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Thread: Sine curve (RESOLVED)

  1. Aug 9th, 2005, 10:36 AM #1
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    Resolved Sine curve (RESOLVED)

    Hi,

    I don't suppose any one has a programme that could draw me a sine curve from 0 degrees to 90 degrees starting at 3cm from the fulcrum please??? It is just a one off item I need and although I can work out the figures, I am having great difficulty in marking out the template. I need to make a cam of that shape.
    Last edited by taxes; Aug 17th, 2005 at 05:59 AM. Reason: resolved
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  2. Aug 16th, 2005, 06:36 AM #2
    krtxmrtz
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    Re: Sine curve

    What exactly is the fulcrum of a sine curve?
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  3. Aug 16th, 2005, 07:34 PM #3
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    Re: Sine curve

    Hi,

    I have probably used the wrong terms.

    I can make the calculations arithmetically, so I will probably have to construct a graph based on those calculations.

    The X axis will be the size of the angle and the Y axis will plot the sine of that angle multiplied by 30 mm

    I had hoped that someone in a mathematics discipline had a programme which would do that.

    Thanks for your response & my apologies for my confusion.
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  4. Aug 17th, 2005, 03:16 AM #4
    krtxmrtz
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    Re: Sine curve

    This should get you started:
    VB Code:
    1. 'Place a picturebox called p1 on a form

    2. Option Explicit

    3. Const Pi = 3.141593

    4. Const nP = 2    'Number of periods to be plotted

    5. Private Sub Form_Click()

    6.     PlotSine

    7. End Sub

    8. Private Sub PlotSine()

    9.     Dim x As Single, angle As Single, dx As Single

    10.  
    11.     p1.Scale (-nP * Pi, 1)-(nP * Pi, -1)

    12.     dx = 2 * nP * Pi / 500

    13.     p1.CurrentX = -nP * Pi

    14.     p1.CurrentY = 0

    15.     For x = -nP * 180 To nP * 180 Step dx

    16.         angle = x * Pi / 180

    17.         p1.Line -(x, Sin(x))

    18.     Next

    19. End Sub
    Last edited by krtxmrtz; Aug 17th, 2005 at 05:32 AM.
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  6. Aug 17th, 2005, 05:29 AM #5
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    Re: Sine curve

    Hi,

    Many thanks.

    I'm trying it shortly.
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  7. Aug 17th, 2005, 05:38 AM #6
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    Re: Sine curve

    I'm assuming that you need the 30mm to be exact when printed? If you want this then you'll need to use PCL, and possible, a fixed coordinate system (one that maps, by a known and fixed ratio, pixels to DPI)
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  8. Aug 17th, 2005, 05:45 AM #7
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    Re: Sine curve

    Hi krtxmrtx,

    That's it!!!!! Many thanks (For anyone else looking, the code is VB6)
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