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Normal Topic Anchor expansion (Read 2373 times)
j poz
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Anchor expansion
Jan 21st, 2015 at 6:24pm
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We want to implement a feature so that when a user hovers their mouse over an anchor, the anchor is grows in size to indicate we are over it. Do you have any suggestions for how to implement this functionality?
  
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Stoyo
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Re: Anchor expansion
Reply #1 - Jan 22nd, 2015 at 12:00pm
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You could implement it by setting MarkStyle.Custom and handling DrawAnchorPoint event:

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new AnchorPattern(new[]
	{ new AnchorPoint(50, 100, true, true, MarkStyle.Custom)},
	"test");
diagram.DrawAnchorPoint += OnDrawAnchorPoint;

private void OnDrawAnchorPoint(object sender, DrawAnchorPointEventArgs e)
{
	var mouseViewPosition = diagramView.PointToClient(MousePosition);
	var mousePosition = diagramView.ClientToDoc(mouseViewPosition);

	var rect = new RectangleF(e.Location, new SizeF(0, 0));
	if (Utilities.Distance(mousePosition, e.Location) < 3)
		rect.Inflate(3, 3);
	else
		rect.Inflate(1.5f, 1.5f);
	e.Graphics.DrawRectangle(Pens.Red, rect);
}

private void diagramView_MouseMove(object sender, MouseEventArgs e)
{
	var mousePosition = diagramView.ClientToDoc(e.Location);
	var node = diagram.GetNodeAt(mousePosition, 5);
	if (node != null && node.AnchorPattern != null)
	{
		var r = node.GetRepaintRect(false);
		r.Inflate(3, 3);
		diagram.Invalidate(r);
	}
}


Alternatively you could draw a filled shape from DrawForeground handler to cover the standard anchor point.

I hope that helps,
Stoyan
  
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j poz
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Re: Anchor expansion
Reply #2 - Feb 2nd, 2015 at 6:19pm
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Thank you. We were able to make this work. However, we want to make the expanded anchor appear over the diagramlink, but the diagram link seems to be drawn after DrawAnchorPoint so it gets drawn over our expanded anchor.

Is there a way to make this work the way we want it?
  
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Stoyo
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Re: Anchor expansion
Reply #3 - Feb 3rd, 2015 at 11:38am
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You could draw it from DrawLink handler instead:

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private void OnDrawAnchorPoint(object sender, DrawAnchorPointEventArgs e)
{
	var mouseViewPosition = diagramView.PointToClient(MousePosition);
	var mousePosition = diagramView.ClientToDoc(mouseViewPosition);

	var rect = new RectangleF(e.Location, new SizeF(0, 0));
	if (Utilities.Distance(mousePosition, e.Location) < 3)
	{
		rect.Inflate(3, 3);
		highlightAnchorPoint = rect;
	}
	else
	{
		rect.Inflate(1.5f, 1.5f);
		e.Graphics.DrawRectangle(Pens.Red, rect);
	}
}

RectangleF? highlightAnchorPoint;

private void diagram_InitializeLink(object sender, LinkEventArgs e)
{
	e.Link.CustomDraw = CustomDraw.Additional;
}

private void diagram_DrawLink(object sender, DrawLinkEventArgs e)
{
	if (highlightAnchorPoint != null && !e.Shadow)
		e.Graphics.DrawRectangle(Pens.Red, highlightAnchorPoint.Value);
}


private void diagramView_MouseMove(object sender, MouseEventArgs e)
{
	var mousePosition = diagramView.ClientToDoc(e.Location);
	var node = diagram.GetNodeAt(mousePosition, 5);
	if (node != null && node.AnchorPattern != null)
	{
		var r = node.GetRepaintRect(false);
		r.Inflate(3, 3);
		diagram.Invalidate(r);
	}
	else if (highlightAnchorPoint != null)
	{
		diagram.Invalidate();
		highlightAnchorPoint = null;
	}
}


I hope that helps,
Stoyan
  
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