Change rectangle measures

Wardrobe/GUI.vb

@@ -6,6 +6,7 @@ Public Class GUI
     Dim GratingW, GratingH As Double
     Dim DrawW, DrawH As Integer
     Dim Aspect1, Aspect2 As Double
+    Dim p1X, p1Y, p2X, p2Y, p3X, p3Y, p4X, p4Y As Integer
 
 
 
@@ -14,6 +15,18 @@ Public Class GUI
 
         AddHandler DrawBox.Paint, AddressOf DrawingPanel_Paint
         get_drawboxParameters()
+        set_startPoints()
+    End Sub
+
+    Private Sub set_startPoints()
+        p1X = boxMidX - CInt(DrawW / 2)
+        p1Y = boxMidY - CInt(DrawH / 2)
+        p2X = boxMidX + CInt(DrawW / 2)
+        p2Y = boxMidY - CInt(DrawH / 2)
+        p3X = boxMidX + CInt(DrawW / 2)
+        p3Y = boxMidY + CInt(DrawH / 2)
+        p4X = boxMidX - CInt(DrawW / 2)
+        p4Y = boxMidY + CInt(DrawH / 2)
     End Sub
 
     Private Sub get_drawboxParameters()
@@ -35,18 +48,7 @@ Public Class GUI
 
     End Sub
 
-
     Private Sub DrawingPanel_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs)
-        Dim p1X As Integer = boxMidX - CInt(DrawW / 2)
-        Dim p1Y As Integer = boxMidY - CInt(DrawH / 2)
-        Dim p2X As Integer = boxMidX + CInt(DrawW / 2)
-        Dim p2Y As Integer = boxMidY - CInt(DrawH / 2)
-        Dim p3X As Integer = boxMidX + CInt(DrawW / 2)
-        Dim p3Y As Integer = boxMidY + CInt(DrawH / 2)
-        Dim p4X As Integer = boxMidX - CInt(DrawW / 2)
-        Dim p4Y As Integer = boxMidY + CInt(DrawH / 2)
-
-
         Dim pen As Pen = New Pen(Color.Red, 2)
         e.Graphics.DrawLine(pen, p1X, p1Y, p2X, p2Y)
         e.Graphics.DrawLine(pen, p2X, p2Y, p3X, p3Y)
@@ -60,9 +62,26 @@ Public Class GUI
         Aspect2 = GratingW / GratingH
         If Aspect2 > Aspect1 Then
             'Change draw height
+            Dim wDiff As Double
+            wDiff = GratingW / DrawW
+
+            p1Y = boxMidY - CInt(GratingH / (wDiff * 2))
+            p2Y = boxMidY - CInt(GratingH / (wDiff * 2))
+            p3Y = boxMidY + CInt(GratingH / (wDiff * 2))
+            p4Y = boxMidY + CInt(GratingH / (wDiff * 2))
         Else
+            'Change draw width
+            Dim hDiff As Double
+            hDiff = GratingH / DrawH
+
+            p1X = boxMidX - CInt(GratingW / (hDiff * 2))
+            p2X = boxMidX + CInt(GratingW / (hDiff * 2))
+            p3X = boxMidX + CInt(GratingW / (hDiff * 2))
+            p4X = boxMidX - CInt(GratingW / (hDiff * 2))
         End If
 
+        'Redraw rectangle
+        Me.Refresh()
     End Sub
 
 End Class