ChartDirector 6.0 (ASP/COM/VB Edition)

Vector Chart




This example demonstrates a vector chart.

A vector chart is like a scatter chart, but the symbols are arrows which can be of arbitrary lengths pointing to arbitrary directions. Thus each symbol in a vector chart is specified by 4 values - the x and y coordinates, the length and the direction.

In ChartDirector, an XY vector layer is created using XYChart.addVectorLayer.

Source Code Listing

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

' The (x, y) coordinates of the starting point of the vectors
dataX = Array(20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, 80, _
    100, 20, 40, 60, 80, 100)
dataY = Array(20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80, 80, _
    100, 100, 100, 100, 100)

' The lengths (radii) and directions (angles) of the vectors
dataR = Array(6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6, 6)
dataA = Array(-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135, _
    180, 135, 120, -135, -150, 180, 150, 135)

' Create a XYChart object of size 450 x 390 pixels
Set c = cd.XYChart(450, 390)

' 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, -1, -1, &Hc0c0c0, &Hc0c0c0, -1)

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

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

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

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

' Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to 11 pixels
Call c.addVectorLayer(dataX, dataY, dataR, dataA, cd.YAxisScale, &H0000cc).setArrowHead(11)

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

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

    Dim cd As New ChartDirector.API

    ' The (x, y) coordinates of the starting point of the vectors
    Dim dataX()
    dataX = Array(20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, _
        80, 100, 20, 40, 60, 80, 100)
    Dim dataY()
    dataY = Array(20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80, _
        80, 100, 100, 100, 100, 100)

    ' The lengths (radii) and directions (angles) of the vectors
    Dim dataR()
    dataR = Array(6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6,6)
    Dim dataA()
    dataA = Array(-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135, _
        180, 135, 120, -135, -150, 180, 150, 135)

    ' Create a XYChart object of size 450 x 390 pixels
    Dim c As XYChart
    Set c = cd.XYChart(450, 390)

    ' 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, -1, -1, &Hc0c0c0, &Hc0c0c0, -1)

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

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

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

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

    ' Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to 11
    ' pixels
    Call c.addVectorLayer(dataX, dataY, dataR, dataA, cd.YAxisScale, &H0000cc).setArrowHead(11)

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

    'include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
        "title='Vector at ({x}, {value}): Length = {len}, Angle = {dir} deg'")

End Sub