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楼主 |
发表于 2013-4-21 10:54:57
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/*画直线
void GUI_line(uchar x1,uchar y1,uchar x2,uchar y2,uchar flag) //从x1,y1到x2,y2
{
int dy,dx;
int stepx,stepy,fraction;
dy=y2-y1;
dx=x2-x1;
if(dy<0)
{
dy=-dy;
stepy=-1;
}
else{
stepy=1;
}
if(dx<0)
{
dx=-dx;
stepx=-1;
}
else{
stepx=1;
}
dy<<=1;
dx<<=1;
GUI_Point(x1,y1,flag);
if(dx>dy)
{
fraction=dy-(dx>>1);
while(x1!=x2)
{
if(fraction>=0)
{
y1+=stepy;
fraction-=dx;
}
x1+=stepx;
fraction+=dy;
GUI_Point(x1,y1,flag);
}
}
else
{
fraction=dx-(dy>>1);
while(y1!=y2)
{
if(fraction>=0)
{
x1+=stepx;
fraction-=dy;
}
y1+=stepy;
fraction+=dx;
GUI_Point(x1,y1,flag);
}
}
} |
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