viewport.h

swain-0.5.2.zip的源代码,比较好用,希望大家喜欢.

/*
This file is part of SWAIN (http://sourceforge.net/projects/swain).
Copyright (C) 2006  Daniel Lindstr鰉 and Daniel Nilsson

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA  02110-1301, USA.
*/
#pragma once

// Forward declaration of classes defined in this file, must be before includes.
class ViewPort;

#include "coords.h"
#include "Canvas.h"
#include "Bitmap.h"

// How the zoom depends on the size of the window
#define ZOOMFACTOR	(max(width,height))
// Convert from float to pixel coordinates (z = zoom, o = offset/pan, f = float coord)
#define F2P(z,o,f)	((int)( ((f)-(o)) * ((z)*ZOOMFACTOR) ))
// Convert from pixel to float coordinates (z = zoom, o = offset/pan, p = pixel coord)
#define P2F(z,o,p)	((float)((p) / ((z)*ZOOMFACTOR) + (o)))

class ViewPort {
private:
	HWND my_hwnd;
	HDC screen;
	HDC backbuf;
	int width, height;
	float zoom;
	float overzoom;
	FPOINT pan;
	HBITMAP backbuf_bitmap;
	Canvas *canvas;
	
	HPEN pen_standard;


	int f2x(float f)	{ return F2P(zoom, pan.x, f); };
	int f2y(float f)	{ return F2P(zoom, pan.y, f); };
	float x2f(int x)	{ return P2F(zoom, pan.x, x); };
	float y2f(int y)	{ return P2F(zoom, pan.y, y); };
	
	void createBackbuffer(void);
	void destroyBackbuffer(void);
public:
	ViewPort(HWND hwnd);
	~ViewPort(void);
	void screenResized(void);
	void flip(void);
	void flip(FRECT *frect);
	void clearRect(FRECT *rect);
	void drawPolyLine(FPOINT *points, int count);
	void drawPolyLine(FPOINT *points, int count, COLORREF color);
	void drawRectangle(float left, float top, float right, float bottom, COLORREF color, int style);
	void drawPolygon(FPOINT *points, int count);
	void drawBitmap(Bitmap *bitmap, FRECT *dest, RECT *source);
	void mouseDown(POINT *p);
	void mouseUp(POINT *p);
	void mouseDragged(POINT *p);
	void redraw(void);
	void redraw(RECT *rect);
	void invalidate(FRECT *frect);
	void invalidate(void);
	void alignRect(FRECT *frect);
	void expandBoundsHack(FRECT *frect);
	void setZoomPan(float z, FPOINT *p);
	float getZoom(void);
	void getPan(FPOINT *p);
	float getMaxZoom(void);
	float getMinZoom(void);
	void setOverzoom(float f);
	void drawDot(int x, int y);
	void setCanvas(Canvas *canvas);
	void getBounds(FRECT *rect);
	void setBounds(FRECT *rect);

};