39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
#include "tricorn.h"
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static const float convergenceLimit = 2.0f;
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unsigned converge(float complex position,unsigned n);
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void tricorn(float complex start, size_t width, ssize_t height, float res, unsigned n, _Bool color, unsigned char* img){
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height = height < 0 ? height*-1 : height;
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for(size_t i = 0; i < width; i++){
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for(ssize_t j = 0; j < height; j++){
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unsigned value = converge(start + (i*res + I*j*res),n);
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size_t position = (i*width +j) *3;
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if(!color){
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img[position] = value;
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img[position + 1] = value;
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img[position + 2] = value;
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}
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else{ // TEMPORARY / Bad looking color gradient before testing
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img[position] = (value % 85)*3;
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img[position + 1] = 85 +(value % 85) * 2;
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img[position + 2] = 170 +(value % 85);
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}
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}
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}
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}
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unsigned converge(float complex position,unsigned n){
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complex float result = 0;
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for(unsigned i = 0; i < n; i++){
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result = cpowf(conjf(result),2) + position;
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if(sqrtf(crealf(result)+cimagf(result)) > convergenceLimit)
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return 255-4*(i % 64);
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}
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return 0;
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} |