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137 lines
2.9 KiB
137 lines
2.9 KiB
#include "../Logger.hpp"
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#include <fstream>
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#include <cmath>
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#include <cstdlib>
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#include <cassert>
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#include "../pngwriter/pngwriter.h"
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#include "PNG.hpp"
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PNG::PNG(unsigned int width, unsigned int height, unsigned int num_colors):
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Canvas(2), width(width), height(height), num_colors(num_colors), v(0) {
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int_array = new unsigned int[width*height*num_colors];
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assert(int_array != NULL);
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clear();
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LogDebug("New Canvas\n");
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}
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void PNG::clear() {
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for(unsigned int i = 0; i < width*height*num_colors; i++) {
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int_array[i] = 0;
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}
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}
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void PNG::plot(const double* position) {
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const double& x = position[0];
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const double& y = position[1];
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const unsigned int x_int = x*width + width*.5;
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const unsigned int y_int = y*width + height*.5;
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const unsigned int index = x_int + width * y_int;
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if(x_int < width && y_int < height) {
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int_array[index]++;
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}
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}
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/*
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I/O functions
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*/
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void PNG::output_file(const char* filename) const {
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unsigned int* max_int = new unsigned int[num_colors];
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double* power = new double[num_colors];
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for(unsigned int i = 0; i < num_colors; i++) {
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max_int[i] = 0;
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double cumulative = 0;
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unsigned int n = 0;
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for(unsigned int j = 0; j < width*height; j++) {
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if(max_int[i] < int_array[j+i*width*height]) {
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max_int[i] = int_array[j+i*width*height];
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}
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if(int_array[j+i*width*height]) {
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cumulative += int_array[j+i*width*height];
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n++;
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}
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}
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if(n > 100) {
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const double average = cumulative / (double)n;
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power[i] = -2.5/log(average/(double)max_int[i]);
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if(power[i] < 0)
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power[i] = 1;
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} else {
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power[i] = 1;
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}
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if(n <= 10) {
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LogInfo("not enough data\n");
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}
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}
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const double vibrancy = 2.0;
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double averagePower = 0;
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for(unsigned int i = 0; i < num_colors; i++) {
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averagePower += power[i];
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}
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averagePower /= (double)num_colors;
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for(unsigned int i = 0; i < num_colors; i++) {
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power[i] = vibrancy*power[i] + (1.0 - vibrancy)*averagePower;
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}
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pngwriter* pngFile = new pngwriter(width, height, 0.0, filename);
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pngFile->setcompressionlevel(9);
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pngFile->settext("Attractor", "Joshua Moerman", "A awesome attractor", "AwesomeAttractor");
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for(unsigned int x = 0; x < width; x++) {
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for(unsigned int y = 0; y < height; y++) {
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double r = 0.0;
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double g = 0.0;
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double b = 0.0;
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for(unsigned int c = 0; c < num_colors; c++) {
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const double norm_value = (double)int_array[x + y*width + c*width*height]/max_int[c];
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switch(c) {
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case 0: {
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r = (pow(norm_value, power[c]))*3.5;
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break;
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}
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case 1: {
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g = (pow(norm_value, power[c]))*3.0;
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break;
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}
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case 2: {
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b = (pow(norm_value, power[c]))*3.0;
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break;
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}
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default:
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break;
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}
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}
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//pngwriter clips values for me
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pngFile->plot(x, y, r, g, b);
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}
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}
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delete[] max_int;
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delete[] power;
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LogInfo("Writing %s\n", filename);
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std::ofstream file(filename);
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if(!file) {
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LogError("Couldn't write to file");
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}
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pngFile->close();
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LogMoreInfo("File written");
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}
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