XML/HTML Code復制內(nèi)容到剪貼板
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>圖形組合</title>
- <style type="text/css">
- #canvas{
- border: 1px solid #1C0EFA;
- display: block;
- margin: 20px auto;
- }
- #buttons{
- width: 1000px;
- margin: 5px auto;
- clear:both;
- }
- #buttons a{
- font-size: 18px;
- display: block;
- float: left;
- margin-left: 20px;
- }
- </style>
- </head>
- <body>
- <canvas id="canvas" width="1000" height="800">
- 你的瀏覽器還不支持canvas
- </canvas>
- <div id="buttons">
- <a href="#">source-over</a>
- <a href="#">source-atop</a>
- <a href="#">source-in</a>
- <a href="#">source-out</a>
- <a href="#">destination-over</a>
- <a href="#">destination-atop</a>
- <a href="#">destination-in</a>
- <a href="#">destination-out</a>
- <a href="#">lighter</a>
- <a href="#">copy</a>
- <a href="#">xor</a>
- </div>
- </body>
- <script type="text/javascript">
-
- window.onload = function(){
- draw("source-over");
-
- var buttons = document.getElementById("buttons").getElementsByTagName("a");
- for (var i = 0; i < buttons.length; i++) {
- buttons[i].onclick = function(){
- draw(this.text);
- return false;
- };
- }
- };
-
- function draw(compositeStyle){
- var canvas = document.getElementById("canvas");
- var context = canvas.getContext("2d");
-
- context.clearRect(0, 0, canvas.width, canvas.height);
-
- //draw title
- context.font = "bold 40px Arial";
- context.textAlign = "center";
- context.textBasedline = "middle";
- context.fillStyle = "#150E0E";
- context.fillText("globalCompositeOperation = "+compositeStyle, canvas.width/2, 60);
-
- //draw a rect
- context.fillStyle = "#F6082A";
- context.fillRect(300, 150, 500, 500);
-
- //draw a triangle
- context.globalCompositeOperation = compositeStyle;
- context.fillStyle = "#1611F5";
- context.beginPath();
- context.moveTo(700, 250);
- context.lineTo(1000,750);
- context.lineTo(400, 750);
- context.closePath();
- context.fill();
- }
-
- </script>
- </html>
