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```