GaugeValueAxis.h

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//==============================================================================================
//  FILENAME    :   GaugeValueAxis.h
//  AUTHOR      :   Liang Liu
//  CREATION    :   2009-03-02
//  Copyright (C) MicroStrategy Incorporated 2009
//  All Rights Reserved
//==============================================================================================
#ifndef MsiChart_GaugeValueAxis_h
#define MsiChart_GaugeValueAxis_h

#include "ValueAxis.h"

namespace MsiChart
{
    // The distance between the center and the tip of grid line will be mRadius - mRadius / gGridLineMarginFactor.
    extern const Int32 gGridLineMarginFactor;

    // The length of grid line will be mRadius / gGridLineLengthFactor.
    extern const Int32 gGridLineLengthFactor;

    class GaugeValueAxis: public ValueAxis
    {
    public:
        typedef MSynch::SmartPtr<GaugeValueAxis> Ptr;
        
        GaugeValueAxis(const TripleId& irTripleId, 
            GraphObjectManager* ipManager, 
            double iMin, 
            double iMax,
            Int32 iStartAngle,
            Int32 iStopAngle,
            float iRadius,
            bool iUseOldStyle,
            bool iDrawLabelsOutside); 
        virtual ~GaugeValueAxis();
            
        // Override methods
        virtual void GenerateMapAndList();

        void GenerateGridLines(const Point2D& irCenter);
        void GenerateLabels(const Point2D& irCenter);
                
        float ValueToAngle(double iValue) const;    

        bool ValueToAngle(double iValue, float& orAngle) const;

    protected:  
        virtual void hCreateOneTickLabel(const TripleId& irTripleId, double iTickValue);
        
        virtual double hComputeStep(double iMaximum, double iMinimum, bool iIncludeZero);

        float mStartAngle;      
        float mStopAngle;       
        float mRadius;          
        Point2D mCenter;        
        bool mUseOldStyle;      
        bool mDrawLabelsOutside;

    private:
        void hCreateOneGridLine(const TripleId& irTripleId, double iTickValue, GraphCollectionObject* ipGridLineSet);
        
        Point2D hGetPointByAngleAndRadius(double iAngleRad, double iRadius) const;  

        void hAdjustLabelCenterByAngle(Point2D& iorLabelCenter, Int32 iLabelWidth, float iAngle) const;
    };  
    
}
#endif