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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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