ChartDirector 7.0 (Java 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

[JSP Version] jspdemo/squareameter.jsp
<%@page import="ChartDirector.*, java.util.*" %> <%! // Function to create the demo charts void createChart(WebChartViewer viewer, int chartIndex) { // The value to display on the meter 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. AngularMeter m = new AngularMeter(110, 110, Chart.silverColor(), 0x000000, -2); // Set meter appearance according to a parameter if (chartIndex == 0) { // Set the meter center at bottom left corner (15, 95), with radius 85 pixels. Meter spans // from 90 - 0 degrees. m.setMeter(15, 95, 85, 90, 0); // Add a label to the meter centered at (35, 75) m.addText(35, 75, "VDC", "Arial Bold", 12, Chart.TextColor, Chart.Center); // Add a text box to show the value at top right corner (103, 7) m.addText(103, 7, m.formatValue(value, "2"), "Arial", 8, 0xffffff, Chart.TopRight ).setBackground(0, 0, -1); } else if (chartIndex == 1) { // Set the meter center at top left corner (15, 15), with radius 85 pixels. Meter spans from // 90 - 180 degrees. m.setMeter(15, 15, 85, 90, 180); // Add a label to the meter centered at (35, 35) m.addText(35, 35, "AMP", "Arial Bold", 12, Chart.TextColor, Chart.Center); // Add a text box to show the value at bottom right corner (103, 103) m.addText(103, 103, m.formatValue(value, "2"), "Arial", 8, 0xffffff, Chart.BottomRight ).setBackground(0, 0, -1); } else if (chartIndex == 2) { // Set the meter center at top right corner (15, 95), with radius 85 pixels. Meter spans // from 270 - 180 degrees. m.setMeter(95, 15, 85, 270, 180); // Add a label to the meter centered at (75, 35) m.addText(75, 35, "KW", "Arial Bold", 12, Chart.TextColor, Chart.Center); // Add a text box to show the value at bottom left corner (7, 103) m.addText(7, 103, m.formatValue(value, "2"), "Arial", 8, 0xffffff, Chart.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. m.setMeter(95, 95, 85, 270, 360); // Add a label to the meter centered at (75, 75) m.addText(75, 75, "RPM", "Arial Bold", 12, Chart.TextColor, Chart.Center); // Add a text box to show the value at top left corner (7, 7) m.addText(7, 7, m.formatValue(value, "2"), "Arial", 8, 0xffffff, Chart.TopLeft ).setBackground(0, 0, -1); } // Meter scale is 0 - 10, with a major tick every 2 units, and minor tick every 1 unit 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 m.addZone(0, 6, 0x99ff99, 0x808080); m.addZone(6, 8, 0xffff00, 0x808080); m.addZone(8, 10, 0xff3333, 0x808080); // Add a semi-transparent black (80000000) pointer at the specified value m.addPointer(value, 0x80000000); // Output the chart viewer.setChart(m, Chart.SVG); } %> <% // This example includes 4 charts WebChartViewer[] viewers = new WebChartViewer[4]; for (int i = 0; i < viewers.length; ++i) { viewers[i] = new WebChartViewer(request, "chart" + i); createChart(viewers[i], i); } %> <!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.jsp?file=<%=request.getServletPath()%>">View Source Code</a> </div> <!-- ****** Here are the chart images ****** --> <% for (int i = 0; i < viewers.length; ++i) { out.write(viewers[i].renderHTML(response)); out.write(" "); } %> </body> </html>