arcgis缩小图片

来源：互联网发布：电视节目直播软件编辑：程序博客网时间：2024/05/01 19:12

public void ZoomOut(PictureBox m_PictureBox)
        {
            fuzhou.MapDescription pMapDescription = m_sMapDesc;
            fuzhou.EnvelopeN pEnvelope = pMapDescription.MapArea.Extent as fuzhou.EnvelopeN;
            double eWidth = Math.Abs(pEnvelope.XMax - pEnvelope.XMin);
            double eHeight = Math.Abs(pEnvelope.YMax - pEnvelope.YMin);
            double xFactor = (eWidth - (eWidth * 1.5)) / 2;
            double yFactor = (eHeight - (eHeight * 1.5)) / 2;
            pEnvelope.XMax = pEnvelope.XMax - xFactor;
            pEnvelope.XMin = pEnvelope.XMin + xFactor;
            pEnvelope.YMax = pEnvelope.YMax - yFactor;
            pEnvelope.YMin = pEnvelope.YMin + yFactor;
            fuzhou.MapExtent pMapExtext = new fuzhou.MapExtent();
            pMapExtext.Extent = pEnvelope;
            pMapDescription.MapArea = pMapExtext;
            m_sMapDesc = pMapDescription;
            drawMap(ref pMapDescription, m_PictureBox);
         }
放大操作的基本原理是取得当前的地图描述MapDescription，然后按照比例计算出放大或缩小的比例。在得出按照比例计算出来的周边坐标，然后将其提交服务器，取得图形进行显示。
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