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Re: Paint dashed polyline [message #34660 is a reply to message #34656]

Sun, 04 December 2011 11:40

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

koldo wrote on Sun, 04 December 2011 00:39

Hello all

I wanted to paint a dashed polyline, but code like this does not work properly.

How could you do it?

void DrawPolyline(Painter& w, const Vector<Point> &p)
{
	for (int i = 1; i < p.GetCount(); ++i) 
		w.Move(p[i-1]).Line(p[i]).Stroke(2, Black()).Dash("5 2");
}

Hi Koldo!
I think you should call Dash() before Stroke(). Also you don't have to call it after each segment - it will make nicer dashing at the vertices.

So I would write the code like this:

void DrawPolyline(Painter& w, const Vector<Point> &p)
{
	if(!p.GetCount()) return;
	w.Move(p[0]);
	for (int i = 1; i < p.GetCount(); ++i) 
		w.Line(p[i]);
	w.Dash("5 2").Stroke(2, Black());
}

Best regards,
Honza

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