JavaScript+html5 canvas绘制小人的效果介绍

web前端|js教程

JavaScript,html5,canvas,绘制

web前端-js教程运行效果截图如下：

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index.html代码如下：

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#canvas { background:black; margin-top:100px; margin-left:200px; } cache = {}; var offsetX = 50, offsetY = 20; cache.context = dyl.createContext(canvas); dyl.rect(dyl.createColor(), 60 + offsetX, 0 + offsetY, 185, 100); dyl.rect(dyl.createColor(), 100 + offsetX, 100 + offsetY, 100, 50); dyl.rect(dyl.createColor(), 20 + offsetX, 150 + offsetY, 260, 200); dyl.rect(dyl.createColor(), 80 + offsetX, 350 + offsetY, 30, 110); dyl.rect(dyl.createColor(), 190 + offsetX, 350 + offsetY, 30, 110); dyl.circle(dyl.createColor(), 115 + offsetX, 55, 20); dyl.circle(dyl.createColor(), 190 + offsetX, 55, 20);

canvas.js代码如下：

(function() { var dyl = {cache: {}}; dyl.setContext = function(context) { dyl.cache._context = context; return context; } dyl.getDom = function(id) { return document.getElementById(id); } dyl._getContext = function() { return dyl.cache._context; } dyl.save = function() { var context = dyl._getContext(); context ? context.save() : void(0); } dyl.restore = function() { var context = dyl._getContext(); context ? context.restore() : void(0); } dyl.createContext = function(canvasID) { var canvas = this.getDom(canvasID); if(!canvas) {return null; } return dyl.setContext(canvas.getContext("2d")); } dyl.createColor = function() { var color = "rgb("; color += Math.round(Math.random()*255); color += ","; color += Math.round(Math.random()*255); color += ","; color += Math.round(Math.random()*255); color += ")"; return color; }; dyl.addImg = function(img, x, y) { var context = dyl._getContext(); if(!img || !context) {return; } if(typeof img === "string") {var oImg = new Image();oImg.src = img;oImg.onload = function() { context.drawImage(oImg, x, y);}return; }context.drawImage(img, x, y); }; dyl.rect = function(color, x, y, width, height) { var context = dyl._getContext(); if(!context) {return; } context.fillStyle = color; context.fillRect(x, y, width, height); }; dyl.circle = function(color, x, y, r) { var context = dyl._getContext(); context.save(); context.fillStyle = color; context.beginPath(); context.arc(x, y, r, 0, 2*Math.PI); context.fill(); context.stroke(); }; dyl.scale = function(x, y) { var context = dyl._getContext(); if(!context) {return; } x = x ? x : 1; y = y ? y : 1; context.scale(x, y); }; if(!window.dyl) { window.dyl = dyl; }})();