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-ljb ：
请教：谁知道地图上怎样实现GPS导航?
如题，或是怎样制作GPS导航地图啊
jerry429 ：
可以使用animation，例如以下代码：
Code example for using an animation layer in MapXtreme 2004： C# Sample private void mapToolBar1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
{
switch (e.Button.Tag.ToString())
{
case "Start":
timer1.Start();
break;
case "Stop":
timer1.Stop();
break;
}
} private void timer1_Tick(object sender, System.EventArgs e)
{
MapInfo.Data.MIConnection conn = new MapInfo.Data.MIConnection();
conn.Open();
MapInfo.Data.MICommand cmd = conn.CreateCommand();
if (DateTime.Now.TimeOfDay.Seconds % 4 == 0)
{
ftr.Geometry.GeometryEditor.OffsetByXY(0, -10, MapInfo.Geometry.DistanceUnit.Mile, MapInfo.Geometry.DistanceType.Spherical);
}
else
{
ftr.Geometry.GeometryEditor.OffsetByXY(10, 0, MapInfo.Geometry.DistanceUnit.Mile, MapInfo.Geometry.DistanceType.Spherical);
} ftr.Geometry.EditingComplete();
cmd.CommandText = "Update Animation Set obj = @obj Where MI_Key = '1'";
cmd.Parameters.Add("@obj", ftr.Geometry);
cmd.ExecuteNonQuery();
conn.Close();
} private void btnCreateAnimation_Click(object sender, System.EventArgs e)
{
MapInfo.Data.MIConnection conn = new MapInfo.Data.MIConnection();
MapInfo.Data.Table tbl;
conn.Open();
//Make sure that the temporary table does not exist before creating
tbl = conn.Catalog.GetTable("Animation");
if (tbl != null)
{
conn.Catalog.CloseTable("Animation");
} //Create temp layer
MapInfo.Data.TableInfoMemTable ti = new MapInfo.Data.TableInfoMemTable("Animation");
ti.Columns.Add(MapInfo.Data.ColumnFactory.CreateFeatureGeometryColumn(mapControl1.Map.GetDisplayCoordSys()));
ti.Columns.Add(MapInfo.Data.ColumnFactory.CreateStyleColumn());
ti.Temporary = true;
tbl = conn.Catalog.CreateTable(ti);
MapInfo.Mapping.FeatureLayer lyr = new MapInfo.Mapping.FeatureLayer(tbl, "Animation");
mapControl1.Map.Layers.Add(lyr); //Create point for animation
MapInfo.Geometry.FeatureGeometry fg = new MapInfo.Geometry.Point(lyr.CoordSys, -12000000, 4600000);
MapInfo.Styles.CompositeStyle cs = new MapInfo.Styles.CompositeStyle(new MapInfo.Styles.SimpleVectorPointStyle(37, System.Drawing.Color.Purple, 10)); MapInfo.Data.MICommand cmd = conn.CreateCommand();
ftr = new MapInfo.Data.Feature(fg, cs);
tbl.InsertFeature(ftr);
lyr.VolatilityHint = MapInfo.Mapping.LayerVolatilityHint.Animate;
conn.Close();
} |