ui_SceneRuler.cpp

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#include "ui_SceneRuler.hpp"

Ruler::Ruler()
: mpFont( new Font() )
, mSize(20.0)
, mLeft(0)
, mWidth(1)
, mTick(0.5)
, mVisible(true)
{
}

void Ruler::display()
{
  if (mVisible)
  {
    setupViewport();
    setupTransformationScreen();

    glPushAttrib(GL_ENABLE_BIT|GL_SCISSOR_BIT);

    glEnable(GL_BLEND);
    glEnable(GL_SCISSOR_TEST);

    {
      int x = (mViewport[0]+mSize < 0) ? 0 : mViewport[0]+mSize;
      int y = (mViewport[1] < 0) ? 0 : mViewport[1];
      int w = (mViewport[2]-mSize < 0) ? 0 : mViewport[2]-mSize;
      int h = (mViewport[3] < 0) ? 0 : mViewport[3];

      glScissor(x,y,w,h);
    }

    glColor4d(1.0,1.0,0.0,0.5);
    glRectd(0,0,width()-1,mSize);
    glColor4d(0.0,0.0,0.0,0.9);
    
    {
      double rest = fmod( mLeft, mTick );

      int n( mWidth / mTick );
      double xbase = mLeft - rest;

      glMatrixMode(GL_MODELVIEW);
      glPushMatrix();
      glScaled( width() / mWidth, 1, 1);
      glTranslated( -mLeft, 0, 0 );



      for (int i = -1; i <= n+1; ++i ) 
      {  
        double x = xbase+i*mTick;
        glBegin(GL_LINES);
        glVertex2d(x,mSize*0.5);
        glVertex2d(x,mSize);
        glEnd();
        char buf[32];
        sprintf(buf, "%g", x);
        double w = mpFont->computeWidth(buf);

        double shift = w*0.5 * ( mWidth / width() );

        glRasterPos2d(x-shift,0);
        mpFont->draw(buf);
      }
      glPopMatrix();
    }

    {
      int x = (mViewport[0] < 0) ? 0 : mViewport[0];
      int y = (mViewport[1]+mSize < 0) ? 0 : mViewport[1]+mSize;
      int w = (mViewport[2] < 0) ? 0 : mViewport[2];
      int h = (mViewport[3]-mSize < 0) ? 0 : mViewport[3]-mSize;

      glScissor(x,y,w,h);
    }
    glColor4d(1.0,1.0,0.0,0.5);
    glRectd(0,0,mSize,height()-1);
    glColor4d(0.0,0.0,0.0,0.9);

    {
      double rest = fmod( mBottom, mTick );

      int n( mHeight / mTick );
      double ybase = mBottom - rest;

      glMatrixMode(GL_MODELVIEW);
      glPushMatrix();
      glScaled( 1, height() / mHeight, 1);
      glTranslated( 0, -mBottom, 0 );

      double shift = mpFont->getDescender() * 0.5 * (mWidth / width() );

      for (int i = -1; i <= n+1; ++i ) 
      {  
        double y = ybase+i*mTick;
        glBegin(GL_LINES);
        glVertex2d(mSize*0.5,y);
        glVertex2d(mSize,y);
        glEnd();
        char buf[32];
        sprintf(buf, "%2.2g", y);
        glRasterPos2d(0,y-shift);
        mpFont->draw(buf);
      }
      glPopMatrix();
    }



    glPopAttrib();
  }
}