Adam Khoury

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Canvas Transformation Effects

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Adam Khoury
In this JavaScript canvas programming exercise you can learn to apply transformation effects like scale, skew, rotate, translate and understand the transform matrix. <!DOCTYPE html> <html> <head> <style> body{ margin:10px; background:#666; } #my_canvas{ background:#FFF; border:#000 1px solid; } </style> <script> function draw(){ var ctx = document.getElementById('my_canvas').getContext('2d'); // scale(x, y) 1, 1 is default scale // rotate(angle) Angle value expressed in radians // translate(x, y) Positive or negative numbers // transform(xScale, ySkew, xSkew, yScale, xTrans, yTrans) // Default transform matrix is (1,0,0,1,0,0) // setTransform(xScale, ySkew, xSkew, yScale, xTrans, yTrans) ctx.fillStyle = '#FC0'; ctx.fillRect(50, 50, 100, 100); ctx.transform(1,0,.5,1,0,0); ctx.fillRect(170, 50, 100, 100); ctx.setTransform(1,0,0,1,0,0); ctx.fillRect(170, 170, 100, 100); } window.onload = draw; </script> </head> <body> <canvas id="my_canvas" width="500" height="350"></canvas> </body> </html>