Revit.SDK.Samples.NewHostedSweep.CS.EdgeFetchForm.pictureBoxPreview_MouseMove C# (CSharp) Method

        private void pictureBoxPreview_MouseMove(object sender, MouseEventArgs e)
        {
            if (m_activeElem == null) return;

            m_trackBall.OnMouseMove(e);
            if (e.Button == MouseButtons.Left)
            {
                m_creationData.Creator.ElemGeomDic[m_activeElem].Rotation *= m_trackBall.Rotation;
                pictureBoxPreview.Refresh();
            }
            else if (e.Button == MouseButtons.Right)
            {
                m_creationData.Creator.ElemGeomDic[m_activeElem].Scale *= m_trackBall.Scale;
                pictureBoxPreview.Refresh();
            }

            if (e.Button == MouseButtons.None)
            {
                ClearAllHighLight();
                pictureBoxPreview.Refresh();
                Matrix mat = (Matrix)m_centerMatrix.Clone();
                mat.Invert();
                PointF[] pts = new PointF[1] { e.Location };
                mat.TransformPoints(pts);
                ElementGeometry elemGeom = m_creationData.Creator.ElemGeomDic[m_activeElem];
                foreach (Edge edge in m_creationData.Creator.SupportEdges[m_activeElem])
                {
                    if (elemGeom.EdgeBindingDic.ContainsKey(edge))
                    {
                        if (elemGeom.EdgeBindingDic[edge].HighLight(pts[0].X, pts[0].Y))
                        {
                            pictureBoxPreview.Refresh();
                        }
                    }
                }
            }
        }