canvas简易绘图的实现（海绵宝宝篇）
最近在研究canvas，简单的用canvas绘制了一下卡通人物--海绵宝宝。
图片如下：
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>canvas海绵宝宝</title>
</head>
<body>
<canvas id="canvas" width="1000" height="700" style="background: #01539f;"></canvas>
</body>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
with(ctx){
//袖子
//左
beginPath();
fillStyle="#fff";
strokeStyle="#000";
lineWidth=2;
bezierCurveTo(142,253,112,263,112,303)
quadraticCurveTo(120,308,150,303)
fill();
stroke();
closePath();
//右
beginPath();
fillStyle="#fff";
strokeStyle="#000";
lineWidth=2;
bezierCurveTo(445,253,477,263,477,303)
quadraticCurveTo(467,308,447,303)
fill();
stroke();
closePath();
//胳膊
//左
beginPath();
fillStyle="#f5e261";
strokeStyle="#000";
lineWidth=2;
moveTo(122,306);
lineTo(110,406);
lineTo(120,406);
lineTo(132,306);
fill();
stroke();
closePath();
//右
beginPath();
fillStyle="#f5e261";
strokeStyle="#000";
moveTo(458,306);
lineTo(470,406);
lineTo(480,406);
lineTo(468,306);
fill();
stroke();
closePath();
//手
//左
//衣服
beginPath();
fillStyle="#fff";
strokeStyle="#000";
lineWidth=5;
shadowColor = "#000";
shadowOffsetX = 0;
shadowOffsetY = 0;
shadowBlur = 0;
moveTo(145,385);
lineTo(146,425);
lineTo(442,425);
lineTo(443,385);
stroke();
fill();
closePath();
//裤子
beginPath();
fillStyle="#ae6f28";
strokeStyle="#000";
moveTo(146,427);
lineTo(147,470);
lineTo(441,470);
lineTo(442,427);
stroke();
fill();
closePath();
//裤子图案
beginPath();
fillStyle="#000";
rect(156,438,60,15);
rect(236,438,120,15);
rect(373,438,60,15);
fill();
closePath();
//裤腿
beginPath();
fillStyle="#ae6f28";
strokeStyle="#000";
lineWidth=2;
moveTo(190,472);
lineTo(190,490);
lineTo(235,490);
lineTo(235,472);
moveTo(350,472);
lineTo(350,490);
lineTo(395,490);
lineTo(395,472);
fill();
stroke();
closePath();
//腿
beginPath();
fillStyle="#fffe71";
strokeStyle="#000";
lineWidth=2;
moveTo(208,491);
lineTo(208,516);
lineTo(218,516);
lineTo(218,491);
moveTo(368,491);
lineTo(368,516);
lineTo(378,516);
lineTo(378,491);
fill();
stroke();
closePath();
//袜子
beginPath();
fillStyle="#fff";
strokeStyle="#000";
lineWidth=2;
moveTo(208,517);
lineTo(207,560);
lineTo(218,560);
lineTo(218,517);
moveTo(368,517);
lineTo(368,560);
lineTo(379,560);
lineTo(378,517);
fill();
stroke();
closePath();
//蓝杠
beginPath();
strokeStyle="#536d92";
lineWidth=4;
moveTo(208,523);
lineTo(218,523);
moveTo(368,523);
lineTo(378,523);
stroke();
closePath();
//红杠
beginPath();
strokeStyle="#da4751";
lineWidth=4;
moveTo(209,530);
lineTo(218,530);
moveTo(369,530);
lineTo(378,530);
stroke();
closePath();
//领带
beginPath();
strokeStyle="#000";
lineWidth=5;
fillStyle="#ef4641";
moveTo(270,385);
lineTo(320,385);
lineTo(298,413);
lineTo(292,413);
lineTo(270,385);
moveTo(292,415);
lineTo(280,446);
lineTo(295,462);
lineTo(310,446);
lineTo(298,415);
stroke();
fill();
closePath();
//领子
beginPath();
strokeStyle="#000";
fillStyle="#fff";
moveTo(280,393);
lineTo(265,410);
lineTo(218,385);
moveTo(310,393);
lineTo(325,410);
lineTo(362,385);
stroke();
fill();
closePath();
//脸
beginPath();
strokeStyle="#818620";
fillStyle="#f5e262";
lineWidth=5;
bezierCurveTo(140,50,150,60,160,50);
quadraticCurveTo(170,40,180,50);
quadraticCurveTo(190,60,200,50);
quadraticCurveTo(210,40,220,50);
quadraticCurveTo(230,60,240,50);
quadraticCurveTo(250,40,260,50);
quadraticCurveTo(270,60,280,50);
quadraticCurveTo(290,40,300,50);
quadraticCurveTo(310,60,320,50);
quadraticCurveTo(330,40,340,50);
quadraticCurveTo(350,60,360,50);
quadraticCurveTo(370,40,380,50);
quadraticCurveTo(390,60,400,50);
quadraticCurveTo(410,40,420,50);
quadraticCurveTo(430,60,440,50);
quadraticCurveTo(450,40,460,50);
quadraticCurveTo(465,60,460,70);
quadraticCurveTo(450,80,460,90);
quadraticCurveTo(468,100,458,110);
quadraticCurveTo(446,120,456,130);
quadraticCurveTo(466,140,456,150);
quadraticCurveTo(444,160,454,170);
quadraticCurveTo(464,180,454,190);
quadraticCurveTo(442,200,452,210);
quadraticCurveTo(462,220,452,230);
quadraticCurveTo(440,240,450,250);
quadraticCurveTo(460,260,450,270);
quadraticCurveTo(438,280,448,290);
quadraticCurveTo(458,300,448,310);
quadraticCurveTo(436,320,446,330);
quadraticCurveTo(456,340,446,350);
quadraticCurveTo(434,360,444,370);
quadraticCurveTo(454,380,444,390);
quadraticCurveTo(435,405,424,390);
quadraticCurveTo(415,380,405,390);
quadraticCurveTo(395,400,385,390);
quadraticCurveTo(375,380,365,390);
quadraticCurveTo(355,400,345,390);
quadraticCurveTo(335,380,325,390);
quadraticCurveTo(315,400,305,390);
quadraticCurveTo(295,380,285,390);
quadraticCurveTo(275,400,265,390);
quadraticCurveTo(255,380,245,390);
quadraticCurveTo(235,400,225,390);
quadraticCurveTo(215,380,205,390);
quadraticCurveTo(195,400,185,390);
quadraticCurveTo(175,380,165,390);
quadraticCurveTo(155,400,145,390);
quadraticCurveTo(135,380,145,370);
quadraticCurveTo(153,360,143,350);
quadraticCurveTo(133,340,143,330);
quadraticCurveTo(151,320,141,310);
quadraticCurveTo(131,300,141,290);
quadraticCurveTo(149,280,139,270);
quadraticCurveTo(129,260,139,250);
quadraticCurveTo(147,240,137,230);
quadraticCurveTo(127,220,137,210);
quadraticCurveTo(145,200,135,190);
quadraticCurveTo(125,180,135,170);
quadraticCurveTo(143,160,133,150);
quadraticCurveTo(123,140,133,130);
quadraticCurveTo(141,120,131,110);
quadraticCurveTo(121,100,131,90);
quadraticCurveTo(139,80,129,70);
quadraticCurveTo(119,60,129,50);
quadraticCurveTo(137,45,140,50);
stroke();
fill();
closePath();
//眼睛
beginPath();
strokeStyle="#000";
fillStyle="#fff";
arc(249,180,45,0,Math.PI*2,true);
arc(341,180,45,0,Math.PI*2,true);
stroke();
fill();
closePath();
//眼仁
beginPath();
strokeStyle="#000";
fillStyle="#50d1f1";
arc(255,180,18,0,Math.PI*2,true);
stroke();
fill();
closePath();
beginPath();
strokeStyle="#000";
fillStyle="#50d1f1";
arc(335,180,18,0,Math.PI*2,true);
stroke();
fill();
closePath();
//眼球
beginPath();
strokeStyle="#000";
fillStyle="#000";
arc(255,180,10,0,Math.PI*2,true);
stroke();
fill();
closePath();
beginPath();
strokeStyle="#000";
fillStyle="#000";
arc(335,180,10,0,Math.PI*2,true);
stroke();
fill();
closePath();
//眼睫毛
beginPath();
lineWidth=6;
strokeStyle="#000";
moveTo(210,122);
lineTo(223,142);
moveTo(247,112);
lineTo(247,133);
moveTo(283,117);
lineTo(270,140);
moveTo(307,120);
lineTo(320,140);
moveTo(344,112);
lineTo(344,133);
moveTo(380,120);
lineTo(365,140);
stroke();
closePath();
//嘴角
beginPath();
fillStyle="#fdd06b"
lineWidth=3;
strokeStyle="#ca5939";
moveTo(190,230);
bezierCurveTo(160,175,265,190,230,230);
stroke();
fill();
closePath();
beginPath();
fillStyle="#fdd06b"
lineWidth=3;
strokeStyle="#ca5939";
moveTo(350,230);
bezierCurveTo(325,175,435,190,395,230);
stroke();
fill();
closePath();
//牙
beginPath();
strokeStyle="#000";
lineWidth=2;
fillStyle="#fff";
moveTo(275,272);
lineTo(275,292);
lineTo(295,292);
lineTo(295,272);
moveTo(300,272);
lineTo(300,292);
lineTo(320,292);
lineTo(320,271);
//rect(297,252,20,20);
fill();
stroke();
closePath();
//嘴
beginPath();
strokeStyle="#000";
lineWidth=3;
bezierCurveTo(210,220,290,340,380,220);
stroke();
closePath();
beginPath();
strokeStyle="#000";
lineWidth=2;
bezierCurveTo(205,225,205,215,220,220);
stroke();
closePath();
beginPath();
strokeStyle="#000";
lineWidth=2;
bezierCurveTo(370,220,380,215,385,225);
stroke();
closePath();
//鼻子
beginPath();
strokeStyle="#000";
lineWidth=3;
fillStyle="#f5e262";
moveTo(290,215);
bezierCurveTo(265,170,340,185,300,225);
stroke();
fill();
closePath();
//下巴
beginPath();
strokeStyle="#cb662e";
lineWidth=2;
bezierCurveTo(250,305,270,330,290,310);
quadraticCurveTo(300,305,310,310);
quadraticCurveTo(330,330,350,305);
shadowColor = "#cb662e";
shadowOffsetX = 0;
shadowOffsetY = -3;
shadowBlur = 10;
stroke();
closePath();
//雀斑
beginPath();
fillStyle="#bf7627";
arc(197,205,2,0,Math.PI*2,true);
fill();
closePath();
beginPath();
fillStyle="#bf7627";
arc(210,214,2,0,Math.PI*2,true);
fill();
closePath();
beginPath();
fillStyle="#bf7627";
arc(218,207,2,0,Math.PI*2,true);
fill();
closePath();
beginPath();
fillStyle="#bf7627";
arc(367,205,2,0,Math.PI*2,true);
fill();
closePath();
beginPath();
fillStyle="#bf7627";
arc(390,206,2,0,Math.PI*2,true);
fill();
closePath();
beginPath();
fillStyle="#bf7627";
arc(380,213,2,0,Math.PI*2,true);
fill();
closePath();
//皮鞋
//左
beginPath();
strokeStyle="#000";
fillStyle="#000";
lineWidth=4;
shadowColor = "#000";
shadowOffsetX = 0;
shadowOffsetY = 0;
shadowBlur = 0;
arc(180,577,11,0,Math.PI*2,true);
bezierCurveTo(185,560,197,575,207,560);
moveTo(207,560);
lineTo(217,560);
quadraticCurveTo(227,570,217,585);
quadraticCurveTo(197,580,180,585);
quadraticCurveTo(207,561,185,570);
rect(207,585,10,4)
stroke();
fill();
//ctx.rotate( m * Math.PI / 180)
closePath();
//右
beginPath();
strokeStyle="#000";
fillStyle="#000";
lineWidth=4;
shadowColor = "#000";
shadowOffsetX = 0;
shadowOffsetY = 0;
shadowBlur = 0;
arc(405,577,11,0,Math.PI*2,true);
bezierCurveTo(400,560,388,575,378,560);
moveTo(378,560);
lineTo(368,560);
quadraticCurveTo(358,570,368,585);
quadraticCurveTo(388,580,405,585);
quadraticCurveTo(422,561,400,570);
rect(368,585,10,4)
stroke();
fill();
//ctx.rotate( m * Math.PI / 180)
closePath();
//白点
beginPath();
strokeStyle="#f5e262";
fillStyle="#c4b127";
fill();
EvenCompEllipse(ctx, 160, 100, 10, 15);
EvenCompEllipse(ctx, 150, 150, 5, 7);
EvenCompEllipse(ctx, 200, 320, 7, 10)
EvenCompEllipse(ctx, 225, 350, 11, 16)
EvenCompEllipse(ctx, 425, 120, 11, 16)
EvenCompEllipse(ctx, 410, 320, 9, 12)
EvenCompEllipse(ctx, 380, 340, 6, 9)
closePath();
}
function EvenCompEllipse(ctx, x, y, a, b)
{
ctx.save();
//选择a、b中的较大者作为arc方法的半径参数
var r = (a > b) ? a : b;
var ratioX = a / r; //横轴缩放比率
var ratioY = b / r; //纵轴缩放比率
ctx.scale(ratioX, ratioY); //进行缩放（均匀压缩）
ctx.beginPath();
//从椭圆的左端点开始逆时针绘制
ctx.moveTo((x + a) / ratioX, y / ratioY);
ctx.arc(x / ratioX, y / ratioY, r, 0, 2 * Math.PI);
ctx.closePath();
ctx.stroke();
ctx.fill();
ctx.restore();
};
</script>
</html>
