ChartDirector 7.0 (Java Edition)

Color Horizontal Linear Meters


          

This example demonstrates horizontal linear 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/colorhlinearmeter.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 = 74.25; // The background and border colors of the meters int[] bgColor = {0xbbddff, 0xccffcc, 0xffccff, 0xffffaa, 0xffdddd, 0xeeeeee}; int[] borderColor = {0x000088, 0x006600, 0x6600aa, 0xee6600, 0x880000, 0x666666}; // Create a LinearMeter object of size 250 x 75 pixels with a 3-pixel thick rounded frame LinearMeter m = new LinearMeter(250, 75, bgColor[chartIndex], borderColor[chartIndex]); m.setRoundedFrame(Chart.Transparent); m.setThickFrame(3); // Set the scale region top-left corner at (14, 23), with size of 218 x 20 pixels. The scale // labels are located on the top (implies horizontal meter) m.setMeter(14, 23, 218, 20, Chart.Top); // Set meter scale from 0 - 100, with a tick every 10 units m.setScale(0, 100, 10); // Demostrate different types of color scales and putting them at different positions double[] smoothColorScale = {0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000}; double[] stepColorScale = {0, 0x33ff33, 50, 0xffff33, 80, 0xff3333, 100}; double[] highLowColorScale = {0, 0x6666ff, 70, Chart.Transparent, 100, 0xff0000}; if (chartIndex == 0) { // Add the smooth color scale at the default position m.addColorScale(smoothColorScale); } else if (chartIndex == 1) { // Add the step color scale at the default position m.addColorScale(stepColorScale); } else if (chartIndex == 2) { // Add the high low scale at the default position m.addColorScale(highLowColorScale); } else if (chartIndex == 3) { // Add the smooth color scale starting at y = 23 (top of scale) with zero width and ending // at y = 23 with 20 pixels width m.addColorScale(smoothColorScale, 23, 0, 23, 20); } else if (chartIndex == 4) { // Add the smooth color scale starting at y = 33 (center of scale) with zero width and // ending at y = 23 with 20 pixels width m.addColorScale(smoothColorScale, 33, 0, 23, 20); } else { // Add the smooth color scale starting at y = 43 (bottom of scale) with zero width and // ending at y = 23 with 20 pixels width m.addColorScale(smoothColorScale, 43, 0, 23, 20); } // Add a blue (0x0000cc) pointer at the specified value m.addPointer(value, 0x0000cc); // Add a label left aligned to (10, 61) using 8pt Arial Bold font m.addText(10, 61, "Temperature C", "Arial Bold", 8, Chart.TextColor, Chart.Left); // Add a text box right aligned to (235, 61). Display the value using white (0xffffff) 8pt Arial // Bold font on a black (0x000000) background with depressed rounded border. TextBox t = m.addText(235, 61, m.formatValue(value, "2"), "Arial Bold", 8, 0xffffff, Chart.Right ); 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 Linear 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 Linear 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>