情人节炫酷表白神器

来源：互联网发布：淘宝男士内裤哪个好编辑：程序博客网时间：2024/05/01 13:27

<!DOCTYPE html PUBLIC "-//W3C//DTDXHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<htmlxmlns="http://www.w3.org/1999/xhtml">

<head>

<metahttp-equiv="Content-Type" content="text/html;charset=utf-8" />

<title>HTML5粒子效果动画演示</title>

</head>

<body>

<scripttype="text/javascript">

BLUR = false;

PULSATION = true;

PULSATION_PERIOD = 600;

PARTICLE_RADIUS = 4;

BLINK = false;

GLOBAL_PULSATION = false;

QUALITY = 2;

ARC = true;

TREMBLING = 0;

FANCY_FONT = "Arial";

BACKGROUND = "#000";

BLENDING = true;

var TEXT;

num = 0;

TEXTArray = ["你说","你喜", "欢的", "是谁"];

QUALITY_TO_FONT_SIZE = [10, 12, 40, 50,100, 350];

QUALITY_TO_SCALE = [20, 6, 4, 2, 0.9, 0.5];

QUALITY_TO_TEXT_POS = [10, 20, 60, 100,370, 280];

window.onload = function () {

document.body.style.backgroundColor = BACKGROUND;

var canvas = document.getElementById("canvas");

var ctx = canvas.getContext("2d");

var W = canvas.width;

var H = canvas.height;

var tcanvas = document.createElement("canvas");

var tctx = tcanvas.getContext("2d");

tcanvas.width = W;

tcanvas.height = H;

total_area = W * H;

total_particles = 928;

single_particle_area = total_area / total_particles;

area_length = Math.sqrt(single_particle_area);

var particles = [];

for (var i = 1; i <= total_particles; i++) {

particles.push(newparticle(i));

}

function particle(i) {

this.r =Math.round(Math.random() * 255 | 0);

this.g =Math.round(Math.random() * 255 | 0);

this.b =Math.round(Math.random() * 255 | 0);

this.alpha = 1;

this.x = (i * area_length) % W;

this.y = (i * area_length) / W* area_length;

this.deltaOffset =Math.random() * PULSATION_PERIOD | 0;

this.radius = 0.1 +Math.random() * 2;

}

var positions = [];

function new_positions() {

TEXT = TEXTArray[num];

if (num < TEXTArray.length -1) {

num++;

} else {

num = 0;

}

//alert(TEXT);

tctx.fillStyle ="white";

tctx.fillRect(0, 0, W, H)

//tctx.fill();

tctx.font = "bold " +QUALITY_TO_FONT_SIZE[QUALITY] + "px " + FANCY_FONT;

//tctx.textAlign='center';//文本水平对齐方式

//tctx.textBaseline='middle';

//tctx.strokeStyle ="black";

tctx.fillStyle ="#f00";

//tctx.strokeText(TEXT,30, 50);

tctx.fillText(TEXT, 20, 60);

image_data =tctx.getImageData(0, 0, W, H);

pixels = image_data.data;

positions = [];

for (var i = 0; i <pixels.length; i = i + 2) {

if (pixels[i] != 255) {

position = {

x: (i /2 % W | 0) * QUALITY_TO_SCALE[QUALITY] | 0,

y: (i /2 / W | 0) * QUALITY_TO_SCALE[QUALITY] | 0

}

positions.push(position);

}

get_destinations();

}

function draw() {

var now = Date.now();

ctx.globalCompositeOperation ="source-over";

if (BLUR) ctx.globalAlpha =0.1;

else if (!BLUR &&!BLINK) ctx.globalAlpha = 1.0;

ctx.fillStyle = BACKGROUND;

ctx.fillRect(0, 0, W, H)

if (BLENDING)ctx.globalCompositeOperation = "lighter";

for (var i = 0; i <particles.length; i++) {

p = particles[i];

if (isNaN(p.x))continue

ctx.beginPath();

ctx.fillStyle ="rgb(" + p.r + ", " + p.g + ", " + p.b +")";

ctx.fillStyle ="rgba(" + p.r + ", " + p.g + ", " + p.b + "," + p.alpha + ")";

if (BLINK)ctx.globalAlpha = Math.sin(Math.PI * mod * 1.0);

if (PULSATION) {

var mod =((GLOBAL_PULSATION ? 0 : p.deltaOffset) + now) % PULSATION_PERIOD /PULSATION_PERIOD;

mod =Math.sin(mod * Math.PI);

} else var mod = 1;

var offset = TREMBLING? TREMBLING * (-1 + Math.random() * 2) : 0;

var radius =PARTICLE_RADIUS * p.radius;

if (!ARC) {

ctx.fillRect(offset + p.x - mod * radius / 2 | 0, offset + p.y - mod *radius / 2 | 0, radius * mod,

radius * mod);

} else {

ctx.arc(offset+ p.x | 0, offset + p.y | 0, radius * mod, Math.PI * 2, false);

ctx.fill();

}

p.x += (p.dx - p.x) /10;

p.y += (p.dy - p.y) /10;

}

function get_destinations() {

for (var i = 0; i <particles.length; i++) {

pa = particles[i];

particles[i].alpha = 1;

var distance = [];

nearest_position = 0;

if (positions.length) {

for (var n = 0;n < positions.length; n++) {

po =positions[n];

distance[n] = Math.sqrt((pa.x - po.x) * (pa.x - po.x) + (pa.y - po.y) *(pa.y - po.y));

if (n> 0) {

if (distance[n] <= distance[nearest_position]) {

nearest_position = n;

}

particles[i].dx= positions[nearest_position].x;

particles[i].dy= positions[nearest_position].y;

particles[i].distance= distance[nearest_position];

var po1 =positions[nearest_position];

for (var n = 0;n < positions.length; n++) {

var po2= positions[n];

distance = Math.sqrt((po1.x - po2.x) * (po1.x - po2.x) + (po1.y - po2.y)* (po1.y - po2.y));

if(distance <= 5) {

positions.splice(n, 1);

}

} else {

//particles[i].alpha = 0;

}

function init() {

new_positions();

setInterval(draw, 30);

setInterval(new_positions,2000);

}

init();

};

</script>

body {

background: #000;

text-align: center;

font-family: "simhei"

}

canvas {

margin: auto;

position: absolute;

left: 0;

right:0;

top: 0;

bottom: 0;

}

</style>

</body>

</html>

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