70 lines
1.8 KiB
Text
70 lines
1.8 KiB
Text
Structure VCoo
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x.i: y.i
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Colour.i: FillColour.i
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EndStructure
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Macro RandInt(MAXLIMIT)
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Int(MAXLIMIT*(Random(#MAXLONG)/#MAXLONG))
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EndMacro
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Macro SQ2(X, Y)
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((X)*(X) + (Y)*(Y))
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EndMacro
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Procedure GenRandomPoints(Array a.VCoo(1), xMax, yMax, cnt)
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Protected i, j, k, l
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cnt-1
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Dim a(cnt)
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For i=0 To cnt
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a(i)\x = RandInt(xMax): a(i)\y = RandInt(yMax)
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j = RandInt(255): k = RandInt(255): l = RandInt(255)
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a(i)\Colour = RGBA(j, k, l, 255)
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a(i)\FillColour = RGBA(255-j, 255-k, 255-l, 255)
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Next i
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ProcedureReturn #True
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EndProcedure
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Procedure MakeVoronoiDiagram(Array a.VCoo(1),xMax, yMax) ; Euclidean
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Protected i, x, y, img, dist.d, dt.d
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img = CreateImage(#PB_Any, xMax+1, yMax+1)
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If StartDrawing(ImageOutput(img))
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For y=0 To yMax
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For x=0 To xMax
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dist = Infinity()
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For i=0 To ArraySize(a())
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dt = SQ2(x-a(i)\x, y-a(i)\y)
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If dt > dist
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Continue
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ElseIf dt < dist
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dist = dt
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Plot(x,y,a(i)\FillColour)
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Else ; 'Owner ship' is unclear, set pixel to transparent.
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Plot(x,y,RGBA(0, 0, 0, 0))
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EndIf
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Next
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Next
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Next
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For i=0 To ArraySize(a())
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Circle(a(i)\x, a(i)\y, 1, a(i)\Colour)
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Next
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StopDrawing()
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EndIf
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ProcedureReturn img
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EndProcedure
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; Main code
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Define img, x, y, file$
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Dim V.VCoo(0)
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x = 640: y = 480
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If Not GenRandomPoints(V(), x, y, 150): End: EndIf
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img = MakeVoronoiDiagram(V(), x, y)
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If img And OpenWindow(0, 0, 0, x, y, "Voronoi Diagram in PureBasic", #PB_Window_SystemMenu)
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ImageGadget(0, 0, 0, x, y, ImageID(img))
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Repeat: Until WaitWindowEvent() = #PB_Event_CloseWindow
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EndIf
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UsePNGImageEncoder()
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file$ = SaveFileRequester("Save Image?", "Voronoi_Diagram_in_PureBasic.png", "PNG|*.png", 0)
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If file$ <> ""
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SaveImage(img, file$, #PB_ImagePlugin_PNG)
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EndIf
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