I've been experimenting with drawing a series of intersecting shapes using paths in CanvasRenderingContext2D. While it's going smoothly, I'm now looking to merge all these paths so that when I fill them with a semi-transparent color, the overlaps are hidden. Additionally, I want to outline the merged shapes. Any ideas on how I can make this happen?
To prevent overlapping semi-transparent pixels from interacting, you can convert the semi-transparent pixels (in RGBA format) to equivalent opaque pixels (in RGB format).
function RGBAtoRGB(r, g, b, a, backgroundR,backgroundG,backgroundB){
var r3 = Math.round(((1 - a) * backgroundR) + (a * r))
var g3 = Math.round(((1 - a) * backgroundG) + (a * g))
var b3 = Math.round(((1 - a) * backgroundB) + (a * b))
return "rgb("+r3+","+g3+","+b3+")";
}
For each sub-shape, it is important to use a separate beginPath. This ensures that each shape has its own styling (fillStyle) per beginpath.
Depending on your specific design needs, you may need to adjust the drawing order of your sub-shapes so that the desired opaque shapes are displayed on top.
Mark, I appreciate your advice but I have discovered a more efficient method for accomplishing this task.
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