#include ".\plot.h"

CPlot::CPlot(void)
{
	m_yMin = 0;
    m_yMax = 127;
    m_xMin = 0;
    m_xMax = 1023;
    m_xPixels = m_yPixels = 1000000;
}

CPlot::~CPlot(void)
{
}

// Translate position (0 .. MAX_CHANNELS) to pixel

inline int CPlot::PositionToPixel(double pos)
{
    return((int)(m_xPixels * double(pos - (m_xMin + 0.5f)) / double(m_xMax - m_xMin) + 0.5f));
}
    
inline double CPlot::PixelToPosition(int pixel)
{
    return(m_xMin + double(pixel) * double(m_xMax - m_xMin) / m_xPixels);
}

void CPlot::MovePlot(int xmin, int xmax, unsigned long ymin, unsigned long ymax)
{
    int xmi = xmin;
    int xma = xmax;
    int dx = xmax - xmin;
    if (dx < MIN_PLOT_CHANNELS - 1)
        dx = MIN_PLOT_CHANNELS - 1;
    else if (dx >= MAX_CHANNELS)
        dx = MAX_CHANNELS - 1;
    if (xmi < 0)
        xmi = 0;
    xma = xmi + dx;
    if (xma >= MAX_CHANNELS)
    {
        xma = MAX_CHANNELS - 1;
        xmi = xma - dx;
    }
    if (int(m_xMin) != xmi || int(m_xMax) != xma)
    {
        m_xMin = xmi;
        m_xMax = xma;
    }
}