SDL问题(页 1) - C/C++ (STL/boost) - Linux伊甸园论坛

chenrenjin 发表于 2006-12-20 19:16

SDL问题

我刚接触linux下编程，所以不懂，麻烦各位帮我看看是什么问题f lZu!fX
程序代码
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#include <stdio.h> 1^^eb5n[
#include <stdlib.h>2P.^8{NI!KY
#include <SDL.h>
#include <SDL_image.h>
#define DIR_UP 0
#define DIR_LEFT 17rZ!oP$fft&r
#define DIR_DOWN 2
#define DIR_RIGHT 3Y ekq*M/Bj)D z$D
SDL_Surface *screen;
typedef struct Sprite_t {
int width;
int height;%D3H"fr:}
int x;;O uE8G4OHF
int y;
int ox;
int oy;C|q5A"F3F&R$g$L3R;D
int dir;
int subframe;C|WM1O g
int speed;
int timer;
int moving; //use to calculate subframe
SDL_Surface *image;
}Sprite_t;
typedef enum GameState {
GAME_RUNNING,
GAME_OVER,fzm4t'VF/s
}GameState;E'O8]Ym
void Init_SDL() -u3oD!r7x m#w&YU
{h7D2yU"W/U\O
if ( SDL_Init( SDL_INIT_VIDEO) < 0 ) {{+_g@4@:n$b4?s
fprintf(stderr,"Can't init SDL: %s\n",SDL_GetError());
exit(1);
}
screen = SDL_SetVideoMode(640, 480, 16, SDL_SWSURFACE);9i@DG ^
if ( screen == NULL ) {)Uv+`:IAp F }+g
fprintf(stderr, "Error: %s\n",SDL_GetError());(U(qT7?Jq6KV l:D [
exit(1);
}1G1pT,b1F
atexit(SDL_Quit);
}
void DrawSprite(SDL_Surface *surface,Sprite_t *sprite)
{
SDL_Rect src_rect,des_rect;xTB4@9E7Qc5K#m
sprite->subframe=sprite->timer/4;
src_rect.w=des_rect.w=sprite->width;vKS ^I!N8P {
src_rect.h=des_rect.h=sprite->height;2kIa V(~%m!VH`
src_rect.x=sprite->subframe*sprite->width;
src_rect.y=sprite->dir*sprite->height;
des_rect.x=sprite->x;
des_rect.y=sprite->y; Y!Sf5_2u^7`
//Draw sprite to new position
SDL_BlitSurface(sprite->image,&src_rect,surface,&des_rect);
}
void ClearSprite(SDL_Surface *surface,Sprite_t *sprite) bf1J&lmW$R
{!\Q#{j \ty
SDL_Rect mask;-WP/d!V3MK5|
mask.w=sprite->width;
mask.h=sprite->height;
mask.x=sprite->ox;
mask.y=sprite->oy;/\%S:R7X4M ?F-p/q
//Clear sprite from the old positions0J?/|J:O\ e
SDL_FillRect(surface,&mask,SDL_MapRGB(surface->format,0,0,0));(gB![R.i9K"[
}
Uint32 TimeLeft() 9O'pH&^HY
{Li:l"Vt,se)ms
static Uint32 next_time=0;HC%Rzm!?~m9T$\
Uint32 now;p&T8B_Pg;U
now=SDL_GetTicks();
if(next_time<=now){
next_time=now+30;
return(0);
}
return(next_time-now);
}

int main()-{"THH#lgw9q
{
GameState game_state;GG` ?1iy Sf~
Sprite_t tank;
SDL_Event event;
Init_SDL(); P!iEW lR]L
tank.image=IMG_Load("tank.png");
SDL_SetColorKey(tank.image,SDL_SRCCOLORKEY,SDL_MapRGB(tank.image->format,255,0,255));N0fTZt&@t
tank.image=SDL_DisplayFormat(tank.image);1O.Wa@ |^JJ&JS{
game_state=GAME_RUNNING;
tank.dir=DIR_RIGHT;
tank.width=32;Gp/n$v!V(ne7NE
tank.height=32;
tank.x=300;"bZ,TG1mlM
tank.y=200;
tank.ox=tank.x;
tank.oy=tank.y;
tank.moving=0;9r!u|%NN$M}'Q$M
tank.speed=3;,x u(KUn
tank.timer=0;$bPZ_xn4{
while(game_state==GAME_RUNNING){
ClearSprite(screen,&tank);u2e8L0_F2orT
//Get Input
SDL_PollEvent(&event);
switch(event.type){
case SDL_KEYDOWN: ,Cq'sz,D#u_
switch(event.key.keysym.sym){
case SDLK_ESCAPE:
game_state=GAME_OVER;:P9^@|3RQ;y~ c
break;
case SDLK_UP:
tank.dir=DIR_UP;a|B$H8di
tank.y-=tank.speed;
break;,~5b'L-XE/S
case SDLK_DOWN:
tank.dir=DIR_DOWN;-V7v e1\ |-u
tank.y+=tank.speed;7dU e}{wZ'nD:T
break;
case SDLK_LEFT:[1H(xI6bwH4N
tank.dir=DIR_LEFT;
tank.x-=tank.speed;
break;
case SDLK_RIGHT:
tank.dir=DIR_RIGHT;bL`a7cM
tank.x+=tank.speed;
break;
default:n#s8b9R ^0I~3i+Gc7D*L$o
break;1yI? p"}\N P}n
},_*K-]^3H#r.v%l0{Ps^
case SDL_KEYUP: #A Tt-o{%J1K2P
break;
default: Zj(f"N ~D6^,T
break;3@r;ui;[])T \$K
}
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DrawSprite(screen,&tank);
tank.ox=tank.x;
tank.oy=tank.y; 'Ez M@[
SDL_UpdateRect(screen,0,0,0,0);
SDL_Delay(TimeLeft());
tank.timer++;ZV#| ]W$zo ^*CE:W
tank.timer%=8;
}
SDL_FreeSurface(tank.image);
}

编译的时候提示
/tmp/ccCxlEey.o(.text+0xlf8):in function 'main';
test.c:undefined reference to 'IMG_Load'
collect2:ld 返回 1
是不是tank.image=IMG_Load("tank.png");这句有问题？
请各位指点以下我该怎么改，谢谢

chayedan 发表于 2007-3-9 17:07

是个坦克游戏程序吧，IMG_Load（）函数定义了没有？好像是没定义啊

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SDL问题