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[lsystem3d.git] / src / callbacks.cpp

// Copyright (C) 2006 Erik Dahlberg
// 
// This file is part of LSystem3d.
// 
// LSystem3D is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// LSystem3D is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with LSystem3D; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA




#include <unistd.h>

#include <GL/freeglut.h>

#include "callbacks.h"
#include "openglwindow.h"

extern OpenGLWindow *openglWindow;



// GLUT callback functions
// -----------------------

/**
 * Key press
 * @param key the key
 * @param x mouse x-coordinate
 * @param y mouse y-coordinate
 */
void glutKeyboardCB(unsigned char key, int x, int y)
{
    switch (key)
    {
        // quit
        case 27:    // escape key
            glutLeaveMainLoop();
            break;
    
        // zoom in
        case '+':
            openglWindow->zoomIn();
            break;
    
        // zoom out    
        case '-':
            openglWindow->zoomOut();
            break;
            
        // rotate around the y-axis
        case 'y':
        case 'Y':
            openglWindow->rotateY();
    
        default:
            break;
    }
}



/**
 * Special key press
 * @param key the key
 * @param x mouse x-coordinate
 * @param y mouse y-coordinate
 */
void glutSpecialCB(int key, int x, int y)
{
    switch (key)
    {
        // move camera left
        case GLUT_KEY_LEFT:
            openglWindow->left();
            break;
    
        // move camera right
        case GLUT_KEY_RIGHT:
            openglWindow->right();
            break;
    
        // move camera up
        case GLUT_KEY_UP:
            openglWindow->up();
            break;
    
        // move camera down
        case GLUT_KEY_DOWN:
            openglWindow->down();
            break;
            
        // move camera forth
        case GLUT_KEY_PAGE_UP:
            openglWindow->forth();
            break;
            
        // move camera back
        case GLUT_KEY_PAGE_DOWN:
            openglWindow->back();
            break;
    
        default:
            break;
    }
}



/**
 * Redraw of screen
 */
void glutDisplayCB()
{
    openglWindow->draw();
}



/**
 * Idling
 */
void glutIdleCB()
{
    // spare some cpu cycles
    usleep(1);
}



// GLUI callback functions
// -----------------------

/**
 * Angle changes
 * @param id not used
 */
void gluiSpinnerAngleCB(int id)
{
    // regenerate and draw l-system only if "live mode" is enabled
    
    if (openglWindow->liveActivated())
    {
        openglWindow->generate();
        glutPostRedisplay();
    }
}



/**
 * Reset button pressed
 * @param id not used
 */
void gluiButtonResetCB(int id)
{
    // place camera at initial position
    openglWindow->defaultView();
}



/**
 * Generate button pressed
 * @param id not used
 */
void gluiButtonGenerateCB(int id)
{
    openglWindow->generate();
}