Html5 Canvas 系列_绘图一

来源：互联网发布：windows文件名最大长度编辑：程序博客网时间：2024/05/22 00:42
<!DOCTYPE HTML><html> <head>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>  <title> Canvas 绘图</title>  <meta name="Generator" content="EditPlus">  <meta name="Author" content="cloud">  <meta name="Keywords" content="H5 Canvas 绘图">  <meta name="Description" content="使用Html5 Canvas 绘制图形"> </head><style type="text/css">#canvas{border: 1px solid #000;display:block;margin: 50px auto;}</style> <body><canvas id="canvas">您的浏览器不支持Canvas</canvas> </body><script type="text/javascript" src="http://www.w3school.com.cn/jquery/jquery.js"></script><script type="text/javascript">// 初始化Canvasfunction init_canvas(canvas_id){var canvas = document.getElementById("canvas");canvas.width = 800;canvas.height = 800;return canvas.getContext("2d");}//绘制线条公用方法//contextCanvas容器x y 起点line_array 线条数组line_width 线条精细stroke_style 填充颜色//line_width line_width 为空即用默认值function pub_ph(context, x_y, line_array, line_width, stroke_style){context.moveTo(x_y[0], x_y[1]);//循环绘制线条$.each(line_array, function(i, v){       　　//在第一次循环中，this代表一个一维数组，将这个一维数组再次送到each函数中，遍历里面的一维函数context.lineTo(v[0], v[1]);  });//设置填充颜色if(stroke_style != null)context.strokeStyle = stroke_style;//设置线条颜色if(line_width != null)context.lineWidth = line_width;context.stroke();}//|\//----  \//----| ///|/function ph1(context){var line_array = [[100, 350], [500, 350], [500, 350] , [500, 200], [700, 400], [500, 600], [500, 450], [100, 450]];pub_ph(context, [[100, 350]], line_array, 20, "#582");}//\ \ \ /// //function ph2(context){context.beginPath();context.moveTo(100, 200);context.lineTo(300, 400);context.lineTo(100, 600);context.strokeStyle = "red";context.stroke();context.beginPath();context.moveTo(300, 200);context.lineTo(500, 400);context.lineTo(300, 600);context.strokeStyle = "green";context.stroke();context.beginPath();context.moveTo(500, 200);context.lineTo(700, 400);context.lineTo(500, 600);context.strokeStyle = "blue";context.stroke();}//|\//|---  \//|---| ///|/function ph3(context){context.moveTo(100, 350);context.lineTo(500, 350);context.lineTo(500, 350);context.lineTo(500, 200);context.lineTo(700, 400);context.lineTo(500, 600);context.lineTo(500, 450);context.lineTo(100, 450);context.lineTo(100, 350);context.closePath();context.lineWidth = "10";context.strokeStyle = "#c00";context.fillStyle = "#ff0"//Canvas 基于状态绘制，设置完绘制属性进行绘制操作context.fill();context.stroke();}//   _____//  |  |//  |_____|//function ph4(context){context.lineWidth = 5;context.fillStyle = "#00f";context.strokeStyle = "#f3c";context.fillRect(200, 200, 400, 400);context.strokeRect(200, 200, 400, 400);}//五角星function ph5(context){context.beginPath();for(var i = 0; i < 5; i++){var x = Math.cos((18 + i * 72 - 30) / 180 * Math.PI) * 300 + 400;var y = -Math.sin((18 + i * 72 - 30) / 180 * Math.PI) * 300 + 400;context.lineTo(x, y);x = Math.cos((54 + i * 72 - 30) / 180 * Math.PI) * 150 + 400;y = -Math.sin((54 + i * 72 -30) / 180 * Math.PI) * 150 + 400;context.lineTo(x, y);}context.closePath();context.strokeStyle = "#f00";context.fillStyle = "#f00";context.lineWidth = 10;context.fill();context.stroke();}$(function(){var context = init_canvas("canvas");ph5(context);});</script></html>
最近在学习Html5 ，从最基础的 Canvas 绘图开始学习，分享一下二天下来的成果，效果图：
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