ChartDirector 7.0 (Java Edition)

Color Horizontal Bar Meters


          

This example demonstrates horizontal bar meters in various colors, with different color scales, and with title and value readout.

BaseMeter.addColorScale is used to create the color scales in the meters. The color scales are created by with different colors, different end point positions and different widths at the end points.

The title and value readout are created using BaseChart.addText. The value readout is configured to have a black background and a depressed border using Box.setBackground, and with rounded corners using Box.setRoundedCorners.

Source Code Listing

[JSP Version] jspdemo/colorhbarmeter.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 = 75.35; // The background, border and bar colors of the meters int[] bgColor = {0xbbddff, 0xccffcc, 0xffddff, 0xffffaa, 0xffdddd, 0xeeeeee}; int[] borderColor = {0x000088, 0x006600, 0x880088, 0xee6600, 0x880000, 0x666666}; int[] barColor = {0x0088ff, 0x00cc00, 0x8833dd, 0xff8800, 0xee3333, 0x888888}; // Create a LinearMeter object of size 260 x 80 pixels with a 3-pixel thick rounded frame LinearMeter m = new LinearMeter(260, 80, bgColor[chartIndex], borderColor[chartIndex]); m.setRoundedFrame(Chart.Transparent); m.setThickFrame(3); // Set the scale region top-left corner at (18, 24), with size of 222 x 20 pixels. The scale // labels are located on the top (implies horizontal meter) m.setMeter(18, 24, 222, 20, Chart.Top); // Set meter scale from 0 - 100, with a tick every 10 units m.setScale(0, 100, 10); if (chartIndex % 4 == 0) { // Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale) double[] smoothColorScale = {0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000}; m.addColorScale(smoothColorScale, 48, 5); } else if (chartIndex % 4 == 1) { // Add a 5-pixel thick step color scale at y = 48 (below the meter scale) double[] stepColorScale = {0, 0x00cc00, 50, 0xffdd00, 80, 0xff3333, 100}; m.addColorScale(stepColorScale, 48, 5); } else if (chartIndex % 4 == 2) { // Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale) double[] highLowColorScale = {0, 0x0000ff, 40, Chart.Transparent, 60, Chart.Transparent, 100, 0xff0000}; m.addColorScale(highLowColorScale, 48, 5); } else { // Add a 5-pixel thick high only color scale at y = 48 (below the meter scale) double[] highColorScale = {70, Chart.Transparent, 100, 0xff0000}; m.addColorScale(highColorScale, 48, 0, 48, 8); } // Add a bar from 0 to value with glass effect and 4 pixel rounded corners m.addBar(0, value, barColor[chartIndex], Chart.glassEffect(Chart.NormalGlare, Chart.Top), 4); // Add a label right aligned to (243, 65) using 8pt Arial Bold font m.addText(243, 65, "Temperature C", "Arial Bold", 8, Chart.TextColor, Chart.Right); // Add a text box left aligned to (18, 65). Display the value using white (0xffffff) 8pt Arial // Bold font on a black (0x000000) background with depressed rounded border. TextBox t = m.addText(18, 65, m.formatValue(value, "2"), "Arial", 8, 0xffffff, Chart.Left); t.setBackground(0x000000, 0x000000, -1); t.setRoundedCorners(3); // Output the chart viewer.setChart(m, Chart.SVG); } %> <% // This example includes 6 charts WebChartViewer[] viewers = new WebChartViewer[6]; for (int i = 0; i < viewers.length; ++i) { viewers[i] = new WebChartViewer(request, "chart" + i); createChart(viewers[i], i); } %> <!DOCTYPE html> <html> <head> <title>Color Horizontal Bar 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;"> Color Horizontal Bar 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>