This example demonstrates how to create a rose chart.
A rose chart is basically a polar chart with sectors of variable radius. This can be achieved by creating a
PolarChart object as the graph paper, and adding sector zones on it using
AngularAxis.addZone.
To enable auto-scale of the axis, in this example, we also add the radius data to a transparent line layer using
PolarChart.addLineLayer. The line layer has no visible effect, but it causes the radial axis to auto-scale so that it covers the radius data.
[Web Version (in ASP)] aspdemo\rose.asp
<%@ language="vbscript" %>
<%
Set cd = CreateObject("ChartDirector.API")
' Data for the chart
data = Array(9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6, 1.5, 2.2, 5.1, _
4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5)
angles = Array(0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, _
270, 285, 300, 315, 330, 345)
' Create a PolarChart object of size 460 x 460 pixels, with a silver background and a 1 pixel 3D
' border
Set c = cd.PolarChart(460, 460, cd.silverColor(), &H000000, 1)
' Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use white text
' on deep blue background.
Call c.addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15, &Hffffff _
).setBackground(&H000080)
' Set plot area center at (230, 240) with radius 180 pixels and white background
Call c.setPlotArea(230, 240, 180, &Hffffff)
' Set the grid style to circular grid
Call c.setGridStyle(False)
' Set angular axis as 0 - 360, with a spoke every 30 units
Call c.angularAxis().setLinearScale(0, 360, 30)
' Add sectors to the chart as sector zones
For i = 0 To UBound(data)
Call c.angularAxis().addZone(angles(i), angles(i) + 15, 0, data(i), &H33ff33, &H008000)
Next
' Add an Transparent invisible layer to ensure the axis is auto-scaled using the data
Call c.addLineLayer(data, cd.Transparent)
' Output the chart
Set viewer = cd.WebChartViewer(Request, "chart1")
Call viewer.setChart(c, cd.SVG)
%>
<!DOCTYPE html>
<html>
<head>
<title>Simple Rose Chart</title>
<!-- Include ChartDirector Javascript Library to support chart interactions -->
<script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
<div style="font:bold 18pt verdana;">
Simple Rose Chart
</div>
<hr style="border:solid 1px #000080; background:#000080" />
<div style="font:10pt verdana; margin-bottom:1.5em">
<a href="viewsource.asp?file=<%= Request("SCRIPT_NAME") %>">View Chart Source Code</a>
</div>
<!-- ****** Here is the chart image ****** -->
<%= viewer.renderHTML() %>
</body>
</html>
[Windows Version (in Visual Basic)] vbdemo\rose.cls
Public Sub createChart(viewer As Object, chartIndex As Integer)
Dim cd As New ChartDirector.API
' Data for the chart
Dim data()
data = Array(9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6, 1.5, 2.2, _
5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5)
Dim angles()
angles = Array(0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, _
255, 270, 285, 300, 315, 330, 345)
' Create a PolarChart object of size 460 x 460 pixels, with a silver background and a 1 pixel 3D
' border
Dim c As PolarChart
Set c = cd.PolarChart(460, 460, cd.silverColor(), &H000000, 1)
' Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use white
' text on deep blue background.
Call c.addTitle("Polar Vector Chart Demonstration", "arialbi.ttf", 15, &Hffffff _
).setBackground(&H000080)
' Set plot area center at (230, 240) with radius 180 pixels and white background
Call c.setPlotArea(230, 240, 180, &Hffffff)
' Set the grid style to circular grid
Call c.setGridStyle(False)
' Set angular axis as 0 - 360, with a spoke every 30 units
Call c.angularAxis().setLinearScale(0, 360, 30)
' Add sectors to the chart as sector zones
Dim i As Long
For i = 0 To UBound(data)
Call c.angularAxis().addZone(angles(i), angles(i) + 15, 0, data(i), &H33ff33, &H008000)
Next
' Add an Transparent invisible layer to ensure the axis is auto-scaled using the data
Call c.addLineLayer(data, cd.Transparent)
' Output the chart
Set viewer.Picture = c.makePicture()
End Sub
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