src/Histogram.cpp

Go to the documentation of this file.

#include "Histogram.h"


Histogram::Histogram(QWidget* parent /*= 0*/) : QWidget(parent)
{
  m_parent = parent;
        showHistogram = false;
  m_histogram = QImage (321,71, QImage::Format_RGB32);
}


Histogram::~Histogram()
{
}

void Histogram::paintEvent(QPaintEvent* event)
{
  QPainter p(this);

  if(showHistogram)
  {
    float xTick = width() / (float) DENSITY_COUNT;
    float xStep = 0.0f;
    float yStep = 0.0f;

    // Move coordinate system origin from upper left to lower left
    p.translate(0, size().height());

    for(int i = 0; i < DENSITY_COUNT; i++)
    {
      if(m_density[i] != 0)
      {
        yStep = m_density[i]/100; // * paintSize.height();
      }
      else
      {
        yStep = 0.0f;
      }

      p.drawLine(xStep, 0, xStep, -yStep );
      xStep += xTick;
    }
  }
  else
  {
    printf("size: %d, %d\n", width(), height());
    p.drawRect(0, 0, width() -1, height() -1 );
  }

}


void Histogram::Show(const int* density) 
{ 
    //for(int i = 0; i < DENSITY_COUNT; i++)
    //{
    //  printf("%d ", density[i]);
    //}

    m_density = (int*) density;
    showHistogram = true;

    m_parent->update();
  }



void Histogram::Clear() 
{ 
  showHistogram = false;
  printf("Clear histogram\n"); 

  m_parent->update();
}

---