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mattapayne
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"Split" an existing arrow into two new a
Mar 20th, 2007 at 3:59pm
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Hi,

More fun with arrows!

Here's the scenario:

I need to allow a user to "split" an arrow - in other words, to select an arrow and cut it in half, effectively creating 2 new arrows joined at the separation point by a new Box.

This is simple in the case of a single segmented arrow, but I'm having trouble in the case of an arrow that has multiple segments where the user has created a shape. In this case I need to split it at the midpoint, but maintain the original shape.

So far I've had awesome help from this forum. I'm hoping that this is a doable scenario.

Thanks,
Matt
  
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Stoyo
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Re: "Split" an existing arrow into two n
Reply #1 - Mar 20th, 2007 at 6:21pm
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Hi,

You might implement that by saving the control point positions for the original arrow, and assigning them back to the control points of the new arrows, e.g.

Code
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private void splitAt(Arrow arrow, short segment, PointF point)
{
	if (arrow.Style == ArrowStyle.Polyline)
	{
		PointCollection points = arrow.ControlPoints.Clone();
		Box box = fc.CreateBox(point.X - 2, point.Y - 2, 4, 4);
		Arrow newArrow = fc.CreateArrow(box, arrow.Destination);
		arrow.Destination = box;

		arrow.SegmentCount = (short)(segment + 1);
		newArrow.SegmentCount = (short)(arrow.SegmentCount - segment);

		for (int i = 0; i < arrow.ControlPoints.Count - 1; ++i)
			arrow.ControlPoints[i] = points[i];
		arrow.UpdateFromPoints();

		for (int i = segment + 1; i < points.Count; ++i)
			newArrow.ControlPoints[i - segment] = points[i];
		newArrow.UpdateFromPoints();
	}
}


I hope that helps,
Stoyan
  
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mattapayne
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Re: "Split" an existing arrow into two n
Reply #2 - Mar 20th, 2007 at 6:45pm
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Yeah, that's kind of what I was going for. I had created two new arrows and removed the old one, but I guess I could always just keep the old one and only create a single new one, then just reassign the control points.

Thanks as always.

Matt
  
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Stoyo
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Re: "Split" an existing arrow into two n
Reply #3 - Mar 21st, 2007 at 5:05am
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In case anyone needs to get the segment index from the point coordinates - it is returned through an output parameter by one of the GetArrowAt overloaded methods.

I hope that helps,
Stoyan
  
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