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//使用Dev c++ 4.9.9 下载更新SDL库
//附vc开发包,点击下载
//附运行动态链接库,点击下载
//支持网站:
//SDL库是一种跨平台的多媒体库,与DirectX相比并不逊色.而且相比之下调用更加简单.
//-----------------------------------------------------------------------------------------------------
＃i nclude <stdio.h>
＃i nclude <stdlib.h>
＃i nclude <string.h>
＃i nclude <SDL/SDL.h>
＃i nclude <windows.h>
/*
PLEASE NOTE: the program will require SDL.dll which is located in
dev-c++'s dll directory. You have to copy it to you
program's home directory or the path.
*/
/* The screen surface */
SDL_Surface *screen = NULL;
/* This function draws to the screen; replace this with your own code! */
static void
draw ()
{
static int direction = 0;
static int value = 0;
static int which = 0;
SDL_Rect rect;
Uint32 color;
/* Create a black background */
color = SDL_MapRGB (screen->format, 0, 0, 0);
SDL_FillRect (screen, NULL, color);
/* Determine which color the layer should have */
if (direction == 0)
{
value += 2;
if (value >= 256)
{
value = 255;
direction = 1;
}
}
else
{
value -= 2;
if (value <= 5)
{
value = 0;
direction = 0;
which++;
if (which == 5)
which = 0;
}
}
/* Draw a layer with variable color */
switch (which)
{
case 0:
color = SDL_MapRGB (screen->format, value, 0, 0);
break;
case 1:
color = SDL_MapRGB (screen->format, 0, value, 0);
break;
case 2:
color = SDL_MapRGB (screen->format, 0, 0, value);
break;
case 3:
color = SDL_MapRGB (screen->format, value, value, value);
break;
case 4:
color = SDL_MapRGB (screen->format, value, 0, value);
break;
}
rect.w = screen->w / 2;
rect.h = screen->h / 2;
rect.x = (screen->w / 2) - (rect.w / 2);
rect.y = (screen->h / 2) - (rect.h / 2);
SDL_FillRect (screen, &rect, color);
/* Make sure everything is displayed on screen */
SDL_Flip (screen);
/* Don't run too fast */
SDL_Delay (1);
}
int
main (int argc, char *argv[])
{
char *msg;
int done;
/* Initialize SDL */
if (SDL_Init (SDL_INIT_VIDEO) < 0)
{
sprintf (msg, "Couldn't initialize SDL: %s\n", SDL_GetError ());
MessageBox (0, msg, "Error", MB_ICONHAND);
free (msg);
exit (1);
}
atexit (SDL_Quit);
/* Set 640x480 16-bits video mode */
screen = SDL_SetVideoMode (640, 480, 16, SDL_SWSURFACE | SDL_DOUBLEBUF);
if (screen == NULL)
{
sprintf (msg, "Couldn't set 640x480x16 video mode: %s\n",
SDL_GetError ());
MessageBox (0, msg, "Error", MB_ICONHAND);
free (msg);
exit (2);
}
SDL_WM_SetCaption ("SDL MultiMedia Application", NULL);
done = 0;
while (!done)
{
SDL_Event event;
/* Check for events */
while (SDL_PollEvent (&event))
{
switch (event.type)
{
case SDL_KEYDOWN:
break;
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
/* Draw to screen */
draw ();
}
return 0;
}
//简要注释:实现效果是在黑色的屏幕中央忽隐忽现一个随机色的方形.
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