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annotate main.c @ 5:6be2faa7ed6e

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rectangles with variable height
author Dennis C. M. <dennis@denniscm.com>
date Tue, 13 Jun 2023 17:23:52 +0100
parents 035d3880da04
children 40a8bdbe2005
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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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8 #define HEIGHT 1080
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9 #define WIDTH 1920
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12 void setup() {
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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, WIDTH, HEIGHT, 0);
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27 }
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30 void display() {
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31 glClear(GL_COLOR_BUFFER_BIT);
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32 glBegin(GL_QUADS);
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34 float x = 1;
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35 float rect_width = 5.0;
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36 float space = 5.0;
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37
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38 // Compute max number of rectangles to fit the windows
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39 int max_rects = floor((WIDTH - rect_width) / (rect_width + space)) + x;
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41 // Initialize empty array with same of `max_rects`
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42 int *unsorted_array = (int*)malloc(max_rects * sizeof(int));
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43
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44 int rect_counter = 0;
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45 while (rect_counter < max_rects) {
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46 int height = random_int(100, HEIGHT - 100);
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47
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48 glVertex2f(x, HEIGHT - 100);
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49 glVertex2f(x + rect_width, HEIGHT - 100);
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50 glVertex2f(x + rect_width, height);
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51 glVertex2d(x, height);
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52
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53 x += rect_width + space;
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54 rect_counter++;
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55 }
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57 glEnd();
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59 char text[256];
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60 sprintf(text, "Number of elements: %i", rect_counter);
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61 render_text(text, 20.0, HEIGHT - 50);
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62 glFlush();
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63 }
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66 int main(int argc, char** argv) {
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67 glutInit(&argc, argv);
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68 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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69 glutInitWindowSize(WIDTH, HEIGHT);
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70 glutCreateWindow("OpenGL Window");
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71 setup();
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72 glutDisplayFunc(display);
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73 glutMainLoop();
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75 return 0;
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76 }