Base: move Files

Base/GraphicsEx.vb

@@ -0,0 +1,43 @@
+Imports System.Drawing
+
+Public Class GraphicsEx
+
+    ''' <summary>
+    ''' Returns the brightness of a color as a number between 0 and 1
+    ''' </summary>
+    ''' <param name="pColor">The color to check</param>
+    ''' <returns>Low values for dark colors, high values for bright colors.</returns>
+    Public Shared Function GetBrightness(pColor As Color) As Single
+        Return (pColor.R * 0.299F + pColor.G * 0.587F + pColor.B * 0.114F) / 256.0F
+    End Function
+
+    ''' <summary>
+    ''' Returns a foreground/text color of either black or white, depending on the brightness of `pOtherColor`
+    ''' </summary>
+    ''' <param name="pOtherColor">The Background color whose brightness is determined</param>
+    ''' <returns>A text color which is either white or black</returns>
+    Public Shared Function GetContrastedColor(pOtherColor As Color) As Color
+        If GetBrightness(pOtherColor) < 0.55 Then
+            Return Color.White
+        Else
+            Return Color.Black
+        End If
+    End Function
+
+    Public Sub DrawRectangle(Bounds As Rectangle)
+        Dim oContext As IntPtr
+        oContext = NativeMethods.GetDC(IntPtr.Zero)
+
+        Try
+            Dim g As Graphics
+            g = Graphics.FromHdc(oContext)
+            Try
+                g.DrawRectangle(Pens.Red, Bounds)
+            Finally
+                g.Dispose()
+            End Try
+        Finally
+            NativeMethods.ReleaseDC(IntPtr.Zero, oContext)
+        End Try
+    End Sub
+End Class