ChartDirector 6.0 (ASP/COM/VB Edition)

Donut Width


        

This example demonstrates the effects of different donut widths.

Donut widths are configured by using different inner and outer radii when calling PieChart.setDonutSize.

Source Code Listing

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

' This script can draw different charts depending on the chartIndex
chartIndex = CInt(Request("img"))

' Determine the donut inner radius (as percentage of outer radius) based on input parameter
donutRadius = chartIndex * 25

' The data for the pie chart
data = Array(10, 10, 10, 10, 10)

' The labels for the pie chart
labels = Array("Marble", "Wood", "Granite", "Plastic", "Metal")

' Create a PieChart object of size 150 x 120 pixels, with a grey (EEEEEE) background, black border
' and 1 pixel 3D border effect
Set c = cd.PieChart(150, 120, &Heeeeee, &H000000, 1)

' Set donut center at (75, 65) and the outer radius to 50 pixels. Inner radius is computed according
' donutWidth
Call c.setDonutSize(75, 60, 50, Int(50 * donutRadius / 100))

' Add a title to show the donut width
Call c.addTitle("Inner Radius = " & donutRadius & " %", "arial.ttf", 10).setBackground(&Hcccccc, 0)

' Draw the pie in 3D
Call c.set3D(12)

' Set the pie data and the pie labels
Call c.setData(data, labels)

' Disable the sector labels by setting the color to Transparent
Call c.setLabelStyle("", 8, cd.Transparent)

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

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

    Dim cd As New ChartDirector.API

    ' Determine the donut inner radius (as percentage of outer radius) based on input parameter
    Dim donutRadius As Long
    donutRadius = chartIndex * 25

    ' The data for the pie chart
    Dim data()
    data = Array(10, 10, 10, 10, 10)

    ' The labels for the pie chart
    Dim labels()
    labels = Array("Marble", "Wood", "Granite", "Plastic", "Metal")

    ' Create a PieChart object of size 150 x 120 pixels, with a grey (EEEEEE) background, black
    ' border and 1 pixel 3D border effect
    Dim c As PieChart
    Set c = cd.PieChart(150, 120, &Heeeeee, &H000000, 1)

    ' Set donut center at (75, 65) and the outer radius to 50 pixels. Inner radius is computed
    ' according donutWidth
    Call c.setDonutSize(75, 60, 50, Int(50 * donutRadius / 100))

    ' Add a title to show the donut width
    Call c.addTitle("Inner Radius = " & donutRadius & " %", "arial.ttf", 10).setBackground( _
        &Hcccccc, 0)

    ' Draw the pie in 3D
    Call c.set3D(12)

    ' Set the pie data and the pie labels
    Call c.setData(data, labels)

    ' Disable the sector labels by setting the color to Transparent
    Call c.setLabelStyle("", 8, cd.Transparent)

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

    'include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("clickable", "", "title='{label}: {value}kg ({percent}%)'")

End Sub