alpha.js Example File
script/context2d/scripts/alpha.jsvar ctx = document.getElementById('tutorial').getContext('2d'); // draw background ctx.fillStyle = '#FD0'; ctx.fillRect(0,0,75,75); ctx.fillStyle = '#6C0'; ctx.fillRect(75,0,75,75); ctx.fillStyle = '#09F'; ctx.fillRect(0,75,75,75); ctx.fillStyle = '#F30'; ctx.fillRect(75,75,75,75); ctx.fillStyle = '#FFF'; // set transparency value ctx.globalAlpha = 0.2; // Draw semi transparent circles for (i=0;i<7;i++){ ctx.beginPath(); ctx.arc(75,75,10+10*i,0,Math.PI*2,true); ctx.fill(); }
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