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();
double yMax = UC_map.ConvertUnits(ymax, esriUnits.esriDecimalDegrees, m_CurMapUnits);
double yMin = UC_map.ConvertUnits(ymin, esriUnits.esriDecimalDegrees, m_CurMapUnits);
double xMax = UC_map.ConvertUnits(xmax, esriUnits.esriDecimalDegrees, m_CurMapUnits);
double xMin = UC_map.ConvertUnits(xmin, esriUnits.esriDecimalDegrees, m_CurMapUnits);
pEnvelope.PutCoords(xMin, yMin, xMax, yMax);
return pEnvelope;
}
else
{
return null;
}
}
#endregion
#region 各比例尺经纬度差
private void initialScaleMark(ScaleMark pScaleMark, IPoint scaleDelta)
{
//IPoint[] scaleArr = new IPoint[8];
//IPoint scaleDelta = new PointClass();
switch (pScaleMark)
{
case ScaleMark.A:
scaleDelta.X = 6;//1：100万经差(度)
scaleDelta.Y = 4;//1：100万纬差(度)
break;
case ScaleMark.B:
scaleDelta.X = 3;//1：50万经差(度)
scaleDelta.Y = 2;//1：50万纬差(度)
break;
case ScaleMark.C:
scaleDelta.X = 1.5;//1：25万经差(度)
scaleDelta.Y = 1;//1：25万纬差(度)
break;