Recording mouse position coordinates in plots?

Specific Domains Visualization
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12

Correct @davide:

First example

The first example does not work at the moment. I think it is supposed to work, but the "button-press-event" signal already has a connection in the InspectDR code. I think this is a bug with Gtk. I am almost certain you are supposed to be able to connect multiple callback functions to the same “signal”. I merely included the example in case you better understood how Gtk worked, and knew how to get around the problem.

Second example

As for the second example: that one will definitively work. I call it a “hack” because you actually have to add your code (or possibly a call to your user-defined function) directly in InspectDR’s src/gtk_input.jl file.

Sightly less hack-y

…But since we are talking Julia here, I suppose you could use the “dynamic patching” (guerrilla patch/monkey patch) technique to overwrite the function from your own code, instead of directly modifying the InspectDR code:

using InspectDR
using Gtk

function InspectDR.handleevent_mousepress(::InspectDR.ISNormal, pwidget::InspectDR.PlotWidget, event::Gtk.GdkEventButton)
#	@show event.state, event.button, event.event_type
	InspectDR.focus_strip(pwidget, event.x, event.y)
	InspectDR.set_focus(pwidget) #In case not in focus

	if 3==event.button
		InspectDR.boxzoom_setstart(pwidget, event.x, event.y) #Changes state
	elseif 1==event.button
		if InspectDR.modifiers_pressed(event.state, InspectDR.MODIFIER_SHIFT)
			InspectDR.mousepan_setstart(pwidget, event.x, event.y) #Changes state
		elseif !InspectDR.modifiers_pressed(event.state, InspectDR.MODIFIERS_SUPPORTED) #Un-modified

		#!!! ADD CODE HERE !!!
@show pwidget.mouseover.pos #NOTE: Typically a Point2D struct, but might be nothing.


			InspectDR.handleevent_mousepress(pwidget, InspectDR.CtrlElement, event.x, event.y)
		end
	end
end

Note that I now had to add a direct reference to InspectDR for all function calls/structure definitions/etc defined in the InspectDR module. These functions/structures/… are not exported by InspectDR - so they are not otherwise available from your own function’s scope.

Hope that helps.