ChartDirector 6.0 (ASP/COM/VB Edition)

Glass Multi-Bar Chart




This example demonstrates a multi-bar chart with glass shading effect for bars and gradient color for plot area background.

Glass lighting is a complex shading effect that gives a look and feel of tinted glass or semi-transparent plastic material. This effect involves glare and variation of lighting caused by reflection and refraction inside the material.

Source Code Listing

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

' The data for the bar chart
data0 = Array(100, 125, 245, 147, 67)
data1 = Array(85, 156, 179, 211, 123)
data2 = Array(97, 87, 56, 267, 157)
labels = Array("Mon", "Tue", "Wed", "Thur", "Fri")

' Create a XYChart object of size 540 x 375 pixels
Set c = cd.XYChart(540, 375)

' Add a title to the chart using 18pt Times Bold Italic font
Call c.addTitle("Average Weekly Network Load", "timesbi.ttf", 18)

' Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color from
' light blue (f9f9ff) to blue (6666ff) as background. Set border and grid lines to white (ffffff).
Call c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, &Hf9f9ff, &H6666ff), -1, _
    &Hffffff, &Hffffff)

' Add a legend box at (50, 28) using horizontal layout. Use 10pt Arial Bold as font, with
' transparent background.
Call c.addLegend(50, 28, False, "arialbd.ttf", 10).setBackground(cd.Transparent)

' Set the x axis labels
Call c.xAxis().setLabels(labels)

' Draw the ticks between label positions (instead of at label positions)
Call c.xAxis().setTickOffset(0.5)

' Set axis label style to 8pt Arial Bold
Call c.xAxis().setLabelStyle("arialbd.ttf", 8)
Call c.yAxis().setLabelStyle("arialbd.ttf", 8)

' Set axis line width to 2 pixels
Call c.xAxis().setWidth(2)
Call c.yAxis().setWidth(2)

' Add axis title
Call c.yAxis().setTitle("Throughput (MBytes Per Hour)")

' Add a multi-bar layer with 3 data sets
Set layer = c.addBarLayer2(cd.Side)
Call layer.addDataSet(data0, &Hff0000, "Server #1")
Call layer.addDataSet(data1, &H00ff00, "Server #2")
Call layer.addDataSet(data2, &Hff8800, "Server #3")

' Set bar border to transparent. Use glass lighting effect with light direction from left.
Call layer.setBorderColor(cd.Transparent, cd.glassEffect(cd.NormalGlare, cd.Left))

' Configure the bars within a group to touch each others (no gap)
Call layer.setBarGap(0.2, cd.TouchBar)

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

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

    Dim cd As New ChartDirector.API

    ' The data for the bar chart
    Dim data0()
    data0 = Array(100, 125, 245, 147, 67)
    Dim data1()
    data1 = Array(85, 156, 179, 211, 123)
    Dim data2()
    data2 = Array(97, 87, 56, 267, 157)
    Dim labels()
    labels = Array("Mon", "Tue", "Wed", "Thur", "Fri")

    ' Create a XYChart object of size 540 x 375 pixels
    Dim c As XYChart
    Set c = cd.XYChart(540, 375)

    ' Add a title to the chart using 18pt Times Bold Italic font
    Call c.addTitle("Average Weekly Network Load", "timesbi.ttf", 18)

    ' Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color
    ' from light blue (f9f9ff) to blue (6666ff) as background. Set border and grid lines to white
    ' (ffffff).
    Call c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, &Hf9f9ff, &H6666ff), _
        -1, &Hffffff, &Hffffff)

    ' Add a legend box at (50, 28) using horizontal layout. Use 10pt Arial Bold as font, with
    ' transparent background.
    Call c.addLegend(50, 28, False, "arialbd.ttf", 10).setBackground(cd.Transparent)

    ' Set the x axis labels
    Call c.xAxis().setLabels(labels)

    ' Draw the ticks between label positions (instead of at label positions)
    Call c.xAxis().setTickOffset(0.5)

    ' Set axis label style to 8pt Arial Bold
    Call c.xAxis().setLabelStyle("arialbd.ttf", 8)
    Call c.yAxis().setLabelStyle("arialbd.ttf", 8)

    ' Set axis line width to 2 pixels
    Call c.xAxis().setWidth(2)
    Call c.yAxis().setWidth(2)

    ' Add axis title
    Call c.yAxis().setTitle("Throughput (MBytes Per Hour)")

    ' Add a multi-bar layer with 3 data sets
    Dim layer As BarLayer
    Set layer = c.addBarLayer2(cd.Side)
    Call layer.addDataSet(data0, &Hff0000, "Server #1")
    Call layer.addDataSet(data1, &H00ff00, "Server #2")
    Call layer.addDataSet(data2, &Hff8800, "Server #3")

    ' Set bar border to transparent. Use glass lighting effect with light direction from left.
    Call layer.setBorderColor(cd.Transparent, cd.glassEffect(cd.NormalGlare, cd.Left))

    ' Configure the bars within a group to touch each others (no gap)
    Call layer.setBarGap(0.2, cd.TouchBar)

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

    'include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("clickable", "", _
        "title='{dataSetName} on {xLabel}: {value} MBytes/hour'")

End Sub