round circle

how we create a small circle at the edge on another circle and move this small circle on it like a clock

>we create a small circle

To create a circle U can use function circle.

Circle [Step](x, y), radius[, color]

This function creates a circle on a form, with API FillRgn [Public Declare Function FillRgn Lib "gdi32" Alias "FillRgn" (ByVal hdc As Long, ByVal hRgn As Long, ByVal hBrush As Long) As Long ] also U can fill it.


hi, brt

You can also use the SHAPE control. It provides a variaty of shapes, Rectangles,Squares,Circles Ovals etc. it provides for line types,width, Fill Patterns, etc

John G

Use the shape control to make a circle on the form and set its index property to 0. Make sure that the width and height are the same so it is a circle and not an oval. Then add a timer and a command button and paste this code to the form.

private Sub Command1_Click()
If Shape1.Count = 1 then Load Shape1(1)

Shape1(1).Left = Shape1(0).Left + Shape1(0).Width
Shape1(1).Top = Shape1(0).Top + (0.5 * Shape1(0).Height) - (0.125 * Shape1(0).Height)
Shape1(1).Height = (0.25 * Shape1(0).Height)
Shape1(1).Width = (0.25 * Shape1(0).Width)
Shape1(1).Visible = true

Timer1.Interval = 250
Timer1.Enabled = true
End Sub

private Sub Timer1_Timer()
Dim nRadius as Integer, nX as Integer, nY as Integer
Const pi = 3.14159265358979

static nAngle as Integer

nRadius = 0.5 * (Shape1(0).Width + Shape1(1).Width)

nAngle = nAngle + 10
If nAngle > 360 then
nAngle = 0
Timer1.Enabled = false
Exit Sub
End If

nX = Cos(CDbl(nAngle) * pi / 180) * nRadius
nY = Sin(CDbl(nAngle) * pi / 180) * nRadius

Shape1(1).Left = Shape1(0).Left + 0.5 * Shape1(0).Width + nX - 0.5 * (Shape1(1).Width)
Shape1(1).Top = Shape1(0).Top + 0.5 * Shape1(0).Height - nY - 0.5 * (Shape1(1).Height)
End Sub



This will draw a circle 1/4 the size of the initial circle and place it on the right edge of the large circle. It will then rotate the smaller circle around the larger circle in revolutions of 10 degrees every .25 seconds until it has made 1 full revolution.

-K