Draw by hand onto x/y-graph

[Labphew]

Hey all,

I create a control program for a piezo mirror that moves the focus of a laser beam on a sample. I included several possibilities to create figures that the beam will then carf into the material.

Now I would like to include additionally the possibility to draw a figure by hand /mouse onto a x/y-graph that can then be read out by the program as an x/y-Array.

Is this easily possible or would this require a lot of effort? Does someone know how to implement this?

Thank you in advance.

[GerdW]

Hi Labphew,

ou can use mouse move events to track your mouse movement.

Use them to draw your XY graph background image…

[Labphew]

Hey GerdW,

would you mind to give me a minimal working example (only if it is quickly done)? 

Thank you for your answer,

Labphew

[crossrulz · Accepted solution]

I would use a free cursor and then use the Cursor Release event.  This way the array won't get huge with every tiny movement.  You just take the position when the user lets go of the cursor.

[GerdW · Accepted solution]

See this small VI for tracking mouse movement…

[Labphew]

Hey again,

thank you very much. It helped me to figure out my problem. However "coordinates" are not the coordinates in the xy-graph, but the vertical and horizontal coordinates of the pane. I cannot use these position-coordinates to plot the graph etc.

The better property for my problem is "CursLoc" where I have to drag and drop the Cursor to draw something but at least "CursLoc" then gives the correct coordinates.

Nethertheless thank you very much.

[GerdW]

Labphew,

you just need to subtract a fixed offset: coordinates in graph := mouse position - position of the graph

[Labphew]

@crossrulz

thank you for your answer. Together with the minimal working example of GerdW I solved my problem.

I used curser movement as event but included a "wait" in the event case, so that the number of points can be reduced.

I don't know who of you two I should mark as solution...

[crossrulz]

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Labphew wrote:

I don't know who of you two I should mark as solution...

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You can mark both as solutions.

[NIquist]

Shame that Draw Graph with Events.vi is no longer in the Example Finder.  It does exactly what the OP wants.  I've used (stolen?) it to jumpstart many mouse-drawing programs.  Found many mentions of it on-line but no code.