Ellipse trouble

[bplus]

If you need tilted ones I have that too (https://staging.qb64phoenix.com/showthre...04#pid1204) here are filled ellipsii

Code: (Select All)

_Title "Fill Ellipse Demo" ' b+ 2022-08-23
Screen _NewImage(800, 600, 32)
_ScreenMove 200, 50
Do
    fEllipse Rnd * _Width, Rnd * _Height, Rnd * 100, Rnd * 100, _RGB32(Rnd * 255, Rnd * 255, Rnd * 255, Rnd * 255)
    _Limit 30
Loop


Sub fEllipse (CX As Long, CY As Long, xr As Long, yr As Long, C As _Unsigned Long)
    If xr = 0 Or yr = 0 Then Exit Sub
    Dim h2 As _Integer64, w2 As _Integer64, h2w2 As _Integer64
    Dim x As Long, y As Long
    w2 = xr * xr: h2 = yr * yr: h2w2 = h2 * w2
    Line (CX - xr, CY)-(CX + xr, CY), C, BF
    Do While y < yr
        y = y + 1
        x = Sqr((h2w2 - y * y * w2) \ h2)
        Line (CX - x, CY + y)-(CX + x, CY + y), C, BF
        Line (CX - x, CY - y)-(CX + x, CY - y), C, BF
    Loop
End Sub

xr = xradius yr = yradius don't have to guess with fractions that Circle uses.