BarChart11.java

/**
 * Copyright 2015-2017 Knowm Inc. (http://knowm.org) and contributors.
 * Copyright 2011-2015 Xeiam LLC (http://xeiam.com) and contributors.
 *
 * Licensed 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.knowm.xchart.demo.charts.bar;

import java.awt.Color;
import java.util.Random;

import org.knowm.xchart.CategoryChart;
import org.knowm.xchart.CategoryChartBuilder;
import org.knowm.xchart.CategorySeries;
import org.knowm.xchart.CategorySeries.CategorySeriesRenderStyle;
import org.knowm.xchart.SwingWrapper;
import org.knowm.xchart.demo.charts.ExampleChart;

/**
 * Stacked Bar Chart
 * <p>
 * Demonstrates the following:
 * <ul>
 * <li>int categories as array
 * <li>Positive and negative values
 * <li>Single series
 * <li>Render style - Stacked stepped bars
 */
public class BarChart11 implements ExampleChart<CategoryChart> {

  public static void main(String[] args) {

    ExampleChart<CategoryChart> exampleChart = new BarChart11();
    CategoryChart chart = exampleChart.getChart();
    new SwingWrapper<CategoryChart>(chart).displayChart();
  }

  private static int[] getRandomValues(int startRange, int endRange, int count) {

    int[] values = new int[count];
    Random rand = new Random();
    for (int i = 0; i < count; i++) {
      values[i] = rand.nextInt(endRange - startRange) + startRange;
    }
    return values;
  }

  private static int[] getLinearValues(int startRange, int endRange, int count) {

    int[] values = new int[count];
    int step = (endRange - startRange) / count;
    for (int i = 0; i < count; i++) {
      values[i] = step * i;
    }
    return values;
  }

  @Override
  public CategoryChart getChart() {

    // Create Chart
    CategoryChart chart = new CategoryChartBuilder().width(800).height(600).title("Tumbler Speed  vs. Average Spin").xAxisTitle("Speed").yAxisTitle("Spin").build();

    // Customize Chart
    chart.getStyler().setPlotGridVerticalLinesVisible(false);
    chart.getStyler().setStacked(true);

    // Series
    CategorySeries series1 = chart.addSeries("Cats", getLinearValues(0, 200, 21), getRandomValues(-50, 50, 21));
    CategorySeries series2 = chart.addSeries("Hamsters", getLinearValues(0, 200, 21), getRandomValues(-50, 50, 21));

    //Set render style to SteppedBar
    series1.setChartCategorySeriesRenderStyle(CategorySeriesRenderStyle.SteppedBar);
    series2.setChartCategorySeriesRenderStyle(CategorySeriesRenderStyle.SteppedBar);

    //Make the line of series1 transparent
    series1.setLineColor(new Color(0, 0, 0, 0));

    //Make the fill of series 2 transparent
    series2.setFillColor(new Color(0, 0, 0, 0));

    return chart;
  }
}