//****************************************************************************************************
// 画直线子程序 void W_Line(int s_x,int s_y,int e_x,int e_y,int Mode)
// 设计者: 牟联树
// 描 述: 以s_x,s_y为起点,e_x,e_y为终点画一直线.
// Mode=0:画直线,Mode=1:画虚线
// 日 期: 2003.11.22
// 版本号: 1.0
//****************************************************************************************************
void W_line(int s_x,int s_y,int e_x,int e_y,int Mode)
{
int Err=0,D_x,D_y;
if(e_y<s_y)
{
D_x = e_x;
e_x = s_x;s_x = D_x;
D_x = e_y;
e_y = s_y;s_y = D_x;
}
Writ_Dot(s_x,s_y,Mode);
D_x = e_x - s_x;
D_y = e_y - s_y;
if(D_x>0)
{
if(D_x>=D_y)
{ //0=<K<=1
while(s_x!=e_x)
{
if(Err>=0)
{
s_y+=1;
Err+=(D_y-D_x);
}
else Err+=D_y;
s_x+=1;
Writ_Dot(s_x,s_y,Mode);
}
}
else
{ //K>1
while(s_y!=e_y)
{
if(Err>0)
{
s_x+=1;
Err+=(D_x-D_y);
}
else Err+=D_x;
s_y+=1;
Writ_Dot(s_x,s_y,Mode);
}
}
}
else
{
D_x = s_x - e_x;
if(D_x>=D_y)
{ //-1=<K<0
while(s_x!=e_x)
{
if(Err>=0)
{
s_y+=1;
Err+=(D_y-D_x);
}
else Err+=D_y;
s_x-=1;
Writ_Dot(s_x,s_y,Mode);
}
}
else
{ //K< -1
while(s_y!=e_y)
{
if(Err<=0) Err+=D_x;
else
{
s_x-=1;
Err+=(D_x-D_y);
}
s_y+=1;
Writ_Dot(s_x,s_y,Mode);
}
}
}
}
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