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trackball.h
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trackball.h
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/*
* Simple trackball-like motion adapted (ripped off) from projtex.c
* (written by David Yu and David Blythe). See the SIGGRAPH '96
* Advanced OpenGL course notes.
*
*
* Usage:
*
* o call tbInit() in before any other tb call
* o call tbReshape() from the reshape callback
* o call tbMatrix() to get the trackball matrix rotation
* o call tbStartMotion() to begin trackball movememt
* o call tbStopMotion() to stop trackball movememt
* o call tbMotion() from the motion callback
* o call tbAnimate(GL_TRUE) if you want the trackball to continue
* spinning after the mouse button has been released
* o call tbAnimate(GL_FALSE) if you want the trackball to stop
* spinning after the mouse button has been released
*
* Typical setup:
*
*
void init(void)
{
tbInit(GLUT_RIGHT_BUTTON);
tbAnimate(GL_TRUE);
. . .
}
void reshape(int width, int height)
{
tbReshape(width, height);
. . .
}
void display(void)
{
glPushMatrix();
tbMatrix();
. . . draw the scene . . .
glPopMatrix();
}
void mouse(int button, int state, int x, int y)
{
tbMouse(button, state, x, y);
. . .
}
void motion(int x, int y)
{
tbMotion(x, y);
. . .
}
int main(int argc, char** argv)
{
. . .
init();
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(motion);
. . .
}
*
* */
/* functions */
void tbInit(GLuint button);
void tbMatrix();
void tbMatrixForSelection();
void tbReshape(int width, int height);
void tbMouse(int button, int state, int x, int y);
void tbMotion(int x, int y);
void tbAnimate(GLboolean animate);