SDL作图

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SDL

题1:要求用SDL编程进行绘图，如下图所示，该图形由坐标系、一个矩形和两个椭圆构成，其屏幕的背景色为白色。

#include

int main()

{

SDL_Surface*s; int r;

intret=SDL_Init(SDL_INIT_VIDEO);

if(ret<0){printf("init error!\r\n");exit(-1);};

s=SDL_SetVideoMode(640,480,16,SDL_SWSURFACE);

if(s==NULL){printf("setvideomodeerror!\r\n");exit(-1);};

atexit(SDL_Quit);

SDL_FillRect(s,NULL,SDL_MapRGB(s->format,255,255,255));//背景色

Draw_HLine(s,200,240,440,SDL_MapRGB(s->format,0,0,0));

Draw_VLine(s,320,180,300,SDL_MapRGB(s->format,255,0,0));

Draw_Ellipse(s,240,180,76,56,SDL_MapRGB(s->format,0,0,255));

Draw_FillEllipse(s,400,300,76,56,SDL_MapRGB(s->format,0,0,255));

Draw_FillRect(s,200,250,100,80,SDL_MapRGB(s->format,255,255,0));

SDL_UpdateRect(s,0,0,0,0);

SDL_Delay(5000);

return0;

//gcc drawline.c -o drawline -I/usr/include/SDL -lSDL-lSDL_draw

}

题2：要求完成阶梯状图形，效果如下图所示：

#include

void ShowBMP(char*pn,SDL_Surface *s,int x,int y)

{

SDL_Surface*i;

SDL_Rectdest;

i=SDL_LoadBMP(pn);

if(i==NULL){printf("load BMP error!\r\n");exit(-1);};

dest.x=x;

dest.y=y;

dest.w=i->w;

dest.h=i->h;

SDL_BlitSurface(i,NULL,s,&dest);

SDL_UpdateRects(s,1,&dest);

}

int main()

{

SDL_Surface*s;

intr;

intret=SDL_Init(SDL_INIT_VIDEO);

if(ret<0){printf("init error!\r\n");exit(-1);};

s=SDL_SetVideoMode(640,480,16,SDL_SWSURFACE);

if(s==NULL){printf("setvideomodeerror!\r\n");exit(-1);};

atexit(SDL_Quit);

intx,y,i,j;

SDL_FillRect(s,NULL,SDL_MapRGB(s->format,0,255,0));

SDL_UpdateRect(s,0,0,0,0);

for(i=0;i<5;i++)

for(j=0;j<5;j++)

{

x=i*48;

y=j*32;

if(i==j) ShowBMP("black.bmp",s,x,y);

elseShowBMP("white.bmp",s,x,y);

}

//ShowBMP("white.bmp",s,0,0);

SDL_Delay(5000);

return0;

}

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