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xygridlog.cpp

Go to the documentation of this file.

/*****************************************************************************/
/* Módulo: xygridlog.cpp                                                     */
/*****************************************************************************/

#include <stdlib.h>
#include <math.h>
#include <stdio.h>

#include "xygridlog.h"

const char* xy_id_xygridlog_cpp="$Id: xygridlog.cpp,v 1.1 2002/01/23 16:09:37 clinio Exp $";
                                                                
XYGridLog::XYGridLog (double mn, double mx, double p, long color,
double rot, double step, xybool visible) : 
XYGrid(mn, mx, p, color, rot, step, visible)
{
}

XYGridLog::XYGridLog (double mn, double mx, double p, long color,
int style, double rot, double step, xybool visible) : 
XYGrid(mn, mx, p, color, style, rot, step, visible )
{
}

void XYGridLog::draw (int xmin, int ymin, int xmax, int ymax) const
{
   if (visible() == xyfalse) return;
   if (min() <= 0.00001) return;

   int mode = cdClip(CD_CLIPON);        

   // guarda a região de clip corrente
   int oldclip_xmin, oldclip_xmax, oldclip_ymin, oldclip_ymax;
   cdGetClipArea (&oldclip_xmin, &oldclip_xmax, &oldclip_ymin, &oldclip_ymax);
   // define nova região de clip
   // cdClipArea(xmin, xmax, ymin, ymax);

   // ângulo de rotação em radianos
   double rot_rad = _rot * XY_PI / 180.0;

   // (x1, y1) ponto inferior esquerdo no eixo
   double x1, y1;
   position (&x1, &y1);

   // (x2, y2) ponto superior direito no eixo
   double x2 = x1 + _size * cos (rot_rad);
   double y2 = y1 + _size * sin (rot_rad);

   // controle de ponto flutuante
   if (mtEqual(x1, x2)) x2 = x1;
   if (mtEqual(y1, y2)) y2 = y1;

   // desenha eixo com linha sólida mais fina possível e com cor definida
   // pelo usuário
   cdLineWidth (1);
   cdLineStyle (_style);
   cdForeground (_color);


   // desenha a escala se ela foi definida e se passo tem um valor válido
   if (_step > 0.0)
   {
      double xorigin, yorigin;
      position(&xorigin, &yorigin);

      double decade_step;
      for( double val = _mn; val <= _mx; val += decade_step*_step )
      {
        int current_decade = mtDecade(val);
        decade_step = pow( 10, current_decade );
        double dx, dy;
        mtRotate( (log10(val)-log10(_mn))*_size / (log10(_mx)-log10(_mn)), 
              -1, rot_rad, &dx, &dy);

        double other_dx, other_dy;
        mtRotate( (log10(val)-log10(_mn))*_size / (log10(_mx)-log10(_mn)), 
              1, rot_rad, &other_dx, &other_dy);

        double xtick = xorigin + dx;
        double ytick = yorigin + dy;
        
        wdLine( xtick, ytick, xorigin+other_dx, yorigin+other_dy );
      }
      
   }

   cdClip(mode);
   // restaura a região de clip anterior
   cdClipArea(oldclip_xmin, oldclip_xmax, oldclip_ymin, oldclip_ymax);
}

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XY
Tecgraf / PUC-Rio - Computer Graphics Technology Group