Create Dial chart | jfree | dashboard gauges| meters

This is an alternative to the meter chart

 

The requirement is the same as meter chart, your SQL should return only one column and one row, just a single cell value

 

select count(transactions) as runs

from tbl_trans

 

 

When you first create the chart, it appears blank

 

You need to enable the javascript and set the appropriate dial ranges and options

 

import org.jfree.chart.JFreeChart;

import org.jfree.experimental.chart.plot.dial.DialPlot;

import org.jfree.experimental.chart.plot.dial.SimpleDialFrame;

import org.jfree.experimental.chart.plot.dial.DialTextAnnotation;

import org.jfree.experimental.chart.plot.dial.StandardDialRange;

import org.jfree.experimental.chart.plot.dial.StandardDialScale;

import org.jfree.experimental.chart.plot.dial.DialBackground;

import org.jfree.experimental.chart.plot.dial.DialCap;

import org.jfree.experimental.chart.plot.dial.DialPointer;

import org.jfree.experimental.chart.plot.dial.DialValueIndicator;

import org.jfree.data.general.DefaultValueDataset;

import org.jfree.ui.GradientPaintTransformType;

import org.jfree.ui.StandardGradientPaintTransformer;

DialPlot plot = (DialPlot)(chart.getPlot());

              SimpleDialFrame dialFrame = new SimpleDialFrame();

dialFrame.setBackgroundPaint(Color.lightGray);

              dialFrame.setForegroundPaint(Color.darkGray);

              plot.setDialFrame(dialFrame);

              GradientPaint gp = new GradientPaint(new Point(), new Color(255, 255, 255), new Point(), new Color(0,90, 0));

              DialBackground db = new DialBackground(gp);

              db.setGradientPaintTransformer(new StandardGradientPaintTransformer(GradientPaintTransformType.VERTICAL));

              plot.setBackground(db);

              DialTextAnnotation annotation1 = new DialTextAnnotation("Runs");

              annotation1.setFont(new Font("Dialog", Font.BOLD, 14));

              annotation1.setRadius(0.7);

              plot.addLayer(annotation1);

              DialValueIndicator dvi = new DialValueIndicator(0, " ");

              plot.addLayer(dvi);

 

/* set the dial range and the angle of the inside circle for e.g 0 through 120 is the range of the values

and the -120 is the starting angle and -300 is the ending angle in degrees.*/

                              StandardDialScale scale = new StandardDialScale(0, 120, -120, -300);

 

              scale.setTickRadius(0.88);

              scale.setTickLabelOffset(0.15);

              scale.setTickLabelFont(new Font("Dialog", Font.PLAIN, 14));

              plot.addScale(0, scale);

              StandardDialRange range = new StandardDialRange(0.0, 50.0, Color.green);

              range.setInnerRadius(0.52);

              range.setOuterRadius(0.58);

              plot.addLayer(range);

              StandardDialRange range2 = new StandardDialRange(50.0, 80.0, Color.blue);

              range2.setInnerRadius(0.52);

              range2.setOuterRadius(0.58);

              plot.addLayer(range2);

              StandardDialRange range3 = new StandardDialRange(80.0, 120.0, Color.red);

              range3.setInnerRadius(0.52);

              range3.setOuterRadius(0.58);

              plot.addLayer(range3);

              DialPointer needle = new DialPointer.Pointer();

              plot.addLayer(needle);

              DialCap cap = new DialCap();

              cap.setRadius(0.1);

              plot.setCap(cap);

      float h = displayFrame.getHeight();

      float w = displayFrame.getWidth();

                  // GradientPaint gradientPaint = new GradientPaint(0.0F, 10.0F, Color.WHITE, h, w, Color.green.darker());

                    //plot.setBackgroundPaint(gradientPaint);

                    chart.setBackgroundPaint(new GradientPaint(0,0,Color.blue,0,h, Color.cyan));