ChartDirector 6.0 (ASP/COM/VB Edition)

Custom Scatter Labels




This example demonstrates adding custom labels to data points.

Source Code Listing

[Web Version (in ASP)] aspdemo\scatterlabels.asp
<%@ language="vbscript" %>
<%
Set cd = CreateObject("ChartDirector.API")

' The XY points for the scatter chart
dataX = Array(150, 400, 300, 1500, 800)
dataY = Array(0.6, 8, 5.4, 2, 4)

' The labels for the points
labels = Array("Nano<*br*>100", "SpeedTron<*br*>200 Lite", "SpeedTron<*br*>200", _
    "Marathon<*br*>Extra", "Marathon<*br*>2000")

' Create a XYChart object of size 450 x 400 pixels
Set c = cd.XYChart(450, 400)

' Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
' Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
Call c.setPlotArea(55, 40, 350, 300, &Hffffff, -1, &Hc0c0c0, &Hc0c0c0, -1)

' Add a title to the chart using 18pt Times Bold Itatic font.
Call c.addTitle("Product Comparison Chart", "timesbi.ttf", 18)

' Add a title to the y axis using 12pt Arial Bold Italic font
Call c.yAxis().setTitle("Capacity (tons)", "arialbi.ttf", 12)

' Add a title to the x axis using 12pt Arial Bold Italic font
Call c.xAxis().setTitle("Range (miles)", "arialbi.ttf", 12)

' Set the axes line width to 3 pixels
Call c.xAxis().setWidth(3)
Call c.yAxis().setWidth(3)

' Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
Set layer = c.addScatterLayer(dataX, dataY, "", cd.GlassSphereShape, 15, &Hff3333, &Hff3333)

' Add labels to the chart as an extra field
Call layer.addExtraField(labels)

' Set the data label format to display the extra field
Call layer.setDataLabelFormat("{field0}")

' Use 8pt Arial Bold to display the labels
Set textbox = layer.setDataLabelStyle("arialbd.ttf", 8)

' Set the background to purple with a 1 pixel 3D border
Call textbox.setBackground(&Hcc99ff, cd.Transparent, 1)

' Put the text box 4 pixels to the right of the data point
Call textbox.setAlignment(cd.Left)
Call textbox.setPos(4, 0)

' Output the chart
Response.ContentType = "image/png"
Response.BinaryWrite c.makeChart2(cd.PNG)
Response.End
%>

[Windows Version (in Visual Basic)] vbdemo\scatterlabels.cls
Public Sub createChart(viewer As Object, chartIndex As Integer)

    Dim cd As New ChartDirector.API

    ' The XY points for the scatter chart
    Dim dataX()
    dataX = Array(150, 400, 300, 1500, 800)
    Dim dataY()
    dataY = Array(0.6, 8, 5.4, 2, 4)

    ' The labels for the points
    Dim labels()
    labels = Array("Nano<*br*>100", "SpeedTron<*br*>200 Lite", "SpeedTron<*br*>200", _
        "Marathon<*br*>Extra", "Marathon<*br*>2000")

    ' Create a XYChart object of size 450 x 400 pixels
    Dim c As XYChart
    Set c = cd.XYChart(450, 400)

    ' Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
    ' (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
    Call c.setPlotArea(55, 40, 350, 300, &Hffffff, -1, &Hc0c0c0, &Hc0c0c0, -1)

    ' Add a title to the chart using 18pt Times Bold Itatic font.
    Call c.addTitle("Product Comparison Chart", "timesbi.ttf", 18)

    ' Add a title to the y axis using 12pt Arial Bold Italic font
    Call c.yAxis().setTitle("Capacity (tons)", "arialbi.ttf", 12)

    ' Add a title to the x axis using 12pt Arial Bold Italic font
    Call c.xAxis().setTitle("Range (miles)", "arialbi.ttf", 12)

    ' Set the axes line width to 3 pixels
    Call c.xAxis().setWidth(3)
    Call c.yAxis().setWidth(3)

    ' Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
    Dim layer As ScatterLayer
    Set layer = c.addScatterLayer(dataX, dataY, "", cd.GlassSphereShape, 15, &Hff3333, &Hff3333)

    ' Add labels to the chart as an extra field
    Call layer.addExtraField(labels)

    ' Set the data label format to display the extra field
    Call layer.setDataLabelFormat("{field0}")

    ' Use 8pt Arial Bold to display the labels
    Dim textbox As ChartDirector.TextBox
    Set textbox = layer.setDataLabelStyle("arialbd.ttf", 8)

    ' Set the background to purple with a 1 pixel 3D border
    Call textbox.setBackground(&Hcc99ff, cd.Transparent, 1)

    ' Put the text box 4 pixels to the right of the data point
    Call textbox.setAlignment(cd.Left)
    Call textbox.setPos(4, 0)

    ' Output the chart
    Set viewer.Picture = c.makePicture()

    'include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
        "title='Range = {x} miles, Capacity = {value} tons'")

End Sub