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ControlNode rendering in Window Forms vs WPF version (Read 3317 times)

stefski YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 31 Location: Norway Joined: Jul 17^th, 2009	ControlNode rendering in Window Forms vs WPF version Jan 3^rd, 2012 at 10:28am	Print Post
	Hi, using Flowchart.NET we are seeing an artifact in relation to the rendering of overlapping ControlNodes: With the two plot ControlNodes on this picture it seems like the FlowChart.NET "part" of the nodes are drawn first and then the controls inside the ControlNodes are drawn (when the Diagram control is finished with its drawing) - thus painting on top of the selection frames. Here is how we expected it to look: Is there anything we might do in our code to solve this issue, or is this a bug in the component? Is the behaviour different in the WPF version - i.e. more along the lines of our expectations?

	Kind regards Steffen Skov OLGA Application Architect Schlumberger Information Solutions AS
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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: ControlNode rendering in Window Forms vs WPF version Reply #1 - Jan 3^rd, 2012 at 10:46am	Print Post
	Hi, Windows Forms controls are rendered in their own windows, and the diagram control cannot draw over these windows. What you can do on your side is to draw these "custom plot" graphs inside DiagramNodes instead of using hosted controls. You have a few options: - use a rectangular custom-drawn ShapeNode and handle the DrawNode event to plot the graph - derive from DiagramNode and implement its Draw method - create a graph Component and show the graphs inside CompositeNodes In WpfDiagram hosted controls can freely mix with other elements in the diagram Z order since they are all part of the same WPF visual tree and are not rendered in separate windows. I hope that helps, Stoyan


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stefski YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 31 Location: Norway Joined: Jul 17^th, 2009	Re: ControlNode rendering in Window Forms vs WPF version Reply #2 - Jan 3^rd, 2012 at 11:46am	Print Post
	Thank you, Stoyan, the plot in this case is another third-party component, so if we were to implement your suggestions I think we would have to implement the plotting ourselves. Anyway, your answer was very helpful, as we are thinking about moving to the WPF version, and this would (if I understand you correctly) be another point for doing that transition.

	Kind regards Steffen Skov OLGA Application Architect Schlumberger Information Solutions AS
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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: ControlNode rendering in Window Forms vs WPF version Reply #3 - Jan 3^rd, 2012 at 12:09pm	Print Post
	If that component can export bitmap images or provides a public OnPaint(Graphics) method, you can still use it to draw inside nodes. E.g. you could keep its instance as a member of your custom node class, and then implement DiagramNode.Draw through that member. Btw. our chart/graph control can do that and also lets you plot using custom functions (see the sine function sample at http://mindfusion.eu/gallery-masterchart.html). I hope that helps, Stoyan


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