Home/ Questions/Q 8401745
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-09T21:53:03+00:00

Let’s say I have point which has the coordinates (50,100) where (0,0) is in

  • 0

Let’s say I have point which has the coordinates (50,100) where (0,0) is in the upper left corner of a view.

How can I get the coordinates of the same point if I want the beginning of the coordinate system to be the center of the screen (ie width/2, height/2) ?

Note that I am implementing a custom View and I am drawing inside it and I just want to convert the coordinate inside that same view. I am basically implementing a graphic calculator and I need to have my coordinate system to start in the middle of the screen so the graphics could look better.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Find the midpoint you will be using, so for a 100×100 screen, this would be (50,50). Then take the point you need to convert and subtract the midpoint X value from the point X value, and then subtract the point Y value from the midpoint Y value. Notice that you are not doing the same operation on both values.

    So if the point is (30,25) the new point would be (-20,25) because 30 – 50 = -20 and 50 – 25 = 25.

    • 0