JMeter example source code file (AxisGraph.java)

This example JMeter source code file (AxisGraph.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, axischartdataset, axisgraph, axisgraph, axisproperties, chartproperties, chartproperties, dataaxisproperties, dataseries, gui, labelaxisproperties, legendproperties, math, propertyexception, string, string, swing

The JMeter AxisGraph.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.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LayoutManager;
import java.awt.Paint;
import java.math.BigDecimal;

import javax.swing.JPanel;

import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;
import org.jCharts.axisChart.AxisChart;
import org.jCharts.axisChart.customRenderers.axisValue.renderers.ValueLabelPosition;
import org.jCharts.axisChart.customRenderers.axisValue.renderers.ValueLabelRenderer;
import org.jCharts.chartData.AxisChartDataSet;
import org.jCharts.chartData.ChartDataException;
import org.jCharts.chartData.DataSeries;
import org.jCharts.properties.AxisProperties;
import org.jCharts.properties.BarChartProperties;
import org.jCharts.properties.ChartProperties;
import org.jCharts.properties.DataAxisProperties;
import org.jCharts.properties.LabelAxisProperties;
import org.jCharts.properties.LegendProperties;
import org.jCharts.properties.PropertyException;
import org.jCharts.types.ChartType;

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

    private static final long serialVersionUID = 240L;

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

    private static final String ELLIPSIS = "..."; //$NON-NLS-1$
    private static final int ELLIPSIS_LEN = ELLIPSIS.length();

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

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

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

    /**
     * @param layout
     * @param isDoubleBuffered
     */
    public AxisGraph(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 setMaxLength(int maxLength) {
        this.maxLength = maxLength;
    }

    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) {
        if (data != null && this.title != null && this.xAxisLabels != null &&
                this.xAxisTitle != null && this.yAxisLabel != null &&
                this.yAxisTitle != null) {
            drawSample(this.title,this.maxLength,this.xAxisLabels,this.xAxisTitle,
                this.yAxisTitle,this.data,this.width,this.height,g);
        }
    }

    private double findMax(double _data[][]) {
        double max = 0;
        max = _data[0][0];
        for (int i = 0; i < _data.length; i++) {
            for (int j = 0; j < _data[i].length; j++) {
                if (_data[i][j] > max) {
                    max = _data[i][j];
                }
            }
        }
        return max;
    }

    private String squeeze (String input, int _maxLength){
        if (input.length()>_maxLength){
            String output=input.substring(0,_maxLength-ELLIPSIS_LEN)+ELLIPSIS;
            return output;
        }
        return input;
    }

    private void drawSample(String _title, int _maxLength, String[] _xAxisLabels, String _xAxisTitle,
            String _yAxisTitle, double[][] _data, int _width, int _height, Graphics g) {
        double max = findMax(_data);
        try {
            /** These controls are already done in StatGraphVisualizer
            if (_width == 0) {
                _width = 450;
            }
            if (_height == 0) {
                _height = 250;
            }
            **/
            if (_maxLength < 3) {
                _maxLength = 3;
            }
            // if the "Title of Graph" is empty, we can assume some default
            if (_title.length() == 0 ) {
                _title = "Graph";
            }
            // if the labels are too long, they'll be "squeezed" to make the chart viewable.
            for (int i = 0; i < _xAxisLabels.length; i++) {
                String label = _xAxisLabels[i];
                _xAxisLabels[i]=squeeze(label, _maxLength);
            }
            this.setPreferredSize(new Dimension(_width,_height));
            DataSeries dataSeries = new DataSeries( _xAxisLabels, _xAxisTitle, _yAxisTitle, _title );

            String[] legendLabels= { yAxisLabel };
            Paint[] paints= new Paint[] { Color.yellow };
            BarChartProperties barChartProperties= new BarChartProperties();
            ValueLabelRenderer valueLabelRenderer = new ValueLabelRenderer(false, false, true, 0);
            valueLabelRenderer.setValueLabelPosition(ValueLabelPosition.AT_TOP);
            valueLabelRenderer.useVerticalLabels(true);
            barChartProperties.addPostRenderEventListener(valueLabelRenderer);
            AxisChartDataSet axisChartDataSet =
                new AxisChartDataSet(
                        _data, legendLabels, paints, ChartType.BAR, barChartProperties );
            dataSeries.addIAxisPlotDataSet( axisChartDataSet );

            ChartProperties chartProperties= new ChartProperties();
            LabelAxisProperties xaxis = new LabelAxisProperties();
            DataAxisProperties yaxis = new DataAxisProperties();

            try {
                BigDecimal round = new BigDecimal(max / 1000d);
                round = round.setScale(0, BigDecimal.ROUND_UP);
                double topValue = round.doubleValue() * 1000;
                yaxis.setUserDefinedScale(0, 500);
                yaxis.setNumItems((int) (topValue / 500)+1);
                yaxis.setShowGridLines(1);
            } catch (PropertyException e) {
                log.warn("",e);
            }

            AxisProperties axisProperties= new AxisProperties(xaxis, yaxis);
            axisProperties.setXAxisLabelsAreVertical(true);
            LegendProperties legendProperties= new LegendProperties();
            AxisChart axisChart = new AxisChart(
                    dataSeries, chartProperties, axisProperties,
                    legendProperties, _width, _height );
            axisChart.setGraphics2D((Graphics2D) g);
            axisChart.render();
        } catch (ChartDataException e) {
            log.warn("",e);
        } catch (PropertyException e) {
            log.warn("",e);
        }
    }

}