Central equation of the ellipse

[Petr]

Code: (Select All)

Screen _NewImage(1000, 1000, 32)



cx = 500 'center x and center y

cy = 500



m = 200 'X radius

n = 100 'y radius



Dim col As _Unsigned Long



For oy = 250 To 750 'ox, oy points in rectangle. If the point is part of an ellipse, it will be white, otherwise it will be black

    For ox = 250 To 750

        aa = ((ox - cx) ^ 2) / m ^ 2

        bb = ((oy - cy) ^ 2) / n ^ 2

        If aa + bb < 1 Then col = _RGB32(255) Else col = _RGB32(0)

        PSet (ox, oy), col

    Next

Next

I often use point detection in a circle, this can easily be modified to detect a point in an ellipse. Maybe it will be useful for someone.

[TerryRitchie]

Code: (Select All)

Screen _NewImage(1000, 1000, 32)



cx = 500 'center x and center y

cy = 500



m = 200 'X radius

n = 100 'y radius



Dim col As _Unsigned Long



For oy = 250 To 750 'ox, oy points in rectangle. If the point is part of an ellipse, it will be white, otherwise it will be black

    For ox = 250 To 750

        aa = ((ox - cx) ^ 2) / m ^ 2

        bb = ((oy - cy) ^ 2) / n ^ 2

        If aa + bb < 1 Then col = _RGB32(255) Else col = _RGB32(0)

        PSet (ox, oy), col

    Next

Next

I often use point detection in a circle, this can easily be modified to detect a point in an ellipse. Maybe it will be useful for someone.

Very cool and simple. Thank you.

[Pete]

Hey, Czech Pete's back!

I was on "walkabout" for about a year, myself. Good to hear from you again.

Pete