HTML5画:线、圆、矩形、渐变

示例一:矩形

HTML5画:线、圆、矩形、渐变

<!DOCTYPE html><head> 

<meta charset=utf-8> 

<title>HTML5画线、圆、矩形</title>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

</head> 

<script>

$(document).ready(function(){

var c=document.getElementById("drawbox");

var draw=c.getContext("2d");        //获取2d内容的引用,调用绘图API

draw.fillStyle="#ff0000";            //方式一指定填充颜色

draw.fillRect(0,0,300,100);            //坐标和长宽

draw.fillStyle="rgba(0,0,255,0.5)";    //方式二rgb+透明度

draw.fillRect(400,0,100,100);        //坐标和长宽

})

</script>

</body>

<canvas id="drawbox" width="500" height="500"></canvas>

</body> 

</html> 

示例二:线

<!DOCTYPE html><head> 

<meta charset=utf-8> 

<title>HTML5画线、圆、矩形</title>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

</head> 

<script>

$(document).ready(function(){

var c=document.getElementById("drawbox");

var draw=c.getContext("2d");        //获取2d内容的引用,调用绘图API


draw.strokeStyle="#000000";  //指定绘图线颜色 draw.moveTo(10,10); //起始位置 draw.lineTo(150,10); //终止位置 draw.lineTo(10,50); //结束前继续之前的结束点连接 draw.lineTo(10,50);
draw.lineTo(10,10); draw.stroke();
//结束 }) </script> </body> <canvas id="drawbox" width="500" height="500"></canvas> </body> </html>

 示例三:圆

HTML5画:线、圆、矩形、渐变

 

<!DOCTYPE html><head> 

<meta charset=utf-8> 

<title>HTML5画线、圆、矩形</title>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

</head> 

<script>

$(document).ready(function(){

var c=document.getElementById("drawbox");

var draw=c.getContext("2d");            //获取2d内容的引用,调用绘图API



draw.fillStyle="red";                    //颜色

draw.beginPath();                        //从新画

draw.arc(50,50,50,0,Math.PI*2,true);     //圆心x坐标|圆心y坐标|直径|始|PI为圆周率,Math.PI*2为画圆|true为时针方向:逆时针,0为顺时针,

draw.closePath();                        //结束

draw.fill();

})

</script>

</body>

<canvas id="drawbox" width="500" height="500"></canvas>

</body> 

</html> 

示例四:渐变

<!DOCTYPE html><head> 

<meta charset=utf-8> 

<title>HTML5画线、圆、矩形</title>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

</head> 

<script>

$(document).ready(function(){

var c=document.getElementById("drawbox");

var draw=c.getContext("2d");        //获取2d内容的引用,调用绘图API



//指定渐变区块

var grd=draw.createLinearGradient(50,50,200,50); //坐标,长宽

grd.addColorStop(0,"black");  //起点颜色

grd.addColorStop(1,"green");        //终点颜色



draw.fillStyle=grd;                //设为填充样式

draw.fillRect(50,50,200,50);    //填充进矩形内

})

</script>

</body>

<canvas id="drawbox" width="500" height="500"></canvas>

</body> 

</html>

 同理所得~~自己尝试下吧

HTML5画:线、圆、矩形、渐变

 实例:制作简单面板

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