html5 canvas多个图像旋转
2015-04-13 16:38
344 查看
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>多个图像围绕中心点旋转</title> <script src="js/modernizr.js"></script> </head> <body> <script type="text/javascript"> window.addEventListener('load',eventWindowLoaded,false); function eventWindowLoaded(){ canvasApp(); } function canvasSupport(){ return Modernizr.canvas; } function canvasApp(){ if(!canvasSupport()){ return; }else{ var theCanvas = document.getElementById('canvas') var context = theCanvas.getContext("2d") } drawScreen(); function drawScreen(){ context.setTransform(1,0,0,1,0,0); var angleInRadians = 45 * Math.PI / 180; var x = 50; var y = 100; var width = 40; var height = 40; context.translate(x+.5*width,y+.5*height); context.rotate(angleInRadians); context.fillStyle="red"; context.fillRect(-.5*width,-.5*height,width,height); context.setTransform(1,0,0,1,0,0); var angleInRadians = 75 * Math.PI / 180; var x = 100; var y = 100; var width = 40; var height = 40; context.translate(x+.5*width,y+.5*height); context.rotate(angleInRadians); context.fillStyle="red"; context.fillRect(-.5*width,-.5*height,width,height); context.setTransform(1,0,0,1,0,0); var angleInRadians = 90 * Math.PI / 180; var x = 150; var y = 100; var width = 40; var height = 40; context.translate(x+.5*width,y+.5*height); context.rotate(angleInRadians); context.fillStyle="red"; context.fillRect(-.5*width,-.5*height,width,height); context.setTransform(1,0,0,1,0,0); var angleInRadians = 120 * Math.PI / 180; var x = 200; var y = 100; var width = 40; var height = 40; context.translate(x+.5*width,y+.5*height); context.rotate(angleInRadians); context.fillStyle="red"; context.fillRect(-.5*width,-.5*height,width,height); } } </script> <canvas id="canvas" width="500" height="500"> 你的浏览器无法使用canvas 小白童鞋;你的支持是我最大的快乐!! </canvas> </body> </html>
相关文章推荐
- html5学习笔记三:canvas中平移,缩放,旋转等图像变换问题
- html5 canvas画不出图像的原因
- 使用HTML5中的canvas绘制灰太狼图像
- html5 canvas 绘制图像、画布或视频
- HTML5 Canvas平移,放缩,旋转演示
- 在canvas里绘制多个图像并且旋转图像
- HTML5 Canvas图像缩放
- 跟KingDZ学HTML5之七 探究Canvas之各种特效---移动、旋转、缩放
- canvas图像裁剪、压缩、旋转
- HTML5 Canvas 图像动画的实现
- html5 canvas 标签绘制图像且渐变色处理
- html5进阶之canvas图像基础
- canvas 图像旋转与翻转姿势解锁
- html5 canvas旋转+缩放
- HTML5 Canvas 小例子 旋转的时钟
- html5 canvas围绕中心点旋转
- 【开源】canvas图像裁剪、压缩、旋转
- HTML5中canvas知识点详解7-使用图像
- HTML5 Canvas 旋转
- Html5 canvas学习5-图形变形:缩放 旋转 平移 变形