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Thread: TB Mandelbrot Time

  1. #1
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    TB Mandelbrot Time

    Hi,

    Not that fast!
    DWord hdc,hwin
    hwin=Canvas_Window("Mandel",10,10,640,480)
    Canvas_Attach(hwin,0,%TRUE) 
    Canvas_Font("verdana",16,%CANVAS_FONTSTYLE_BOLD)
    
    
    Single lx, ly, x, y, a2, b2, a, b, z, c, x2, y2
    Long tick, tack, t
    
    
    Canvas_Clear 0
    DrawText 260,40,"MOMENT....",Rgb 255,255,255
    Canvas_Redraw
    
    
    tick = GetTickCount
    lx=3/640
    ly=2/480
    
    
    For x=0 To 640-1 
       For y=0 To 480-1 
           a=0: b=0: c=0
           x2 = lx*x-2
           y2 = ly*y-1
           While c <50
    	       a2 = a*a-b*b
             b2 = 2*a*b
    	       a = a2+x2
    	       b = b2+y2
    	       z = a*a+b*b
    	       If z >=4 Then Exit While 
    	       c=c+1
           Wend	
           If c = 50 Then
              Canvas_SetPixel x,y, 0
           ElseIf c <17 Then
     	        Canvas_SetPixel x,y, Rgb(0,245-((17-c)*3),0)
           ElseIf c <33 Then
              Canvas_SetPixel x,y, Rgb(0,245,((c-16)*16)-16)
           Else
    	        Canvas_SetPixel x,y, Rgb(0,641-(c*12),((c-32)*15))
           End If
       Next
    Next
    
    
    tack = GetTickCount
    t = (tack-tick)/1000
    
    
    DrawText 0, 0,"Press Escape To Exit   ",Rgb(0,0,255)
    DrawText 0,20,"Time: " & Str$(t) & " seconds",Rgb(0,0,255)
    
    
    Canvas_Redraw
    Canvas_WaitKey
    Canvas_Window End hwin
    
    
    Sub DrawText(x,y As Long, txt As String, col As Long) 
        Canvas_Color(col,-2)
        Canvas_SetPos(x,y)
        Canvas_Print(txt)
    End Sub
    

  2. #2
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    Here is an OxygenBasic version.
    Attached Files Attached Files

  3. #3
    Here's another one, yet slower but plotting in real time:

    Uses "UI"
    
    Declare Sub GetClientRect Lib "USER32.DLL" Alias "GetClientRect" (ByVal hWnd As DWord, ByVal lpRect As RECT Ptr)
    Declare Function GetDC Lib "USER32.DLL" Alias "GetDC" (ByVal hWnd As DWord) As Long
    Declare Sub ReleaseDC Lib "USER32.DLL" Alias "ReleaseDC" (ByVal hWnd As DWord, ByVal hDC As DWord)
    Declare Sub SetPixel Lib "GDI32.DLL" Alias "SetPixel" (ByVal hDC As DWord, ByVal X As Long, ByVal Y As Long, ByVal crColor As Long)
    
    Dim rc As RECT
    Dim MaxIters As Long = 50
    Dim XRes, YRes As Long
    
    Dim colors(MaxIters + 2) As Long
    Dim hDC, hDlg As DWord
    Dim t As Long
    
    Dialog New 0, "Mandelbrot",-1,-1, 426, 295, _
                  %WS_POPUP Or %WS_VISIBLE Or %WS_CAPTION Or %WS_SYSMENU Or %WS_MINIMIZEBOX Or %WS_MAXIMIZEBOX To hDlg
    
    Dialog Show Modeless hDlg
    
    FillColorTable
    GetClientRect hDlg, rc
    
    XRes = rc.nRight
    YRes = rc.nBottom
    
    hDC = GetDC(hDlg)
    t = GetTickCount
    
    GenMandelbrot -2.1, -1.25, 0.6, 1.25
    
    MsgBox hDlg, Format$(GetTickCount - t) & " ticks"
    ReleaseDC hDlg, hDC
    
    Sub GenMandelbrot(xMn As Double, yMn As Double, xMx As Double, yMx As Double)
        Dim iX, iY As Long
        Dim cx, cy, dx, dy As Double
    
        dx = (xMx - xMn) / XRes
        dy = (yMx - yMn) / YRes
        
        For iY = 0 To YRes
            cy = yMn + iY * dy
            For iX = 0 To XRes
                cx = xMn + iX * dx
                SetPixel hDC, iX, iY, colors(MIterate(cx, cy) + 1)
            Next
        Next
    End Sub
    
    Function MIterate(cx As Double, cy As Double) As Long
        Dim iters As Long 
        Dim X As Double = cx
        Dim Y As Double = cy
        Dim X2 As Double = X * X
        Dim Y2 As Double = Y * Y
        Dim temp As Double
        
        While (iters <= MaxIters) And (X2 + Y2 < 4)
            temp = cx + X2 - Y2
            Y = cy + 2 * X * Y
            Y2 = Y * Y
            X = temp
            X2 = X * X
            iters += 1
        Wend
        
        Return iters
    End Function
    
    Sub FillColorTable()
        Dim r, g, b As Long
        Dim rd, gd, bd As Long
        Dim rr, gg, bb As Long
        Dim i, j, wid As Long
        
        Dim clr(4) As Long
        clr(2) = Rgb(0, 255, 0)
        clr(3) = Rgb(255, 255, 0)
        clr(4) = Rgb(255, 0, 0)
        
        wid = MaxIters / 3
        
        For j = 0 To 2
            toRGB(clr(j + 1), r, g, b)
            toRGB(clr(j + 2), rr, gg, bb)
            rd = (rr - r) / (wid + 1)
            gd = (gg - g) / (wid + 1)
            bd = (bb - b) / (wid + 1)
            For i = 0 To wid
                colors(j * wid + i + 1) = Rgb(r, g, b)
                r += rd
                g += gd
                b += bd
            Next
        Next
        colors(MaxIters + 2) = 0
    End Sub
    
    Sub toRGB(c As Long, ByRef r As Long, ByRef g As Long, ByRef b As Long)
        r = c And &HFF
        g = (c And &HFF00) / &H100
        b = (c And &HFF0000) / &H10000
    End Sub
    
    Mike
    (3.6GHz i5 Core Quad w/ 16GB RAM, 2 x GTX 650Ti SLI-bridged w/ 2GB VRAM, x64 Windows 7 Ultimate Sp1)

  4. #4
    Great stuff !!


    attached - "greased lightning speed" Dynamic O2 -- bmp transfer , real time adjusting .. (Julia however, easy to convert into Mandelbrot)


    best

    Rob
    Attached Files Attached Files

  5. #5
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    Thank you Mike, RobbeK

    Mike,
    I like your Mandelbrot, looks good for me.

    RobbeK,
    Your animated Mandelbrot looks great as well.

  6. #6
    Wow Rob,


    Your interactive TV is amazing!

    Can I have your permission to port it to FBSL and publish with due attribution of course? It's a pity we don't have a built-in Canvas for persistent drawing though. We have to use low-level API's for a memory backbuffer plus BitBlt (slower) or work directly with the bmp's DIB section pixel data array (faster). But the effect and speed will be as smooth and fast as your original.


    Regards,
    Mike
    (3.6GHz i5 Core Quad w/ 16GB RAM, 2 x GTX 650Ti SLI-bridged w/ 2GB VRAM, x64 Windows 7 Ultimate Sp1)

  7. #7
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    Hi,

    here's Mike's Mandelbrot, translate to OxygenBasic.
    Attached Files Attached Files
    Last edited by peter; 08-12-2013 at 17:50.

  8. #8
    Peter,

    Thanks for the Mandelbrot O2 example. I'm only able to post the resulting time dialog as I'm not quick enough to capture the graphic generated. (don't blink) Can you post another version of this that retains the generated fractal? I'm running under Wine so the Windows version of this should even be faster.

    Last edited by John Spikowski; 08-12-2013 at 22:13.
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  9. #9
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    Okay, here is the source code.
    Attached Files Attached Files

  10. #10

    Post

    Hi Mike,

    Sure -- but the timer events were coded by Eros , and the Canvas_Bitmap byRef was new for TB 1.9.10 then.
    Attached , IIRC my first BMP linking thing < 1.9.10 (I made something similar in Freebasic and Freepascal to gain some speed )

    best, Rob
    (those glitter pixels were added later IIRC )

    OOps , always forget to ask -- your DynC does it lazy evaluation ??? -- I really need this for some mathematical related progs ..
    Attached Files Attached Files
    Last edited by RobbeK; 09-12-2013 at 11:26.

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