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Topic: Progressive fractal "rendering" (Read 912 times) |
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rgovostes
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Progressive fractal "rendering"
« on: Dec 29th, 2004, 10:45pm » |
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This code should take an image and progressively "render" it with a fractal-like method: it draws a solid rectangle representing the 'average' color of corresponding pixels in the image. Then it splits itself into 4 blocks. However, only the top-left quarter actually renders correctly, the others appear stretched. I'm betting its a small math problem I'm overlooking. (Update: fixed, doh) Then, there is the problem that it slows down horribly. After the 4th or 5th iteration, it isn't at all responsive. I realize I'm asking for a bit from the CPU, but it shouldn't crash... Code:// Render2D by Ryan Govostes // Progressively "renders" the source image /* Cat image from http://pantransit.reptiles.org/images/sorted/photo/animal/, credit given to Lisa Nielsen. */ BImage cat = loadImage("cat.jpg"); RenderBox[] renderers = new RenderBox[1]; RenderBox[] nextRenderers; void setup() { size(350, 350); framerate(2); renderers[0] = new RenderBox(0, 0, width, height); } void loop() { if(renderers.length > 16) return; /* remove for fun */ nextRenderers = new RenderBox[0]; for(int i = 0; i < renderers.length; i ++) { if(!renderers[i].used) renderers[i].drawAndIterate(); } renderers = nextRenderers; } color averageColor(float x, float y, float w, float h, BImage src) { BImage pxl = new BImage(1, 1); pxl.replicate(src, (int)x, (int)y, int(x + w), int(y + h), 0, 0, 1, 1); return pxl.pixels[0]; } void appendRenderer(RenderBox newRenderer) { RenderBox[] renderersPlus = new RenderBox[nextRenderers.length + 1]; System.arraycopy(nextRenderers, 0, renderersPlus, 0, nextRenderers.length); renderersPlus[nextRenderers.length] = newRenderer; nextRenderers = renderersPlus; } class RenderBox { public boolean used; private float x, y, w, h; RenderBox(float tx, float ty, float tw, float th) { x = tx; y = ty; w = tw; h = th; used = false; } void drawAndIterate() { noStroke(); fill(averageColor( x, y, w, h, cat )); rect( x, y, w, h ); if(w >= 2 && h >= 2) { appendRenderer( new RenderBox( x, y, (w / 2), (h / 2) ) ); appendRenderer( new RenderBox( x + (w / 2), y, (w / 2), (h / 2) ) ); appendRenderer( new RenderBox( x, y + (h / 2), (w / 2), (h / 2) ) ); appendRenderer( new RenderBox( x + (w / 2), y + (h / 2), (w / 2), (h / 2) ) ); } used = true; } } |
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« Last Edit: Dec 29th, 2004, 10:53pm by rgovostes » |
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