CODEWITHSUNDEEP
pythontkintermouseevent
Matei Cananau
Matei Cananau

Reputation: 85

Tkinter map mouse coordinates to figure size

I'm using Tkinter where an ASCII figure is printed on a label. I want it to change depending on where I click with the mouse, but I do not know how to tackle that problem. How would I map the mouse's coordinates so that it is restricted by a range, say [-n, n]? I am printing my mouse's (event.x, event.y) and I need those values restricted by the earlier stated interval. So instead of the values I get by moving my mouse ranging from 300 to 400, how can I map them to range from -15 to 15, for example?

Thank you in advance!

Edit: Here is what the program looks like - the center is the (0, 0) coordinate and I only want to be able to click on the sphere to rotate it. Therefore, I want to have my interval range from [-r, r] when clicking width the mouse. enter image description here

Upvotes: 0

Views: 157

Answers (1)

Langueneers
Langueneers

Reputation: 81

Depends on your intervals. lets assume you have [-15,15], and mouse movement from 0-300, you map -15,15 onto [-150,150], which means that every spatial entity you move your mouse (1/150) is 15/150 = 0.1 step in the scale of your choice [-n,n], which you multiply with your mouse coordinate to get the corresponding value within your range [-n, n]. therefore its n*(n/m) with n being target interval and m being the coordinate interval. Why negative values? You must determine your [0,0] for your coordinate system, and this also depends on whether you want to increase size only or also shrink the figure. Maybe give some additional information or a code snippet!

Upvotes: 2

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