1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <iostream>
#include <cmath>
using namespace std;
#define WIDTH 700
#define HEIGHT 600
#define MENUWIDTH 100
#define BOXHEIGHT (HEIGHT/6)
#define NCOLORS 6
#define RGBRED (1, 0, 0)
#define RGBGREEN (0, 1, 0)
#define RGBBLUE (0, 0, 1)
#define RGBYELLOW (1, 1, 0)
#define RGBMAGENTA (1, 0, 1)
#define RGBCYAN (0, 1, 1)
#define RGBWHITE (1, 1, 1)
#define R 0
#define G 1
#define B 2
#define Y 3
#define M 4
#define C 5
static float colormenu[][6 3] = {{RGBRED}, {RGBGREEN}, {RGBBLUE}, {RGBYELLOW}, {RGBMAGENTA}, {RGBCYAN}}; // Note: Still 3 rgb values
const int NCOLORS = sizeof(colormenu) / sizeof(*colormenu); // Note: this calculates the number of colors automatically
int incolormenu(int x, int y)
{
return (x >= 0 && x <= MENUWIDTH && y >= 0 && y <= HEIGHT);
}
int colormenuindex(int x, int y)
{
if(!incolormenu(x, y))
return -1;
else
return(y / BOXHEIGHT);
}
void handleButton(int button, int state, int x, int y)
{
static int menuindex = -1;
y = HEIGHT - y;
if(button != GLUT_LEFT_BUTTON)
return;
if(state == GLUT_DOWN)
{
if(incolormenu(x, y))
menuindex = colormenuindex(x, y);
}
else
{
if(incolormenu(x, y) && colormenuindex(x, y) == menuindex)
{
glColor3f(colormenu[menuindex][R], colormenu[menuindex][G], colormenu[menuindex][B], colormenu[menuindex][C], colormenu[menuindex][M], colormenu[menuindex][Y]); // Note: RGB
glRecti(MENUWIDTH, 0, WIDTH, HEIGHT);
}
glFlush();
}
}
void drawMenu()
{
int i;
glClear(GL_COLOR_BUFFER_BIT);
for(i = 0; i < NCOLORS; i++)
{
glColor3f(colormenu[i][R], colormenu[i][G], colormenu[i][B], colormenu[i][C], colormenu[i][M], colormenu[i][Y]); // Note: RGB
glRecti(1, BOXHEIGHT * i + 1, MENUWIDTH - 1, BOXHEIGHT * (i + 1) - 1);
}
glFlush();
}
int main(int argc, char* argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);
glutInitWindowSize(WIDTH, HEIGHT);
glutCreateWindow("Color Menu");
gluOrtho2D(0, WIDTH, 0, HEIGHT);
glutDisplayFunc(drawMenu);
glutMouseFunc(handleButton);
glClearColor(RGBWHITE, 1, 1, 1);
glutMainLoop();
return 0;
}
|
