该范例程序会演示如何绘制全国省、市、区县、乡镇街道行政区划边界。
1、支持对行政区划进行边界裁剪显示
2、支持绘制行政区划的所有子区划，例如：绘制北京市东城区的所有乡镇街道规划
3、支持全国乡镇街道区划绘制
注意1：太乐地图.NET控件 名称统一命名为：MapControl
注意2：该范例程序涉需要全国行政区划矢量数据库支持，范例程序中自带最新版本数据库：BaiduData.db，您也可以点我下载。
注意3：该范例程序涉及到1个地图事件：DrawPolygon
范例运行后界面如下图所示：
绘制全国行政区划
/// <summary> /// 选择行政区划后的名称的填充 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void SelectPczCmd_Executed(object sender, EventArgs e) { if (sender == null) return;
var cbx = sender as ComboBox; if (cbx == null) return; var selectedItem = cbx.SelectedItem; if (selectedItem == null) return;
if (sender == comboBox1) { // 选择省或直辖市或特别行政区 comboBox2.Items.Clear(); comboBox3.Items.Clear(); comboBox5.Items.Clear();
if (selectedItem is Province) { var province = selectedItem as Province; // 填充市名称 FillCities(comboBox2, province); } if (selectedItem is City) { var city = selectedItem as City; // 填充区县名称 FillZones(comboBox2, city); } } if (sender == comboBox2) { // 选择市 comboBox3.Items.Clear(); comboBox5.Items.Clear();
if (selectedItem is City) { var city = selectedItem as City; // 填充区县名称 FillZones(comboBox3, city); } if (selectedItem is Zone) { var zone = selectedItem as Zone; // 填充乡镇名称 FillTowns(comboBox3, zone); } } if (sender == comboBox3) { // 选择区县 comboBox5.Items.Clear(); if (selectedItem is Zone) { var zone = selectedItem as Zone; // 填充乡镇名称 FillTowns(comboBox5, zone); } }
DrawProvinceCityZoneTown(cbx); }
/// <summary> /// 填充省、直辖市和特别行政区名称 /// </summary> private void FillProvices() { var provinces = BaiduDBHelper.GetProvinces(); // 获取省数据 var cities = BaiduDBHelper.GetMunicipalities(); // 获取直辖市或特别行政区数据 comboBox1.Items.Clear(); comboBox1.Items.Add(new Province { Name = "" }); foreach (var city in cities) { comboBox1.Items.Add(city); } foreach (var province in provinces) { comboBox1.Items.Add(province); } comboBox1.DisplayMember = "Name"; }
/// <summary> /// 填充市名称 /// </summary> /// <param name="combo"></param> /// <param name="province"></param> private void FillCities(ComboBox combo, Province province) { var cities = BaiduDBHelper.GetCities(province); // 获取市数据 combo.Items.Clear(); combo.Items.Add(new City { Name = "" }); foreach (var city in cities) { combo.Items.Add(city); } combo.DisplayMember = "Name"; }
/// <summary> /// 填充区县名称 /// </summary> /// <param name="combo"></param> /// <param name="city"></param> private void FillZones(ComboBox combo, City city) { var zones = BaiduDBHelper.GetZones(city); // 获取区县数据 combo.Items.Clear(); combo.Items.Add(new Zone { Name = "" }); foreach (var zone in zones) { combo.Items.Add(zone); } combo.DisplayMember = "Name"; }
/// <summary> /// 填充乡镇名称 /// </summary> /// <param name="combo"></param> /// <param name="city"></param> private void FillTowns(ComboBox combo, Zone zone) { var towns = BaiduDBHelper.GetTowns(zone); // 获取乡镇数据 combo.Items.Clear(); combo.Items.Add(new Town { Name = "" }); foreach (var town in towns) { combo.Items.Add(town); } combo.DisplayMember = "Name"; }
/// <summary> /// 绘制行政区划 /// </summary> private void DrawProvinceCityZoneTown(ComboBox cbx) { if (cbx == null) return; Object selectedItem = cbx.SelectedItem; if (selectedItem == null) return; var pczt = selectedItem as AdministrativeDivision; if (string.IsNullOrEmpty(pczt.Name)) return;
_graphicLayer.Clear(); MapRoute route = pczt.Boundaries; String name = pczt.Name; string area = pczt.Area; string length = pczt.Length;
var g = new AZMapPolygon(route.Points, name); { // 不同的行政区划，不同的绘制样式 if (pczt is Province) { g.Stroke = new Pen(Color.FromArgb(200, Color.Blue)) // 边线颜色 { Width = 3, // 粗细 DashStyle = DashStyle.Dash // 样式（这里使用 实心线 的样式） }; g.Fill = new SolidBrush(Color.FromArgb(20, Color.Blue)); // 填充色 } if (pczt is City) { g.Stroke = new Pen(Color.FromArgb(200, Color.Red)) // 边线颜色 { Width = 3, // 粗细 DashStyle = DashStyle.DashDot // 样式（这里使用 实心线 的样式） }; g.Fill = new SolidBrush(Color.FromArgb(20, Color.Red)); // 填充色 } if (pczt is Zone) { g.Stroke = new Pen(Color.FromArgb(200, Color.Yellow)) // 边线颜色 { Width = 3, // 粗细 DashStyle = DashStyle.Solid // 样式（这里使用 实心线 的样式） }; g.Fill = new SolidBrush(Color.FromArgb(20, Color.Yellow)); // 填充色 } if (pczt is Town) { g.Stroke = new Pen(Color.FromArgb(200, Color.Green)) // 边线颜色 { Width = 3, // 粗细 DashStyle = DashStyle.Solid // 样式（这里使用 实心线 的样式） }; g.Fill = new SolidBrush(Color.FromArgb(20, Color.Green)); // 填充色 } g.Title = name; // 显示区划名称 g.IsHitTestVisible = true; g.EnableRightClick = true;
// 绘制鼠标提示 if (g.To != null) { var marker = new AZMapMarkerEllipse(g.To.Value) { ToolTipText = String.Format("{2}\r\n面积：{0}平方千米\r\n长度：{1}千米", area, length, name), ToolTipMode = MarkerTooltipMode.OnMouseOver }; g.ToolTipMarker = marker; } g.ToolTipPosition = MapRouteToolTipPosition.LastPoint; } _graphicLayer.Polygons.Add(g);
MapControl.ZoomAndCenterRoute(g);
// 设置要裁剪的区域 MapControl.ClipBoundry = route.Points; MapControl.ClipBoundryKey = pczt.Id; if (MapControl.IsClip) { MapControl.ReloadMap(); } // 设置选择的区划用于绘制子区划 _currentPCZT = pczt; }
/// <summary> /// 边界裁剪 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void checkBox3_CheckedChanged(object sender, EventArgs e) { MapControl.IsClip = checkBox3.Checked; if (!checkBox3.Checked && MapControl.ClipBoundry == null) return;
if (checkBox3.Checked && MapControl.ClipBoundry == null) { MessageBox.Show(this, "请先选择行政区划"); return; }
// 设置裁剪的后的背景色 MapControl.EmptyTileColor = Color.WhiteSmoke; MapControl.ReloadMap(); }
/// <summary> /// 绘制子区划 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void checkBox4_CheckedChanged(object sender, EventArgs e) { _graphicLayer.Clear(); if (checkBox4.Checked) { if (_currentPCZT is Province) { var province = _currentPCZT as Province; var cities = BaiduDBHelper.GetCities(province); foreach (var city in cities) { _graphicLayer.Polygons.Add(BuildPolygon(city.Boundaries.Points, city.Name)); } } else if (_currentPCZT is City) { var city = _currentPCZT as City; var zones = BaiduDBHelper.GetZones(city); foreach (var zone in zones) { _graphicLayer.Polygons.Add(BuildPolygon(zone.Boundaries.Points, zone.Name)); } } else if (_currentPCZT is Zone) { var zone = _currentPCZT as Zone; var towns = BaiduDBHelper.GetTowns(zone); foreach (var town in towns) { _graphicLayer.Polygons.Add(BuildPolygon(town.Boundaries.Points, town.Name)); } } } }
/// <summary> /// 构建一个随机色的多边形 /// </summary> /// <param name="points"></param> /// <param name="name"></param> /// <returns></returns> private AZMapPolygon BuildPolygon(List<PointLatLng> points, string name) { Random ran = new Random(Guid.NewGuid().GetHashCode());
int R, G, B; double Y; bool result;
do { R = ran.Next(0, 255); G = ran.Next(0, 255); B = ran.Next(0, 255);
//Y值计算公式 Y = 0.299 * R + 0.587 * G + 0.114 * B;
result = Y >= 10 && Y <= 50; } while (!result); Color color = Color.FromArgb(180, R, G, B);
var stroke = new Pen(color) { Width = 1, DashStyle = System.Drawing.Drawing2D.DashStyle.Solid }; var fill = new SolidBrush(color); return new AZMapPolygon(points, name) { Stroke = stroke, Fill = fill, Title = name, IsHitTestVisible = false, EnableRightClick = false, EnableDoubleClick = false, EnableEdit = false }; }
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