图形与动画-04

5、运动的卫星
   运动的卫星与QW43.C有些类似，只不过卫星是绕着屏幕不断地运行直到按任意键为止。
/*运动的卫星QW45.C*/
#include<graphics.h>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>

#define SIZE 10

void draw_image(int x,int y);
void putpixel_demo(void);

int main()
{
   int gmode,gdriver=DETECT,errorcode;
   void *pt_addr;
   int x,y,maxx,maxy,midx,midy,i;
   unsigned int size;
   initgraph(&gdriver,&gmode,"\\tc3\\bgi");
   errorcode=graphresult();
   if(errorcode!=0)
   {
      printf("Graphics error: %s\n",grapherrormsg(errorcode));
   printf("Press any key to halt:");
      getch();
      exit(1);
   }
   maxx=getmaxx();
   maxy=getmaxy();
   midx=maxx/2;
   x=0;
   midy=maxy/2;
   y=maxy/2;
   setcolor(YELLOW);
   settextstyle(TRIPLEX_FONT,HORIZ_DIR,4);
   settextjustify(CENTER_TEXT,CENTER_TEXT);
   outtextxy(midx,400,"COMPUTER WORLD");
   setcolor(BLACK);
   setcolor(RED);
   setlinestyle(SOLID_LINE,0,NORM_WIDTH);
   setcolor(LIGHTBLUE);
   for(i=0;i<13;i++)
   {
      ellipse(midx,midy,0,360,100,100-8*i);
      ellipse(midx,midy,0,360,100-8*i,100);
   }
   draw_image(x,y);
   size=imagesize(x,y-SIZE,x+(4*SIZE),y+SIZE);
   pt_addr=malloc(size);
   getimage(x,y-SIZE,x+(4*SIZE),y+SIZE,pt_addr);
   putpixel_demo();
   setcolor(WHITE);
   setlinestyle(SOLID_LINE,0,NORM_WIDTH);
   rectangle(0,0,maxx,maxy);
   while(!kbhit())
   {
      putimage(x,y-SIZE,pt_addr,XOR_PUT);
      x=x+5;
      if(x>maxx)
         x=0;
   putimage(x,y-SIZE,pt_addr,XOR_PUT);
      delay(100);
   }
   free(pt_addr);
   closegraph();
   return 0;
}

void draw_image(int x,int y)
{
   moveto(x+10,y);
   setcolor(14);
   setfillstyle(1,4);
   linerel(-3*10,2*10);
   moveto(x+10,y);
   linerel(-3*10,-2*10);
   moveto(x+25,y);
   linerel(-5*10,0);
   fillellipse(x+13,y,8,8);
}

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