GraphicsWindow.Width = 500
GraphicsWindow.Height = 500

GraphicsWindow.PenWidth = 10
For i = 0 To 500 Step 100
For z = 0 To 500 Step 100
GraphicsWindow.PenColor = "Green"
GraphicsWindow.DrawLine(10+i, 10+z, 100+i, 100+z)
GraphicsWindow.PenColor = "Gold"
GraphicsWindow.DrawLine(10+i, 100+z, 100+i, 10+z)
GraphicsWindow.PenColor = "Red"
GraphicsWindow.DrawLine(50+i, 0+z, 50+i, 100+z)
EndFor
EndFor