79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
#include "vkvm.hpp"
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#include <cmath>
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#include <internal.hpp>
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long double map(long double value, long double inputMin, long double inputMax, long double outputMin, long double outputMax) {
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return (value - inputMin) * (outputMax - outputMin) / (inputMax - inputMin) + outputMin;
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}
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void mandelbrot() {
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int width = 800;
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int height = 600;
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vkvm::setWidth(width);
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vkvm::setHeight(height);
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vkvm::setRedrawInterval(-1);
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long double min = -2.84;
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long double max = 1;
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int maxIterations = 200;
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double factor = 1;
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for (int count = 0; count < 50; count++) {
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max -= 0.1 * factor;
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min += 0.15 * factor;
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factor *= 0.9349;
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maxIterations += 5;
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if(count > 30) {
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maxIterations *= 1.02;
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}
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for (int x = 0; x < width; ++x) {
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for (int y = 0; y < height; ++y) {
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long double xMap = map(x, 0, width, min, max);
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long double yMap = map(y, 0, height, min, max);
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long double xInitial = xMap;
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long double yInitial = yMap;
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int n = 0;
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for (int i = 0; i < maxIterations; ++i) {
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long double x1 = xMap * xMap - yMap * yMap;
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long double y1 = 2 * xMap * yMap;
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xMap = x1 + xInitial;
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yMap = y1 + yInitial;
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if ((xMap + yMap) > 2) {
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break;
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}
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n++;
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}
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int brightness = map(n, 0, maxIterations, 0, 255);
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if (n == maxIterations || (brightness < 20)) {
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brightness = 0;
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}
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int red = map(brightness * brightness, 0, 255 * 255, 0, 255);
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int green = brightness;
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int blue = map(sqrt(brightness), 0, sqrt(255), 0, 255);
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vkvm::setPixel(x, y, vkvm::Color(red, green, blue));
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}
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}
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vkvm::callEvent(vkvm::EventType::Redraw);
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}
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vkvm::setRedrawInterval(500);
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}
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