How to get cursor coordinates in drag/click events in drawing panel?

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How to get cursor coordinates in drag/click events in drawing panel? post and replies

How do I get cursor coordinates due to drag event in a drawing panel? August 19, 2020 9:24PM UTC
mrg_psu 9 Posts	Post title says it all, I'm trying to get coordinates for the cursor at the end of a drag (or directions to documentation or listings that will let me figure it out). I'm trying to port an old EJS app of Paco's that I did some small mods to years ago called particles and walls. In that Java app, there was access to Pos X and Pos Y, but that doesn't exist for the drawing panel. I'm assuming it will be just a method call, but I can't figure out what that might be. Login to reply

Re: How do I get cursor coordinates due to drag event in a drawing panel? - Aug 19 9:55PM UTC

lookang
245 Posts

Dear Prof Michael, i have been using _info.point[0] for x coordinate and _info.point[1] for y coordinate. in addition,

// since EJSS added ability to zoom and pan

// x = Math.round(x) // does not work well

// the coordinates of the mouse is captured in EJSS as (xmouse,ymouse) = (_info.point[0] , _info.point[1] )

x = Math.round(_info.point[0])

my documentation

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Re: How do I get cursor coordinates due to drag event in a drawing panel? - Aug 20 8:22AM UTC

mrg_psu
9 Posts

Thanks Loo Kang!

Your documentation page made it easy: in the OnDrag for the drawingPanel:

position = _view.drawingPanel.getInteraction().getInteractionPoint();

addWalls();

position[0] for x and position[1] for y works perfectly in the service function addWalls()

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Re: How do I get cursor coordinates due to drag event in a drawing panel? - Aug 19 10:05PM UTC

lookang
245 Posts

another method is

//define position in variable page

//copy this into the any of the OnPress or OnDrag depending on what you need

// make sure the name of the plottingPanel is reference correctly, if you change the name, please edit accordingly

position = _view.plottingPanel.getInteraction().getInteractionPoint();

// position[0] = x coordinate of mouse clicked

//position[1] = y coordinate of mouse clicked

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