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PlotNeedle.h

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// Author: Richard van Balen
// Interactive needle for a Plot.

#ifndef Impala_Visualisation_Plot_PlotNeedle_h
#define Impala_Visualisation_Plot_PlotNeedle_h

#include "Link/OGL/OGLWnd.h"
#include "Visualization/Plot/Line.h"
#include "Visualization/Plot/PlotNeedleListener.h"

namespace Impala {
namespace Visualization {
namespace Plot {

class PlotNeedle : public Line
{
public:
    PlotNeedle(double minX, double maxX, double x, double top, double bottom) :
        Line(0.0, false)
    {
        Init(minX, maxX, x, top, bottom);
    }

    void SetPlotNeedleListener(PlotNeedleListener* li, void* userData)
    {
        mListener = li;
        mListenerData = userData;
    }

    double Value()
    {
        return mX;
    }

    void SetTopBottom(double top, double bottom)
    {
        mNeedleData[0] = top;
        mNeedleData[1] = bottom;
        SetData((double *) &mNeedleData,2);
    }

    void SetMinMaxX(double minX, double maxX)
    {
        mNeedleMinX = minX;
        mNeedleMaxX = maxX;
    }

    void SetRoundOffset(double rOff)
    {
        mRoundOffset = rOff;
    }

    void MoveTo(double x)
    {
        if (mX == x)
            return;
        mX = x;
        if (mX < mNeedleMinX)
            mX = mNeedleMinX;
        if (mX > mNeedleMaxX)
            mX = mNeedleMaxX;
        SetDomain(mX, mX);
        if (mListener)
        {
            printf("PlotNeedle to listener: %f\n", mX);
            mListener->PlotNeedleChanged(this, mX, mListenerData);
        }
    }

    virtual void
    OnMouse(double x, double y, int msg, int but, int state)
    {
        if (state & (oglShift | oglControl))
            return;

        if (msg == oglMouseDown && but == oglLeftButton)
        {
            mDragging = true;
            MoveTo(x+mRoundOffset);
        }
        if (mDragging && msg == oglMouseMove && (state & oglLeftButton))
            MoveTo(x+mRoundOffset);

        if (!(state & oglLeftButton) && mDragging)
            mDragging = false;
    }

private:
    void Init(double minX, double maxX, double x, double top, double bottom)
    {
        mListener = 0;
        mX = x;
        SetMinMaxX(minX,maxX);
        SetTopBottom(top, bottom);
        mRoundOffset = 0.0;
        mDragging = false;
    }

    PlotNeedleListener* mListener;
    void*               mListenerData;

    double  mNeedleData[2];
    double  mX, mNeedleMinX, mNeedleMaxX;
    double  mRoundOffset;
    bool    mDragging;
};

}//namespace Plot
}//namespace Visualization
}//namespace Impala

#endif Impala_Visualisation_Plot_Line_h

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