StonehearthEditor.EncounterDesignerView.graphViewer_MouseMove C# (CSharp) Method

        private void graphViewer_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Middle)
            {
                double differenceX = e.X - mPreviousMouseX;
                double differenceY = e.Y - mPreviousMouseY;

                differenceX = Math.Min(Math.Max(differenceX, -kMaxDrag), kMaxDrag);
                differenceY = Math.Min(Math.Max(differenceY, -kMaxDrag), kMaxDrag);

                mPreviousMouseX = e.X;
                mPreviousMouseY = e.Y;
                graphViewer.Pan(differenceX, differenceY);
            }
        }