matrixblitter.h

矩阵编码和马尔可夫链的实现例程。实现类似黑客帝国数字屏保

/*
 Copyright (c) 2001 
 Author: Konstantin Boukreev 
 E-mail: [e-mail] 

 Created: 18.12.2001 11:30:52
 Version: 1.0.0
 
 emulates the Matrix code you can see on Dozer's screens in the movie
 but it can draw a streams of code in any colour :)
*/

#ifndef _MatrixBlitter_0439143c_d325_4172_a227_f7f548951fd8
#define _MatrixBlitter_0439143c_d325_4172_a227_f7f548951fd8

#if _MSC_VER > 1000 
#pragma once
#endif // _MSC_VER > 1000

#include "HSVModel.h"

class MatrixBlitter
{
public:
	
	typedef char (*fn_GetChar)(int);

private:
	HDC			m_hdc;
	HBITMAP		m_bmp;
	HBITMAP		m_unused;
	HFONT		m_font;
	HFONT		m_font2;
	bool		m_font_owner;
	bool		m_font2_owner;
	HBRUSH		m_brush;	
	HSLModel	m_hsl;
	HSLModel	m_hsl2;
	unsigned	m_bcolor;	
	unsigned	m_cx;
	unsigned	m_cy;
	unsigned	m_height;
	unsigned	m_width;
	unsigned	m_char_cx;
	unsigned	m_char_cy;	
	unsigned	m_total;
	unsigned	m_now;
	unsigned	m_speed1;
	unsigned	m_speed2;
	float		m_damping;
	void *		m_raw_mem;
	fn_GetChar	m_fnGetChar;
	
	struct stream
	{		
		stream (unsigned pos, unsigned length, unsigned speed, HSLModel hsl, HSLModel hs2);
		
		#ifdef _DEBUG
		unsigned debug_trap;
		#endif
		unsigned x;
		unsigned y;
		int		 delay;
		unsigned speed;						
		unsigned color;
		unsigned color2;		
		bool	 hidden;	
		char	 code[1];

		static unsigned shift (HSLModel hsl);
	};

	typedef std::vector<stream *> streams_t;
	streams_t m_streams;

public:
	MatrixBlitter(fn_GetChar = GetChar);
	~MatrixBlitter();

	void Init(HDC, unsigned, unsigned, unsigned);
	void Blit(HDC, int, int);
	void Refresh();
	void Render();
	void Clear();

	// 
	void SetSpeed		(unsigned s1, unsigned s2)	{ m_speed1 = s1; m_speed2 = s2; }
	void SetFont		(HFONT);
	void SetHeadFont	(HFONT);
	void SetColor		(unsigned color)			{ m_hsl.rgb(color); }
	void SetHeadColor	(unsigned color)			{ m_hsl2.rgb(color); }
	void SetBackColor	(unsigned color);
	void SetActivity	(float f)					{ m_now = (unsigned)(m_total * f); }
	void SetDamping		(float f)					{ m_damping = 1.f - f; }
	
 private:	
	void Generate();
	void UpdateStream(stream *);
	
 public:
	static char GetChar(int x)
	{		
		x; // unused
		static char	alpha[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-@#*&?!";		
		return alpha[rand() % sizeof(alpha)];	
	}
};

#endif //_MatrixBlitter_0439143c_d325_4172_a227_f7f548951fd8