drawable.h

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#ifndef DRAWABLE_H_
#define DRAWABLE_H_

#include <QRect>
#include <QColor>

class QPainter;

struct CADrawSettings {
                float z;       // zoom level
                int x;         // painter x pos in pixels
                int y;         // painter y pos in pixels
                int w;         // canvas width in pixels
                int h;         // canvas height in pixels
                QColor color;  // pen color
                double worldX; // x coordinate of the view
                double worldY; // y coordinate of the view
};

class CADrawable {
public:
        enum CADrawableType {
                DrawableMusElement,
                DrawableContext
        };

        enum CADirection {
                Undefined,
                Top,
                Bottom,
                Left,
                Right,
                TopLeft,
                TopRight,
                BottomLeft,
                BottomRight
        };

        CADrawable( double x, double y );       // x and y position of an element in absolute world units
        virtual ~CADrawable() { }
        virtual void draw(QPainter *p, const CADrawSettings s) = 0;
        virtual CADrawable *clone();

        void drawHScaleHandles( QPainter *p, const CADrawSettings s );
        void drawVScaleHandles( QPainter *p, const CADrawSettings s );

        inline CADrawableType drawableType() { return _drawableType; }
        inline double xPos() const { return _xPos; }
        inline double yPos() const { return _yPos; }
        inline double width() const { return _width; }
        inline double height() const { return _height; }
        inline double neededSpaceWidth() const { return _neededSpaceWidth; }
        inline double neededSpaceHeight() const { return _neededSpaceHeight; }
        inline double neededWidth() const { return _width+_neededSpaceWidth; }
        inline double neededHeight() const { return _height+_neededSpaceHeight; }
        inline double xCenter() const { return _xPos + (_width)/2; }
        inline double yCenter() const { return _yPos + (_height)/2; }
        inline const QRect bBox() const { return QRect(_xPos, _yPos, _width, _height); }
        inline bool isVisible() const { return _visible; }
        inline bool isSelectable() const { return _selectable; }
        inline bool isHScalable() const { return _hScalable; }
        inline bool isVScalable() const { return _vScalable; }

        inline void setXPos(double xPos) { _xPos = xPos; }
        inline void setYPos(double yPos) { _yPos = yPos; }
        inline void setWidth(double width) { _width = width; }
        inline void setHeight(double height) { _height = height; }
        inline void setNeededSpaceWidth( double width ) { _neededSpaceWidth = width; }
        inline void setNeededSpaceHeight( double height ) { _neededSpaceHeight = height; }
        inline void setVisible(bool v) { _visible = v; }
        inline void setSelectable(bool s) { _selectable = s; }
        inline void setHScalable(bool s) { _hScalable = s; }
        inline void setVScalable(bool s) { _vScalable = s; }

protected:
        void setDrawableType( CADrawableType t ) { _drawableType = t; };

        CADrawableType _drawableType; // DrawableMusElement or DrawableContext.
        double _xPos;
        double _yPos;
        double _width;             // Element's width as it appears on the screen
        double _height;            // Element's height as it appears on the screen
        double _neededSpaceWidth;  // Minimum width the next element should be placed next to it by engraver
        double _neededSpaceHeight; // Minimum height the next element should be placed next to it by engraver
        bool _visible;
        bool _selectable;       // Can the element be clicked on and is then selected
        bool _hScalable;    // Can the element be streched horizontally
        bool _vScalable;    // Can the element be streched vertically

        static const int SCALE_HANDLES_SIZE; // Width and Height of the scale handles squares in pixels
};

#endif /* DRAWABLE_H_ */