这次给大家带来怎样用canvas来绘制彩色七巧板,用canvas来绘制彩色七巧板的注意事项有哪些,下面就是实战案例,一起来看一下。
HTML代码
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"/> <title>Canvas绘制七巧板</title> </head> <body> <style> #canvas{ border: 1px solid #aaa; text-align: center;} </style> <canvas id="canvas" width="800" height="800"> 当用户浏览器不支持Canvas,请更换浏览器重试! </canvas> </body> </html>
js代码如下所示:
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: "#f9f51a"}, {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"} ];//七巧板的七块图形,p为各顶点坐标,color为颜色window.onload = function () { var canvas = document.getElementById("canvas"); if (canvas.getContext("2d")) {//判断浏览器是否支持canvas var context = canvas.getContext("2d"); 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 = 5; cxt.stroke(); } } else { alert("不支持canvas,请更换浏览器!") } };
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