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topic_basics_of_distributed_memory_programming/compute_julia_pixel.c
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| /* | ||
| * compute_julia_pixel(): compute RBG values of a pixel in a | ||
| * particular Julia set image. | ||
| * | ||
| * In: | ||
| * (x,y): pixel coordinates | ||
| * (width, height): image dimensions | ||
| * tint_bias: a float to "tweak" the tint (1.0 is "no tint") | ||
| * Out: | ||
| * rgb: an already-allocated 3-byte array into which R, G, and B | ||
| * values are written. | ||
| * | ||
| * Return: | ||
| * 0 in success, -1 on failure | ||
| * | ||
| */ | ||
|
|
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| int compute_julia_pixel(int x, int y, int width, int height, float tint_bias, unsigned char *rgb) { | ||
|
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| // Check coordinates | ||
| if ((x < 0) || (x >= width) || (y < 0) || (y >= height)) { | ||
| fprintf(stderr,"Invalid (%d,%d) pixel coordinates in a %d x %d image\n", x, y, width, height); | ||
| return -1; | ||
| } | ||
|
|
||
| // "Zoom in" to a pleasing view of the Julia set | ||
| float X_MIN = -1.6, X_MAX = 1.6, Y_MIN = -0.9, Y_MAX = +0.9; | ||
| float float_y = (Y_MAX - Y_MIN) * (float)y / height + Y_MIN ; | ||
| float float_x = (X_MAX - X_MIN) * (float)x / width + X_MIN ; | ||
|
|
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| // Point that defines the Julia set | ||
| float julia_real = -.79; | ||
| float julia_img = .15; | ||
|
|
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| // Maximum number of iteration | ||
| int max_iter = 300; | ||
|
|
||
| // Compute the complex series convergence | ||
| float real=float_y, img=float_x; | ||
| int num_iter = max_iter; | ||
| while (( img * img + real * real < 2 * 2 ) && ( num_iter > 0 )) { | ||
| float xtemp = img * img - real * real + julia_real; | ||
| real = 2 * img * real + julia_img; | ||
| img = xtemp; | ||
| num_iter--; | ||
| } | ||
|
|
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| // Paint pixel based on how many iterations were used, using some funky colors | ||
| float color_bias = (float) num_iter / max_iter; | ||
| rgb[0] = (num_iter == 0 ? 200 : - 500.0 * pow(tint_bias, 1.2) * pow(color_bias, 1.6)); | ||
| rgb[1] = (num_iter == 0 ? 100 : -255.0 * pow(color_bias, 0.3)); | ||
| rgb[2] = (num_iter == 0 ? 100 : 255 - 255.0 * pow(tint_bias, 1.2) * pow(color_bias, 3.0)); | ||
|
|
||
| return 0; | ||
| } |
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