Canvas implementation for C#

#if !defined(AFX_CANVAS_H__9AFA14C2_2DA3_48F1_9CC9_33B220B96494__INCLUDED_)
#define AFX_CANVAS_H__9AFA14C2_2DA3_48F1_9CC9_33B220B96494__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// Canvas.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CCanvas window

class CCanvas : public CStatic
{
// Construction
public:
	CCanvas();

// Attributes
public:
	// Border style
	enum BORDER
	{
		SUNKEN,				// Sunken (CLIENT_EDGE)
		LOW,				// Low sunken (STATIC_EDGE)
		UP,					// Up (not too high)
		HIGH,				// High (MODAL_FRAME)
		FLAT,				// Flat (2 pixels large Border DKSHADOW)
		FRAME,				// Raised frame
		LIGHT_FRAME,		// Light raised frame
		THIN_FRAME,			// Thin raised frame
		THIN_LIGHT_FRAME,	// Thin light raised frame
		ETCHED,				// Etched
		ETCHED2,			// Etched 2
		SIMPLE				// Simple rectangle DKSHADOW
	};

private:
	// Buffer
	CDC* m_buffer;
	// Bitmap associated to m_buffer
	CBitmap* m_bitmap;

	// Double buffer / simple buffer
	bool m_double_buffered;
	// Auto focus
	bool m_auto_focus;
	// Mouse In
	bool m_mouse_in;
	// Draw the background
	bool m_draw_background;
	// Draw the border
	bool m_draw_border;

	// Background color
	COLORREF m_back_color;

	// Border Style
	BORDER m_border_style;

	// Cursor
	HCURSOR m_cursor;

	// Width and Height
	int m_width, m_height;

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CCanvas)
	protected:
	virtual void PreSubclassWindow();
	//}}AFX_VIRTUAL

// Operations
public:
	// Return true if the mouse is in the client area
	bool IsMouseIn() { return m_mouse_in; }

	// Set double buffer
	void SetDoubleBuffer(bool flag) { m_double_buffered = flag; } 
	// Check if double buffered
	bool IsDoubleBuffered() { return m_double_buffered; }

	// Set auto focus
	void SetAutoFocus(bool flag) { m_auto_focus = flag; } 
	// Check if auto focus
	bool IsAutoFocus() { return m_auto_focus; }

	// Set the background color
	void SetBackgroundColor(COLORREF back) { m_back_color = back; }
	// Get the background color
	COLORREF GetBackgroundColor() { return m_back_color; }

	// Set background to be displayed
	void DrawBackground(bool flag) { m_draw_background = flag; }
	// Check if the background is displayed
	bool DrawBackground() { return m_draw_background; }

	// Set the border style
	void SetBorder(BORDER border_style) { m_border_style = border_style; }
	// Get the border Style
	BORDER GetBorder() { return m_border_style; }

	// Draw the border
	void DrawBorder(bool flag) { m_draw_border = flag; }
	// Check if the border is displayed
	bool DrawBorder() { return m_draw_border; }

	// Set the cursor (Win32 cursor)
	void SetWinCursor(LPCTSTR cursor);
	// Set application cursor from ID resource
	void SetAppCursor(UINT nIDResource);
	// Set custom cursor
	void SetCursor(HCURSOR hCursor) { m_cursor = hCursor; }

	// Get the width
	int GetWidth() { return m_width; }
	// Get the height
	int GetHeight() { return m_height; }

private:

// Implementation
public:
	virtual ~CCanvas();

	// Main Paint method
	virtual void Paint(CDC* dc) {}
	
	// Draw border
	virtual void DrawBorder(CDC* dc);

	// Repaint
	void Repaint();
	
	// OnMouseExit: Called each time the mouse exit the client area
	virtual void OnMouseExit() {}

// Helpers
public:
	// Draw a rectangle
	void DrawRect(CDC *dc, RECT rect);
	void DrawRect(CDC *dc, int x, int y, int w, int h);
	void DrawRect(CDC *dc, RECT rect, COLORREF color);
	void DrawRect(CDC *dc, int x, int y, int w, int h, COLORREF color);

	// Draw a circle
	void DrawCircle(CDC *dc, int x, int y, int radius);
	void DrawCircle(CDC *dc, int x, int y, int radius, COLORREF color);

	// Draw a line
	void DrawLine(CDC *dc, CPoint& start, CPoint& end);
	void DrawLine(CDC *dc, int xStart, int yStart, int xEnd, int yEnd);
	void DrawLine(CDC *dc, CPoint& start, CPoint& end, COLORREF color);
	void DrawLine(CDC *dc, int xStart, int yStart, int xEnd, int yEnd, COLORREF color);

private:
	// Initialize the buffer
	void Init();

	// Clean the buffer
	void Clean();

protected:
	// Generated message map functions
	//{{AFX_MSG(CCanvas)
	afx_msg UINT OnNcHitTest(CPoint point);
	afx_msg void OnPaint();
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
	afx_msg void OnTimer(UINT nIDEvent);
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_CANVAS_H__9AFA14C2_2DA3_48F1_9CC9_33B220B96494__INCLUDED_)