mapx+vb实战摘要

上个月去天津做这个项目，加班加点忙乎过了十一，现在项目终于完成了第一阶段，可以闲下来总结一下了。
   在做这个项目之前我只是自学了一个月的supermap，不过感觉gis这些东西都是大同小异，没什莫可怕；关键比较郁闷的是本来根本就是做.net，现在却要用vb实在太。。。算了，赶鸭子上架，不会也得会呀！    其实本人对这个实在只能称得上一知半解，学的和用的一样多，不过还是给自己和别人留下点东西吧，也许会有帮助呢：）
    1，设置地图标题（Map1.Title）样式
    在打开一个GeoSet时，会自动显示它的标题，如果你的GeoSet没有标题，它会自动添加一个标题。
    你可以设置标题的样式，显示出最完美的地图

     Map1.Title.Visible = False’是否可见
     Map1.Title.Editable = False'是否可编辑
     标题位置
    Map1.Title.x = Map1.MapScreenWidth - 50
    Map1.Title.y = 2
   是否有边界
    Map1.Title.Border = False
    是否粗体
   Map1.Title.TextStyle.TextFont.Bold = True
    字体大小
    Map1.Title.TextStyle.TextFont.Size = 15
   是否在文本周围绘制光晕
     Map1.Title.TextStyle.TextFontHalo = True
   控制文本是否显示背景色
     Map1.Title.TextStyle.TextFontOpaque = False
   是否在文本下绘制阴影
    Map1.Title.TextStyle.TextFontShadow = True

12 查找图元
   mapx查找地图上的图元有多种方法

  a, FindObj.Search
    这种方法在用的时候有局限性：数据集必须要有索引，查找的字段类型不能是10进制类型（可能还有其它的类型，忘了），否则在图上找不到。

     Set FindObj = fMainForm.Map1.Layers(LayerCombo.Text).Find
    Set FindObj.FindDataset = fMainForm.Map1.DataSets(LayerCombo.Text & " dataset")
    Set FindObj.FindField = FindObj.FindDataset.Fields(FieldCombo.Text)
    Set FoundFeature = FindObj.Search(FindText.Text)

If FoundFeature.FindRC Mod 10 = 1 Or FoundFeature.FindRC Mod 10 = 2 Then      
       fMainForm.Map1.Layers(LayerCombo.Text).Selection.Add FoundFeature
        fMainForm.Map1.AutoRedraw = False
        fMainForm.Map1.CenterX = FoundFeature.CenterX
        fMainForm.Map1.CenterY = FoundFeature.CenterY
   End If

  b,SQL语句方法

Dim ftrs As MapXLib.Features
Dim lyr As Layer
Dim i As Integer

Set lyr = fMainForm.Map1.Layers(RoadlyrName)
Dim strs As String
strs = Trim("路线编码 = " + Chr(34) + ComRoadID.List(ComRoadID.ListIndex) + Chr(34))‘在值前面加双引号如：ID="001",         观测点名称 like "%天平庄"
  Set ftrs = lyr.Search(strs)
  lyr.Selection.ClearSelection
lyr.Selection.Add ftrs
If ftrs.Count > 0 Then
fMainForm.Map1.CenterX = ftrs.Item(1).CenterX
fMainForm.Map1.CenterY = ftrs.Item(1).CenterY
End If

13显示鼠标当前的经纬度
Private Sub Map1_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
      Dim MX As Double, MY As Double
      Map1.ConvertCoord x, y, MX, MY, 1
        Text1.Item(1).Caption = "当前位置"
        Text1.Item(2).Caption = "东经 " & Format(MX, "###0.0000") + ",北纬 " + Format(MY, "###0.0000")               
        Text1.Item(3).Caption = " 当前图层"
        Text1.Item(4).Caption = Map1.Layers(1).Name
End Sub

14自动滚屏
Private Sub Map1_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
If mnuMoveCenter.Checked = True Then
    If x > Map1.MapScreenWidth - 10 Then
    Map1.CenterX = Map1.CenterX + 0.05
    Map1.Refresh
    Else
    If x < 10 Then
    Map1.CenterX = Map1.CenterX - 0.05
    Map1.Refresh
    Else
    If y > Map1.MapScreenHeight - 10 Then
    Map1.CenterY = Map1.CenterY - 0.05
    Map1.Refresh
    Else
    If y < 10 Then
    Map1.CenterY = Map1.CenterY + 0.05
    Map1.Refresh
    End If
    End If
    End If
    End If
End If
End Sub

15测距和测面积
Private Sub Form_Load()
  Map1.CreateCustomTool PolyRulerToolID, miToolTypePoly, miSizeAllCursor
    Map1.CreateCustomTool PolyAreaToolID, miToolTypePolygon, miSelectRegionMinusCursor
End Sub

Private Sub Map1_PolyToolUsed(ByVal ToolNum As Integer, ByVal flags As Long, ByVal Points As Object, ByVal bShift As Boolean, ByVal bCtrl As Boolean, EnableDefault As Boolean)
    If ToolNum = PolyRulerToolID Then
        Dim i As Integer
        Dim DistanceSoFar As Double
        Map1.MapUnit = RulerUnit
        DistanceSoFar = 0#
        If Points.Count > 1 Then
            For i = 2 To Points.Count
                DistanceSoFar = DistanceSoFar + Map1.Distance(Points.Item(i).x, Points.Item(i).y, Points.Item(i - 1).x, Points.Item(i - 1).y)
            Next
        End If
        If flags = miPolyToolEnd Then
            'First, clear the status bar
            Text1.Item(4).Caption = ""
            MsgBox "距离: " & DistanceSoFar & " " & RulerUnitString
        Else
            Text1.Item(3).Caption = "距离"
             Text1.Item(4).Caption = DistanceSoFar & " " & RulerUnitString
        End If
    End If
    If ToolNum = PolyAreaToolID Then
    '面积
     Map1.AreaUnit = miUnitSquareKilometer
    On Error Resume Next
    Dim apolygoN As New MapXLib.Feature
    Dim ax As Double
    If (Points.Count > 2) Then
    Set apolygoN = New Feature
    Set apolygoN = Map1.FeatureFactory.CreateRegion(Points)
    ax = apolygoN.Area
    MsgBox "面积: " & ax
    End If
End If
End Sub

1如何修改柱状专题图的样式？
Map1.DataSets.Item(DsName).Themes("trafficflubar").Properties.Size = BarSize
Map1.DataSets.Item(DsName).Themes("trafficflubar").Properties.BarWidth = BarWidth
Map1.DataSets.Item(DsName).Themes("trafficflubar").ThemeProperties.MultivarCategories.Item(1).style.RegionColor = SmallTruck_Color
Map1.DataSets.Item(DsName).Themes("trafficflubar").ThemeProperties.MultivarCategories.Item(2).style.RegionColor = MiddleTruck_Color
Map1.DataSets.Item(DsName).Themes("trafficflubar").ThemeProperties.MultivarCategories.Item(3).style.RegionColor = BigTruck_Color

2如何修改饼状专题图的样式？
Map1.DataSets.Item(DsName).Themes("trafficflupiebar").Properties.Size = PieBarSize
'Map1.DataSets.Item(DsName).Themes("trafficflupiebar").Properties.Width = PieBarWidth
Map1.DataSets.Item(DsName).Themes("trafficflupiebar").ThemeProperties.MultivarCategories.Item(1).style.RegionColor = SmallTruck_Color
Map1.DataSets.Item(DsName).Themes("trafficflupiebar").ThemeProperties.MultivarCategories.Item(2).style.RegionColor = MiddleTruck_Color
Map1.DataSets.Item(DsName).Themes("trafficflupiebar").ThemeProperties.MultivarCategories.Item(3).style.RegionColor = BigTruck_Color
Map1.DataSets.Item(DsName).Themes("trafficflupiebar").ThemeProperties.MultivarCategories.Item(4).style.RegionColor = SmallCar_Color

3如何修改标注的样式？
Set oStyle = New MapXLib.style
        oStyle.TextFont.Size = 12
        oStyle.TextFont.Bold = True
        oStyle.SymbolFontColor = vbWhite
        oStyle.TextFontBackColor = vbBlue
        oStyle.TextFontOpaque = True
        Map1.Annotations.AddText(rs(showfield), lyr.Selection(1).CenterX, lyr.Selection(1).CenterY, 3).Graphic.style = oStyle
        （白字黑底）

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zhangjie_xiaoke/archive/2008/03/05/2151357.aspx