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function drawCD() { var g2 = document.getElementById("cdCover").getContext("2d"); g2.save(); g2.translate(0, cdCase.height * 2 - 1); g2.scale(1, -1); g2.beginPath(); g2.moveTo(0, cdCase.height / 2); g2.lineTo(cdCase.width, cdCase.height / 2); g2.lineTo(cdCase.width, cdCase.height + 1); g2.lineTo(0, cdCase.height + 1); g2.clip(); g2.drawImage(cover, 19, 3, 240, 227); g2.drawImage(reflections, 0, 0); g2.drawImage(stitch, 19, 3); g2.drawImage(cdCase, 0, 0); g2.globalCompositeOperation = "destination-out"; var alphaMask = g2.createLinearGradient(0, cdCase.height / 2, 0, cdCase.height); alphaMask.addColorStop(0, "rgba(255, 255, 255, 1.0)"); alphaMask.addColorStop(1.0, "rgba(255, 255, 255, 0.5)"); g2.fillStyle = alphaMask; g2.fillRect(0, cdCase.height / 2, cdCase.width, cdCase.height / 2); g2.restore(); g2.drawImage(cover, 19, 3, 240, 227); g2.drawImage(reflections, 0, 0); g2.drawImage(stitch, 19, 3); g2.drawImage(cdCase, 0, 0); }
URL: http://ajaxian.com/archives/killer-effects-with-canvas