AE SceneControl 滚轮实现缩放功能

        private void axSceneControl_OnMouseWheel(object sender, MouseEventArgs e)
        {
            try
            {
                System.Drawing.Point pSceLoc = axSceneControl1.PointToScreen(this.axSceneControl1.Location);
                System.Drawing.Point Pt = this.PointToScreen(e.Location);
                if (Pt.X < pSceLoc.X || Pt.X > pSceLoc.X + axSceneControl1.Width || Pt.Y < pSceLoc.Y || Pt.Y > pSceLoc.Y + axSceneControl1.Height)
                {
                    return;
                }
                double scale = 0.2;
                if (e.Delta < 0) scale = -0.2;
                ICamera pCamera = axSceneControl1.Camera;
                IPoint pPtObs = pCamera.Observer;
                IPoint pPtTar = pCamera.Target;
                pPtObs.X += (pPtObs.X - pPtTar.X) * scale;
                pPtObs.Y += (pPtObs.Y - pPtTar.Y) * scale;
                pPtObs.Z += (pPtObs.Z - pPtTar.Z) * scale;
                pCamera.Observer = pPtObs;
                axSceneControl1.SceneGraph.RefreshViewers();
            }
            catch
            {
            } 
        }

//添加滚轮事件

     this.MouseWheel += new System.Windows.Forms.MouseEventHandler(axSceneControl_OnMouseWheel);