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Attach to link (Read 18057 times)

Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Attach to link Sep 11^th, 2015 at 9:23am	Print Post
	Hi, I have a problem, i want to attach a node to a link and I use this code: int startposition = l.getOriginIndex(); if(nID >= 1){ s.attachTo(l, AttachToLink.Segment, startposition); } but it doesn't work, it gave me null pointer exception.


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Attach to link Reply #1 - Sep 11^th, 2015 at 10:13am	Print Post
	Hi, Check if both s and l are different from null. Also getOriginIndex doesn't return anything related to link segment indices, which attachTo expects when using AttachToLink.Segment option; pass 0 instead if you want to attach the node to first segment. I hope that helps, Stoyan


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #2 - Sep 11^th, 2015 at 10:14am	Print Post
	Ok, thank you very much...i'll try


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #3 - Sep 11^th, 2015 at 1:04pm	Print Post
	Sorry, I still have a problem with attachTo, I want to attach a node in the middle of a link...now it doesn't give me null pointer exception but it doesn't show the node, here is the code: ShapeNode addedNode = new ShapeNode(diagram); addedNode.setShape(Shape.fromId("Ellipse")); addedNode.resize(2, 2); addedNode.attachTo(l, AttachToLink.Point, 0); diagram.add(addedNode);


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Attach to link Reply #4 - Sep 11^th, 2015 at 1:47pm	Print Post
	The node's probably at default 0,0 position. You should also move it to where you want it, e.g. at mid-point of a segment, before calling attachTo. attachTo does not move the node but only records its current offset from specified point and maintains that offset when the master item is modified later. E.g. that also lets you keep attached nodes at some distance above or below link segments or points to serve as labels. I hope that helps, Stoyan


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #5 - Sep 11^th, 2015 at 2:23pm	Print Post
	Ok, thank you but the problem is that I have something like the first picture and i want to add a node in order to obtain something like the second picture

	example_005.png (Attachment deleted)
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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Attach to link Reply #6 - Sep 14^th, 2015 at 9:02am	Print Post
	If you are asking how to move addedNode to the middle point of link, it should look something like this: Code PointF pt1 = l.getControlPoints().get(0); PointF pt2 = l.getControlPoints().get(1); PointF m = new PointF((pt1.x + pt2.x) / 2, (pt1.y + pt2.y) / 2)); m.x -= addedNode.getBounds().width() / 2; m.y -= addedNode.getBounds().height() / 2; addedNode.moveTo(m.x, m.y); assuming that link has a single straight-line segment. I hope that helps, Stoyan


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #7 - Sep 14^th, 2015 at 12:41pm	Print Post
	Ok, thank you, I'll try


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #8 - Sep 29^th, 2015 at 2:54pm	Print Post
	Hi, I used the code you suggested to me above and it works but then if I add another ellipse apart from that drawing it blocks. While if I add rectangle of decision it doesn't block. It gave me this message: 09-29 16:54:01.143 17399-17399/com.example.silvia.er I/ViewRootImpl﹕ Reporting drop result: false


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #9 - Sep 29^th, 2015 at 3:02pm	Print Post
	Sorry, I solved. Thank you anyway


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #10 - Oct 6^th, 2015 at 10:01am	Print Post
	Hi, is there a way to create a link like the red one of the attachment?

	example3.png (Attachment deleted)
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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Attach to link Reply #11 - Oct 6^th, 2015 at 12:13pm	Print Post
	Hi, Assuming it connects small nodes attached to the other links, set its Shape property to LinkShape.Cascading value and SegmentCount to 2 after creating it. Then the link's segments should stay horizontal and vertical when its ends are moved. I hope that helps, Stoyan


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #12 - Oct 7^th, 2015 at 8:15am	Print Post
	Hi, is there a way to know to which side of the node a link is attached?


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Attach to link Reply #13 - Oct 7^th, 2015 at 10:32am	Print Post
	Hi, Call the following method with node.Bounds and respective end point of link as arguments: Code enum RectSide { LEFT { float dist(PointF point, RectF rect) { return Math.abs(point.x - rect.left); } }, TOP { float dist(PointF point, RectF rect) { return Math.abs(point.y - rect.top); } }, RIGHT { float dist(PointF point, RectF rect) { return Math.abs(point.x - rect.right); } }, BOTTOM { float dist(PointF point, RectF rect) { return Math.abs(point.y - rect.bottom); } }; static RectSide fromPoint(PointF point, RectF rect) { float minDist = Float.MAX_VALUE; RectSide closest = LEFT; for (RectSide side: values()) { float dist = side.dist(point, rect); if (dist < minDist) { minDist = dist; closest = side; } } return closest; } abstract float dist(PointF point, RectF rect); } I hope that helps, Stoyan


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Silvia88 Full Member Offline I Love MindFusion! Posts: 121 Joined: Aug 31^st, 2015	Re: Attach to link Reply #14 - Oct 7^th, 2015 at 2:19pm	Print Post
	Hi, I create a picture like the first two of the attachments, rect1 and rect2, using LinkShape.Cascading and setting as orientation vertical and it works in the first two cases but it doesn't work in case rect3 and rect4, how can I solve this problem? How can I distinguish if decision is above, below, right or left with respect to the rectangle?

	Untitled_017.png (Attachment deleted)
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