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annotate main.c @ 2:ea3c427d922d

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draw a weird filled rectangle
author Dennis C. M. <dennis@denniscm.com>
date Mon, 12 Jun 2023 18:45:30 +0100
parents 6882194679b5
children e4003f606e07
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1 #include <stdio.h>
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2 #include <GL/glut.h>
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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(-300, 300, 300, -300);
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25 glMatrixMode(GL_MODELVIEW);
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26 glLoadIdentity();
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27
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28 }
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31 void display() {
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32 glClear(GL_COLOR_BUFFER_BIT);
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33 glRectf(100.0f, 100.0f, 200.0f, 200.0f);
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34 // glVertex2i(1920/2, 1080/2);
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35 glFlush();
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36 }
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38
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39 int main(int argc, char** argv) {
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40 glutInit(&argc, argv);
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41 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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42 glutInitWindowSize(WIDTH, HEIGHT);
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43 glutCreateWindow("OpenGL Window");
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44 setup();
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45 glutDisplayFunc(display);
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46 glutMainLoop();
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47
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48 return 0;
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49 }