Canvas scale- 缩放
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Canvas scale- 缩放
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可以進行坐標縮放，設為負值可以翻轉圖片；
<!DOCTYPE html> <html lang="en"><head><meta charset="UTF-8"><title>scale</title> </head><body><canvas id='myCanvas' width='800' height='600'>your browser does not support canvas</canvas><script type="text/javascript">var c = document.getElementById('myCanvas');var ctx = c.getContext('2d');ctx.beginPath();ctx.strokeStyle = '#000000';ctx.strokeRect(10, 10, 150, 100);ctx.scale(3, 3);ctx.beginPath();ctx.strokeStyle = '#cccccc';ctx.strokeRect(10, 10, 150, 100);ctx.scale(0.15,0.15);ctx.beginPath();ctx.strokeStyle = '#ff0000';ctx.strokeRect(10,10,150,100);</script> </body></html> <!DOCTYPE html> <html lang="en"><head><meta charset="UTF-8"><title>scale</title> </head><body><canvas id='myCanvas' width='800' height='600'>your browser does not support canvas</canvas><script type="text/javascript">var c = document.getElementById('myCanvas');var ctx = c.getContext('2d');var img = new Image();img.src = 'face.jpg';img.onload = function() {ctx.drawImage(img, 10, 10);ctx.scale(1, -1);ctx.drawImage(img, 250, -250);ctx.arc(250, -250, 20, 0, 2 * Math.PI, true);ctx.stroke();};</script> </body></html>?
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