地图分幅算法的AE实现.doc

地图分幅算法的AE实现 public enum ScaleMark { A, B, C, D, E, F, G, H };//不同比例尺的号码 private int m_1s1000000_row;//1:100万图幅行 private int m_1s1000000_list;//1：100万图幅列 private int m_assign_row;//指定比例尺图幅行 private int m_assign_list;//指定比例尺图幅列 private int m_scale;//指定比例尺; private FrmGeocodingExport pFGE; private esriUnits m_CurMapUnits; #region 图幅号计算函数 private IEnvelope FromGeocodingDawn() { //计算要素的值 int h = this.m_1s1000000_row ;//1:100万行号 int l = this.m_1s1000000_list ;//1:100万列号 ScaleMark ScaleMark_1s1000000 = new ScaleMark(); IPoint scaleDelta_1s1000000 = new PointClass(); ScaleMark_1s1000000 = 0; this.initialScaleMark(ScaleMark_1s1000000, scaleDelta_1s1000000); double delta_x = scaleDelta_1s1000000.X;//1：100万经差(度) double delta_y = scaleDelta_1s1000000.Y;//1：100万纬差(度) ScaleMark pScaleMark = new ScaleMark(); IPoint scaleDelta = new PointClass(); pScaleMark = (ScaleMark )m_scale ; this.initialScaleMark(pScaleMark , scaleDelta); double delta_xp = scaleDelta.X;//1：10万经差(度) double delta_yp = scaleDelta.Y;//1：10万纬差(度) int hp = m_assign_row; int lp = m_assign_list; IEnvelope pEnvelope = new EnvelopeClass(); if (m_assign_list != 0 m_assign_row != 0) { //进行指定图幅号左上角点经纬度计算 double ymax = h * delta_y - (hp - 1) * delta_yp; //纬度 double xmin = (l - 31) * delta_x + (lp - 1) * delta_xp;//经度 //推算指定图幅号右下角点坐标 double ymin = ymax - delta_yp; double xmax = xmin + delta_xp; //将点转换成地图存储单位Map(Metres) convertUnits //esriUnits CurMapUnits = this.axMapControl1.Map.MapUnits; IUnitConverter UC_map = new UnitConverterClass(); d