39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
Filter.prototype.filter_chromatic = function(pixels = this.pixels(),p = null)
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{
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var s;
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if(p.length === 0)
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s = {r:2,g:2,b:2};
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else if(p.length < 3)
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s = {r:parseFloat(p[0]), g:parseFloat(p[0])*.5, b:0};
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else
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s = {r:parseFloat(p[0]), g:parseFloat(p[1]), b:parseFloat(p[2])};
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var hw = pixels.width*.5;
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var hh = pixels.height*.5;
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var maxLength = Math.sqrt(hw*hw+hh*hh);
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var output = new ImageData(pixels.width, pixels.height);
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for (var i=0; i<pixels.width; i++) {
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for(var j=0; j<pixels.height; j++){
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var x = i-hw;
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var y = j-hh;
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var a = Math.atan2(y,x);
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var d = Math.sqrt(x*x+y*y);
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var f = (d-s.r*d/maxLength);
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x = Math.cos(a)*f+hw;
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y = Math.sin(a)*f+hh;
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var r = this.get_color_bilinear(pixels, x, y);
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f = (d-s.g*d/maxLength);
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x = Math.cos(a)*f+hw;
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y = Math.sin(a)*f+hh;
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var g = this.get_color_bilinear(pixels, x, y);
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f = (d-s.b*d/maxLength);
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x = Math.cos(a)*f+hw;
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y = Math.sin(a)*f+hh;
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var b = this.get_color_bilinear(pixels, x, y);
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var c = {r:r.r, g:g.g, b:b.b,a:Math.max(r.a, Math.max(g.a,b.a))};
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this.set_color(output, c, i,j);
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}
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}
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ronin.canvas.clear();
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ronin.surface.context().putImageData(output, 0, 0, 0, 0, pixels.width, pixels.height);
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}
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