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 Tools for Windows
 Charting and Real-Time Graphics Tools for Windows
 drawing on the graph via mouse input
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4 Posts

Posted - 25 Nov 2010 :  11:47:07  Show Profile  Reply with Quote
I've been attempting to allow the drawing of a line, using the mouse, in the same window that the quinn curtis dll draws the graph, but i've had no success (i.e. the line does not show up).
I tried to do something similar using the quinn curtis functions, but it would mean creating a new object (WGPolyline) on the fly, but this new object would need to be created after the graph has been created (i get an "serious error" message when i do this).
Is it even possible to use the device context (the same window/device context that the quinn curtis dll is using) to make window GDI calls to draw on the graph with the mouse?


1534 Posts

Posted - 25 Nov 2010 :  20:31:49  Show Profile  Reply with Quote
Arbitrarily adding a chart object (WGPolyline in your example) to a graph, after the graph has been defined in the graph building routine, will cause a runtime error with our software. You can however add chart objects after a graph has been created if you place them between WGPreAddGraphObject and WGPostAddGraphObject calls. See the manual for details regarding these two functions.
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