I found some code on the net but haven't been able to get it
working properly. I trying to draw with mouse (any direction).
```d
void drawLine(Dot s, Dot e) {
auto d=s;
/+
// import std.algorithm : swap;
if (s.pos.X>e.pos.X) {
int ox=s.pos.Xi;
s.pos=Point(e.pos.X,s.pos.Y);
e.pos=Point(ox,e.pos.Y);
// swap(s.pos.X, e.pos.X);
}
if (s.pos.Y>e.pos.Y) {
int oy=s.pos.Yi;
s.pos=Point(s.pos.X,e.pos.Y);
e.pos=Point(e.pos.X,oy);
// swap(s.pos.Y, e.pos.Y);
}
+/
int x0=s.pos.Xi, x1=e.pos.Xi, y0=s.pos.Yi, y1=e.pos.Yi;
int dy, dx, incrE, incrNE, dt,x,y;
/+
import std.algorithm : swap;
if (x0>x1)
swap(x0,x1);
if (y0>y1)
swap(y0,y1);
+/
dx = x1 - x0;
dy = y1 - y0;
dt = 2 * (dy - dx);
incrE = 2*dy;
incrNE = 2*(dy - dx);
x = x0;
y = y0;
d.setPos(s.pos);
drawDot(d);
while(x < x1)
{
if (dt <= 0)
{
dt += incrE;
x++;
}
else
{
dt += incrNE;
x++;
y++;
}
d.setPos(Point(x,y));
drawDot(d);
}
} // drawLine
```
