CODEWITHSUNDEEP
vb.netimagedynamic
EvanBlack
EvanBlack

Reputation: 759

Creating listview icons on the fly on VB.NET?

Is that possible? I want to pass my custom color as a parameter and I want to receive an Image (rectangle for example).

Public Function createIcon(ByVal c As Color) As Bitmap
    Dim g As Graphics
    Dim Brush As New SolidBrush(c)
    g.FillRectangle(Brush, New Rectangle(0, 0, 20, 20))
    Dim bmp As New Bitmap(20, 20, g)
    Return bmp
End Function

I tried this way and couldn't success.

Upvotes: 2

Views: 773

Answers (2)

Konrad Rudolph
Konrad Rudolph

Reputation: 545865

  • Bitmap: A canvas (in memory) that contains an image.
  • Graphics: A tool set that allows you to draw on an associated canvas.

With this in mind, here is the solution:

Public Function CreateIcon(ByVal c As Color, ByVal x As Integer, ByVal y As Integer) As Bitmap
    Dim icon As New Bitmap(x, y)

    Using g = Graphics.FromImage(icon)
        Using b As New SolidBrush(c)
            g.FillRectangle(b, New Rectangle(0, 0, 20, 20))
        End Using
    End Using

    Return icon
End Function

The Using blocks here merely serve the purpose of disposing the graphics resources properly (by automatically calling their Dispose method at the end of the block). You need to do this, otherwise you will leak graphics resources.

Upvotes: 1

EvanBlack
EvanBlack

Reputation: 759

Okay, got it. I am going to share what I did just in case.

Public Function createIcon(ByVal c As Color, ByVal x As Integer, ByVal y As Integer) As Bitmap
    createIcon = New Bitmap(x, y)
    For i = 0 To x - 1
        For j = 0 To y - 1
            If i = 0 Or j = 0 Or i = x - 1 Or j = y - 1 Then
                createIcon.SetPixel(i, j, Color.Black)
            Else
                createIcon.SetPixel(i, j, c)
            End If
        Next
    Next
    Return createIcon
End Function

This function will give you a colored rectangle with black border.

Upvotes: 0

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