ChartDirector 6.0 (ASP/COM/VB Edition)

Round Meter




This example demonstrates the basic steps in creating a round meter.

A round meter can be created with the following steps:

Source Code Listing

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

' The value to display on the meter
value = 72.3

' Create an AngularMeter object of size 250 x 250 pixels with transparent background
Set m = cd.AngularMeter(250, 250, cd.Transparent)

' Center at (125, 125), scale radius = 111 pixels, scale angle -145 to +145 degrees
Call m.setMeter(125, 125, 111, -145, 145)

' Add a very light grey (0xeeeeee) circle with radius 123 pixels as background
Call m.addRing(0, 123, &Heeeeee)
' Add a grey (0xcccccc) ring between radii 116 and 123 pixels as border
Call m.addRing(116, 123, &Hcccccc)

' Meter scale is 0 - 100, with major/minor/micro ticks every 10/5/1 units
Call m.setScale(0, 100, 10, 5, 1)

' Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to 12/9/6
' pixels pointing inwards, and their widths to 2/1/1 pixels.
Call m.setLabelStyle("ariali.ttf", 15)
Call m.setTickLength(-12, -9, -6)
Call m.setLineWidth(0, 2, 1, 1)

' Add a smooth color scale to the meter
smoothColorScale = Array(0, &H3333ff, 25, &H0088ff, 50, &H00ff00, 75, &Hdddd00, 100, &Hff0000)
Call m.addColorScale(smoothColorScale)

' Add a text label centered at (125, 175) with 15pt Arial Italic font
Call m.addText(125, 175, "CPU", "ariali.ttf", 15, cd.TextColor, cd.Center)

' Add a red (0xff0000) pointer at the specified value
Call m.addPointer2(value, &Hff0000)

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

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

    Dim cd As New ChartDirector.API

    ' The value to display on the meter
    Dim value As Double
    value = 72.3

    ' Create an AngularMeter object of size 250 x 250 pixels
    Dim m As AngularMeter
    Set m = cd.AngularMeter(250, 250)

    ' Center at (125, 125), scale radius = 111 pixels, scale angle -145 to +145 degrees
    Call m.setMeter(125, 125, 111, -145, 145)

    ' Add a very light grey (0xeeeeee) circle with radius 123 pixels as background
    Call m.addRing(0, 123, &Heeeeee)
    ' Add a grey (0xcccccc) ring between radii 116 and 123 pixels as border
    Call m.addRing(116, 123, &Hcccccc)

    ' Meter scale is 0 - 100, with major/minor/micro ticks every 10/5/1 units
    Call m.setScale(0, 100, 10, 5, 1)

    ' Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    ' 12/9/6 pixels pointing inwards, and their widths to 2/1/1 pixels.
    Call m.setLabelStyle("ariali.ttf", 15)
    Call m.setTickLength(-12, -9, -6)
    Call m.setLineWidth(0, 2, 1, 1)

    ' Add a smooth color scale to the meter
    Dim smoothColorScale()
    smoothColorScale = Array(0, &H3333ff, 25, &H0088ff, 50, &H00ff00, 75, &Hdddd00, 100, &Hff0000)
    Call m.addColorScale(smoothColorScale)

    ' Add a text label centered at (125, 175) with 15pt Arial Italic font
    Call m.addText(125, 175, "CPU", "ariali.ttf", 15, cd.TextColor, cd.Center)

    ' Add a red (0xff0000) pointer at the specified value
    Call m.addPointer2(value, &Hff0000)

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

End Sub