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Code-Beispiel

Code-Beispiele » Grafik und Fonts

FBImage (Sprite) PixelKollision

Lizenz:Erster Autor:Letzte Bearbeitung:
k. A.MitgliedEternal_Pain 15.05.2013

Ein relativ einfaches Beispiel für eine Pixelperfect Sprite Kollisions-Funktion

Die Funktion überprüft zunächst ob die Rects (Boundingbox) der beiden Images miteinander Kollidieren und dann ob sich nicht-transparente Pixel 'überlappen' und somit eben kollidieren...

Function FBImageCollision(byref Image1 as any ptr, byref ScreenPos1X as Integer, byref ScreenPos1Y as Integer, _
                          byref Image2 as any ptr, byref ScreenPos2X as Integer, byref ScreenPos2Y as Integer, _
                          byval TransparentColor as Integer = &hFF00FF) as Integer'Bool

    Dim as Integer Image1Width, Image1Height
    Dim as Integer Image2Width, Image2Height

    ImageInfo Image1, Image1Width, Image1Height
    ImageInfo Image2, Image2Width, Image2Height

    Dim as Integer Xl, Yo, Xr, Yu

    Xl = ScreenPos1X
    Yo = ScreenPos1Y
    Xr = ScreenPos2X + Image2Width
    Yu = ScreenPos2Y + Image2Height

    If (ScreenPos2X < ScreenPos1X) Then Xl = ScreenPos2X
    If (ScreenPos2Y < ScreenPos1Y) Then Yo = ScreenPos2Y
    If ((ScreenPos1X+Image1Width ) > (ScreenPos2X + Image2Width )) Then Xr = ScreenPos1X + Image1Width
    If ((ScreenPos1Y+Image1Height) > (ScreenPos2Y + Image2Height)) Then Yu = ScreenPos1Y + Image1Height

    Dim as Integer PosX, PosY
    Dim as Integer Col1, Col2

    If ((Image1Width+Image2Width) > (Xr-Xl)) and ((Image1Height + Image2Height) > (Yu - Yo)) Then
        'RectCollision...

        For Y as Integer = 0 to (Yu-Yo)
        For X as Integer = 0 to (Xr-Xl)
            PosX = Xl + X
            PosY = Yo + Y

            If  (PosX >= ScreenPos1X) and (PosY >= ScreenPos1Y) and (PosX < (ScreenPos1X+Image1Width)) and (PosY < (ScreenPos1Y+Image1Height)) _
            and (PosX >= ScreenPos2X) and (PosY >= ScreenPos2Y) and (PosX < (ScreenPos2X+Image2Width)) and (PosY < (ScreenPos2Y+Image2Height)) Then

                If  (((Xl+X) - ScreenPos1X) > -1) and (((Xl+X) - ScreenPos1X) < Image1Width ) _
                and (((Yo+Y) - ScreenPos1Y) > -1) and (((Yo+Y) - ScreenPos1Y) < Image1Height) Then
                    Col1 = Point((Xl+X) - ScreenPos1X,(Yo+Y) - ScreenPos1Y,Image1) and &hFFFFFF
                Else
                    Col1 = TransparentColor and &hFFFFFF
                End If

                If  (((Xl+X) - ScreenPos2X) > -1) and (((Xl+X) - ScreenPos2X) < Image2Width ) _
                and (((Yo+Y) - ScreenPos2Y) > -1) and (((Yo+Y) - ScreenPos2Y) < Image2Height) Then
                    Col2 = Point((Xl+X) - ScreenPos2X,(Yo+Y) - ScreenPos2Y,Image2) and &hFFFFFF
                Else
                    Col2 = TransparentColor and &hFFFFFF
                End If


                If (Col1<>(TransparentColor and &hFFFFFF)) and (Col2<>(TransparentColor and &hFFFFFF)) Then Return (Not 0)'PixelCollision...
            End If
        Next X
        Next Y
    End If

    Return 0 'No Collision
End Function


Zusätzliche Informationen und Funktionen
  • Das Code-Beispiel wurde am 15.05.2013 von MitgliedEternal_Pain angelegt.
  • Die aktuellste Version wurde am 15.05.2013 von MitgliedEternal_Pain gespeichert.
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