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Claur
Posts: **1**Member

I am looking for a way to use the trigonometric functions sin, cosine and tangent, as well as someway of inpuing the value of Pi into a VB program? Any ideas how I can do this, or is it fairly impossible?

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## Comments

75Member:

Quite easily actually, though I'm sure that Pi isn't actually a recognized constant in VB. Just Dim it in at the start of the code:

Dim Pi As Long

Pi = 3.1415972 'To whatever degree of accuracy you know of

The sin, cos and tan functions can be used in VB, simply by saying:

1 = Sin(90)

y = Sin(x) 'To use variables

I used the cartesian equations to make a circle in a form.

Make the X and Y position of an image as MyX and MyY for example,

Use the known equation:

Sin(t)^2 + Cos(t)^2 = 1

From this substitute X = Sin(t) and Y = Cos(t)

X^2 + Y^2 = 1 This is a cartesian equation of a circle.

t is a third variable, which is the counter for the loop.

When t is 0, the image is at the start point. Set the limit for t to be high for a long loop or low for a speedy loop. The image will spin around a centre point in the shape of a circle.

X^2 + Y^2 = 1

X^2 + Y^2 = R^2

General cartesian equations are like this. To make an equation where the Radius is 3 and the centre point is co-ordinate (5,8):

(X-5)^2 + (Y-8)^2 = 3^2 = 9

If you don't have a clue what I mean, check it out yourself. You'll need a userform with 3 OptionButtons called Ball, Ball2 and Ball3.

Enjoy! Have a play with the code.

Copy this code into the declarations of a userform code:

Private Sub UserForm_Activate()

Looper = 0

Finish = False

Speed = 100 'Higher value here is actually slower

Radius = 3 'Recommend < 15

Squash = 2 '2 is Normal circle

Looper2 = 0

Speed2 = 200 'Higher value here is actually slower

Radius2 = 6 'Recommend < 15

Squash2 = 2 '2 is Normal circle

Looper3 = 0

Speed3 = 300 'Higher value here is actually slower

Radius3 = 9 'Recommend < 15

Squash3 = 2 '2 is Normal circle

Blink = True

Pi = 3.1415972

Do

DoEvents

'MAIN LOOP

If Looper > Speed * Pi Then

Looper = 0

Else

Looper = Looper + 1

End If

Ball.Left = Cos(Looper / (Speed / 2) - 1) * Radius ^ 2 + 216

Ball.Top = Sin(Looper / (Speed / 2) - 1) * Radius ^ Squash + 159

'MAIN LOOP

If Looper2 > Speed2 * Pi Then

Looper2 = 0

Else

Looper2 = Looper2 + 1

End If

Ball2.Left = Cos(Looper2 / (Speed2 / 2) - 1) * Radius2 ^ 2 + 216

Ball2.Top = Sin(Looper2 / (Speed2 / 2) - 1) * Radius2 ^ Squash2 + 159

'MAIN LOOP

If Looper3 > Speed3 * Pi Then

Looper3 = 0

Else

Looper3 = Looper3 + 1

End If

Ball3.Left = Cos(Looper3 / (Speed3 / 2) - 1) * Radius3 ^ 2 + 216

Ball3.Top = Sin(Looper3 / (Speed3 / 2) - 1) * Radius3 ^ Squash3 + 159

If Finish Then: Exit Do

Loop

End Sub

Private Sub UserForm_QueryClose(Cancel As Integer, CloseMode As Integer)

Finish = True

End Sub

748Member:

p=Math.Pi

a=Math.Sin(42)

and so on....

Regards,

Dr M.