if 你可以抗锯齿画直线 then 你同样可以抗锯齿画圆 else 你根本就没有弄懂抗锯齿的算法,建议你好好看看抗锯齿画直线的算法 end if
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long) As Long Private Declare Function SetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long, ByVal crColor As Long) As Long ' Private Const PI = 3.1415926 / 180Private Sub PsetEx(Pic As PictureBox, X As Single, Y As Single, Optional Color As Long = 0) Dim CenterX As Long, CenterY As Long, CenterColor As Long, CenterAlpha As Single Dim CenterRX As Long, CenterRY As Long, CenterRColor As Long, CenterRAlpha As Single Dim CenterBX As Long, CenterBy As Long, CenterBColor As Long, CenterBAlpha As Single Dim CenterRBX As Long, CenterRBY As Long, CenterRBColor As Long, CenterRBAlpha As Single Dim hDC As Long hDC = Pic.hDC CenterX = Int(X) CenterY = Int(Y) CenterColor = GetPixel(hDC, CenterX, CenterY) CenterAlpha = (CenterX - X + 1) * (CenterY - Y + 1) CenterRX = CenterX + 1 CenterRY = Int(Y) CenterRColor = GetPixel(hDC, CenterRX, CenterRY) CenterRAlpha = (X - CenterRX + 1) * (CenterY - Y + 1) CenterBX = CenterX CenterBy = CenterY + 1 CenterBColor = GetPixel(hDC, CenterBX, CenterBy) CenterBAlpha = (CenterX - X + 1) * (Y - CenterBy + 1) CenterRBX = CenterX + 1 CenterRBY = CenterY + 1 CenterRBColor = GetPixel(hDC, CenterRBX, CenterRBY) CenterRBAlpha = (X - CenterRX + 1) * (Y - CenterBy + 1) SetPixel hDC, CenterX, CenterY, BlendColor(CenterColor, Color, CenterAlpha) SetPixel hDC, CenterRX, CenterRY, BlendColor(CenterRColor, Color, CenterRAlpha) SetPixel hDC, CenterBX, CenterBy, BlendColor(CenterBColor, Color, CenterBAlpha) SetPixel hDC, CenterRBX, CenterRBY, BlendColor(CenterRBColor, Color, CenterRBAlpha) End Sub 'Private Sub GetRGB(Color As Long, Red As Long, Green As Long, Blue As Long) If Color <> 0 Then Red = Color And 255& Green = Color \ 256 And 255 Blue = Color \ 65536 End If End SubPrivate Function BlendColor(ColorBase As Long, ColorBlend As Long, Alpha As Single) As Long Dim BaseR As Long, BaseG As Long, BaseB As Long Dim BlendR As Long, BlendG As Long, BlendB As Long GetRGB ColorBase, BaseR, BaseG, BaseB GetRGB ColorBlend, BlendR, BlendG, BlendB If Alpha > 1 Then Alpha = 1 BaseR = Alpha * (BlendR - BaseR) + BaseR BaseG = Alpha * (BlendG - BaseG) + BaseG BaseB = Alpha * (BlendB - BaseB) + BaseB BlendColor = RGB(BaseR, BaseG, BaseB) End Function 'Private Sub CircleEx(Pic As PictureBox, CenterX As Long, CenterY As Long, Radius As Long, Optional Color As Long = vbRed) Dim i As Long Dim X As Single, Y As Single For i = 0 To 360 X = Cos(i * PI) Y = Sin(i * PI) X = X * Radius + CenterX Y = Y * Radius + CenterY PsetEx Pic, X, Y, Color Next End Sub Private Sub Command1_Click() CircleEx Pic, 100, 100, 50, vbRed Pic.Refresh End Sub
修正一下 Private Sub CircleEx(Pic As PictureBox, CenterX As Long, CenterY As Long, Radius As Long, Optional Color As Long = vbRed) Dim i As Single Dim X As Single, Y As Single For i = 0 To 360 Step 60 / Radius X = Cos(i * PI) Y = Sin(i * PI) X = X * Radius + CenterX Y = Y * Radius + CenterY PsetEx Pic, X, Y, Color Next End Sub
你同样可以抗锯齿画圆
else
你根本就没有弄懂抗锯齿的算法,建议你好好看看抗锯齿画直线的算法
end if
Private Declare Function SetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long, ByVal crColor As Long) As Long
'
Private Const PI = 3.1415926 / 180Private Sub PsetEx(Pic As PictureBox, X As Single, Y As Single, Optional Color As Long = 0)
Dim CenterX As Long, CenterY As Long, CenterColor As Long, CenterAlpha As Single
Dim CenterRX As Long, CenterRY As Long, CenterRColor As Long, CenterRAlpha As Single
Dim CenterBX As Long, CenterBy As Long, CenterBColor As Long, CenterBAlpha As Single
Dim CenterRBX As Long, CenterRBY As Long, CenterRBColor As Long, CenterRBAlpha As Single
Dim hDC As Long
hDC = Pic.hDC
CenterX = Int(X)
CenterY = Int(Y)
CenterColor = GetPixel(hDC, CenterX, CenterY)
CenterAlpha = (CenterX - X + 1) * (CenterY - Y + 1)
CenterRX = CenterX + 1
CenterRY = Int(Y)
CenterRColor = GetPixel(hDC, CenterRX, CenterRY)
CenterRAlpha = (X - CenterRX + 1) * (CenterY - Y + 1)
CenterBX = CenterX
CenterBy = CenterY + 1
CenterBColor = GetPixel(hDC, CenterBX, CenterBy)
CenterBAlpha = (CenterX - X + 1) * (Y - CenterBy + 1)
CenterRBX = CenterX + 1
CenterRBY = CenterY + 1
CenterRBColor = GetPixel(hDC, CenterRBX, CenterRBY)
CenterRBAlpha = (X - CenterRX + 1) * (Y - CenterBy + 1)
SetPixel hDC, CenterX, CenterY, BlendColor(CenterColor, Color, CenterAlpha)
SetPixel hDC, CenterRX, CenterRY, BlendColor(CenterRColor, Color, CenterRAlpha)
SetPixel hDC, CenterBX, CenterBy, BlendColor(CenterBColor, Color, CenterBAlpha)
SetPixel hDC, CenterRBX, CenterRBY, BlendColor(CenterRBColor, Color, CenterRBAlpha)
End Sub
'Private Sub GetRGB(Color As Long, Red As Long, Green As Long, Blue As Long)
If Color <> 0 Then
Red = Color And 255&
Green = Color \ 256 And 255
Blue = Color \ 65536
End If
End SubPrivate Function BlendColor(ColorBase As Long, ColorBlend As Long, Alpha As Single) As Long
Dim BaseR As Long, BaseG As Long, BaseB As Long
Dim BlendR As Long, BlendG As Long, BlendB As Long
GetRGB ColorBase, BaseR, BaseG, BaseB
GetRGB ColorBlend, BlendR, BlendG, BlendB
If Alpha > 1 Then Alpha = 1
BaseR = Alpha * (BlendR - BaseR) + BaseR
BaseG = Alpha * (BlendG - BaseG) + BaseG
BaseB = Alpha * (BlendB - BaseB) + BaseB
BlendColor = RGB(BaseR, BaseG, BaseB)
End Function
'Private Sub CircleEx(Pic As PictureBox, CenterX As Long, CenterY As Long, Radius As Long, Optional Color As Long = vbRed)
Dim i As Long
Dim X As Single, Y As Single
For i = 0 To 360
X = Cos(i * PI)
Y = Sin(i * PI)
X = X * Radius + CenterX
Y = Y * Radius + CenterY
PsetEx Pic, X, Y, Color
Next
End Sub
Private Sub Command1_Click()
CircleEx Pic, 100, 100, 50, vbRed
Pic.Refresh
End Sub
Private Sub CircleEx(Pic As PictureBox, CenterX As Long, CenterY As Long, Radius As Long, Optional Color As Long = vbRed)
Dim i As Single
Dim X As Single, Y As Single
For i = 0 To 360 Step 60 / Radius
X = Cos(i * PI)
Y = Sin(i * PI)
X = X * Radius + CenterX
Y = Y * Radius + CenterY
PsetEx Pic, X, Y, Color
Next
End Sub