在指定两点间画一直线

[c]代码库

#include <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

int main(void) 
{ 
   /* request auto detection */ 
   int gdriver = DETECT, gmode, errorcode; 
   int xmax, ymax; 

   /* initialize graphics and local variables */ 
   initgraph(&gdriver, &gmode, ""); 

   /* read result of initialization */ 
   errorcode = graphresult(); 
   /* an error occurred */ 
   if (errorcode != grOk) 
   { 
      printf("Graphics error: %s\n", 
             grapherrormsg(errorcode)); 
      printf("Press any key to halt:"); 
      getch(); 
      exit(1); 
   } 

   setcolor(getmaxcolor()); 
   xmax = getmaxx(); 
   ymax = getmaxy(); 

   /* draw a diagonal line */ 
   line(0, 0, xmax, ymax); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
}