Цвет пиксела?

[Stas]

Как получить цвет пиксела

[Firestorm]

Declare Function GetPixel Lib "gdi32" Alias "GetPixel" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long

пример:

Код: Выделить всё

'This project needs:
'- two picture boxes
'- a button


Private Type POINTAPI
    X As Long
    Y As Long
End Type

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 Declare Function PaintDesktop Lib "user32" (ByVal hdc As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Private Declare Function GetBkColor Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function MoveToEx Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long, lpPoint As POINTAPI) As Long
Private Declare Function LineTo Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long) As Long

Const ScrCopy = &HCC0020
Const Yellow = &HFFFF&
Private Sub Form_Load()
    'KPD-Team 1998
    'URL: http://www.allapi.net/
    'E-Mail: KPDTeam@Allapi.net
    Dim Cnt1 As Byte, Cnt2 As Byte, Point As POINTAPI
    'Set the graphic mode to persistent
    Me.AutoRedraw = True
    'API uses pixels
    Me.ScaleMode = vbPixels
    Picture1.ScaleMode = vbPixels
    Picture2.ScaleMode = vbPixels
    'No borders
    Picture1.BorderStyle = 0: Picture2.BorderStyle = 0
    'Set the button's caption
    Command1.Caption = "Paint && Stretch"
    'Set the graphic mode to 'non persistent'
    Picture1.AutoRedraw = False: Picture2.AutoRedraw = False
    For Cnt1 = 0 To 100 Step 3
        For Cnt2 = 0 To 100 Step 3
            'Set the start-point's coцrdinates
            Point.X = Cnt1: Point.Y = Cnt2
            'Move the active point
            MoveToEx Me.hdc, Cnt1, Cnt2, Point
            'Draw a line from the active point to the given point
            LineTo Me.hdc, 200, 200
        Next Cnt2
    Next Cnt1
    For Cnt1 = 0 To 100 Step 5
        For Cnt2 = 0 To 100 Step 5
            'Draw a pixel
            SetPixel Me.hdc, Cnt1, Cnt2, Yellow
        Next Cnt2
    Next Cnt1
End Sub
Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim XX As Long, YY As Long, A As Long
    XX = X: YY = Y
    'Set the picturebox' backcolor
    Picture2.BackColor = GetPixel(Picture1.hdc, XX, YY)
End Sub
Private Sub Picture1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = 1 Then
        Dim XX As Long, YY As Long, A As Long
        XX = X: YY = Y
        'Set the picturebox' backcolor
        Picture2.BackColor = GetPixel(Picture1.hdc, XX, YY)
    End If
End Sub
Private Sub Picture1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim XX As Long, YY As Long, A As Long
    XX = X: YY = Y
    'Set the picturebox' backcolor
    Picture2.BackColor = GetPixel(Picture1.hdc, XX, YY)
End Sub
Private Sub Command1_Click()
    'Set the width and height
    Picture2.Width = 100: Picture2.Height = 100
    Picture1.Width = 50: Picture1.Height = 50
    'No pictures
    Picture1.Picture = LoadPicture("")
    DoEvents
    Copy the desktop to our picturebox
    PaintDesktop Picture1.hdc
    'Stretch the picture
    StretchBlt Picture2.hdc, 0, 0, 100, 100, Picture1.hdc, 0, 0, 50, 50, ScrCopy
End Sub


[Cyrax]

а можно и проще

у объектов Form и PictureBox (и у некоторых других, которые поддерживают графические методы) есть метод Point, который возвращает цвет пикселя в указанных координатах

Код: Выделить всё

Color = Form1.Point(100,100)

правда есть одно "но". метод привазан к ScaleMode объекта...

[Firestorm]

2Cyrax
...ну в пределах формы...

[Cyrax]

2Cyrax
...ну в пределах формы...

ну естестенно
а вроде ничего другого и не подразумевал