Mercurial > public > algo-animator

annotate main.c @ 16:2ded5f1f544a

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refactor variable name
author Dennis C. M. <dennis@denniscm.com>
date Sun, 25 Jun 2023 16:52:44 +0100
parents e2fcfcb43fee
children fba66d02f1cf
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <GL/glut.h>
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4 #include <math.h>
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5 #include <time.h>
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6 #include <stdbool.h>
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7 #include <ft2build.h>
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8 #include FT_FREETYPE_H
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10
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11 #define WINDOW_HEIGHT 1080
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12 #define WINDOW_WIDTH 1920
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13 #define VPADDING 150
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14 #define RECT_WIDTH 5
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15 #define SPACE 1
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17
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18 /* Global variables */
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19
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20 FT_Library ft_library;
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21 FT_Face ft_face;
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22
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23 char algos[4][50] = {
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24 "Bubble sort",
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25 "Selection sort",
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26 "Insertion sort",
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27 "Quick sort"
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28 };
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29
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30 int selected_algo = 0;
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31 int refresh_counter = 0;
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32 int iter_counter = 0;
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33 int arr_size;
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34
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35 int* arr;
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36
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37 bool run;
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39
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40 /* Algorithms */
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41
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42 // Bubble sort
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43 struct BubbleSortInfo {
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44 int step;
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45 int i;
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46 };
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47
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48 struct BubbleSortInfo bs = {1, 0};
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49
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50 void bubble_sort() {
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51 if (bs.i < arr_size - bs.step - 1) {
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52 int current = arr[bs.i];
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53 int next = arr[bs.i + 1];
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54
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55 if (current > next) {
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56 arr[bs.i + 1] = current;
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57 arr[bs.i] = next;
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58 }
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59
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60 bs.i++;
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61 } else {
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62 bs.step++;
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63 bs.i = 0;
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64 }
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65 }
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67
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68 /* Helper functions */
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69
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70 void create_array() {
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71 arr_size = floor((WINDOW_WIDTH - RECT_WIDTH) / (RECT_WIDTH + SPACE)) + 1;
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72 arr = (int*)malloc(arr_size * sizeof(int));
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73
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74 srand(time(NULL));
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75
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76 int min = VPADDING;
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77 int max = WINDOW_HEIGHT - VPADDING;
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78
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79 for (int i = 0; i < arr_size; i++) {
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80 arr[i] = rand() % ((max - min) + 1) + min;
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81 }
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82 }
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83
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84
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85 bool array_sorted() {
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86 for (int i = 0; i < arr_size - 1; i++) {
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87 if (arr[i] > arr[i + 1]) {
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88 return false;
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89 }
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90 }
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91
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92 return true;
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93 }
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95
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96 void algo_selector(int direction) {
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97 int selection = selected_algo + direction;
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98 int lower = 0;
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99 int upper = (sizeof(algos) / sizeof(algos[0])) - 1;
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100
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101 if (selection >= lower && selection <= upper) {
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102 selected_algo = selection;
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103 }
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104 }
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105
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106
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107 /* Render functions */
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108
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109 unsigned char* flipBitmapVertically(unsigned char* bitmap, int width, int height) {
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110 unsigned char* flippedBitmap = (unsigned char*)malloc(width * height);
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111
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112 for (int row = 0; row < height; row++) {
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113 unsigned char* srcRow = bitmap + (row * width);
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114 unsigned char* destRow = flippedBitmap + ((height - row - 1) * width);
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115 memcpy(destRow, srcRow, width);
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116 }
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117
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118 return flippedBitmap;
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119 }
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120
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121
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122 void render_text(int x, int y, char* text) {
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123 for (const char *c = text; *c; c++) {
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124
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125 // Get glyph index from character code
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126 FT_UInt glyph_index = FT_Get_Char_Index(ft_face, *c);
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127
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128 if (glyph_index == 0) {
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129 fprintf(stderr, "Given character code has no glyph image in the face\n");
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130 exit(1);
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131 }
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132
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133 // Load glyph image
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134 if (FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_DEFAULT)) {
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135 fprintf(stderr, "Failed to load glyph.\n");
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136 exit(1);
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137 }
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138
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139 // Render glyph
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140 if (FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL)) {
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141 fprintf(stderr, "Failed to render glyph.\n");
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142 exit(1);
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143 }
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144
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145 FT_GlyphSlot slot = ft_face->glyph;
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146 FT_Bitmap* glyph_bitmap = &slot->bitmap;
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147
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148 // Flip the bitmap vertically
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149 unsigned char* flipped_bitmap = (unsigned char*)malloc(glyph_bitmap->width * glyph_bitmap->rows);
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150
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151 for (int row = 0; row < glyph_bitmap->rows; row++) {
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152 unsigned char* src_row = glyph_bitmap->buffer + (row * glyph_bitmap->width);
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153 unsigned char* dest_row = flipped_bitmap + ((glyph_bitmap->rows - row - 1) * glyph_bitmap->width);
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154 memcpy(dest_row, src_row, glyph_bitmap->width);
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155 }
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156
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157 glyph_bitmap->buffer = flipped_bitmap;
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158
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159 // Calculate the adjusted y position based on the glyph's bearing
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160 int adjusted_y = y + (slot->bitmap_top - glyph_bitmap->rows);
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161
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162 glRasterPos2f(x, adjusted_y);
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163 glDrawPixels(glyph_bitmap->width, glyph_bitmap->rows, GL_LUMINANCE, GL_UNSIGNED_BYTE, glyph_bitmap->buffer);
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164
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165 x += 15;
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166 }
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167 }
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168
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169
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170 void display() {
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171 glClear(GL_COLOR_BUFFER_BIT);
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172
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173 glBegin(GL_QUADS);
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174
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175 int x = 0;
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176 for (int i = 0; i < arr_size; i++) {
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177
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178 // Bottom left
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179 glVertex2f(x, VPADDING);
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180
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181 // Top left
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182 glVertex2f(x, arr[i]);
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183
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184 // Top right
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185 glVertex2f(x + RECT_WIDTH, arr[i]);
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186
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187 // Bottom right
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188 glVertex2f(x + RECT_WIDTH, VPADDING);
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189
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190 x += RECT_WIDTH + SPACE;
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191 }
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192
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193 glEnd();
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194
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195 // Render text
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196 char text[256];
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197
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198 sprintf(text, "Algorithm: %s", algos[selected_algo]);
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199 render_text(20, WINDOW_HEIGHT - 50, text);
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200
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201 sprintf(text, "Number of elements: %i", arr_size);
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202 render_text(20, WINDOW_HEIGHT - 80, text);
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203
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204 sprintf(text, "Iterations: %i", iter_counter);
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205 render_text(20, WINDOW_HEIGHT - 110, text);
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206
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207 render_text(20, VPADDING - 50, "Press a or s to select an algorithm");
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208 render_text(20, VPADDING - 80, "Press enter to run the algorithm");
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209 render_text(20, VPADDING - 110, "Press r to reset array");
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210
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211 glutSwapBuffers();
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212 }
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213
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214
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215 /* Refresh function */
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216
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217 void idle() {
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218 if (run) {
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219 bubble_sort();
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220 refresh_counter++;
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221 iter_counter++;
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222
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223 if (refresh_counter == 90) {
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224 glutPostRedisplay();
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225 refresh_counter = 0;
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226 }
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227
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228 } else {
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229 glutPostRedisplay();
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230 }
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231
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232 if (array_sorted()) {
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233 run = false;
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234 }
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235 }
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236
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237
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238 /* User input handler */
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239
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240 void keyboard(unsigned char key, int x, int y) {
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241
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242 // s
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243 if (key == 115) {
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244 algo_selector(1);
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245 }
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246
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247 // a
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248 if (key == 97) {
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249 algo_selector(-1);
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250 }
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251
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252 // r
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253 if (key == 114) {
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254
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255 // Reset array
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256 create_array();
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257
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258 // Reset state
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259 iter_counter = 0;
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260 refresh_counter = 0;
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261 run = false;
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262
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263 // Reset algo steps
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264 bs = (struct BubbleSortInfo){0, 0};
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265 }
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266
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267 // enter
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268 if (key == 13) {
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269 run = true;
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270 }
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271 }
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272
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273
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274 /* Set up functions */
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275
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276 void setup_gl() {
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277
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278 // Set background dark
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279 glClearColor(0.0, 0.0, 0.0, 1.0);
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280
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281 // Set point color and size to 1 pixel
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282 glColor3f(1.0, 0.7569, 0.0);
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283 glPointSize(5.0);
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284
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285 // Matrix projection and reset with identity
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286 glMatrixMode(GL_PROJECTION);
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287 glLoadIdentity();
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288
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289 /*
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290 * Creates projection matrix
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291 * x increases from left to right (0 to WINDOW_WIDTH)
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292 * y increases from bottom to top (0 to WINDOW_HEIGHT)
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293 */
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294
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295 gluOrtho2D(0, WINDOW_WIDTH, 0, WINDOW_HEIGHT);
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296
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297 /*
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298 * This fucking line... I spent a day rendering weird symbols
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299 * because the padding that adds FreeType to each row of the bitmap
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300 * does not match the padding expected by GL.
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301 */
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302
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303 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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304 }
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305
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306
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307 void setup_freetype() {
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308
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309 // Init library
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310 if (FT_Init_FreeType(&ft_library)) {
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311 fprintf(stderr, "Failed to initialize FreeType library\n");
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312 exit(1);
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313 }
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314
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315 // Load font
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316 if (FT_New_Face(ft_library, "fonts/JetBrainsMono-Regular.ttf", 0, &ft_face)) {
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317 fprintf(stderr, "Failed to load font\n");
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318 exit(1);
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319 }
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320
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321 // Set font size
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322 if (FT_Set_Pixel_Sizes(ft_face, 0, 24)) {
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323 fprintf(stderr, "Failed to set font size.\n");
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324 FT_Done_Face(ft_face);
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325 FT_Done_FreeType(ft_library);
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326
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327 exit(1);
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328 }
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329 }
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330
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331
0
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332 int main(int argc, char** argv) {
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333 create_array();
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334
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335 glutInit(&argc, argv);
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336 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
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337 glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT);
13
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338 glutCreateWindow("Algorithm animator");
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339
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340 setup_gl();
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341 setup_freetype();
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342
0
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343 glutDisplayFunc(display);
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344 glutKeyboardFunc(keyboard);
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345 glutIdleFunc(idle);
0
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346 glutMainLoop();
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347
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348 free(arr);
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349
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350 FT_Done_Face(ft_face);
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351 FT_Done_FreeType(ft_library);
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352
0
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353 return 0;
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354 }