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comparison 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
comparison
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2:ea3c427d922d 3:e4003f606e07
18 // Matrix projection and reset with identity 18 // Matrix projection and reset with identity
19 glMatrixMode(GL_PROJECTION); 19 glMatrixMode(GL_PROJECTION);
20 glLoadIdentity(); 20 glLoadIdentity();
21 21
22 // Set the coordinates to be used with the viewport 22 // Set the coordinates to be used with the viewport
23 gluOrtho2D(-300, 300, 300, -300); 23 gluOrtho2D(0, WIDTH, HEIGHT, 0);
24
25 glMatrixMode(GL_MODELVIEW);
26 glLoadIdentity();
27
28 } 24 }
29 25
30 26
31 void display() { 27 void display() {
32 glClear(GL_COLOR_BUFFER_BIT); 28 glClear(GL_COLOR_BUFFER_BIT);
33 glRectf(100.0f, 100.0f, 200.0f, 200.0f); 29 glBegin(GL_QUADS);
34 // glVertex2i(1920/2, 1080/2); 30 /*
31 glVertex2f(100.0, 100.0); // Top left
32 glVertex2f(150.0, 100.0); // Top right
33 glVertex2f(150.0, 300.0); // Bottom right
34 glVertex2f(100.0, 300.0); // Bottom left
35
36 glVertex2f(160.0, 100.0);
37 glVertex2f(210.0, 100.0);
38 glVertex2f(210.0, 300.0);
39 glVertex2d(160.0, 300.0);
40 */
41
42 float rect_width = 5.0;
43 float space = 10.0;
44
45 for (float pos_x = 100.0; pos_x < 500.0; pos_x += 10.0) {
46 glVertex2f(pos_x, 100.0);
47 glVertex2f(pos_x + rect_width, 100.0);
48 glVertex2f(pos_x + rect_width, 300.0);
49 glVertex2d(pos_x, 300.0);
50 }
51
52 glEnd();
35 glFlush(); 53 glFlush();
36 } 54 }
37 55
38 56
39 int main(int argc, char** argv) { 57 int main(int argc, char** argv) {