<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<canvas id="canvas" width="1024" height="768" style="border:1px solid #aaa;display: block;margin: 50px auto;">
</canvas>
<script>
//點對象數組
var tangram = [
{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}], color:"#caff67"},
{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},
{p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},
{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51c"},
{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},
{p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},
{p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"}
]
window.onload = function(){ //js事件網頁加載好就執行
var canvas = document.getElementById("canvas");
canvas.width = 800;
canvas.height = 800;
var context = canvas.getContext("2d");
//使用context繪製
for(var i = 0; i < tangram.length; i++)
draw(tangram[i], context);
}
function draw(piece, cxt){
cxt.beginPath();
cxt.moveTo(piece.p[0].x,piece.p[0].y)
for(var i = 1; i < piece.p.length; i++)
cxt.lineTo(piece.p[i].x, piece.p[i].y);
cxt.closePath();
cxt.fillStyle = piece.color;
cxt.fill();
cxt.strokeStyle = "black";
cxt.lineWidth = 3;
cxt.stroke();
}
</script>
</body>
</html>
2.canvas畫七巧板
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