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annotate main.c @ 3:e4003f606e07

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draw multiple rectangles with loop
author Dennis C. M. <dennis@denniscm.com>
date Mon, 12 Jun 2023 20:13:04 +0100
parents ea3c427d922d
children 035d3880da04
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1 #include <stdio.h>
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2 #include <GL/glut.h>
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4
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5 #define HEIGHT 1080
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6 #define WIDTH 1920
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7
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8
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9 void setup() {
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11 // Set background dark
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12 glClearColor(0.0, 0.0, 0.0, 1.0);
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13
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14 // Set point color and size to 1 pixel
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15 glColor3f(0.0, 1.0, 0.0);
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16 glPointSize(5.0);
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17
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18 // Matrix projection and reset with identity
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19 glMatrixMode(GL_PROJECTION);
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20 glLoadIdentity();
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21
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22 // Set the coordinates to be used with the viewport
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23 gluOrtho2D(0, WIDTH, HEIGHT, 0);
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24 }
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26
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27 void display() {
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28 glClear(GL_COLOR_BUFFER_BIT);
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29 glBegin(GL_QUADS);
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30 /*
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31 glVertex2f(100.0, 100.0); // Top left
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32 glVertex2f(150.0, 100.0); // Top right
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33 glVertex2f(150.0, 300.0); // Bottom right
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34 glVertex2f(100.0, 300.0); // Bottom left
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35
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36 glVertex2f(160.0, 100.0);
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37 glVertex2f(210.0, 100.0);
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38 glVertex2f(210.0, 300.0);
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39 glVertex2d(160.0, 300.0);
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40 */
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41
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42 float rect_width = 5.0;
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43 float space = 10.0;
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44
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45 for (float pos_x = 100.0; pos_x < 500.0; pos_x += 10.0) {
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46 glVertex2f(pos_x, 100.0);
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47 glVertex2f(pos_x + rect_width, 100.0);
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48 glVertex2f(pos_x + rect_width, 300.0);
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49 glVertex2d(pos_x, 300.0);
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50 }
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51
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52 glEnd();
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53 glFlush();
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54 }
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55
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56
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57 int main(int argc, char** argv) {
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58 glutInit(&argc, argv);
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59 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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60 glutInitWindowSize(WIDTH, HEIGHT);
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61 glutCreateWindow("OpenGL Window");
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62 setup();
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63 glutDisplayFunc(display);
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64 glutMainLoop();
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65
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66 return 0;
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67 }