rotate around button

[Magic Gooddy]

Hi!
How to rotate one button around another like Sun and Planet?
Sample, please!

 

[Ricky W. Hunt]

Hi!
How to rotate one button around another like Sun and Planet?
Sample, please!

I suppose manipulating the location with a loop would do it. Just be sure to
watch the "bring to front" property.

 

[Jeff Johnson [MVP: VB]]

How to rotate one button around another like Sun and Planet?
Sample, please!

I don't have a sample, but I can suggest a direction. You just need to use a
little trigonometry to calculate the x and y coordinates that the revolving
button will need as you go from 0 to 360 degrees. Cosine will give you the x
and Sine will give you the y.

 

[Jason L James]

VB uses Radians, not degrees for all of its trig. Remeber
to convert from one to the other to make sure everthing
works out fine.

2PI radians = 360 degrees.

1Pi radians = 180 degrees.

The code below draws a second hand on a clock face
using trig and radians.

Private Sub DrawSeconds()

Dim x As Double
Dim y As Double
Dim x1, y1 As Double
Dim myPen As New Pen(Color.Black, 1)

Dim rads As Double = ((Second * 6) - 180) * (PI / 180)

x = Centre.X - (((FaceWidth / 2) - 10) * Sin(rads))
x1 = Centre.X - (10 * Sin(rads))
y = Centre.Y + (((FaceWidth / 2) - 10) * Cos(rads))
y1 = Centre.Y + (10 * Cos(rads))
g.DrawLine(myPen, CInt(x1), CInt(y1), CInt(x), CInt(y))

End Sub


Good luck.

 

[Cablewizard]

Magic,

As Jason points out, everything is done in Radians. This isn't just a VB thing,
every app that uses trigonometry nowadays really uses Radians internally.

Now I hate to ask, but why do you want Buttons to do this? Would someone be
trying to click the thing?
What will be your trigger? Will it just revolve at a particular interval, say
using a timer? Or will it move based another event of some sort?
Do you need to deal with the fact that mathematically you will get a point, but
since the button has width and height, it won't appear to make a circle unless
you account for this and use the calculated center point of the button.

Gerald