test-gcanvas-node/core/test/benchmarks/fillstyle/tc_2d_globalAlpha.js

gcanvas for node developer

ctx.fillStyle = "red";
ctx.fillRect(10*ratio, 10*ratio, 100*ratio, 100*ratio);
ctx.globalAlpha = 0.2;
ctx.fillStyle = "green";
ctx.fillRect(50*ratio, 50*ratio, 100*ratio, 100*ratio);
ctx.fillStyle = "blue";
ctx.fillRect(100*ratio, 100*ratio, 100*ratio, 100*ratio);