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正在使用Zedgraph图表库,但我似乎无法根据特定条件为条形图着色。以下是this tutorial上的示例。使用Zedgraph库的条形图上的自定义颜色
在我的情况下,如果value
不超过50-这是student.pass_mark
变量,我想为红色着色,如果它的高于50,我想为它着绿色。以下是我的代码。迄今只给我冲,即使我有100个值,80,110等
Dim subject As String
Dim grade As Decimal
Dim colors As Color() = {}
Dim subject_names As String() = {}
For i = 0 To student.no_of_subjects
ReDim Preserve colors(i)
ReDim Preserve subject_names(i)
subject = student.subject_name
grade = student.grade
Dim x As Double = CDbl(i) + 1
Dim y As Double = grade
Dim z As Double = 0
list.Add(x, y, z)
If grade < student.pass_mark Then
colors(i) = Color.Red
Else
colors(i) = Color.Green
End If
subject_names(i) = subject
Next
Dim myCurve As BarItem = myPane.AddBar("Student Subject", list, Color.Blue)
'Dim colors As Color() = {Color.Red, Color.Yellow, Color.Green, Color.Blue, Color.Purple}
myCurve.Bar.Fill = New Fill(colors)
myCurve.Bar.Fill.Type = FillType.Solid
myCurve.Bar.Fill.RangeMin = 0
myCurve.Bar.Fill.RangeMax = 4
myPane.Chart.Fill = New Fill(Color.White, Color.FromArgb(220, 220, 255), 45)
myPane.Fill = New Fill(Color.White, Color.FromArgb(255, 255, 225), 45)
' Tell ZedGraph to calculate the axis ranges
' Set the XAxis labels
myPane.XAxis.Scale.TextLabels = subject_names
' Set the XAxis to Text type
myPane.XAxis.Type = ZedGraph.AxisType.Text
ZedChart.IsShowPointValues = True
ZedChart.AxisChange()
ZedChart.Refresh()
另外,我想提请在整个图表,显示了pass_mark线,使其迅速可见的是一个学生'已经或没有通过某个科目的比较