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
