Private Sub Command6_Click()
Screen.MousePointer = vbHourglass
Map1.Layers("necenter").Visible = True
Set Map1.Layers("counties").renderer = Nothing
Set layer = Map1.Layers("necenter")
Set layer.renderer = New ClassBreaksRenderer
Set r = layer.renderer
r.Field = "P_OTHER"
r.SymbolType = layer.Symbol.SymbolType
'设置统计对象
Set stats = layer.Records.CalculateStatistics("P_OTHER")
'以字段P_OTHER的标准差为区间长度,在P_OTHER字段的平均值附近生成7个区间
Dim breakval As Double
breakval = stats.Mean - (stats.StdDev * 3)
For i = 0 To 6
If breakval >= stats.Min And breakval <= stats.Max Then
r.BreakCount = r.BreakCount + 1
r.Break(r.BreakCount - 1) = breakval
End If
breakval = breakval + stats.StdDev
Next i
'使用SizeSymbols改变区间序列符号的大小
r.SizeSymbols 3, 8
For i = 0 To r.BreakCount
'将所有区间颜色变成红色
r.Symbol(i).Color = moRed
Next i
Map1.Refresh
Screen.MousePointer = vbDefault
End Sub
Private Sub Command8_Click()
Set Map1.Extent = Map1.FullExtent
End Sub
Private Sub Form_Load()
Command1.Caption = "单一符号"
Command2.Caption = "点密度(DotDensityRenderer)"
Command3.Caption = "唯一值图(ValueMapRenderer)"
Command4.Caption = "标准差图(ClassBreakRenderer)"
Command5.Caption = "数量分类图(ClassBreakRenderer)"
Command6.Caption = "渐变符号图(ClassBreakRenderer)"
Command7.Caption = "文本标注图(LabelRenderer)"
Command8.Caption = "全图显示"
Dim dc As New MapObjects2.DataConnection
dc.Database = "D:Program FilesESRIMapObjects2SamplesDataNorthEast"
If Not dc.Connect Then Exit Sub
Dim layer As New MapObjects2.MapLayer
layer.GeoDataset = dc.FindGeoDataset("Counties")
layer.Symbol.Color = RGB(0, 0, 250)
Map1.Layers.Add layer
Set layer = New MapLayer
layer.GeoDataset = dc.FindGeoDataset("NeCenter")
layer.Visible = False
Map1.Layers.Add layer
End Sub
Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 1 Then
Dim tmpExtent As MapObjects2.Rectangle
Set tmpExtent = Map1.TrackRectangle
Map1.Extent = tmpExtent
ElseIf Button = 2 Then
Dim r As MapObjects2.Rectangle
Set r = Map1.Extent
r.ScaleRectangle 1.5
Map1.Extent = r
End If
End Sub
ValueMapRenderer对象主要属性
DefaultSymbol属性: 返回绘制的MapLayer的缺省Symbol对象的引用
field属性: 设置着色所依据的属性字段
RotationField属性:设置点状符号的旋转角度,仅仅对点对象且Symbol的Style的属性为moTrueTypemarker的图层有效
ScalingField属性:设置相对反打倍数因子,仅仅对点对象且Symbol的Style的属性为moTrueTypemarker的图层有效
Symbol属性: 返回由属性字段的一系列唯一值所确定的Symbol对象的集合
SymbolType属性: 返回要显示的地理对象睦嘈?/p>
Tag属性: 用于填写描述信息
UseDefault属性: 设置是否采用DefaultSymbol
ValueCount属性: 唯一值序列中唯一值的个数
Value序列: 用Field指定的属性字段所产生的一系列唯一值
ClassBreaksRenderer对象属性
RampColors方法: 以渐变色的方法依次设置各个级别的符号的颜色属性,RampColors 颜色一,颜色二
SizeSymbol方法: 设置各个级别的符号对象的Size属性,SizeSymbol size1, size2
BreakCount属性: 区间分界点的数量
Break属性: 由区间分界点生成的区间序列
Field , Symbol, SymbolType, Tag同上
DotDensityRenderer对象属性
DotColor,DotSize分别设置点的颜色大小
DotValue属性: 点的基准值
DrawBackground属性: 除了显示点外还显示地理对象
Field , Tag属性同上
以上三种使用方法一般是:
Dim Xrenderer As MapObjects2.DotDensityRenderer
然后对各种属性设置
Set Map1.Layers("").renderer = renderer
2009年NCRE考试有新变化 |
2009年全国计算机等级考试大纲 |
2009年上半年全国计算机等级考试报名信息汇总 |