/*
 * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
 * Distributed under the terms of the MIT License.
 */
#ifndef CHART_LEGEND_H
#define CHART_LEGEND_H

#include <Point.h>
#include <Size.h>


class BView;
class ChartDataRange;


class ChartLegend {
public:
                                                                ChartLegend(int32 level = 0);
                                                                        // A lower level means more likely to be
                                                                        // shown. <= 0 is mandatory.
        virtual                                         ~ChartLegend();

                        int32                           Level()         { return fLevel; }

private:
                        int32                           fLevel;
};


class ChartLegendRenderer {
public:
        virtual                                         ~ChartLegendRenderer();

        virtual void                            GetMinimumLegendSpacing(BView* view,
                                                                        float* horizontal, float* vertical) = 0;

        virtual BSize                           LegendSize(ChartLegend* legend,
                                                                        BView* view) = 0;
        virtual void                            RenderLegend(ChartLegend* legend, BView* view,
                                                                        BPoint point) = 0;
};


#endif  // CHART_LEGEND_H