如何用canvas来绘制彩色七巧板-
发布时间:08/01 来源:未知 浏览:
关键词:
HTML代码
Canvas绘制七巧板
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为色彩window.onload = function () { var canvas = document.getElementById("canvas"); if (canvas.getContext("2d")) {//推断阅读器可否支撑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!") } };
怎么运用select猎取选择的值
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