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#ifndef VIEWPORT_H

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#define VIEWPORT_H

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struct ViewPort {

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	int left,top;												// screen coordinates for the viewport

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	int width, height;									// screen width/height for the viewport

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	int virtual_left, virtual_top;			// virtual coordinates

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	int virtual_width, virtual_height;	// these are just width << zoom, height << zoom

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	byte zoom;	

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};

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/* viewport.c */

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Point MapXYZToViewport(ViewPort *vp, uint x, uint y, uint z);

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void AssignWindowViewport(Window *w, int x, int y, 

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	int width, int height, uint32 follow_flags, byte zoom);

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void SetViewportPosition(Window *w, int x, int y);

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ViewPort *IsPtInWindowViewport(Window *w, int x, int y);

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Point GetTileBelowCursor();

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Point GetTileZoomCenter(bool in);

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void UpdateViewportPosition(Window *w);

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void OffsetGroundSprite(int x, int y);

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void DrawGroundSprite(uint32 image);

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void DrawGroundSpriteAt(uint32 image, int x, int y, byte z);

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void AddSortableSpriteToDraw(uint32 image, int x, int y, int w, int h, byte dz, byte z);

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void *AddStringToDraw(int x, int y, StringID string, uint32 params_1, uint32 params_2);

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void AddChildSpriteScreen(uint32 image, int x, int y);

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void StartSpriteCombine();

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void EndSpriteCombine();

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void HandleViewportClicked(ViewPort *vp, int x, int y);

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void PlaceObject();

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void SetRedErrorSquare(TileIndex tile);

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void SetTileSelectSize(int w, int h);

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void SetTileSelectBigSize(int ox, int oy, int sx, int sy);

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void VpStartPlaceSizing(uint tile, int user);

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void VpStartPreSizing();

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void VpSetPresizeRange(uint from, uint to);

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void VpSetPlaceSizingLimit(int limit);

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Vehicle *CheckMouseOverVehicle();

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enum {

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	VPM_X_OR_Y = 0,

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	VPM_FIX_X = 1,

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	VPM_FIX_Y = 2,

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	VPM_RAILDIRS = 3,

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	VPM_X_AND_Y = 4,

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	VPM_X_AND_Y_LIMITED = 5,

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};

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void VpSelectTilesWithMethod(int x, int y, int method);

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enum {

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	HT_NONE = 0,

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	HT_RECT = 0x80,

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	HT_POINT = 0x40,

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	HT_LINE = 0x20,

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};

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typedef struct TileHighlightData {

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	Point size;

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	Point outersize;

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	Point pos;

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	Point offs;

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	Point new_pos;

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	Point new_size;

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	Point new_outersize;

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	Point selend, selstart;

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	byte dirty;

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	byte sizelimit;

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	byte drawstyle;

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	byte new_drawstyle;

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	byte next_drawstyle;

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	byte place_mode;

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	byte window_class;

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	bool make_square_red;

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	uint16 window_number;

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	int userdata;

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	TileIndex redsq;

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} TileHighlightData;

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enum AnimCursors {

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	ANIMCURSOR_DEMOLISH = -1,

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	ANIMCURSOR_LOWERLAND = -2,

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	ANIMCURSOR_RAISELAND = -3,

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	ANIMCURSOR_PICKSTATION = -4,

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	ANIMCURSOR_BUILDSIGNALS = -5,

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};

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// common button handler

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bool HandlePlacePushButton(Window *w, int widget, uint32 cursor, int mode, PlaceProc *placeproc);

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/* viewport.c */

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VARDEF ViewPort _viewports[18];

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VARDEF TileHighlightData _thd;

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VARDEF uint32 _active_viewports;

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VARDEF Point _tile_fract_coords;

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extern TileHighlightData * const _thd_ptr;

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#endif