ChartDirector 6.0 (ASP/COM/VB Edition)

Soft Bar Shading




This example demonstrates using soft lighting effect for bars and gradient color for plot area background. It also demonstrates putting axis ticks in between axis labels, as opposed to at the axis labels.

Soft lighting is a special shading effect that look like gradient coloring. In this example, soft lighting effect is applied to the bars with the light coming from the left direction.

See Soft Multi-Bar Chart for another example of soft lighting effect with the light coming from the top direction.

Source Code Listing

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

' The data for the bar chart
data = Array(450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700)

' The labels for the bar chart
labels = Array("1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005")

' Create a XYChart object of size 600 x 360 pixels
Set c = cd.XYChart(600, 360)

' Add a title to the chart using 18pt Times Bold Italic font
Call c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)

' Set the plotarea at (60, 40) and of size 500 x 280 pixels. Use a vertical gradient color from
' light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines to white
' (ffffff).
Call c.setPlotArea(60, 40, 500, 280, c.linearGradientColor(60, 40, 60, 280, &Heeeeff, &H0000cc), _
    -1, &Hffffff, &Hffffff)

' Add a multi-color bar chart layer using the supplied data. Use soft lighting effect with light
' direction from left.
Call c.addBarLayer3(data).setBorderColor(cd.Transparent, cd.softLighting(cd.Left))

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

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

' Add a title to the y axis with 10pt Arial Bold font
Call c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)

' 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)

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

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

    Dim cd As New ChartDirector.API

    ' The data for the bar chart
    Dim data()
    data = Array(450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700)

    ' The labels for the bar chart
    Dim labels()
    labels = Array("1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005")

    ' Create a XYChart object of size 600 x 360 pixels
    Dim c As XYChart
    Set c = cd.XYChart(600, 360)

    ' Add a title to the chart using 18pt Times Bold Italic font
    Call c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)

    ' Set the plotarea at (60, 40) and of size 500 x 280 pixels. Use a vertical gradient color from
    ' light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines to white
    ' (ffffff).
    Call c.setPlotArea(60, 40, 500, 280, c.linearGradientColor(60, 40, 60, 280, &Heeeeff, &H0000cc _
        ), -1, &Hffffff, &Hffffff)

    ' Add a multi-color bar chart layer using the supplied data. Use soft lighting effect with light
    ' direction from left.
    Call c.addBarLayer3(data).setBorderColor(cd.Transparent, cd.softLighting(cd.Left))

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

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

    ' Add a title to the y axis with 10pt Arial Bold font
    Call c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)

    ' 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)

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

    'include tool tip for the chart
    viewer.ImageMap = c.getHTMLImageMap("clickable", "", "title='Year {xLabel}: US$ {value}M'")

End Sub