Question about "GetAngle2D"

[ale870]

Hello,
I found this function, but I don't understand how it works.

Help says:

"GetAngle2D() returns the angle (in degrees) of two given points. X1 and Y1 define the position of Point 1, while X2 and Y2 define the position of Point 2. "

But... how can I create an angle using two points?  ???

[kevin]

 see   Projects/Math/GetAngle2D

PlayBASIC Code: [Select]

   CreateConvexShape 1,50,3
  
    shapePosX#=400
   shapePosY#=400
     
     

   Do
      Cls 0

         mx#=MouseX()
         my#=MouseY()
      
         CircleC mx#,my#,10,1,RGB(255,0,0)
         
         angle#=GetAngle2D(shapePosX#,shapePosY#,mx#,my#)

         RotateShape 1,angle#,1
         DrawShape 1,shapePosX#,shapePosY#,2

         Line shapePosX#,shapePosY#,CosNewValue(shapePosX#,angle#,100),SinNewValue(shapePosy#,angle#,100)
      Sync
   Loop

  - See PlayBASIC Help Files GETANGLE2D

[ale870]

Thank you!
I will check and study  :D