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/* Copyright (c) Mark J. Kilgard, 1994. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glut.h>
int *dials, *buttons;
int numdials, numbuttons;
int dw, bw;
/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
void
drawCircle(int x, int y, int r, int dir)
{
float angle;
glPushMatrix();
glTranslatef(x,y,0);
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0,0);
for(angle = 2*M_PI; angle >= 0; angle -= M_PI/12) {
glVertex2f(r*cos(angle),r*sin(angle));
}
glEnd();
glColor3f(0,0,1);
glBegin(GL_LINES);
glVertex2f(0,0);
glVertex2f(r*cos(dir*M_PI/180),r*sin(dir*M_PI/180));
glEnd();
glPopMatrix();
}
void
displayDials(void)
{
int i;
glClear(GL_COLOR_BUFFER_BIT);
for(i=0;i<numdials;i++) {
glColor3f(0, 1, 0);
drawCircle(100 + (i%2) * 100, 100 + (i/2) * 100, 40, -dials[i]+90);
}
glutSwapBuffers();
}
void
displayButtons(void)
{
int i, n;
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_QUADS);
for(i=0,n=0;i<32;i++,n++) {
switch(n) {
case 0:
case 5:
case 30:
n++;
}
if(buttons[i]) {
glColor3f(1,0,0);
} else {
glColor3f(1,1,1);
}
glVertex2f((n%6)*40+10,(n/6)*40+10);
glVertex2f((n%6)*40+30,(n/6)*40+10);
glVertex2f((n%6)*40+30,(n/6)*40+30);
glVertex2f((n%6)*40+10,(n/6)*40+30);
}
glEnd();
glutSwapBuffers();
}
void
reshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, w, 0, h);
if(glutGetWindow() == bw) {
glScalef(1, -1, 1);
glTranslatef(0, -h, 0);
}
glMatrixMode(GL_MODELVIEW);
}
void
dodial(int dial, int value)
{
dials[dial - 1] = value % 360;
glutPostWindowRedisplay(dw);
}
void
dobutton(int button, int state)
{
if(button <= numbuttons) {
buttons[button-1] = (state == GLUT_DOWN);
glutPostWindowRedisplay(bw);
}
}
int
main(int argc, char **argv)
{
glutInit(&argc, argv);
numdials = glutDeviceGet(GLUT_NUM_DIALS);
if(numdials <= 0) {
fprintf(stderr, "dials: No dials available\n");
exit(1);
}
numbuttons = glutDeviceGet(GLUT_NUM_BUTTON_BOX_BUTTONS);
dials = (int*) calloc(numdials, sizeof(int));
buttons = (int*) calloc(numbuttons, sizeof(int));
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(300, ((numdials+1)/2) * 100 + 100);
dw = glutCreateWindow("GLUT dials");
glClearColor(0.5, 0.5, 0.5, 1.0);
glLineWidth(3.0);
glutDialsFunc(dodial);
glutButtonBoxFunc(dobutton);
glutDisplayFunc(displayDials);
glutReshapeFunc(reshape);
glutInitWindowSize(240, 240);
bw = glutCreateWindow("GLUT button box");
glClearColor(0.5, 0.5, 0.5, 1.0);
glutDisplayFunc(displayButtons);
glutReshapeFunc(reshape);
glutDialsFunc(dodial);
glutButtonBoxFunc(dobutton);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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