Winform中Chart控件的应用案例

Imports System.Windows.Forms.DataVisualization.Charting ... ' Create charts for each data point CreateChartInSeriesPoints(Chart1, Chart1.Series("Default"), "Pie"); ... '/ <summary> '/ Creates a mini-chart in the data points of the original Point or Bubble chart. '/ </summary> '/ <param name="chart">Chart object.</param> '/ <param name="series">Original data series.</param> '/ <param name="chartType">Mini-chart type.</param> Public Sub CreateChartInSeriesPoints(chart As Chart, series As Series, chartType As String) '**************************************************** '** Check if series uses X values or they all set '** to zeros (in this case use point index as X value) '**************************************************** Dim zeroXValues As Boolean = True Dim point As DataPoint For Each point In series.Points If point.XValue <> 0.0 Then zeroXValues = False Exit ForEach End If Next point '**************************************************** '** Calculate bubble scaling variables required to '** for the bubble size calculations. '**************************************************** Dim bubbleChart As Boolean = False ' Minimum/Maximum bubble size Dim maxPossibleBubbleSize As Double = 15F Dim minPossibleBubbleSize As Double = 3F Dim maxBubleSize As Single = 0F Dim minBubleSize As Single = 0F ' Current min/max size of the bubble size Dim minAll As Double = Double.MaxValue Dim maxAll As Double = Double.MinValue ' Bubble size difference value Dim valueDiff As Double = 0 Dim valueScale As Double = 1 ' Check for the Bubble chart type If series.ChartType = SeriesChartType.Bubble Then bubbleChart = True ' Check if custom attributes are set to specify scale If series.IsCustomPropertySet("BubbleScaleMin") Then minAll = Math.Min(minAll, [Double].Parse(series("BubbleScaleMin"))) End If If series.IsCustomPropertySet("BubbleScaleMax") Then maxAll = Math.Max(maxAll, [Double].Parse(series("BubbleScaleMax"))) End If ' Calculate bubble scale Dim minSer As Double = Double.MaxValue Dim maxSer As Double = Double.MinValue Dim ser As Series For Each ser In chart.Series If ser.ChartType = SeriesChartType.Bubble And ser.ChartArea = series.ChartArea Then Dim point As DataPoint For Each point In ser.Points minSer = Math.Min(minSer, point.YValues(1)) maxSer = Math.Max(maxSer, point.YValues(1)) Next point End If Next ser If minAll = Double.MaxValue Then minAll = minSer End If If maxAll = Double.MinValue Then maxAll = maxSer End If ' Calculate maximum bubble size Dim areaSize As SizeF = chart.ChartAreas(series.ChartArea).Position.GetSize() ' Convert relative coordinates to absolute coordinates areaSize.Width = areaSize.Width *(chart.Width - 1) / 100F areaSize.Height = areaSize.Height *(chart.Height - 1) / 100F maxBubleSize = CSng(Math.Min(areaSize.Width, areaSize.Height) /(100.0 / maxPossibleBubbleSize)) minBubleSize = CSng(Math.Min(areaSize.Width, areaSize.Height) /(100.0 / minPossibleBubbleSize)) ' Calculate scaling variables depending on the Min/Max values If maxAll = minAll Then valueScale = 1 valueDiff = minAll -(maxBubleSize - minBubleSize) / 2F Else valueScale =(maxBubleSize - minBubleSize) /(maxAll - minAll) valueDiff = minAll End If End If '**************************************************** '** Create chart area for each data point '**************************************************** Dim pointIndex As Integer = 0 Dim random As New Random() Dim point As DataPoint For Each point In series.Points '**************************************************** '** Create chart area and set visual attributes '**************************************************** Dim areaPoint As ChartArea = chart.ChartAreas.Add((series.Name + "_" + pointIndex.ToString())) areaPoint.BackColor = Color.Transparent areaPoint.BorderWidth = 0 areaPoint.AxisX.LineWidth = 0 areaPoint.AxisY.LineWidth = 0 areaPoint.AxisX.MajorGrid.Enabled = False areaPoint.AxisX.MajorTickMark.Enabled = False areaPoint.AxisX.LabelStyle.Enabled = False areaPoint.AxisY.MajorGrid.Enabled = False areaPoint.AxisY.MajorTickMark.Enabled = False areaPoint.AxisY.LabelStyle.Enabled = False '**************************************************** '** Create data series in the chart area '**************************************************** Dim seriesPoint As Series = chart.Series.Add((series.Name + "_" + pointIndex.ToString())) seriesPoint.ChartArea = areaPoint.Name seriesPoint.ChartType = CType([Enum].Parse(GetType(SeriesChartType), chartType, True), SeriesChartType) seriesPoint.IsVisibleInLegend = False seriesPoint.BorderColor = Color.FromArgb(64, 64, 64) seriesPoint.ShadowOffset = 2 seriesPoint.Palette = ChartColorPalette.Pastel '**************************************************** '** Populate data series. '** TODO: For this sample each series is populated '** with random data. Do your own series population '** here. '**************************************************** Dim sliceIndex As Integer For sliceIndex = 0 To 4 seriesPoint.Points.AddY(random.Next(2, 20)) Next sliceIndex '**************************************************** '** Set chart area position and inner plot position '**************************************************** ' Set chart area inner plot position areaPoint.InnerPlotPosition = New ElementPosition(3, 3, 94, 94) ' Position chart area over the data point Dim position As PointF = PointF.Empty position.X = CSng(chart.ChartAreas(series.ChartArea).AxisX.GetPosition((If zeroXValues Then pointIndex + 1 Else point.XValue))) 'ToDo: Unsupported feature: conditional (?) operator. position.Y = CSng(chart.ChartAreas(series.ChartArea).AxisY.GetPosition(point.YValues(0))) Dim pieSize As Single = (If point.MarkerSize < 15 Then 15 Else point.MarkerSize) 'ToDo: Unsupported feature: conditional (?) operator. If bubbleChart Then pieSize = CSng((point.YValues(1) - valueDiff) * valueScale) + minBubleSize End If pieSize = pieSize * 100F / CSng(chart.Width - 1) areaPoint.Position = New ElementPosition(position.X - pieSize / 2F, position.Y - pieSize / 2F, pieSize, pieSize) ' Increase point index pointIndex += 1 Next point End Sub 'CreateChartInSeriesPoints