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SDL入门教程(八):2、裁剪精灵图片的完整源代码

2012-09-11 11:03 381 查看



//UVi Soft (2008)

//Long Fei (lf426), E-mail: zbln426@163.com

//FileName: SurfaceClass.h

#ifndef SURFACE_CLASS_H

#define SURFACE_CLASS_H

#include <iostream>

#include <string>

#include "SDL/SDL.h"

#include "SDL/SDL_image.h"

class ScreenSurface

{

private:

static int screenNum;

int width;

int height;

int bpp;

Uint32 flags;

SDL_Surface* pScreen;

public:

ScreenSurface();

ScreenSurface(int w, int h, int b = 0, Uint32 f = 0);

~ScreenSurface();

SDL_Surface* point() const;

void flip() const;

void fillColor(Uint8 r = 0, Uint8 g = 0, Uint8 b = 0) const;

};

class DisplaySurface

{

private:

std::string fileName;

SDL_Surface* pSurface;

SDL_Surface* pScreen;

public:

DisplaySurface(const std::string& file_name, const ScreenSurface& screen);

~DisplaySurface();

SDL_Surface* point() const;

void blit() const;

void blit(int at_x, int at_y) const;

void blit(int at_x, int at_y,

int from_x, int from_y, int w, int h,

int delta_x = 0, int delta_y = 0) const;

void colorKey(Uint8 r = 0, Uint8 g = 0xFF, Uint8 b = 0xFF, Uint32 flag = SDL_SRCCOLORKEY);

};

class ErrorInfo

{

private:

std::string info;

public:

ErrorInfo():info("Unknown ERROR!")

{}

ErrorInfo(const char* c_str)

{

info = std::string(c_str);

}

ErrorInfo(const std::string& str):info(str)

{}

void show() const

{

std::cerr << info << std::endl;

}

};

#endif



//UVi Soft (2008)

//Long Fei (lf426), E-mail: zbln426@163.com

#include "SurfaceClass.h"

//VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV

//class ScreenSurface

int ScreenSurface::screenNum = 0;

ScreenSurface::ScreenSurface():

width(640), height(480), bpp(32), flags(0)

{

if ( screenNum > 0 )

throw ErrorInfo("DONOT create more than ONE screen!");

if ( SDL_Init(SDL_INIT_VIDEO < 0 ) )

throw ErrorInfo(SDL_GetError());

pScreen = SDL_SetVideoMode(width, height, bpp, flags);

screenNum++;

}

ScreenSurface::ScreenSurface(int w, int h, int b, Uint32 f):

width(w), height(h), bpp(b), flags(f)

{

if ( screenNum > 0 )

throw ErrorInfo("DONOT create more than ONE screen!");

if ( SDL_Init(SDL_INIT_VIDEO < 0 ) )

throw ErrorInfo(SDL_GetError());

pScreen = SDL_SetVideoMode(width, height, bpp, flags);

screenNum++;

}

ScreenSurface::~ScreenSurface()

{

SDL_Quit();

}

SDL_Surface* ScreenSurface::point() const

{

return pScreen;

}

void ScreenSurface::flip() const

{

if ( SDL_Flip(pScreen) < 0 )

throw ErrorInfo(SDL_GetError());

}

void ScreenSurface::fillColor(Uint8 r, Uint8 g, Uint8 b) const

{

if ( SDL_FillRect(pScreen, 0, SDL_MapRGB(pScreen->format, r, g, b)) < 0 )

throw ErrorInfo(SDL_GetError());

}

//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

//VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV

//class DisplaySurface

DisplaySurface::DisplaySurface(const std::string& file_name, const ScreenSurface& screen):

fileName(file_name)

{

SDL_Surface* pSurfaceTemp = IMG_Load(file_name.c_str());

if ( pSurfaceTemp == 0 )

throw ErrorInfo(SDL_GetError());

pSurface = SDL_DisplayFormat(pSurfaceTemp);

if ( pSurface == 0 )

throw ErrorInfo(SDL_GetError());

SDL_FreeSurface(pSurfaceTemp);

pScreen = screen.point();

}

DisplaySurface::~DisplaySurface()

{

SDL_FreeSurface(pSurface);

}

SDL_Surface* DisplaySurface::point() const

{

return pSurface;

}

void DisplaySurface::blit() const

{

if ( SDL_BlitSurface(pSurface, 0, pScreen, 0) < 0 )

throw ErrorInfo(SDL_GetError());

}

void DisplaySurface::blit(int at_x, int at_y) const

{

SDL_Rect offset;

offset.x = at_x;

offset.y = at_y;

if ( SDL_BlitSurface(pSurface, 0, pScreen, &offset) < 0 )

throw ErrorInfo(SDL_GetError());

}

void DisplaySurface::blit(int at_x, int at_y,

int from_x, int from_y, int w, int h,

int delta_x, int delta_y) const

{

SDL_Rect offset;

offset.x = at_x - delta_x;

offset.y = at_y - delta_y;

SDL_Rect dest;

dest.x = from_x - delta_x;

dest.y = from_y - delta_y;

dest.w = w + delta_x*2;

dest.h = h + delta_y*2;

if ( SDL_BlitSurface(pSurface, &dest, pScreen, &offset) < 0 )

throw ErrorInfo(SDL_GetError());

}

void DisplaySurface::colorKey(Uint8 r, Uint8 g, Uint8 b, Uint32 flag)

{

Uint32 colorkey = SDL_MapRGB(pSurface->format, r, g, b);

if ( SDL_SetColorKey(pSurface, flag, colorkey ) < 0 )

throw ErrorInfo(SDL_GetError());

}

//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA



//UVi Soft (2008)

//Long Fei (lf426), E-mail: zbln426@163.com

#include "SurfaceClass.h"

int game(int argc, char* argv[]);

int main(int argc ,char* argv[])

{

int mainRtn = 0;

try {

mainRtn = game(argc, argv);

}

catch ( const ErrorInfo& info ) {

info.show();

return -1;

}

return mainRtn;

}

int game(int argc ,char* argv[])

{

//Create a SDL screen.

const int SCREEN_WIDTH = 640;

const int SCREEN_HEIGHT = 480;

ScreenSurface screen(SCREEN_WIDTH, SCREEN_HEIGHT);

//Fill background with white.(default is black)

screen.fillColor(0xFF, 0xFF, 0xFF);

//Load a sprite pic, and colorkey.(default color: R=0,G=0xFF,B=0xFF)

DisplaySurface sprite("dots.png", screen);

sprite.colorKey();

//the 4 dots's coordinate.

int atX[4] = {0, 540, 0, 540};

int atY[4] = {0, 0, 380, 380};

//the 4 dots's clip coordinate.

int fromX[4] = {0, 100, 0 ,100};

int fromY[4] = {0, 0, 100, 100};

//dots's size.

const int IMG_WIDTH = 100;

const int IMG_HEIGHT = 100;

//clip dots.

for ( int i = 0; i < 4; i++ )

sprite.blit(atX[i], atY[i], fromX[i], fromY[i], IMG_WIDTH, IMG_HEIGHT);

//Draw dots and screen.

screen.flip();

//press ESC or click X to quit.

bool gameOver = false;

SDL_Event gameEvent;

while( gameOver == false ){

while ( SDL_PollEvent(&gameEvent) != 0 ){

if ( gameEvent.type == SDL_QUIT ){

gameOver = true;

}

if ( gameEvent.type == SDL_KEYUP ){

if ( gameEvent.key.keysym.sym == SDLK_ESCAPE ){

gameOver = true;

}

}

}

}

return 0;

}

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