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Plot2D.cc

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/*
    File:           Plot2D.cc

    Function:       See header file

    Author(s):      Andrew Willmott

    Copyright:      (c) 1995-2000, Andrew Willmott

    Notes:          

*/

#include "gcl/Plot2D.h"

scPlot2D::scPlot2D() : scPrimitive(pPoly), plotType(plotStep)
{
    samples.SetSize(10, 10);
    samples.MakeZero();
}
 
StrConst scPlot2D::Label() const
{
    return("2D Plot");
}

Void scPlot2D::Draw(Renderer &r, SLContext *context)
{
    Int         i, j;
    Point       pos0, pos1, pos2, pos3;
    Vector      dx, dz, normal;
    Colour      col = *(SC_GET(Colour));
                
    r.MakeCurrent();

    if (plotType != plotStep)
    {
        dx = Vector(2.0 / (samples.Cols() - 1), 0, 0);
        dz = Vector(0, 0, 2.0 / (samples.Rows() - 1));

        pos0[2] = -1;
        
        for (i = 0; i < samples.Rows() - 1; i++)
        {
            pos0[0] = -1;
            pos1 = pos0 + dz;
            
            for (j = 0; j < samples.Cols() - 1; j++)
            {
                pos3 = pos0 + dx;
                pos2 = pos1 + dx;
                pos0[1] = samples[i][j] + 0.01;
                pos1[1] = samples[i + 1][j] + 0.01;
                pos2[1] = samples[i + 1][j + 1] + 0.01;
                pos3[1] = samples[i][j + 1] + 0.01;
                
                normal = norm(cross(pos1 - pos0, pos3 - pos0)); 
                
                r.N(norm(normal));
                r.C(col).Begin(sRenderStyle)
                    .P(pos0).P(pos1).P(pos2).P(pos3)
                    .End();

                pos0 += dx;
                pos1 += dx;
            }
            
            pos0 += dz;
        }
    }
    else
    {
        dx = Vector(2.0 / samples.Cols(), 0, 0);
        dz = Vector(0, 0, 2.0 / samples.Rows());

        pos0[2] = -1;
        
        for (i = 0; i < samples.Rows(); i++)
        {
            pos0[0] = -1;
            pos1 = pos0 + dz;
            
            for (j = 0; j < samples.Cols(); j++)
            {
                pos3 = pos0 + dx;
                pos2 = pos1 + dx;
                pos0[1] = pos1[1] = pos2[1] = pos3[1] = samples[i][j];
            
                r.Begin(renPoly).P(pos0).P(pos1).P(pos2).P(pos3).End();
            
                pos0 += dx;
                pos1 += dx;
            }
            
            pos0 += dz;
        }
    }
}
  

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