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annotate main.c @ 6:40a8bdbe2005

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Refactor to array of structures
author Dennis C. M. <dennis@denniscm.com>
date Tue, 13 Jun 2023 18:37:23 +0100
parents 6be2faa7ed6e
children f159eec07daf
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1 #include "utils.h"
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <math.h>
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5 #include <time.h>
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7
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8 #define WINDOW_HEIGHT 1080
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9 #define WINDOW_WIDTH 1920
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12 void setup() {
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13
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14 // Set background dark
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15 glClearColor(0.0, 0.0, 0.0, 1.0);
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17 // Set point color and size to 1 pixel
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18 glColor3f(0.0, 1.0, 0.0);
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19 glPointSize(5.0);
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20
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21 // Matrix projection and reset with identity
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22 glMatrixMode(GL_PROJECTION);
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23 glLoadIdentity();
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24
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25 // Set the coordinates to be used with the viewport
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26 gluOrtho2D(0, WINDOW_WIDTH, WINDOW_HEIGHT, 0);
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27 }
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29
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30 struct Rectangle {
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31 int width;
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32 int height;
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33 int x_position;
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34 };
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36
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37 void display() {
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38 glClear(GL_COLOR_BUFFER_BIT);
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39 glBegin(GL_QUADS);
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41 float x_position = 1;
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42 float rect_width = 5.0;
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43 float space = 5.0;
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44
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45 // Compute max number of rectangles to fit the windows
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46 int max_rects = floor((WINDOW_WIDTH - rect_width) / (rect_width + space)) + x_position;
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47
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48 struct Rectangle *rectangles = malloc(max_rects * sizeof(struct Rectangle));
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49 int rect_counter = 0;
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50
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51 while (rect_counter < max_rects) {
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52 struct Rectangle rectangle;
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53 rectangle.width = rect_width;
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54 rectangle.height = random_int(100, WINDOW_HEIGHT - 100);
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55 rectangle.x_position = x_position;
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56 rectangles[rect_counter] = rectangle;
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57
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58 draw_rectangle(
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59 rectangle.x_position,
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60 rectangle.height,
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61 rectangle.width,
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62 WINDOW_HEIGHT
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63 );
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64
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65 x_position += rect_width + space;
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66 rect_counter++;
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67 }
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69 glEnd();
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70
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71 char text[256];
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72 sprintf(text, "Number of elements: %i", rect_counter);
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73 render_text(text, 20.0, WINDOW_HEIGHT - 50);
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74
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75 free(rectangles);
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76 glFlush();
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77 }
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80 int main(int argc, char** argv) {
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81 glutInit(&argc, argv);
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82 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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83 glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT);
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84 glutCreateWindow("OpenGL Window");
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85 setup();
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86 glutDisplayFunc(display);
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87 glutMainLoop();
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88
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89 return 0;
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90 }