ChartDirector 6.0 (ASP/COM/VB Edition)

3D Shadow Mode


      

This example demonstrates an alternative 3D drawing method that uses shadows.

The standard way to draw a pie chart in 3D is to view the chart from an inclined angle. Using this method, the surface of a 3D pie will become an ellipse.

ChartDirector supports an alternative way to draw a pie chart in 3D - to draw the 3D portion like a shadow. The 3D pie will remain perfectly circular, and the sector areas will correctly reflect its percentages.

The 3D drawing method is configured using PieChart.set3D.

Source Code Listing

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

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

' the tilt angle of the pie
angle = chartIndex * 90 + 45

' The data for the pie chart
data = Array(25, 18, 15, 12, 8, 30, 35)

' Create a PieChart object of size 110 x 110 pixels
Set c = cd.PieChart(110, 110)

' Set the center of the pie at (50, 55) and the radius to 36 pixels
Call c.setPieSize(55, 55, 36)

' Set the depth, tilt angle and 3D mode of the 3D pie (-1 means auto depth, "true" means the 3D
' effect is in shadow mode)
Call c.set3D(-1, angle, True)

' Add a title showing the shadow angle
Call c.addTitle("Shadow @ " & angle & " deg", "arial.ttf", 8)

' Set the pie data
Call c.setData(data)

' 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\shadowpie.cls
Public Sub createChart(viewer As Object, chartIndex As Integer)

    Dim cd As New ChartDirector.API

    ' the tilt angle of the pie
    Dim angle As Long
    angle = chartIndex * 90 + 45

    ' The data for the pie chart
    Dim data()
    data = Array(25, 18, 15, 12, 8, 30, 35)

    ' The labels for the pie chart
    Dim labels()
    labels = Array("Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities", "Production")

    ' Create a PieChart object of size 110 x 110 pixels
    Dim c As PieChart
    Set c = cd.PieChart(110, 110)

    ' Set the center of the pie at (50, 55) and the radius to 36 pixels
    Call c.setPieSize(55, 55, 36)

    ' Set the depth, tilt angle and 3D mode of the 3D pie (-1 means auto depth, "true" means the 3D
    ' effect is in shadow mode)
    Call c.set3D(-1, angle, True)

    ' Add a title showing the shadow angle
    Call c.addTitle("Shadow @ " & angle & " deg", "arial.ttf", 8)

    ' Set the pie data
    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}: US${value}K ({percent}%)'")

End Sub