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Added d/D keys to change viewing distance, 'a' to toggle animation

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This commit is contained in:
Brian 2008-01-28 12:35:20 -07:00
parent 3bfef64800
commit e7007c6fb0
1 changed files with 29 additions and 6 deletions
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35
progs/demos/gears.c
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@ -27,6 +27,9 @@ static GLint T0 = 0;
static GLint Frames = 0;
static GLint autoexit = 0;
static GLint win = 0;
static GLboolean Visible = GL_TRUE;
static GLboolean Animate = GL_TRUE;
static GLfloat viewDist = 40.0;
/**
@ -179,6 +182,9 @@ draw(void)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(0.0, 0.0, -viewDist);
glRotatef(view_rotx, 1.0, 0.0, 0.0);
glRotatef(view_roty, 0.0, 1.0, 0.0);
glRotatef(view_rotz, 0.0, 0.0, 1.0);
@ -240,6 +246,15 @@ idle(void)
glutPostRedisplay();
}
static void
update_idle_func(void)
{
if (Visible && Animate)
glutIdleFunc(idle);
else
glutIdleFunc(NULL);
}
/* change view angle, exit upon ESC */
/* ARGSUSED1 */
static void
@ -252,6 +267,16 @@ key(unsigned char k, int x, int y)
case 'Z':
view_rotz -= 5.0;
break;
case 'd':
viewDist += 1.0;
break;
case 'D':
viewDist -= 1.0;
break;
case 'a':
Animate = !Animate;
update_idle_func();
break;
case 27: /* Escape */
cleanup();
exit(0);
@ -297,8 +322,6 @@ reshape(int width, int height)
glLoadIdentity();
glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -40.0);
}
static void
@ -351,13 +374,12 @@ init(int argc, char *argv[])
}
}
static void
visible(int vis)
{
if (vis == GLUT_VISIBLE)
glutIdleFunc(idle);
else
glutIdleFunc(NULL);
Visible = vis;
update_idle_func();
}
int main(int argc, char *argv[])
@ -375,6 +397,7 @@ int main(int argc, char *argv[])
glutKeyboardFunc(key);
glutSpecialFunc(special);
glutVisibilityFunc(visible);
update_idle_func();
glutMainLoop();
return 0; /* ANSI C requires main to return int. */