Rounded rectangles?

[MrPolite]

is there an easy way to draw a rounded rectangle? right now I'm making a graphicsPath and I'm making one by drawing 4 arcs and 4 lines and connecting them together. It's kinda messy

[Zcumbag]

I like to take this thread up again... since I need to draw rounded rectangles as well...

you guys might have a few more months of exprience of vb.net now

if there is no good solution I would really appreciate some code-snippets of the arc-solution written about above.

Thanks in advance

David N.
Sweden

[MrPolite]

well I made a crappy function. Doesnt work perfectly, and it may not make a lot of sense

Private Function GetRoundedRect(ByVal rect As Rectangle, ByVal roundness As Integer) As GraphicsPath
        If roundness < 1 Then
            Throw New ArgumentOutOfRangeException("Roundness has to be greater than or equal to one.")
        End If
 
        Dim MAX_ROUNDNESS As Integer = NumberManipulation.LeastValue(rect.Width \ 2, rect.Height \ 2)
        If roundness > MAX_ROUNDNESS Then roundness = MAX_ROUNDNESS
 
 
        Dim p As New GraphicsPath()
        Dim roundRect As New Rectangle(rect.X, rect.Y, 2 * roundness, 2 * roundness)
 
        p.AddArc(roundRect, 180, 90)
 
        roundRect.X = rect.Right - roundRect.Width
        p.AddArc(roundRect, -90, 90)
 
        roundRect.Y = rect.Bottom - roundRect.Height
        p.AddArc(roundRect, 0, 90)
 
        roundRect.X = rect.X
        p.AddArc(roundRect, 90, 90)
 
        p.CloseFigure()
        Return p
    End Function

just pass the rectangle that you want to draw, and give it a value for "roundness".... it returns a path. I didnt write any comments, sorry

[Zcumbag]

all-right... I modified a little and it works almost great
when I use the FillPath() method (system.drawing.graphics), it fills the path but it also draws some wierd lines...

watch the pic

Function DrawRoundRectangle(ByVal X1 As Integer, ByVal Y1 As Integer, ByVal Length As Single, ByVal Height As Single, ByVal RoundRadius As Integer, ByVal LineCol As String, ByVal FillCol As String, ByVal gr As System.Drawing.Graphics) As System.Drawing.Graphics

        Dim LineColor As System.Drawing.Color = GetColor(LineCol)
        Dim FillColor As System.Drawing.Color = GetColor(FillCol)

        Dim Pen As New System.Drawing.Pen(LineColor)
        Dim Brush As New System.Drawing.SolidBrush(FillColor)

        Dim myPath As System.Drawing.Drawing2D.GraphicsPath = New System.Drawing.Drawing2D.GraphicsPath()

        myPath.StartFigure()

        myPath.AddArc(X1, Y1, RoundRadius * 2, RoundRadius * 2, 180, 90)
        myPath.AddArc(X1 + Length - RoundRadius * 2, Y1, RoundRadius * 2, RoundRadius * 2, 270, 90)
        myPath.AddArc(X1 + Length - RoundRadius * 2, Y1 + Height - RoundRadius * 2, RoundRadius * 2, RoundRadius * 2, 0, 90)
        myPath.AddArc(X1, Y1 + Height - RoundRadius * 2, RoundRadius * 2, RoundRadius * 2, 90, 90)
        myPath.CloseFigure()

        gr.FillPath(Brush, myPath)
        gr.DrawPath(Pen, myPath)

        Return gr

    End Function

[MrPolite]

to tell you the truth I'm tired of the graphics class of .NET, it can be due to my own dumb-ass-ness, but anyways I'm tired of it I get billions of weird errors

I dont remember having that kind of error when I used the function, sorry if I cant help

[nemaroller]

Zcumbag's functions works rather well....
the only thing missing is to check whether the value for Roundness is greater than the (Length or Width /2)... because once roundness is > than those, it is beyond the abilities of the function (since you are basically asking for an ellipse at that point).

So pat yourself on the back, because its perfect.... the 'errors' you asked about were actually side effects of supplying bad parameters to the function. AS long as Roundness is not greater than HALF the length or width, it works wonderfully.

Btw, I changed the passed colors to be Colors instead of strings...

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim mygraphics As Graphics
        mygraphics = Graphics.FromHwnd(ActiveForm.Handle)
 
        DrawRoundRectangle(140, 120, 29, 30, 15, Color.Blue, Color.White, mygraphics)
    End Sub
    Function DrawRoundRectangle(ByVal X1 As Integer, ByVal Y1 As Integer, ByVal Length As Single, ByVal Height As Single, _
  ByVal RoundRadius As Integer, ByVal LineColor As Color, ByVal FillColor As Color, ByVal gr As System.Drawing.Graphics) As System.Drawing.Graphics
 
 
        Dim Pen As New System.Drawing.Pen(LineColor)
        Dim Brush As New System.Drawing.SolidBrush(FillColor)
 
        Dim myPath As System.Drawing.Drawing2D.GraphicsPath = New System.Drawing.Drawing2D.GraphicsPath()
        [b]If RoundRadius > Length / 2 OrElse RoundRadius > Height / 2 Then RoundRadius=Height / 2[/b]
 
        myPath.StartFigure()
 
        myPath.AddArc(X1, Y1, RoundRadius * 2, RoundRadius * 2, 180, 90)
        myPath.AddArc(X1 + Length - RoundRadius * 2, Y1, RoundRadius * 2, RoundRadius * 2, 270, 90)
        myPath.AddArc(X1 + Length - RoundRadius * 2, Y1 + Height - RoundRadius * 2, RoundRadius * 2, RoundRadius * 2, 0, 90)
        myPath.AddArc(X1, Y1 + Height - RoundRadius * 2, RoundRadius * 2, RoundRadius * 2, 90, 90)
        myPath.CloseFigure()
 
        gr.FillPath(Brush, myPath)
        gr.DrawPath(Pen, myPath)
 
        Return gr
 
    End Function

[nemaroller]

Btw, this has proved very helpful in making my RoundButton class.... thanks again.... I now have beautiful rounded-edge gradient- filled buttons...

[nemaroller]

Here, I attached a picture of the buttons... which use the roundrectangle function provided above... notice the bottom picture uses a circular gradient instead of a forwarddiagonal gradient.

[MrPolite]

Originally posted by nemaroller
Btw, this has proved very helpful in making my RoundButton class.... thanks again.... I now have beautiful rounded-edge gradient- filled buttons...

w00t, looks nice

the only thing missing is to check whether the value for Roundness is greater than the (Length or Width /2)... because once roundness is > than those, it is beyond the abilities of the function (since you are basically asking for an ellipse at that point).

mine had that

edit: btw if you notice I said in the first post that it is kinda "crappy". Well it doesnt make a perfect rectangle. Usually it's not obvious, but with certain values of roundness it gets more obvious... the bottom right corner is usually less round than the other corners

[nemaroller]

I haven't noticed a slightly less round corner, but I have been using

graphics.SmoothingMode = SmoothingMode.AntiAlias

in my button class, so it always seems to turn out perfect... but it may have to do with the multiplication and a rounding error.... i'll look into that...