Home/ Questions/Q 808779
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-15T00:37:07+00:00

In this SO question, someone asked for calculating an angle from three points .

  • 0

In this SO question, someone asked for calculating an angle from three points. I need to do the opposite thing.

I want to draw a clock, and I have tiny tick images. An art dude made 60 of them, each with an individual and accurate shadow. So there are 60 distinct images at 10×10 points in size, already correctly rotated in the center of that square.

So every 6 degrees one tick image has to be placed. I would just need to calculate the x/y coordinate based on a center point, an radius and an angle.

So I have:

  • an center point
  • an radius
  • an angle

Is there an easy way to calculate the x/y coordinate with this? Maybe cocoa-touch already has a useful function or method for this?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    let a be the angle, (x,y) the center point and r the radius, then your point will be at

    (x + r*cos(a), y + r*sin(a))
    • 0