Class TransformedView

extensions/olcPGEX_TransformedView.h:94–218

namespace olc
{
	class TransformedView : public olc::PGEX
	{
	public:
		TransformedView() = default;
		virtual void Initialise(const olc::vi2d& vViewArea, const olc::vf2d& vPixelScale = { 1.0f, 1.0f });

		olc::PixelGameEngine* GetPGE();

	public:
		void SetWorldOffset(const olc::vf2d& vOffset);
		void MoveWorldOffset(const olc::vf2d& vDeltaOffset);
		void SetWorldScale(const olc::vf2d& vScale);
		void SetViewArea(const olc::vi2d& vViewArea);
		olc::vf2d GetWorldTL() const;
		olc::vf2d GetWorldBR() const;
		olc::vf2d GetWorldVisibleArea() const;
		void ZoomAtScreenPos(const float fDeltaZoom, const olc::vi2d& vPos);
		void SetZoom(const float fZoom, const olc::vf2d& vPos);
		void StartPan(const olc::vi2d& vPos);
		void UpdatePan(const olc::vi2d& vPos);
		void EndPan(const olc::vi2d& vPos);
		const olc::vf2d& GetWorldOffset() const;
		const olc::vf2d& GetWorldScale() const;
		virtual olc::vf2d WorldToScreen(const olc::vf2d& vWorldPos) const;
		virtual olc::vf2d ScreenToWorld(const olc::vf2d& vScreenPos) const;
		virtual olc::vf2d ScaleToWorld(const olc::vf2d& vScreenSize) const;
		virtual olc::vf2d ScaleToScreen(const olc::vf2d& vWorldSize) const;
		virtual bool IsPointVisible(const olc::vf2d& vPos) const;
		virtual bool IsRectVisible(const olc::vf2d& vPos, const olc::vf2d& vSize) const;
		virtual void HandlePanAndZoom(const int nMouseButton = 2, const float fZoomRate = 0.1f, const bool bPan = true, const bool bZoom = true);
		void SetScaleExtents(const olc::vf2d& vScaleMin, const olc::vf2d& vScaleMax);
		void EnableScaleClamp(const bool bEnable);

	protected:
		olc::vf2d m_vWorldOffset = { 0.0f, 0.0f };
		olc::vf2d m_vWorldScale = { 1.0f, 1.0f };
		olc::vf2d m_vRecipPixel = { 1.0f, 1.0f };
		olc::vf2d m_vPixelScale = { 1.0f, 1.0f };
		bool m_bPanning = false;
		olc::vf2d m_vStartPan = { 0.0f, 0.0f };
		olc::vi2d m_vViewArea;
		bool m_bZoomClamp = false;
		olc::vf2d m_vMaxScale = { 0.0f, 0.0f };
		olc::vf2d m_vMinScale = { 0.0f, 0.0f };

	public: // Hopefully, these should look familiar!
		// Plots a single point
		virtual bool Draw(float x, float y, olc::Pixel p = olc::WHITE);
		bool Draw(const olc::vf2d& pos, olc::Pixel p = olc::WHITE);		
		// Draws a line from (x1,y1) to (x2,y2)
		void DrawLine(float x1, float y1, float x2, float y2, olc::Pixel p = olc::WHITE, uint32_t pattern = 0xFFFFFFFF);
		void DrawLine(const olc::vf2d& pos1, const olc::vf2d& pos2, olc::Pixel p = olc::WHITE, uint32_t pattern = 0xFFFFFFFF);
		// Draws a circle located at (x,y) with radius
		void DrawCircle(float x, float y, float radius, olc::Pixel p = olc::WHITE, uint8_t mask = 0xFF);
		void DrawCircle(const olc::vf2d& pos, float radius, olc::Pixel p = olc::WHITE, uint8_t mask = 0xFF);
		// Fills a circle located at (x,y) with radius
		void FillCircle(float x, float y, float radius, olc::Pixel p = olc::WHITE);
		void FillCircle(const olc::vf2d& pos, float radius, olc::Pixel p = olc::WHITE);