JMeter example source code file (LineGraph.java)

This example JMeter source code file (LineGraph.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

awt, axischart, axisproperties, chartproperties, dataseries, gui, legendproperties, linegraph, paint, paint, shape, shape, string, string, stroke, stroke, swing

The JMeter LineGraph.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 */
package org.apache.jmeter.visualizers;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LayoutManager;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;

import javax.swing.JPanel;

import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;
import org.jCharts.axisChart.AxisChart;
import org.jCharts.chartData.AxisChartDataSet;
import org.jCharts.chartData.DataSeries;
import org.jCharts.properties.AxisProperties;
import org.jCharts.properties.ChartProperties;
import org.jCharts.properties.DataAxisProperties;
import org.jCharts.properties.LegendProperties;
import org.jCharts.properties.LineChartProperties;
import org.jCharts.properties.PointChartProperties;
import org.jCharts.types.ChartType;

/**
 *
 * Axis graph is used by StatGraphVisualizer, which generates bar graphs
 * from the statistical data.
 */
public class LineGraph extends JPanel {

    private static final long serialVersionUID = 240L;

    private static final Logger log = LoggingManager.getLoggerForClass();

    protected double[][] data = null;
    protected String title, xAxisTitle, yAxisTitle;
    protected String[] xAxisLabels, yAxisLabel;
    protected int width, height;

    private static final Shape[] SHAPE_ARRAY = {PointChartProperties.SHAPE_CIRCLE,
            PointChartProperties.SHAPE_DIAMOND,PointChartProperties.SHAPE_SQUARE,
            PointChartProperties.SHAPE_TRIANGLE};

    /**
     * 12 basic colors for line graphs. If we need more colors than this,
     * we can add more. Though more than 12 lines per graph will look
     * rather busy and be hard to read.
     */
    private static final Paint[] PAINT_ARRAY = {Color.black,
            Color.blue,Color.green,Color.magenta,Color.orange,
            Color.red,Color.yellow,Color.darkGray,Color.gray,Color.lightGray,
            Color.pink,Color.cyan};
    protected int shape_counter = 0;
    protected int paint_counter = -1;

    /**
     *
     */
    public LineGraph() {
        super();
    }

    /**
     * @param layout
     */
    public LineGraph(LayoutManager layout) {
        super(layout);
    }

    /**
     * @param layout
     * @param isDoubleBuffered
     */
    public LineGraph(LayoutManager layout, boolean isDoubleBuffered) {
        super(layout, isDoubleBuffered);
    }

    public void setData(double[][] data) {
        this.data = data;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setXAxisTitle(String title) {
        this.xAxisTitle = title;
    }

    public void setYAxisTitle(String title) {
        this.yAxisTitle = title;
    }

    public void setXAxisLabels(String[] labels) {
        this.xAxisLabels = labels;
    }

    public void setYAxisLabels(String[] label) {
        this.yAxisLabel = label;
    }

    public void setWidth(int w) {
        this.width = w;
    }

    public void setHeight(int h) {
        this.height = h;
    }

    @Override
    public void paintComponent(Graphics g) {
        // reset the paint counter
        this.paint_counter = -1;
        if (data != null && this.title != null && this.xAxisLabels != null &&
                this.xAxisTitle != null && this.yAxisLabel != null &&
                this.yAxisTitle != null) {
            drawSample(this.title,this.xAxisLabels,this.xAxisTitle,
                    this.yAxisTitle,this.data,this.width,this.height,g);
        }
    }

    private void drawSample(String _title, String[] _xAxisLabels, String _xAxisTitle,
            String _yAxisTitle, double[][] _data, int _width, int _height, Graphics g) {
        try {
            if (_width == 0) {
                _width = 450;
            }
            if (_height == 0) {
                _height = 250;
            }
            this.setPreferredSize(new Dimension(_width,_height));
            DataSeries dataSeries = new DataSeries( _xAxisLabels, _xAxisTitle, _yAxisTitle, _title );
            String[] legendLabels= yAxisLabel;
            Paint[] paints = this.createPaint(_data.length);
            Shape[] shapes = createShapes(_data.length);
            Stroke[] lstrokes = createStrokes(_data.length);
            LineChartProperties lineChartProperties= new LineChartProperties(lstrokes,shapes);
            AxisChartDataSet axisChartDataSet= new AxisChartDataSet( _data,
                    legendLabels,
                    paints,
                    ChartType.LINE,
                    lineChartProperties );
            dataSeries.addIAxisPlotDataSet( axisChartDataSet );

            ChartProperties chartProperties = new ChartProperties();
            AxisProperties axisProperties = new AxisProperties();
            // show the grid lines, to turn it off, set it to zero
            axisProperties.getYAxisProperties().setShowGridLines(1);
            axisProperties.setXAxisLabelsAreVertical(true);
            // set the Y Axis to round
            DataAxisProperties daxp = (DataAxisProperties)axisProperties.getYAxisProperties();
            daxp.setRoundToNearest(1);
            LegendProperties legendProperties = new LegendProperties();
            AxisChart axisChart = new AxisChart(
                    dataSeries, chartProperties, axisProperties,
                    legendProperties, _width, _height );
            axisChart.setGraphics2D((Graphics2D) g);
            axisChart.render();
        } catch (Exception e) {
            log.error(e.getMessage());
        }
    }

    /**
     * Since we only have 4 shapes, the method will start with the
     * first shape and keep cycling through the shapes in order.
     * @param count
     * @return the first n shapes
     */
    public Shape[] createShapes(int count) {
        Shape[] shapes = new Shape[count];
        for (int idx=0; idx < count; idx++) {
            shapes[idx] = nextShape();
        }
        return shapes;
    }

    /**
     * Return the next shape
     * @return the next shape
     */
    public Shape nextShape() {
        this.shape_counter++;
        if (shape_counter >= (SHAPE_ARRAY.length - 1)) {
            shape_counter = 0;
        }
        return SHAPE_ARRAY[shape_counter];
    }

    /**
     *
     * @param count
     * @return the first count strokes
     */
    public Stroke[] createStrokes(int count) {
        Stroke[] str = new Stroke[count];
        for (int idx=0; idx < count; idx++) {
            str[idx] = nextStroke();
        }
        return str;
    }

    /**
     * method always return a new BasicStroke with 1.0f weight
     * @return a new BasicStroke with 1.0f weight
     */
    public Stroke nextStroke() {
        return new BasicStroke(1.0f);
    }

    /**
     * return an array of Paint with different colors. The current
     * implementation will cycle through 12 colors if a line graph
     * has more than 12 entries
     * @param count
     * @return an array of Paint with different colors
     */
    public Paint[] createPaint(int count) {
        Paint[] pts = new Paint[count];
        for (int idx=0; idx < count; idx++) {
            pts[idx] = nextPaint();
        }
        return pts;
    }

    /**
     * The method will return the next paint color in the PAINT_ARRAY.
     * Rather than return a random color, we want it to always go through
     * the same sequence. This way, the same charts will always use the
     * same color and make it easier to compare side by side.
     * @return the next paint color in the PAINT_ARRAY
     */
    public Paint nextPaint() {
        this.paint_counter++;
        if (this.paint_counter == (PAINT_ARRAY.length - 1)) {
            this.paint_counter = 0;
        }
        return PAINT_ARRAY[this.paint_counter];
    }
}