ChartDirector 7.0 (ASP/COM/VB Edition)

Square Angular Meters


      

This example demonstrates angular meters of which the pointers are pivoted at the corners of squares.

The meters in this example are achieved by using various start angles and end angles with 90 degrees angular span between them.

Source Code Listing

[Web Version (in ASP)] aspdemo\squareameter.asp
<%@ language="vbscript" %> <% Set cd = CreateObject("ChartDirector.API") ' This script can draw different charts depending on the chartIndex Sub createChart(viewer, chartIndex) ' The value to display on the meter value = 4.75 ' Create an AugularMeter object of size 110 x 110 pixels, using silver background color with a ' black 2 pixel 3D depressed border. Set m = cd.AngularMeter(110, 110, cd.silverColor(), &H000000, -2) ' Set meter appearance according to a parameter If chartIndex = 0 Then ' Set the meter center at bottom left corner (15, 95), with radius 85 pixels. Meter spans ' from 90 - 0 degrees. Call m.setMeter(15, 95, 85, 90, 0) ' Add a label to the meter centered at (35, 75) Call m.addText(35, 75, "VDC", "Arial Bold", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at top right corner (103, 7) Call m.addText(103, 7, m.formatValue(value, "2"), "Arial", 8, &Hffffff, cd.TopRight _ ).setBackground(0, 0, -1) ElseIf chartIndex = 1 Then ' Set the meter center at top left corner (15, 15), with radius 85 pixels. Meter spans from ' 90 - 180 degrees. Call m.setMeter(15, 15, 85, 90, 180) ' Add a label to the meter centered at (35, 35) Call m.addText(35, 35, "AMP", "Arial Bold", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at bottom right corner (103, 103) Call m.addText(103, 103, m.formatValue(value, "2"), "Arial", 8, &Hffffff, cd.BottomRight _ ).setBackground(0, 0, -1) ElseIf chartIndex = 2 Then ' Set the meter center at top right corner (15, 95), with radius 85 pixels. Meter spans from ' 270 - 180 degrees. Call m.setMeter(95, 15, 85, 270, 180) ' Add a label to the meter centered at (75, 35) Call m.addText(75, 35, "KW", "Arial Bold", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at bottom left corner (7, 103) Call m.addText(7, 103, m.formatValue(value, "2"), "Arial", 8, &Hffffff, cd.BottomLeft _ ).setBackground(0, 0, -1) Else ' Set the meter center at bottom right corner (95, 95), with radius 85 pixels. Meter spans ' from 270 - 360 degrees. Call m.setMeter(95, 95, 85, 270, 360) ' Add a label to the meter centered at (75, 75) Call m.addText(75, 75, "RPM", "Arial Bold", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at top left corner (7, 7) Call m.addText(7, 7, m.formatValue(value, "2"), "Arial", 8, &Hffffff, cd.TopLeft _ ).setBackground(0, 0, -1) End If ' Meter scale is 0 - 10, with a major tick every 2 units, and minor tick every 1 unit Call m.setScale(0, 10, 2, 1) ' Set 0 - 6 as green (99ff99) zone, 6 - 8 as yellow (ffff00) zone, and 8 - 10 as red (ff3333) ' zone Call m.addZone(0, 6, &H99ff99, &H808080) Call m.addZone(6, 8, &Hffff00, &H808080) Call m.addZone(8, 10, &Hff3333, &H808080) ' Add a semi-transparent black (80000000) pointer at the specified value Call m.addPointer(value, &H80000000) ' Output the chart Call viewer.setChart(m, cd.SVG) End Sub ' This example includes 4 charts Dim viewers(3) For i = 0 To Ubound(viewers) Set viewers(i) = cd.WebChartViewer(Request, "chart" & i) Call createChart(viewers(i), i) Next %> <!DOCTYPE html> <html> <head> <title>Square Angular Meters</title> <!-- Include ChartDirector Javascript Library to support chart interactions --> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <div style="font:bold 18pt verdana;"> Square Angular Meters </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.asp?file=<%= Request("SCRIPT_NAME") %>">View Chart Source Code</a> </div> <!-- ****** Here are the chart images ****** --> <% For i = 0 To Ubound(viewers) Call Response.Write(viewers(i).renderHTML()) Call Response.Write(" ") Next %> </body> </html>

[Windows Version (in Visual Basic)] vbdemo\squareameter.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 = 4.75 ' Create an AugularMeter object of size 110 x 110 pixels, using silver background color with a ' black 2 pixel 3D depressed border. Dim m As AngularMeter Set m = cd.AngularMeter(110, 110, cd.silverColor(), &H000000, -2) ' Set meter appearance according to a parameter If chartIndex = 0 Then ' Set the meter center at bottom left corner (15, 95), with radius 85 pixels. Meter spans ' from 90 - 0 degrees. Call m.setMeter(15, 95, 85, 90, 0) ' Add a label to the meter centered at (35, 75) Call m.addText(35, 75, "VDC", "arialbd.ttf", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at top right corner (103, 7) Call m.addText(103, 7, m.formatValue(value, "2"), "arial.ttf", 8, &Hffffff, cd.TopRight _ ).setBackground(0, 0, -1) ElseIf chartIndex = 1 Then ' Set the meter center at top left corner (15, 15), with radius 85 pixels. Meter spans from ' 90 - 180 degrees. Call m.setMeter(15, 15, 85, 90, 180) ' Add a label to the meter centered at (35, 35) Call m.addText(35, 35, "AMP", "arialbd.ttf", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at bottom right corner (103, 103) Call m.addText(103, 103, m.formatValue(value, "2"), "arial.ttf", 8, &Hffffff, _ cd.BottomRight).setBackground(0, 0, -1) ElseIf chartIndex = 2 Then ' Set the meter center at top right corner (15, 95), with radius 85 pixels. Meter spans from ' 270 - 180 degrees. Call m.setMeter(95, 15, 85, 270, 180) ' Add a label to the meter centered at (75, 35) Call m.addText(75, 35, "KW", "arialbd.ttf", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at bottom left corner (7, 103) Call m.addText(7, 103, m.formatValue(value, "2"), "arial.ttf", 8, &Hffffff, cd.BottomLeft _ ).setBackground(0, 0, -1) Else ' Set the meter center at bottom right corner (95, 95), with radius 85 pixels. Meter spans ' from 270 - 360 degrees. Call m.setMeter(95, 95, 85, 270, 360) ' Add a label to the meter centered at (75, 75) Call m.addText(75, 75, "RPM", "arialbd.ttf", 12, cd.TextColor, cd.Center) ' Add a text box to show the value at top left corner (7, 7) Call m.addText(7, 7, m.formatValue(value, "2"), "arial.ttf", 8, &Hffffff, cd.TopLeft _ ).setBackground(0, 0, -1) End If ' Meter scale is 0 - 10, with a major tick every 2 units, and minor tick every 1 unit Call m.setScale(0, 10, 2, 1) ' Set 0 - 6 as green (99ff99) zone, 6 - 8 as yellow (ffff00) zone, and 8 - 10 as red (ff3333) ' zone Call m.addZone(0, 6, &H99ff99, &H808080) Call m.addZone(6, 8, &Hffff00, &H808080) Call m.addZone(8, 10, &Hff3333, &H808080) ' Add a semi-transparent black (80000000) pointer at the specified value Call m.addPointer(value, &H80000000) ' Output the chart Set viewer.Picture = m.makePicture() End Sub