Code: (Select All)
Screen _NewImage(800, 600, 32)
Dim TransRed As _Unsigned Long
Dim TransGreen As _Unsigned Long
Dim TransBlue As _Unsigned Long
TransRed = _RGBA(255, 0, 0, 128)
TransGreen = _RGBA(0, 255, 0, 128)
TransBlue = _RGBA(0, 0, 255, 128)
Call CircleFill(100, 100, 75, TransRed)
Call CircleFill(120, 120, 75, TransBlue)
Call EllipseFill(550, 100, 150, 75, TransBlue)
Call EllipseFill(570, 120, 150, 75, TransGreen)
Call EllipseTilt(200, 400, 150, 75, 0, TransGreen)
Call EllipseTilt(220, 420, 150, 75, 3.14 / 4, TransRed)
Call EllipseTiltFill(0, 550, 400, 150, 75, 3.14 / 6, TransRed)
Call EllipseTiltFill(0, 570, 420, 150, 75, 3.14 / 4, TransGreen)
End
Sub CircleFill (CX As Integer, CY As Integer, R As Integer, C As _Unsigned Long)
' CX = center x coordinate
' CY = center y coordinate
' R = radius
' C = fill color
Dim Radius As Integer, RadiusError As Integer
Dim X As Integer, Y As Integer
Radius = Abs(R)
RadiusError = -Radius
X = Radius
Y = 0
If Radius = 0 Then PSet (CX, CY), C: Exit Sub
Line (CX - X, CY)-(CX + X, CY), C, BF
While X > Y
RadiusError = RadiusError + Y * 2 + 1
If RadiusError >= 0 Then
If X <> Y + 1 Then
Line (CX - Y, CY - X)-(CX + Y, CY - X), C, BF
Line (CX - Y, CY + X)-(CX + Y, CY + X), C, BF
End If
X = X - 1
RadiusError = RadiusError - X * 2
End If
Y = Y + 1
Line (CX - X, CY - Y)-(CX + X, CY - Y), C, BF
Line (CX - X, CY + Y)-(CX + X, CY + Y), C, BF
Wend
End Sub
Sub EllipseFill (CX As Integer, CY As Integer, a As Integer, b As Integer, C As _Unsigned Long)
' CX = center x coordinate
' CY = center y coordinate
' a = semimajor axis
' b = semiminor axis
' C = fill color
If a = 0 Or b = 0 Then Exit Sub
Dim h2 As _Integer64
Dim w2 As _Integer64
Dim h2w2 As _Integer64
Dim x As Integer
Dim y As Integer
w2 = a * a
h2 = b * b
h2w2 = h2 * w2
Line (CX - a, CY)-(CX + a, CY), C, BF
Do While y < b
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
Sub EllipseTilt (CX, CY, a, b, ang, C As _Unsigned Long)
' CX = center x coordinate
' CY = center y coordinate
' a = semimajor axis
' b = semiminor axis
' ang = clockwise orientation of semimajor axis in radians (0 default)
' C = fill color
For k = 0 To 6.283185307179586 + .025 Step .025
i = a * Cos(k) * Cos(ang) + b * Sin(k) * Sin(ang)
j = -a * Cos(k) * Sin(ang) + b * Sin(k) * Cos(ang)
i = i + CX
j = -j + CY
If k <> 0 Then
Line -(i, j), C
Else
PSet (i, j), C
End If
Next
End Sub
Sub EllipseTiltFill (destHandle&, CX, CY, a, b, ang, C As _Unsigned Long)
' destHandle& = destination handle
' CX = center x coordinate
' CY = center y coordinate
' a = semimajor axis
' b = semiminor axis
' ang = clockwise orientation of semimajor axis in radians (0 default)
' C = fill color
Dim max As Integer, mx2 As Integer, i As Integer, j As Integer
Dim prc As _Unsigned Long
Dim D As Integer, S As Integer
D = _Dest: S = _Source
prc = _RGB32(255, 255, 255, 255)
If a > b Then max = a + 1 Else max = b + 1
mx2 = max + max
tef& = _NewImage(mx2, mx2)
_Dest tef&
_Source tef&
For k = 0 To 6.283185307179586 + .025 Step .025
i = max + a * Cos(k) * Cos(ang) + b * Sin(k) * Sin(ang)
j = max + a * Cos(k) * Sin(ang) - b * Sin(k) * Cos(ang)
If k <> 0 Then
Line (lasti, lastj)-(i, j), prc
Else
PSet (i, j), prc
End If
lasti = i: lastj = j
Next
Dim xleft(mx2) As Integer, xright(mx2) As Integer, x As Integer, y As Integer
For y = 0 To mx2
x = 0
While Point(x, y) <> prc And x < mx2
x = x + 1
Wend
xleft(y) = x
While Point(x, y) = prc And x < mx2
x = x + 1
Wend
While Point(x, y) <> prc And x < mx2
x = x + 1
Wend
If x = mx2 Then xright(y) = xleft(y) Else xright(y) = x
Next
_Dest destHandle&
For y = 0 To mx2
If xleft(y) <> mx2 Then Line (xleft(y) + CX - max, y + CY - max)-(xright(y) + CX - max, y + CY - max), C, BF
Next
_Dest D: _Dest S
_FreeImage tef&
End Sub
Those are the routines we worked up ages ago for Circles and Ellipses. They should handle whatever you need for them too, and they've been optimized for speed with QB64PE.
