Ellipse is moving and I do not know why

Question

hello Community,

The code below is not a big thing, I know, but the result is not what one expected.groesse = 5

For i = 2 To 6
     GraphicsWindow.FillEllipse(100,150,groesse,groesse)
     groesse = groesse * i
        
  EndFor 

This circle is moving instead just growing and I do not know why.

Small Basic Version 0.7

maybe a bug or is x and y not the center of the ellipse?

Thanks for help

 

 

Answer 1

You are correct in saying that x and y are not the centre of the shape. It represents the top left corner of the bounding box for the shape (before any rotation, if applicable, is applied).

The following code demonstrates how to centre a shape as well as demonstrating the difference:

size = 100
x = GraphicsWindow.Width / 2 ' Centre of window
y = GraphicsWindow.Height / 2
' Offset
GraphicsWindow.FillEllipse(x, y, size, size)
' Centred
GraphicsWindow.FillEllipse(x - (size/2), y - (size/2), size, size) 

Best,

Jason.

Answer 2

Thanks Jason for your quick reply.