Mercurial > public > algo-animator
annotate main.c @ 8:f7af7255705e
text flickering fixed
| author | Dennis C. M. <dennis@denniscm.com> |
|---|---|
| date | Fri, 23 Jun 2023 16:46:43 +0100 |
| parents | f159eec07daf |
| children | b7da0083b706 |
| rev | line source |
|---|---|
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4
035d3880da04
render text with number of elements on screen
Dennis C. M. <dennis@denniscm.com>
parents:
3
diff
changeset
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1 #include "utils.h" |
| 8 | 2 #include <stdio.h> |
| 7 | 3 #include <GL/glut.h> |
| 0 | 4 |
| 5 | |
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6
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
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6 #define WINDOW_HEIGHT 1080 |
|
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
|
7 #define WINDOW_WIDTH 1920 |
| 7 | 8 #define RECT_WIDTH 5 |
| 9 #define SPACE 5 | |
| 10 | |
| 11 | |
| 12 struct Rectangle { | |
| 13 int width; | |
| 14 int height; | |
| 15 int x; | |
| 16 }; | |
| 17 | |
| 18 // Globals | |
| 19 struct Rectangle* rectangles; | |
| 20 int n_rectangles; | |
| 8 | 21 int test_counter = 0; |
| 0 | 22 |
| 23 | |
| 24 void setup() { | |
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2
ea3c427d922d
draw a weird filled rectangle
Dennis C. M. <dennis@denniscm.com>
parents:
0
diff
changeset
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25 |
| 0 | 26 // Set background dark |
| 27 glClearColor(0.0, 0.0, 0.0, 1.0); | |
| 28 | |
| 29 // Set point color and size to 1 pixel | |
| 30 glColor3f(0.0, 1.0, 0.0); | |
| 31 glPointSize(5.0); | |
| 32 | |
| 33 // Matrix projection and reset with identity | |
| 34 glMatrixMode(GL_PROJECTION); | |
| 35 glLoadIdentity(); | |
|
2
ea3c427d922d
draw a weird filled rectangle
Dennis C. M. <dennis@denniscm.com>
parents:
0
diff
changeset
|
36 |
| 0 | 37 // Set the coordinates to be used with the viewport |
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6
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
|
38 gluOrtho2D(0, WINDOW_WIDTH, WINDOW_HEIGHT, 0); |
| 8 | 39 |
| 40 } | |
| 41 | |
| 42 | |
| 43 void render_text(int x, int y, char* text) { | |
| 44 glRasterPos2f(x, y); | |
| 45 | |
| 46 for (const char *c = text; *c; ++c) { | |
| 47 glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, *c); | |
| 48 } | |
| 0 | 49 } |
| 50 | |
| 51 | |
| 52 void display() { | |
| 53 glClear(GL_COLOR_BUFFER_BIT); | |
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3
e4003f606e07
draw multiple rectangles with loop
Dennis C. M. <dennis@denniscm.com>
parents:
2
diff
changeset
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54 glBegin(GL_QUADS); |
|
e4003f606e07
draw multiple rectangles with loop
Dennis C. M. <dennis@denniscm.com>
parents:
2
diff
changeset
|
55 |
| 7 | 56 for (int i = 0; i < n_rectangles; i++) { |
| 57 glVertex2f(rectangles[i].x, WINDOW_HEIGHT - 100); | |
| 58 glVertex2f(rectangles[i].x + rectangles[i].width, WINDOW_HEIGHT - 100); | |
| 59 glVertex2f(rectangles[i].x + rectangles[i].width, rectangles[i].height); | |
| 60 glVertex2d(rectangles[i].x, rectangles[i].height); | |
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3
e4003f606e07
draw multiple rectangles with loop
Dennis C. M. <dennis@denniscm.com>
parents:
2
diff
changeset
|
61 } |
|
e4003f606e07
draw multiple rectangles with loop
Dennis C. M. <dennis@denniscm.com>
parents:
2
diff
changeset
|
62 |
|
e4003f606e07
draw multiple rectangles with loop
Dennis C. M. <dennis@denniscm.com>
parents:
2
diff
changeset
|
63 glEnd(); |
|
6
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
|
64 |
| 7 | 65 // Render text |
|
4
035d3880da04
render text with number of elements on screen
Dennis C. M. <dennis@denniscm.com>
parents:
3
diff
changeset
|
66 char text[256]; |
| 7 | 67 sprintf(text, "Number of elements: %i", n_rectangles); |
| 8 | 68 render_text(40.0, WINDOW_HEIGHT - 50, text); |
| 69 | |
| 70 sprintf(text, "Test counter: %i", test_counter); | |
| 71 render_text(540.0, WINDOW_HEIGHT - 50, text); | |
| 72 | |
| 73 glutSwapBuffers(); | |
| 74 glFlush(); | |
| 75 } | |
| 76 | |
|
6
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
|
77 |
| 8 | 78 void idle() { |
| 79 glutPostRedisplay(); | |
| 80 } | |
| 81 | |
| 82 | |
| 83 void keyboard(unsigned char key, int x, int y) { | |
| 84 | |
| 85 // 13 is the ASCII value of ENTER key | |
| 86 if (key == 13) { | |
| 87 test_counter++; | |
| 7 | 88 } |
| 0 | 89 } |
| 90 | |
| 91 | |
| 92 int main(int argc, char** argv) { | |
| 7 | 93 n_rectangles = floor((WINDOW_WIDTH - RECT_WIDTH) / (RECT_WIDTH + SPACE)) + 1; |
| 94 rectangles = malloc(n_rectangles * sizeof(struct Rectangle)); | |
| 95 | |
| 96 int x_pos = 1; | |
| 97 | |
| 98 int i = 0; | |
| 99 while (i < n_rectangles) { | |
| 100 rectangles[i].width = RECT_WIDTH; | |
| 101 rectangles[i].height = random_int(100, WINDOW_HEIGHT - 100); | |
| 102 rectangles[i].x = x_pos; | |
| 103 | |
| 104 x_pos += RECT_WIDTH + SPACE; | |
| 105 i++; | |
| 106 } | |
| 107 | |
| 0 | 108 glutInit(&argc, argv); |
| 8 | 109 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); |
|
6
40a8bdbe2005
Refactor to array of structures
Dennis C. M. <dennis@denniscm.com>
parents:
5
diff
changeset
|
110 glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT); |
| 0 | 111 glutCreateWindow("OpenGL Window"); |
| 112 setup(); | |
| 113 glutDisplayFunc(display); | |
| 8 | 114 glutKeyboardFunc(keyboard); |
| 115 glutIdleFunc(idle); | |
| 0 | 116 glutMainLoop(); |
| 117 | |
| 7 | 118 free(rectangles); |
| 119 | |
| 0 | 120 return 0; |
| 121 } | |
| 7 | 122 |
| 123 |