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[lsystem3d.git] / src / model.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 <vector>

#include "GL/gl.h"
#include "GL/glu.h"

#include "color.h"
#include "model.h"
#include "vector.h"

using namespace std;



/**
 * Constructor
 */
Model::Model()
{
    // default color table
    Color brown(0.5, 0.2, 0.0);    _colorTable.push_back(brown);
    Color white(1.0, 1.0, 1.0);    _colorTable.push_back(white);
    Color green(0.0, 0.5, 0.0);    _colorTable.push_back(green);    
    
    _displayList = 0;
    
    clear();
}



/**
 * Destructor
 */
Model::~Model()
{
    glDeleteLists(_displayList, 1);
}



/**
 * Create a segment
 * @param x1 x start point
 * @param y1 y start point
 * @param z1 z start point
 * @param x2 x end point
 * @param y2 y end point
 * @param z2 z end point
 */
void Model::segment(double x1, double y1, double z1, double x2, double y2, double z2)
{
    // find rotation vector and angle
    
    Vector initial(0.0,   1.0,   0.0);      // initial rotation of cylinder
    Vector desired(x2-x1, y2-y1, z2-z1);    // desired rotation of cylinder
    desired.normalize();
    
    // rotation angle 
    double rotationAngle = initial.getAngle(desired);
    
    // rotation vector
    Vector rotationVector = initial.getCrossProduct(desired);
    rotationVector.normalize();
    
    
    // render the cylinder
    
    static GLUquadric *quadric = gluNewQuadric();
    
    glPushMatrix();
        glTranslatef(x1, y1, z1);
        glRotatef(rotationAngle, rotationVector.getX(), rotationVector.getY(), rotationVector.getZ());
        glRotatef(-90, 1, 0, 0);
        
        gluCylinder(quadric, _diameter, _diameter, 1.0, 6, 6);
    glPopMatrix();
}



/**
 * Specify a vertex
 * @param x x-coordinate
 * @param y y-coordinate
 * @param z z-coordinate
 */
void Model::vertex(double x, double y, double z)
{
    glVertex3d(x, y, z);
}



/**
 * Specify a normal
 * @param x x-coordinate
 * @param y y-coordinate
 * @param z z-coordinate
 */
void Model::normal(double x, double y, double z)
{
    glNormal3f(x, y, z);
}



/**
 * Render to screen
 */
void Model::draw()
{
    glCallList(_displayList);
}



/**
 * Clear the model
 */
void Model::clear()
{
    glDeleteLists(_displayList, 1);
    _displayList = glGenLists(1);
    
    setColorIndex(0);
    
    _diameter = 0.1;
    _diameterFactor = 0.8;
}



/**
 * Begin a modelling session
 */
void Model::begin()
{
    glNewList(_displayList, GL_COMPILE);
}



/**
 * End a modelling session
 */
void Model::end()
{
    glEndList();
}



/**
 * Begin creation of a filled polygon
 */
void Model::fillBegin()
{
    glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
    
    glBegin(GL_POLYGON);
}



/**
 * End creation of a filled polygon
 */
void Model::fillEnd()
{
    glEnd();
    
    glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
}



/**
 * Increment current index to color table
 */
void Model::nextColor()
{
    setColorIndex(_colorIndex + 1);
}



/**
 * Decrement current index to color table
 */
void Model::prevColor()
{
    setColorIndex(_colorIndex - 1);
}



/**
 * Decrement diameter of segment
 */
void Model::decrementDiameter()
{
    _diameter *= _diameterFactor;
}



/**
 * Set current color index
 * @param index the color index
 */
void Model::setColorIndex(int index)
{
    // keep in range
    
    if (index < 0)
    {
        _colorIndex = _colorTable.size() - 1;
    }
    else if (index > (_colorTable.size() - 1))
    {
        _colorIndex = 0;
    }
    else
    {
        _colorIndex = index;
    }
    
    
    // set color
    
    Color color = _colorTable[_colorIndex];
    double r = color.getR();
    double g = color.getG();
    double b = color.getB();
    
    glColor3f(r, g, b);
}



/**
 * Set current diameter of segment
 * @param diameter the diameter
 */
void Model::setDiameter(double diameter)
{
    _diameter = diameter;
}



/**
 * Set diameter factor
 * @param diameter the diameter factor
 */
void Model::setDiameterFactor(double diameterFactor)
{
    _diameterFactor = diameterFactor;
}



/**
 * Get current color index
 * @return color index
 */
int Model::getColorIndex()
{
    return _colorIndex;
}



/**
 * Get current diameter of segment
 * @return diameter of segment
 */
double Model::getDiameter()
{
    return _diameter;
}