arcgis漫游

来源：互联网发布：电视节目直播软件编辑：程序博客网时间：2024/04/27 16:17

漫游的过程中需要监控鼠标在整个过程中的变化，如鼠标点击，移动等等，因此漫游的实现也需要在地图显示空间的MouseDown、MouseMove、MouseUp事件中实现，在例程中使用的PictureBox空间名为picGis，代码如下所示：
     private void picGis_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
                return;
            if (ispanning == true)
            {
                PointClass m_point=new PointClass();
                m_point.X = e.X;
                m_point.Y = e.Y;
                IPoint m_ipoint = m_MapOperate.ScreenPointToMapPoint(m_point);//将鼠标的位置坐标转换成图形坐标
                startX = m_ipoint.X;
                startY = m_ipoint.Y;
                startDragX = e.X;
                startDragY = e.Y;
            }
        }

        private void picGis_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
                return;
            if (ispanning==true)
            {
                // drag the image
                picGis.Image = null;
                deltaDragX = startDragX - e.X;
                deltaDragY = startDragY - e.Y;
                picGis.Invalidate();
            }
        }

        private void picGis_MouseUp(object sender, MouseEventArgs e)
        {
if (e.Button != MouseButtons.Left)

return;

if (ispanning==true )

{

this.Cursor = Cursors.WaitCursor;

PointClass m_point = new PointClass();

m_point.X = e.X;

m_point.Y = e.Y;

IPoint m_ipoint = m_MapOperate.ScreenPointToMapPoint(m_point);//记录漫游终结点的屏幕坐标并将其转换成图形坐标

double deltaX = m_ipoint.X - startX;

double deltaY = m_ipoint.Y - startY;

//change the extent and draw

fuzhou.MapDescription pMapDescription =m_MapOperate.getMapDescription() ;

fuzhou.EnvelopeN pEnvelope = pMapDescription.MapArea.Extent as fuzhou.EnvelopeN;

pEnvelope.XMax = pEnvelope.XMax - deltaX;

pEnvelope.XMin = pEnvelope.XMin - deltaX;

pEnvelope.YMax = pEnvelope.YMax - deltaY;

pEnvelope.YMin = pEnvelope.YMin - deltaY;

fuzhou.MapExtent pMapExtext = new fuzhou.MapExtent();

pMapExtext.Extent = pEnvelope;

pMapDescription.MapArea = pMapExtext;

// save the map description and draw the map

m_MapOperate.SetMapDescription( pMapDescription);

                m_MapOperate.drawMap(ref pMapDescription, picGis);
                deltaDragX = 0;
                deltaDragY = 0;
                picGis.Invalidate();
                this.Cursor = Cursors.Default;
            }
        }
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