rotating coordinates by 270 degree

[Vincent94]

Hello 🙂 I'm trying to use mouse coordinates to draw on XY graph 270 degrees. Meaning if i move my mouse to the left, the graph will draw upwards, if i move my mouse to the right, it will draw downwards

I found this online : https://decibel.ni.com/content/docs/DOC-11437

and implemented on my VI, but i can't seems to get it working. (Originally, it can draw fine, but after adding the rotation, it doesn't draw anymore) Attached is my original VI and also the edited VI. Can someone helped me to troubleshoot?

[crossrulz]

It is drawing.  It is just not within the scale of your graph.  Here are some tweaks I made.

1. Expand the scale of the graph to have the positive and negative.
2. Read the initial location of the mouse.  You then subtract this location with each read.  This will make your first data point the at the origin (0,0).
3. No need for the shift cartesian.  Remove those.
4. Multiply the elements by your scale before adding them to the arrays.  This will save you many many multiplies versus multiplying over the whole array.
5. 270 degrees is -pi/2.  Your default theta was set to pi/2.

I also did some general cleaning up.

[Vincent94]

Thanks for that, but is it possible to not have negative scale but achieving the similar results?

By The way, Thanks for helping me to clean up, my Technical Officer has been complaining about my programming which is extremely messy!

[Vincent94]

And regarding your point number 2, i don't get how the looping reads minus the initial reads will get me a starting point of (0,0)