LinePrimitive.cpp

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// Copyright (C) 2005 Dave Griffiths
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "Renderer.h"
#include "LinePrimitive.h"
#include "State.h"

using namespace Fluxus;

LinePrimitive::LinePrimitive() 
{   
    AddData("p",new TypedPData<dVector>);
    AddData("w",new TypedPData<float>);
    PDataDirty();
}

LinePrimitive::LinePrimitive(const LinePrimitive &other) :
Primitive(other) 
{
    PDataDirty();
}

LinePrimitive::~LinePrimitive()
{
}

LinePrimitive* LinePrimitive::Clone() const 
{
    return new LinePrimitive(*this); 
}

void LinePrimitive::PDataDirty()
{
    // reset pointers
    m_VertData=GetDataVec<dVector>("p");
    m_WidthData=GetDataVec<float>("w");
}

void LinePrimitive::Render()
{
    if (m_VertData->size()<2) return;
    
    dMatrix ModelView;
    glGetFloatv(GL_MODELVIEW_MATRIX,ModelView.arr());

    if (m_State.Hints & HINT_UNLIT) glDisable(GL_LIGHTING);
    if (m_State.Hints & HINT_AALIAS) glEnable(GL_LINE_SMOOTH);      
    
    if (m_State.Hints & HINT_SOLID)
    {
        dVector CameraDir(0,0,1);
        CameraDir=ModelView.inverse().transform_no_trans(CameraDir);
        CameraDir.normalise();

        glBegin(GL_TRIANGLE_STRIP);

        for (unsigned int n=0; n<m_VertData->size()-1; n++)
        {
            float txstart = n/(float)m_VertData->size();
            float txend = (n+1)/(float)m_VertData->size();
        
            dVector line=(*m_VertData)[n+1]-(*m_VertData)[n];
            dVector up=line.cross(CameraDir);
            up.normalise();

            dVector topnorm=up;
            dVector botnorm=-up;

            glTexCoord2f(txstart,0);
            glNormal3fv(botnorm.arr());
            glVertex3fv(((*m_VertData)[n]-(up*(*m_WidthData)[n])).arr());
            glTexCoord2f(txstart,1);
            glNormal3fv(topnorm.arr());
            glVertex3fv(((*m_VertData)[n]+(up*(*m_WidthData)[n])).arr());
            glTexCoord2f(txend,0);
            glNormal3fv(botnorm.arr());
            glVertex3fv(((*m_VertData)[n+1]-(up*(*m_WidthData)[n+1])).arr());
            glTexCoord2f(txend,1);
            glNormal3fv(topnorm.arr());
            glVertex3fv(((*m_VertData)[n+1]+(up*(*m_WidthData)[n+1])).arr());
        }
        glEnd();

    }
    
    if (m_State.Hints & HINT_WIRE)
    {
        glBegin(GL_LINE_STRIP);
        for (unsigned int n=0; n<m_VertData->size()-1; n++)
        {
            float txstart = n/(float)m_VertData->size();
            float txend = (n+1)/(float)m_VertData->size();
            glTexCoord2f(txstart,0);
            glVertex3fv((*m_VertData)[n].arr());
            glTexCoord2f(txend,0);
            glVertex3fv((*m_VertData)[n+1].arr());
        }
        glEnd();
    }
    
    if (m_State.Hints & HINT_AALIAS) glDisable(GL_LINE_SMOOTH);     
    if (m_State.Hints & HINT_UNLIT) glEnable(GL_LIGHTING);
}

dBoundingBox LinePrimitive::GetBoundingBox()
{
    dBoundingBox box;
    for (unsigned int n=0; n<m_VertData->size()-1; n++)
    {
        box.expand((*m_VertData)[n]);
    }
    return box;
}

void LinePrimitive::ApplyTransform(bool ScaleRotOnly)
{
    if (!ScaleRotOnly)
    {
        for (vector<dVector>::iterator i=m_VertData->begin(); i!=m_VertData->end(); ++i)
        {
            *i=GetState()->Transform.transform(*i);
        }
    }
    else
    {
        for (vector<dVector>::iterator i=m_VertData->begin(); i!=m_VertData->end(); ++i)
        {
            *i=GetState()->Transform.transform_no_trans(*i);
        }
    }
    
    GetState()->Transform.init();
}

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