#include<math.h>
#define VGA_WIDTH     200
#define Vga_Set_Pixel(base,x,y,k)             IOWR(base, y*VGA_WIDTH+x, k) //改動過       
#define PI 3.1415926
#define M1 17                   
#define M2 15
unsigned extern_start_x,extern_start_y;
unsigned long extern_color;
unsigned long RGB(unsigned int r,unsigned int g,unsigned int b)
{
  unsigned long temp;
  temp=r+g*1024+b*1048576;
 return (unsigned long)temp;
}
MoveTo(unsigned int x,unsigned int y)
{
   extern_start_x=x;
   extern_start_y=y;
}
LineTo(unsigned int x,unsigned int y)
{
    unsigned int i,k,start_x,end_x;      
    i=abs(x-extern_start_x);
    if(x-extern_start_x>0)
    {
       start_x=extern_start_x;
       end_x=x;
     }    
    for(k=0;k<i;k++)    
    SetPixel(start_x+k,y,extern_color);
    MoveTo(k+start_x,y);
}
SetColor(unsigned long color)
{
  extern_color=color;
}