作者：龍飛
7.1：演示程序源代碼
今天因?yàn)橐粋€(gè)網(wǎng)上的朋友的請(qǐng)求，做個(gè)一個(gè)關(guān)于鼠標(biāo)事件的演示程序。實(shí)際上，可以完全用到前面我們構(gòu)造的類和類方法，這里送上主程序，供大家參考。其他兩個(gè)文件和圖片文件均不需要任何改變。
#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);
//Create 2 SDL surface for the screen that just created.
DisplaySurface backGround("bg.bmp", screen);
DisplaySurface frontImage("image.bmp", screen);
//Blit backGround surface to screen and flip the screen.
backGround.blit();
screen.flip();
//moving image's coordinate.
int xpos = 0;
int ypos = 0;
//mouse's coordinate.
int px = 0;
int py = 0;
//moving image's size.
const int IMG_WIDTH = 128;
const int IMG_HEIGHT = 128;
//main loop.
bool gameOver = false;
while( gameOver == false ){
//press ESC or click X to quit.
SDL_Event gameEvent;
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;
}
}
//mouse event
if ( gameEvent.type == SDL_MOUSEMOTION ) {
px = gameEvent.motion.x;
py = gameEvent.motion.y;
}
}
if ( xpos < px )
xpos++;
if ( xpos > px )
xpos--;
if ( ypos < py )
ypos++;
if ( ypos > py )
ypos--;
backGround.blit(xpos, ypos, xpos, ypos, IMG_WIDTH, IMG_HEIGHT);
frontImage.blit(xpos, ypos);
screen.flip();
}
return 0;
}
posted on 2008-03-02 22:02
lf426 閱讀(3401)
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SDL入門教程