != null && axis.ticks.length > 0) {
// snap to ticks
if (axisOptions.min == null)
axis.min = Math.min(axis.min, axis.ticks[0].v);
if (axisOptions.max == null && axis.ticks.length > 1)
axis.max = Math.min(axis.max, axis.ticks[axis.ticks.length - 1].v);
}
}

function setSpacing() {
function measureXLabels(axis) {
// to avoid measuring the widths of the labels, we
// construct fixed-size boxes and put the labels inside
// them, we don't need the exact figures and the
// fixed-size box content is easy to center
if (axis.labelWidth == null)
axis.labelWidth = canvasWidth / 6;

// measure x label heights
if (axis.labelHeight == null) {
labels = [];
for (i = 0; i < axis.ticks.length; ++i) {
l = axis.ticks[i].label;
if (l)
labels.push('<div class="tickLabel" style="float:left;width:' + axis.labelWidth + 'px">' + l + '</div>');
}

axis.labelHeight = 0;
if (labels.length > 0) {
var dummyDiv = $('<div style="position:absolute;top:-10000px;width:10000px;font-size:smaller">'
+ labels.join("") + '<div style="clear:left"></div></div>').appendTo(target);
axis.labelHeight = dummyDiv.height();
dummyDiv.remove();
}
}
}

function measureYLabels(axis) {
if (axis.labelWidth == null || axis.labelHeight == null) {
var i, labels = [], l;
// calculate y label dimensions
for (i = 0; i < axis.ticks.length; ++i) {
l = axis.ticks[i].label;
if (l)
labels.push('<div class="tickLabel">' + l + '</div>');
}

if (labels.length > 0) {
var dummyDiv = $('<div style="position:absolute;top:-10000px;font-size:smaller">'
+ labels.join("") + '</div>').appendTo(target);
if (axis.labelWidth == null)
axis.labelWidth = dummyDiv.width();
if (axis.labelHeight == null)
axis.labelHeight = dummyDiv.find("div").height();
dummyDiv.remove();
}

if (axis.labelWidth == null)
axis.labelWidth = 0;
if (axis.labelHeight == null)
axis.labelHeight = 0;
}
}

measureXLabels(axes.xaxis);
measureYLabels(axes.yaxis);
measureXLabels(axes.x2axis);
measureYLabels(axes.y2axis);

// get the most space needed around the grid for things
// that may stick out
var maxOutset = options.grid.borderWidth / 2;
for (i = 0; i < series.length; ++i)
maxOutset = Math.max(maxOutset, 2 * (series[i].points.radius + series[i].points.lineWidth/2));

plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = maxOutset;

if (axes.xaxis.labelHeight > 0)
plotOffset.bottom = Math.max(maxOutset, axes.xaxis.labelHeight + options.grid.labelMargin);
if (axes.yaxis.labelWidth > 0)
plotOffset.left = Math.max(maxOutset, axes.yaxis.labelWidth + options.grid.labelMargin);

if (axes.x2axis.labelHeight > 0)
plotOffset.top = Math.max(maxOutset, axes.x2axis.labelHeight + options.grid.labelMargin);

if (axes.y2axis.labelWidth > 0)
plotOffset.right = Math.max(maxOutset, axes.y2axis.labelWidth + options.grid.labelMargin);

plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;

// precompute how much the axis is scaling a point in canvas space
axes.xaxis.scale = plotWidth / (axes.xaxis.max - axes.xaxis.min);
axes.yaxis.scale = plotHeight / (axes.yaxis.max - axes.yaxis.min);
axes.x2axis.scale = plotWidth / (axes.x2axis.max - axes.x2axis.min);
axes.y2axis.scale = plotHeight / (axes.y2axis.max - axes.y2axis.min);
}

function draw() {
drawGrid();
for (var i = 0; i < series.length; i++) {
drawSeries(series[i]);
}
}

function extractRange(ranges, coord) {
var firstAxis = coord + "axis",
secondaryAxis = coord + "2axis",
axis, from, to, reverse;

if (ranges[firstAxis]) {
axis = axes[firstAxis];
from = ranges[firstAxis].from;
to = ranges[firstAxis].to;
}
else if (ranges[secondaryAxis]) {
axis = axes[secondaryAxis];
from = ranges[secondaryAxis].from;
to = ranges[secondaryAxis].to;
}
else {
// backwards-compat stuff - to be removed in future
axis = axes[firstAxis];
from = ranges[coord + "1"];
to = ranges[coord + "2"];
}

// auto-reverse as an added bonus
if (from != null && to != null && from > to)
return { from: to, to: from, axis: axis };

return { from: from, to: to, axis: axis };
}

function drawGrid() {
var i;

ctx.save();
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
ctx.translate(plotOffset.left, plotOffset.top);

// draw background, if any
if (options.grid.backgroundColor) {
ctx.fillStyle = options.grid.backgroundColor;
ctx.fillRect(0, 0, plotWidth, plotHeight);
}

// draw markings
if (options.grid.markings) {
var markings = options.grid.markings;
if ($.isFunction(markings))
// xmin etc. are backwards-compatible, to be removed in future
markings = markings({ xmin: axes.xaxis.min, xmax: axes.xaxis.max, ymin: axes.yaxis.min, ymax: axes.yaxis.max, xaxis: axes.xaxis, yaxis: axes.yaxis, x2axis: axes.x2axis, y2axis: axes.y2axis });

for (i = 0; i < markings.length; ++i) {
var m = markings[i],
xrange = extractRange(m, "x"),
yrange = extractRange(m, "y");

// fill in missing
if (xrange.from == null)
xrange.from = xrange.axis.min;
if (xrange.to == null)
xrange.to = xrange.axis.max;
if (yrange.from == null)
yrange.from = yrange.axis.min;
if (yrange.to == null)
yrange.to = yrange.axis.max;

// clip
if (xrange.to < xrange.axis.min || xrange.from > xrange.axis.max ||
yrange.to < yrange.axis.min || yrange.from > yrange.axis.max)
continue;

xrange.from = Math.max(xrange.from, xrange.axis.min);
xrange.to = Math.min(xrange.to, xrange.axis.max);
yrange.from = Math.max(yrange.from, yrange.axis.min);
yrange.to = Math.min(yrange.to, yrange.axis.max);

if (xrange.from == xrange.to && yrange.from == yrange.to)
continue;

// then draw
xrange.from = xrange.axis.p2c(xrange.from);
xrange.to = xrange.axis.p2c(xrange.to);
yrange.from = yrange.axis.p2c(yrange.from);
yrange.to = yrange.axis.p2c(yrange.to);

if (xrange.from == xrange.to || yrange.from == yrange.to) {
// draw line
ctx.strokeStyle = m.color || options.grid.markingsColor;
ctx.lineWidth = m.lineWidth || options.grid.markingsLineWidth;
ctx.moveTo(Math.floor(xrange.from), Math.floor(yrange.from));
ctx.lineTo(Math.floor(xrange.to), Math.floor(yrange.to));
ctx.stroke();
}
else {
// fill area
ctx.fillStyle = m.color || options.grid.markingsColor;
ctx.fillRect(Math.floor(xrange.from),
Math.floor(yrange.to),
Math.floor(xrange.to - xrange.from),
Math.floor(yrange.from - yrange.to));
}
}
}

// draw the inner grid
ctx.lineWidth = 1;
ctx.strokeStyle = options.grid.tickColor;
ctx.beginPath();
var v, axis = axes.xaxis;
for (i = 0; i < axis.ticks.length; ++i) {
v = axis.ticks[i].v;
if (v <= axis.min || v >= axes.xaxis.max)
continue; // skip those lying on the axes

ctx.moveTo(Math.floor(axis.p2c(v)) + ctx.lineWidth/2, 0);
ctx.lineTo(Math.floor(axis.p2c(v)) + ctx.lineWidth/2, plotHeight);
}

axis = axes.yaxis;
for (i = 0; i < axis.ticks.length; ++i) {
v = axis.ticks[i].v;
if (v <= axis.min || v >= axis.max)
continue;

ctx.moveTo(0, Math.floor(axis.p2c(v)) + ctx.lineWidth/2);
ctx.lineTo(plotWidth, Math.floor(axis.p2c(v)) + ctx.lineWidth/2);
}

axis = axes.x2axis;
for (i = 0; i < axis.ticks.length; ++i) {
v = axis.ticks[i].v;
if (v <= axis.min || v >= axis.max)
continue;

ctx.moveTo(Math.floor(axis.p2c(v)) + ctx.lineWidth/2, -5);
ctx.lineTo(Math.floor(axis.p2c(v)) + ctx.lineWidth/2, 5);
}

axis = axes.y2axis;
for (i = 0; i < axis.ticks.length; ++i) {
v = axis.ticks[i].v;
if (v <= axis.min || v >= axis.max)
continue;

ctx.moveTo(plotWidth-5, Math.floor(axis.p2c(v)) + ctx.lineWidth/2);
ctx.lineTo(plotWidth+5, Math.floor(axis.p2c(v)) + ctx.lineWidth/2);
}

ctx.stroke();

if (options.grid.borderWidth) {
// draw border
ctx.lineWidth = options.grid.borderWidth;
ctx.strokeStyle = options.grid.color;
ctx.lineJoin = "round";
//画两条线
ctx.strokeRect(0, plotHeight, plotWidth, 0);
ctx.strokeRect(0, 0, 0, plotHeight);
//画图时四条线
//ctx.strokeRect(0, 0, plotWidth, plotHeight);
}

ctx.restore();
}

function insertLabels() {
target.find(".tickLabels").remove();

var html = '<div class="tickLabels" style="font-size:smaller;color:' + options.grid.color + '">';

function addLabels(axis, labelGenerator) {
for (var i = 0; i < axis.ticks.length; ++i) {
var tick = axis.ticks[i];
if (!tick.label || tick.v < axis.min || tick.v > axis.max)
continue;
html += labelGenerator(tick, axis);
}
}

addLabels(axes.xaxis, function (tick, axis) {
return '<div style="position:absolute;top:' + (plotOffset.top + plotHeight + options.grid.labelMargin) + 'px;left:' + (plotOffset.left + axis.p2c(tick.v) - axis.labelWidth/2) + 'px;width:' + axis.labelWidth + 'px;text-align:center" class="tickLabel">' + tick.label + "</div>";
});


addLabels(axes.yaxis, function (tick, axis) {
return '<div style="position:absolute;top:' + (plotOffset.top + axis.p2c(tick.v) - axis.labelHeight/2) + 'px;right:' + (plotOffset.right + plotWidth + options.grid.labelMargin) + 'px;width:' + axis.labelWidth + 'px;text-align:right" class="tickLabel">' + tick.label + "</div>";
});

addLabels(axes.x2axis, function (tick, axis) {
return '<div style="position:absolute;bottom:' + (plotOffset.bottom + plotHeight + options.grid.labelMargin) + 'px;left:' + (plotOffset.left + axis.p2c(tick.v) - axis.labelWidth/2) + 'px;width:' + axis.labelWidth + 'px;text-align:center" class="tickLabel">' + tick.label + "</div>";
});

addLabels(axes.y2axis, function (tick, axis) {
return '<div style="position:absolute;top:' + (plotOffset.top + axis.p2c(tick.v) - axis.labelHeight/2) + 'px;left:' + (plotOffset.left + plotWidth + options.grid.labelMargin) +'px;width:' + axis.labelWidth + 'px;text-align:left" class="tickLabel">' + tick.label + "</div>";
});

html += '</div>';

target.append(html);
}

function drawSeries(series) {
if (series.lines.show || (!series.bars.show && !series.points.show))
drawSeriesLines(series);
if (series.bars.show)
drawSeriesBars(series);
if (series.points.show)
drawSeriesPoints(series);
}

function drawSeriesLines(series) {
function plotLine(data, offset, axisx, axisy) {
var prev, cur = null, drawx = null, drawy = null;

ctx.beginPath();
for (var i = 0; i < data.length; ++i) {
prev = cur;
cur = data[i];

if (prev == null || cur == null)
continue;

var x1 = prev[0], y1 = prev[1],
x2 = cur[0], y2 = cur[1];

// clip with ymin
if (y1 <= y2 && y1 < axisy.min) {
if (y2 < axisy.min)
continue; // line segment is outside
// compute new intersection point
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min) {
if (y1 < axisy.min)
continue;
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}

// clip with ymax
if (y1 >= y2 && y1 > axisy.max) {
if (y2 > axisy.max)
continue;
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max) {
if (y1 > axisy.max)
continue;
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}

// clip with xmin
if (x1 <= x2 && x1 < axisx.min) {
if (x2 < axisx.min)
continue;
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.min;
}
else if (x2 <= x1 && x2 < axisx.min) {
if (x1 < axisx.min)
continue;
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.min;
}

// clip with xmax
if (x1 >= x2 && x1 > axisx.max) {
if (x2 > axisx.max)
continue;
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.max;
}
else if (x2 >= x1 && x2 > axisx.max) {
if (x1 > axisx.max)
continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
}

if (drawx != axisx.p2c(x1) || drawy != axisy.p2c(y1) + offset)
ctx.moveTo(axisx.p2c(x1), axisy.p2c(y1) + offset);

drawx = axisx.p2c(x2);
drawy = axisy.p2c(y2) + offset;
ctx.lineTo(drawx, drawy);
}
ctx.stroke();
}

function plotLineArea(data, axisx, axisy) {
var prev, cur = null;

var bottom = Math.min(Math.max(0, axisy.min), axisy.max);
var top, lastX = 0;

var areaOpen = false;

for (var i = 0; i < data.length; ++i) {
prev = cur;
cur = data[i];

if (areaOpen && prev != null && cur == null) {
// close area
ctx.lineTo(axisx.p2c(lastX), axisy.p2c(bottom));
ctx.fill();
areaOpen = false;
continue;
}

if (prev == null || cur == null)
continue;

var x1 = prev[0], y1 = prev[1],
x2 = cur[0], y2 = cur[1];

// clip x values

// clip with xmin
if (x1 <= x2 && x1 < axisx.min) {
if (x2 < axisx.min)
continue;
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.min;
}
else if (x2 <= x1 && x2 < axisx.min) {
if (x1 < axisx.min)
continue;
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.min;
}

// clip with xmax
if (x1 >= x2 && x1 > axisx.max) {
if (x2 > axisx.max)
continue;
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.max;
}
else if (x2 >= x1 && x2 > axisx.max) {
if (x1 > axisx.max)
continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
}

if (!areaOpen) {
// open area
ctx.beginPath();
ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
areaOpen = true;
}

// now first check the case where both is outside
if (y1 >= axisy.max && y2 >= axisy.max) {
ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
continue;
}
else if (y1 <= axisy.min && y2 <= axisy.min) {
ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
continue;
}

// else it's a bit more complicated, there might
// be two rectangles and two triangles we need to fill
// in; to find these keep track of the current x values
var x1old = x1, x2old = x2;

// and clip the y values, without shortcutting

// clip with ymin
if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}

// clip with ymax
if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}

// if the x value was changed we got a rectangle
// to fill
if (x1 != x1old) {
if (y1 <= axisy.min)
top = axisy.min;
else
top = axisy.max;

ctx.lineTo(axisx.p2c(x1old), axisy.p2c(top));
ctx.lineTo(axisx.p2c(x1), axisy.p2c(top));
}

// fill the triangles
ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));

// fill the other rectangle if it's there
if (x2 != x2old) {
if (y2 <= axisy.min)
top = axisy.min;
else
top = axisy.max;

ctx.lineTo(axisx.p2c(x2old), axisy.p2c(top));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(top));
}

lastX = Math.max(x2, x2old);
}

if (areaOpen) {
ctx.lineTo(axisx.p2c(lastX), axisy.p2c(bottom));
ctx.fill();
}
}

ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineJoin = "round";

var lw = series.lines.lineWidth;
var sw = series.shadowSize;
// FIXME: consider another form of shadow when filling is turned on
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotLine(series.data, lw/2 + sw/2 + ctx.lineWidth/2, series.xaxis, series.yaxis);

ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotLine(series.data, lw/2 + ctx.lineWidth/2, series.xaxis, series.yaxis);
}

ctx.lineWidth = lw;
ctx.strokeStyle = series.color;
setFillStyle(series.lines, series.color);
if (series.lines.fill)
plotLineArea(series.data, series.xaxis, series.yaxis);
plotLine(series.data, 0, series.xaxis, series.yaxis);
ctx.restore();
}

function drawSeriesPoints(series) {
function plotPoints(data, radius, fill, axisx, axisy) {
for (var i = 0; i < data.length; ++i) {
if (data[i] == null)
continue;

var x = data[i][0], y = data[i][1];
if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
continue;

ctx.beginPath();
ctx.arc(axisx.p2c(x), axisy.p2c(y), radius, 0, 2 * Math.PI, true);
if (fill)
ctx.fill();
ctx.stroke();
}
}

function plotPointShadows(data, offset, radius, axisx, axisy) {
for (var i = 0; i < data.length; ++i) {
if (data[i] == null)
continue;

var x = data[i][0], y = data[i][1];
if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
continue;
ctx.beginPath();
ctx.arc(axisx.p2c(x), axisy.p2c(y) + offset, radius, 0, Math.PI, false);
ctx.stroke();
}
}

ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);

var lw = series.lines.lineWidth;
var sw = series.shadowSize;
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotPointShadows(series.data, sw/2 + ctx.lineWidth/2,
series.points.radius, series.xaxis, series.yaxis);

ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotPointShadows(series.data, ctx.lineWidth/2,
series.points.radius, series.xaxis, series.yaxis);
}

ctx.lineWidth = series.points.lineWidth;
ctx.strokeStyle = series.color;
setFillStyle(series.points, series.color);
plotPoints(series.data, series.points.radius, series.points.fill,
series.xaxis, series.yaxis);
ctx.restore();
}

function drawBar(x, y, barLeft, barRight, offset, fill, axisx, axisy, c) {
var drawLeft = true, drawRight = true,
drawTop = true, drawBottom = false,
left = x + barLeft, right = x + barRight,
bottom = 0, top = y;

// account for negative bars
if (top < bottom) {
top = 0;
bottom = y;
drawBottom = true;
drawTop = false;
}

// clip
if (right < axisx.min || left > axisx.max ||
top < axisy.min || bottom > axisy.max)
return;

if (left < axisx.min) {
left = axisx.min;
drawLeft = false;
}

if (right > axisx.max) {
right = axisx.max;
drawRight = false;
}

if (bottom < axisy.min) {
bottom = axisy.min;
drawBottom = false;
}

if (top > axisy.max) {
top = axisy.max;
drawTop = false;
}

// fill the bar
if (fill) {
c.beginPath();
c.moveTo(axisx.p2c(left), axisy.p2c(bottom) + offset);
c.lineTo(axisx.p2c(left), axisy.p2c(top) + offset);
c.lineTo(axisx.p2c(right), axisy.p2c(top) + offset);
c.lineTo(axisx.p2c(right), axisy.p2c(bottom) + offset);
c.fill();
}

// draw outline
if (drawLeft || drawRight || drawTop || drawBottom) {
c.beginPath();
left = axisx.p2c(left);
bottom = axisy.p2c(bottom);
right = axisx.p2c(right);
top = axisy.p2c(top);

c.moveTo(left, bottom + offset);
if (drawLeft)
c.lineTo(left, top + offset);
else
c.moveTo(left, top + offset);
if (drawTop)
c.lineTo(right, top + offset);
else
c.moveTo(right, top + offset);
if (drawRight)
c.lineTo(right, bottom + offset);
else
c.moveTo(right, bottom + offset);
if (drawBottom)
c.lineTo(left, bottom + offset);
else
c.moveTo(left, bottom + offset);
c.stroke();
}
}

function drawSeriesBars(series) {
function plotBars(data, barLeft, barRight, offset, fill, axisx, axisy) {
for (var i = 0; i < data.length; i++) {
if (data[i] == null)
continue;
drawBar(data[i][0], data[i][1], barLeft, barRight, offset, fill, axisx, axisy, ctx);
}
}

ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineJoin = "round";

// FIXME: figure out a way to add shadows
/*
var bw = series.bars.barWidth;
var lw = series.bars.lineWidth;
var sw = series.shadowSize;
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotBars(series.data, bw, lw/2 + sw/2 + ctx.lineWidth/2, false);

ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotBars(series.data, bw, lw/2 + ctx.lineWidth/2, false);
}*/

ctx.lineWidth = series.bars.lineWidth;
ctx.strokeStyle = series.color;
setFillStyle(series.bars, series.color);
var barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth/2;
plotBars(series.data, barLeft, barLeft + series.bars.barWidth, 0, series.bars.fill, series.xaxis, series.yaxis);
ctx.restore();
}

function setFillStyle(obj, seriesColor) {
var fill = obj.fill;
if (!fill)
return;

if (obj.fillColor)
ctx.fillStyle = obj.fillColor;
else {
var c = parseColor(seriesColor);
c.a = typeof fill == "number" ? fill : 0.4;
c.normalize();
ctx.fillStyle = c.toString();
}
}

function insertLegend() {
target.find(".legend").remove();

if (!options.legend.show)
return;

var fragments = [];
var rowStarted = false;
for (i = 0; i < series.length; ++i) {
if (!series[i].label)
continue;

if (i % options.legend.noColumns == 0) {
if (rowStarted)
fragments.push('</tr>');
fragments.push('<tr>');
rowStarted = true;
}

var label = series[i].label;
if (options.legend.labelFormatter != null)
label = options.legend.labelFormatter(label);

fragments.push(
'<td class="legendColorBox"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:14px;height:10px;background-color:' + series[i].color + ';overflow:hidden"></div></div></td>' +
'<td class="legendLabel">' + label + '</td>');
}
if (rowStarted)
fragments.push('</tr>');

if (fragments.length == 0)
return;

var table = '<table style="font-size:smaller;color:' + options.grid.color + '">' + fragments.join("") + '</table>';
if (options.legend.container != null)
options.legend.container.html(table);
else {
var pos = "";
var p = options.legend.position, m = options.legend.margin;
if (p.charAt(0) == "n")
pos += 'top:' + (m + plotOffset.top) + 'px;';
else if (p.charAt(0) == "s")
pos += 'bottom:' + (m + plotOffset.bottom) + 'px;';
if (p.charAt(1) == "e")
pos += 'right:' + (m + plotOffset.right) + 'px;';
else if (p.charAt(1) == "w")
pos += 'left:' + (m + plotOffset.left) + 'px;';
var legend = $('<div class="legend">' + table.replace('style="', 'style="position:absolute;' + pos +';') + '</div>').appendTo(target);
if (options.legend.backgroundOpacity != 0.0) {
// put in the transparent background
// separately to avoid blended labels and
// label boxes
var c = options.legend.backgroundColor;
if (c == null) {
var tmp;
if (options.grid.backgroundColor)
tmp = options.grid.backgroundColor;
else
tmp = extractColor(legend);
c = parseColor(tmp).adjust(null, null, null, 1).toString();
}
var div = legend.children();
$('<div style="position:absolute;width:' + div.width() + 'px;height:' + div.height() + 'px;' + pos +'background-color:' + c + ';"> </div>').prependTo(legend).css('opacity', options.legend.backgroundOpacity);

}
}
}

// interactive features

var lastMousePos = { pageX: null, pageY: null },
selection = {
first: { x: -1, y: -1}, second: { x: -1, y: -1},
show: false, active: false },
highlights = [],
clickIsMouseUp = false,
redrawTimeout = null,
hoverTimeout = null;

// Returns the data item the mouse is over, or null if none is found
function findNearbyItem(mouseX, mouseY) {
var maxDistance = options.grid.mouseActiveRadius,
lowestDistance = maxDistance * maxDistance + 1,
item = null, foundPoint = false;

function result(i, j) {
return { datapoint: series[i].data[j],
dataIndex: j,
series: series[i],
seriesIndex: i };
}

for (var i = 0; i < series.length; ++i) {
var data = series[i].data,
axisx = series[i].xaxis,
axisy = series[i].yaxis,

// precompute some stuff to make the loop faster
mx = axisx.c2p(mouseX),
my = axisy.c2p(mouseY),
maxx = maxDistance / axisx.scale,
maxy = maxDistance / axisy.scale,
checkbar = series[i].bars.show,
checkpoint = !(series[i].bars.show && !(series[i].lines.show || series[i].points.show)),
barLeft = series[i].bars.align == "left" ? 0 : -series[i].bars.barWidth/2,
barRight = barLeft + series[i].bars.barWidth;
for (var j = 0; j < data.length; ++j) {
if (data[j] == null)
continue;

var x = data[j][0], y = data[j][1];

if (checkbar) {
// For a bar graph, the cursor must be inside the bar
// and no other point can be nearby
if (!foundPoint && mx >= x + barLeft &&
mx <= x + barRight &&
my >= Math.min(0, y) && my <= Math.max(0, y))
item = result(i, j);
}

if (checkpoint) {
// For points and lines, the cursor must be within a
// certain distance to the data point

// check bounding box first
if ((x - mx > maxx || x - mx < -maxx) ||
(y - my > maxy || y - my < -maxy))
continue;

// We have to calculate distances in pixels, not in
// data units, because the scale of the axes may be different
var dx = Math.abs(axisx.p2c(x) - mouseX),
dy = Math.abs(axisy.p2c(y) - mouseY),
dist = dx * dx + dy * dy;
if (dist < lowestDistance) {
lowestDistance = dist;
foundPoint = true;
item = result(i, j);
}
}
}
}

return item;
}

function onMouseMove(ev) {
// FIXME: temp. work-around until jQuery bug 1871 is fixed
var e = ev || window.event;
if (e.pageX == null && e.clientX != null) {
var de = document.documentElement, b = document.body;
lastMousePos.pageX = e.clientX + (de && de.scrollLeft || b.scrollLeft || 0);
lastMousePos.pageY = e.clientY + (de && de.scrollTop || b.scrollTop || 0);
}
else {
lastMousePos.pageX = e.pageX;
lastMousePos.pageY = e.pageY;
}

if (options.grid.hoverable && !hoverTimeout)
hoverTimeout = setTimeout(onHover, 100);

if (selection.active)
updateSelection(lastMousePos);
}

function onMouseDown(e) {
if (e.which != 1) // only accept left-click
return;

// cancel out any text selections
document.body.focus();

// prevent text selection and drag in old-school browsers
if (document.onselectstart !== undefined && workarounds.onselectstart == null) {
workarounds.onselectstart = document.onselectstart;
document.onselectstart = function () { return false; };
}
if (document.ondrag !== undefined && workarounds.ondrag == null) {
workarounds.ondrag = document.ondrag;
document.ondrag = function () { return false; };
}

setSelectionPos(selection.first, e);

lastMousePos.pageX = null;
selection.active = true;
$(document).one("mouseup", onSelectionMouseUp);
}

function onClick(e) {
if (clickIsMouseUp) {
clickIsMouseUp = false;
return;
}

triggerClickHoverEvent("plotclick", e);
}

function onHover() {
triggerClickHoverEvent("plothover", lastMousePos);
hoverTimeout = null;
}

// trigger click or hover event (they send the same parameters
// so we share their code)
function triggerClickHoverEvent(eventname, event) {
var offset = eventHolder.offset(),
pos = { pageX: event.pageX, pageY: event.pageY },
canvasX = event.pageX - offset.left - plotOffset.left,
canvasY = event.pageY - offset.top - plotOffset.top;

if (axes.xaxis.used)
pos.x = axes.xaxis.c2p(canvasX);
if (axes.yaxis.used)
pos.y = axes.yaxis.c2p(canvasY);
if (axes.x2axis.used)
pos.x2 = axes.x2axis.c2p(canvasX);
if (axes.y2axis.used)
pos.y2 = axes.y2axis.c2p(canvasY);

var item = findNearbyItem(canvasX, canvasY);

if (item) {
// fill in mouse pos for any listeners out there
item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left);
item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top);


}

if (options.grid.autoHighlight) {
for (var i = 0; i < highlights.length; ++i) {
var h = highlights[i];
if (h.auto &&
!(item && h.series == item.series && h.point == item.datapoint))
unhighlight(h.series, h.point);
}

if (item)
highlight(item.series, item.datapoint, true);
}

target.trigger(eventname, [ pos, item ]);
}

function triggerRedrawOverlay() {
if (!redrawTimeout)
redrawTimeout = setTimeout(redrawOverlay, 50);
}

function redrawOverlay() {
redrawTimeout = null;

// redraw highlights
octx.save();
octx.clearRect(0, 0, canvasWidth, canvasHeight);
octx.translate(plotOffset.left, plotOffset.top);

var i, hi;
for (i = 0; i < highlights.length; ++i) {
hi = highlights[i];

if (hi.series.bars.show)
drawBarHighlight(hi.series, hi.point);
else
drawPointHighlight(hi.series, hi.point);
}
octx.restore();

// redraw selection
if (selection.show && selectionIsSane()) {
octx.strokeStyle = parseColor(options.selection.color).scale(null, null, null, 0.8).toString();
octx.lineWidth = 1;
ctx.lineJoin = "round";
octx.fillStyle = parseColor(options.selection.color).scale(null, null, null, 0.4).toString();

var x = Math.min(selection.first.x, selection.second.x),
y = Math.min(selection.first.y, selection.second.y),
w = Math.abs(selection.second.x - selection.first.x),
h = Math.abs(selection.second.y - selection.first.y);

octx.fillRect(x + plotOffset.left, y + plotOffset.top, w, h);
octx.strokeRect(x + plotOffset.left, y + plotOffset.top, w, h);
}
}

function highlight(s, point, auto) {
if (typeof s == "number")
s = series[s];

if (typeof point == "number")
point = s.data[point];

var i = indexOfHighlight(s, point);
if (i == -1) {
highlights.push({ series: s, point: point, auto: auto });

triggerRedrawOverlay();
}
else if (!auto)
highlights[i].auto = false;
}

function unhighlight(s, point) {
if (typeof s == "number")
s = series[s];

if (typeof point == "number")
point = s.data[point];

var i = indexOfHighlight(s, point);
if (i != -1) {
highlights.splice(i, 1);

triggerRedrawOverlay();
}
}

function indexOfHighlight(s, p) {
for (var i = 0; i < highlights.length; ++i) {
var h = highlights[i];
if (h.series == s && h.point[0] == p[0]
&& h.point[1] == p[1])
return i;
}
return -1;
}

function drawPointHighlight(series, point) {
var x = point[0], y = point[1],
axisx = series.xaxis, axisy = series.yaxis;

if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
return;

var pointRadius = series.points.radius + series.points.lineWidth / 2;
octx.lineWidth = pointRadius;
octx.strokeStyle = parseColor(series.color).scale(1, 1, 1, 0.5).toString();
var radius = 1.5 * pointRadius;
octx.beginPath();
octx.arc(axisx.p2c(x), axisy.p2c(y), radius, 0, 2 * Math.PI, true);
octx.stroke();
}

function drawBarHighlight(series, point) {
octx.lineJoin = "round";
octx.lineWidth = series.bars.lineWidth;
octx.strokeStyle = parseColor(series.color).scale(1, 1, 1, 0.5).toString();
octx.fillStyle = parseColor(series.color).scale(1, 1, 1, 0.5).toString();
var barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth/2;
drawBar(point[0], point[1], barLeft, barLeft + series.bars.barWidth,
0, true, series.xaxis, series.yaxis, octx);
}

function triggerSelectedEvent() {
var x1 = Math.min(selection.first.x, selection.second.x),
x2 = Math.max(selection.first.x, selection.second.x),
y1 = Math.max(selection.first.y, selection.second.y),
y2 = Math.min(selection.first.y, selection.second.y);

var r = {};
if (axes.xaxis.used)
r.xaxis = { from: axes.xaxis.c2p(x1), to: axes.xaxis.c2p(x2) };
if (axes.x2axis.used)
r.x2axis = { from: axes.x2axis.c2p(x1), to: axes.x2axis.c2p(x2) };
if (axes.yaxis.used)
r.yaxis = { from: axes.yaxis.c2p(y1), to: axes.yaxis.c2p(y2) };
if (axes.y2axis.used)
r.yaxis = { from: axes.y2axis.c2p(y1), to: axes.y2axis.c2p(y2) };

target.trigger("plotselected", [ r ]);

// backwards-compat stuff, to be removed in future
if (axes.xaxis.used && axes.yaxis.used)
target.trigger("selected", [ { x1: r.xaxis.from, y1: r.yaxis.from, x2: r.xaxis.to, y2: r.yaxis.to } ]);
}

function onSelectionMouseUp(e) {
// revert drag stuff for old-school browsers
if (document.onselectstart !== undefined)
document.onselectstart = workarounds.onselectstart;
if (document.ondrag !== undefined)
document.ondrag = workarounds.ondrag;

// no more draggy-dee-drag
selection.active = false;
updateSelection(e);

if (selectionIsSane()) {
triggerSelectedEvent();
clickIsMouseUp = true;
}

return false;
}

function setSelectionPos(pos, e) {
var offset = eventHolder.offset();
if (options.selection.mode == "y") {
if (pos == selection.first)
pos.x = 0;
else
pos.x = plotWidth;
}
else {
pos.x = e.pageX - offset.left - plotOffset.left;
pos.x = Math.min(Math.max(0, pos.x), plotWidth);
}

if (options.selection.mode == "x") {
if (pos == selection.first)
pos.y = 0;
else
pos.y = plotHeight;
}
else {
pos.y = e.pageY - offset.top - plotOffset.top;
pos.y = Math.min(Math.max(0, pos.y), plotHeight);
}
}

function updateSelection(pos) {
if (pos.pageX == null)
return;

setSelectionPos(selection.second, pos);
if (selectionIsSane()) {
selection.show = true;
triggerRedrawOverlay();
}
else
clearSelection();
}

function clearSelection() {
if (selection.show) {
selection.show = false;
triggerRedrawOverlay();
}
}

function setSelection(ranges, preventEvent) {
var range;

if (options.selection.mode == "y") {
selection.first.x = 0;
selection.second.x = plotWidth;
}
else {
range = extractRange(ranges, "x");

selection.first.x = range.axis.p2c(range.from);
selection.second.x = range.axis.p2c(range.to);
}

if (options.selection.mode == "x") {
selection.first.y = 0;
selection.second.y = plotHeight;
}
else {
range = extractRange(ranges, "y");

selection.first.y = range.axis.p2c(range.from);
selection.second.y = range.axis.p2c(range.to);
}

selection.show = true;
triggerRedrawOverlay();
if (!preventEvent)
triggerSelectedEvent();
}

function selectionIsSane() {
var minSize = 5;
return Math.abs(selection.second.x - selection.first.x) >= minSize &&
Math.abs(selection.second.y - selection.first.y) >= minSize;
}
}

$.plot = function(target, data, options) {
var plot = new Plot(target, data, options);
/*var t0 = new Date();
var t1 = new Date();
var tstr = "time used (msecs): " + (t1.getTime() - t0.getTime())
if (window.console)
console.log(tstr);
else
alert(tstr);*/
return plot;
};

// round to nearby lower multiple of base
function floorInBase(n, base) {
return base * Math.floor(n / base);
}

function clamp(min, value, max) {
if (value < min)
return value;
else if (value > max)
return max;
else
return value;
}

// color helpers, inspiration from the jquery color animation
// plugin by John Resig
function Color (r, g, b, a) {

var rgba = ['r','g','b','a'];
var x = 4; //rgba.length

while (-1<--x) {
this[rgba[x]] = arguments[x] || ((x==3) ? 1.0 : 0);
}

this.toString = function() {
if (this.a >= 1.0) {
return "rgb("+[this.r,this.g,this.b].join(",")+")";
} else {
return "rgba("+[this.r,this.g,this.b,this.a].join(",")+")";
}
};

this.scale = function(rf, gf, bf, af) {
x = 4; //rgba.length
while (-1<--x) {
if (arguments[x] != null)
this[rgba[x]] *= arguments[x];
}
return this.normalize();
};

this.adjust = function(rd, gd, bd, ad) {
x = 4; //rgba.length
while (-1<--x) {
if (arguments[x] != null)
this[rgba[x]] += arguments[x];
}
return this.normalize();
};

this.clone = function() {
return new Color(this.r, this.b, this.g, this.a);
};

var limit = function(val,minVal,maxVal) {
return Math.max(Math.min(val, maxVal), minVal);
};

this.normalize = function() {
this.r = limit(parseInt(this.r), 0, 255);
this.g = limit(parseInt(this.g), 0, 255);
this.b = limit(parseInt(this.b), 0, 255);
this.a = limit(this.a, 0, 1);
return this;
};

this.normalize();
}

var lookupColors = {
aqua:[0,255,255],
azure:[240,255,255],
beige:[245,245,220],
black:[0,0,0],
blue:[0,0,255],
brown:[165,42,42],
cyan:[0,255,255],
darkblue:[0,0,139],
darkcyan:[0,139,139],
darkgrey:[169,169,169],
darkgreen:[0,100,0],
darkkhaki:[189,183,107],
darkmagenta:[139,0,139],
darkolivegreen:[85,107,47],
darkorange:[255,140,0],
darkorchid:[153,50,204],
darkred:[139,0,0],
darksalmon:[233,150,122],
darkviolet:[148,0,211],
fuchsia:[255,0,255],
gold:[255,215,0],
green:[0,128,0],
indigo:[75,0,130],
khaki:[240,230,140],
lightblue:[173,216,230],
lightcyan:[224,255,255],
lightgreen:[144,238,144],
lightgrey:[211,211,211],
lightpink:[255,182,193],
lightyellow:[255,255,224],
lime:[0,255,0],
magenta:[255,0,255],
maroon:[128,0,0],
navy:[0,0,128],
olive:[128,128,0],
orange:[255,165,0],
pink:[255,192,203],
purple:[128,0,128],
violet:[128,0,128],
red:[255,0,0],
silver:[192,192,192],
white:[255,255,255],
yellow:[255,255,0]
};

function extractColor(element) {
var color, elem = element;
do {
color = elem.css("background-color").toLowerCase();
// keep going until we find an element that has color, or
// we hit the body
if (color != '' && color != 'transparent')
break;
elem = elem.parent();
} while (!$.nodeName(elem.get(0), "body"));

// catch Safari's way of signalling transparent
if (color == "rgba(0, 0, 0, 0)")
return "transparent";

return color;
}

// parse string, returns Color
function parseColor(str) {
var result;

// Look for rgb(num,num,num)
if (result = /rgb$\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*$/.exec(str))
return new Color(parseInt(result[1], 10), parseInt(result[2], 10), parseInt(result[3], 10));

// Look for rgba(num,num,num,num)
if (result = /rgba$\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*$/.exec(str))
return new Color(parseInt(result[1], 10), parseInt(result[2], 10), parseInt(result[3], 10), parseFloat(result[4]));

// Look for rgb(num%,num%,num%)
if (result = /rgb$\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*$/.exec(str))
return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55);

// Look for rgba(num%,num%,num%,num)
if (result = /rgba$\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*$/.exec(str))
return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55, parseFloat(result[4]));

// Look for #a0b1c2
if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))
return new Color(parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16));

// Look for #fff
if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))
return new Color(parseInt(result[1]+result[1], 16), parseInt(result[2]+result[2], 16), parseInt(result[3]+result[3], 16));

// Otherwise, we're most likely dealing with a named color
var name = $.trim(str).toLowerCase();
if (name == "transparent")
return new Color(255, 255, 255, 0);
else {
result = lookupColors[name];
return new Color(result[0], result[1], result[2]);
}
}

})(jQuery);

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