SDL系列之

 1 #include <SDL.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <math.h>
 5 #include "SDL_draw.h"           //包含SDL_draw库的头文件
 6 int main()
 7 {
 8         int i;
 9         double t;
10         double x,y;
11         double x0=320, y0=240;
12         SDL_Surface *screen;    //一个屏幕指针
13         if(SDL_Init(SDL_INIT_VIDEO) < 0){       //初始化视频子系统失败
14                 fprintf(stderr,"无法初始化:%s
",SDL_GetError());       //不能用printf()，因为没有包含stdio.h头文件
15                 exit(1);
16         }   
17         //设置视频模式
18         screen=SDL_SetVideoMode(640,480,16,SDL_SWSURFACE);
19         if(screen==NULL){
20                 fprintf(stderr,"无法设置视频模式:%s
",SDL_GetError());
21                 exit(1);
22         }   
23         atexit(SDL_Quit);       //退出
24 
25         //画直线，从点(240,180)到点(400,300),颜色为白色
26         Draw_Line(screen,240,180,400,300,SDL_MapRGB(screen->format, 255,255,255));
27         //画直线，从点(400,180)到点(240,300),颜色为红色
28         Draw_Line(screen,400,180,240,300,SDL_MapRGB(screen->format, 255,0,0));
29         for(i=0;i<640;i+=2){
30         //      y=240-120*sin(3.14*i/180);
31                 x=x0 + 120*sin(3.14*i/180);
32                 y=y0 + 120*cos(3.14*i/180);
33                 Draw_Pixel(screen,x,y,SDL_MapRGB(screen->format,0,255,0));
34         //      for(t=0; t<500000; t++);
35                 SDL_Delay(5);                   //停留5毫秒
36                 SDL_UpdateRect(screen,0,0,0,0);         //更新整个屏幕
37         //      SDL_Delay(500);                 //停留5秒
38         }   
39         SDL_UpdateRect(screen,0,0,0,0);         //更新整个屏幕
40         SDL_Delay(5000);                        //停留5秒
41         return 0;
42 }

上面的代码做的是动态的画一个圆，然后下面就该设置一下视频背景色了，太懒，我就不整合到一起去了

 1 #include<SDL.h>
 2 #include<stdlib.h>
 3 int main(){
 4         SDL_Surface *screen;
 5         Uint32 color;
 6         int x;
 7         if(SDL_Init(SDL_INIT_VIDEO)<0){
 8                 fprintf(stderr, "无法初始化SDL：%s
",SDL_GetError());
 9                 exit(1);
10         }   
11         screen=SDL_SetVideoMode(640,480,16,SDL_SWSURFACE);
12         if(screen==NULL){
13                 fprintf(stderr, "无法设置视频%s
", SDL_GetError());
14                 exit(1);
15         }   
16         atexit(SDL_Quit);
17         for(x=0;x<=255;x+=1){
18                 color=SDL_MapRGB(screen->format,255,255,x);
19                 SDL_FillRect(screen,NULL,color);
20                 SDL_UpdateRect(screen,0,0,0,0);
21         }   
22         SDL_Delay(6000);
23         return 0;
24 }