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[lsystem3d.git] / src / renderingsurface.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 <GL/gl.h>
#include <GL/glu.h>

#include "fx.h"
#include "fx3d.h"

#include "renderingsurface.h"



// message map
FXDEFMAP(RenderingSurface) RenderingSurfaceMap[] =
{
    FXMAPFUNC(SEL_LEFTBUTTONPRESS,     RenderingSurface::ID_CANVAS, RenderingSurface::onLeftMouseDown),
    FXMAPFUNC(SEL_LEFTBUTTONRELEASE,   RenderingSurface::ID_CANVAS, RenderingSurface::onLeftMouseUp),
    FXMAPFUNC(SEL_MIDDLEBUTTONPRESS,   RenderingSurface::ID_CANVAS, RenderingSurface::onMiddleMouseDown),
    FXMAPFUNC(SEL_MIDDLEBUTTONRELEASE, RenderingSurface::ID_CANVAS, RenderingSurface::onMiddleMouseUp),
    FXMAPFUNC(SEL_RIGHTBUTTONPRESS,    RenderingSurface::ID_CANVAS, RenderingSurface::onRightMouseDown),
    FXMAPFUNC(SEL_RIGHTBUTTONRELEASE,  RenderingSurface::ID_CANVAS, RenderingSurface::onRightMouseUp),
    FXMAPFUNC(SEL_MOTION,              RenderingSurface::ID_CANVAS, RenderingSurface::onMouseMove),
    FXMAPFUNC(SEL_PAINT,               RenderingSurface::ID_CANVAS, RenderingSurface::onRepaint)
};

// macro to set up class implementation
FXIMPLEMENT(RenderingSurface, FXMainWindow, RenderingSurfaceMap, ARRAYNUMBER(RenderingSurfaceMap))



/**
 * Constructor
 * @param application the FOX application object
 * @param lsystem the Lindenmayer-system
 */
RenderingSurface::RenderingSurface(FXApp *application, LindenmayerSystem *lsystem) : FXMainWindow(application, "LSystem3D", NULL, NULL, DECOR_ALL, 100, 100, 800, 800)
{
    _lsystem = lsystem;
    
    _modelX =   0.0;
    _modelY =   0.0;
    _modelZ = -10.0;
    
    _modelRotationY = 0.0;
    
    _leftMouseDown = _rightMouseDown = _middleMouseDown = false;
   
   
    // pixel format info
    _visual = new FXGLVisual(getApp(), VISUAL_DOUBLEBUFFER);
    
    // OpenGL drawing area
    FXVerticalFrame *mainFrame = new FXVerticalFrame(this, LAYOUT_FILL_X | LAYOUT_FILL_Y);
    _canvas = new FXGLCanvas(mainFrame, _visual, this, ID_CANVAS, LAYOUT_FILL_X | LAYOUT_FILL_Y);
}



/**
 * Create and initialize the window
 */
void RenderingSurface::create()
{
    // create the window
    FXMainWindow::create();
    
    // set up OpenGL
    _canvas->makeCurrent();
    initOpenGL();
    
    // make the window appear
    show();
}



/**
 * Initialize OpenGL
 */
void RenderingSurface::initOpenGL()
{
    // projection matrix
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(65, 1, 1, 500);
        
    // modelview matrix
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    
    
    // global ambient light
    GLfloat ambientLight[] = {0.7, 0.7, 0.7, 1.0};
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight);

    // diffuse light
    GLfloat lightPosition[] = {150.0, 150.0, 0.0, 0.0};
    GLfloat whiteLight[] = {1.0, 1.0, 1.0, 1.0};
    glLightfv(GL_LIGHT0, GL_DIFFUSE, whiteLight);
    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);

    
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glEnable(GL_DEPTH_TEST);
}



/**
 * Force an update of the rendering surface
 */
void RenderingSurface::draw()
{
    _canvas->update();
}



/**
 * Called by the system when the left mouse button is pressed
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onLeftMouseDown(FXObject *sender, FXSelector selector, void *data)
{
    _leftMouseDown = true;
}



/**
 * Called by the system when the left mouse button is released
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onLeftMouseUp(FXObject *sender, FXSelector selector, void *data)
{
    _leftMouseDown = false;
}



/**
 * Called by the system when the middle mouse button is pressed
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onMiddleMouseDown(FXObject *sender, FXSelector selector, void *data)
{
    _middleMouseDown = true;
}



/**
 * Called by the system when the middle mouse button is released
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onMiddleMouseUp(FXObject *sender, FXSelector selector, void *data)
{
    _middleMouseDown = false;
}



/**
 * Called by the system when the right mouse button is pressed
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onRightMouseDown(FXObject *sender, FXSelector selector, void *data)
{
    _rightMouseDown = true;
}



/**
 * Called by the system when the right mouse button is released
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onRightMouseUp(FXObject *sender, FXSelector selector, void *data)
{
    _rightMouseDown = false;
}



/**
 * Called by the system when the mouse is moved
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onMouseMove(FXObject *sender, FXSelector selector, void *data)
{
    // check status of the mouse buttons and move model
    
    // left mouse button
    if (_leftMouseDown)
    {
        // move in z-plane
        
        FXEvent *event = (FXEvent*)data;
        
        // TODO: "gluPerspective(65, 1, 1, 500)" -> "translateFactor = 610.0 / (-_modelZ)", ugly...
        double translateFactor = 610.0 / (-_modelZ);
        
        _modelX +=  (event->win_x - event->last_x) / translateFactor;
        _modelY += -(event->win_y - event->last_y) / translateFactor;
        
        _canvas->update();
    }
    
    // middle mouse button
    if (_middleMouseDown)
    {
        // zoom in/out
        
        FXEvent *event = (FXEvent*)data;
        
        _modelZ +=  -(event->win_y - event->last_y) / 10.0;
        
        // stop zooming at -1.0
        if (_modelZ >= -1.0)
        {
            _modelZ = -1.0;
        }

        _canvas->update();
    }
    
    // right mouse button
    if (_rightMouseDown)
    {
        // rotate around y-axis
        
        FXEvent *event = (FXEvent*)data;

        _modelRotationY = ((int)_modelRotationY + event->win_x - event->last_x) % 360;
        
        _canvas->update();
    }
}



/**
 * Called by the system when the rendering surface needs a repaint
 * @param sender the sender object
 * @param selector message type and id
 * @param data event related data
 * @return 
 */
long RenderingSurface::onRepaint(FXObject *sender, FXSelector selector, void *data)
{
    glMatrixMode (GL_MODELVIEW);
    glLoadIdentity();
    
    
    // clear scene
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    // position and orientation of model
    glTranslatef(_modelX, _modelY, _modelZ);
    glRotatef(_modelRotationY, 0.0, 1.0, 0.0);
    
    // render model
    _lsystem->getModel()->draw();
        
    
    // make it appear
    _canvas->swapBuffers();
}