標籤：UI 起點 onload html tco canvas load 表示 旋轉
效果如下：
代碼如下：
<!DOCTYPE html><html lang="utf-8"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><head> <title>旋轉45度佛教萬字</title> </head> <body onload="draw()"> <canvas id="myCanvus" width="400px" height="400px" style="border:1px dashed black;"> 出現文字表示你的瀏覽器不支援HTML5 </canvas> </body></html><script type="text/javascript"><!-- function draw(){ var canvas=document.getElementById("myCanvus"); var context=canvas.getContext("2d"); context.fillStyle = "red"; context.fillRect(0, 0, 400, 400); context.translate(200,305); context.rotate(Math.PI/4); context.fillRect(-200, -200, 250, 250); context.fillStyle = "black";// 填充黑色 context.translate(-200,-200); context.fillRect(0, 0, 50, 150);// 填充矩形，參數分別為橫座標，縱座標，寬高 context.fillRect(49, 100, 200, 50); context.fillRect(200, 149, 50, 100);// 注意位置微調了，如果卡在零界點上會有背景的紅線殘留 context.fillRect(100, 0, 150, 50); context.fillRect(100, 49, 50, 200);// 注意位置微調了，如果卡在臨界點上會有背景的紅線殘留 context.fillRect(0, 200, 101, 50); context.strokeStyle = "yellow";// 描邊黃色 context.strokeRect(50, 0, 50, 100);// 描邊，參數分別為橫座標，縱座標，寬高 context.strokeRect(150, 50, 100, 50); context.strokeRect(0, 150, 100, 50); context.strokeRect(150, 150, 50, 100); context.strokeRect(0, 0, 250, 250); context.fillStyle = "red";// 用紅色矩形塊抹去多餘的黃邊 context.fillRect(51, -2, 48, 100);// 注意起點和寬度都微調了，如果卡在臨界點上會有細細的黃線殘留 context.fillRect(151, 51, 101, 48); context.fillRect(151, 151, 48, 101); context.fillRect(-2, 151, 100, 48); }//--></script>
HTML5 Canvas 描畫旋轉45度佛教萬字
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