Example_17

A line chart: a Chart with a Series for each line, drawn with setDrawPath, of the electric vehicles of the data file by model year and by kind.
Example_17.pdf — the PDF this example creates.
package examples;

import java.io.*;
import com.pdfjet.*;
import com.pdfjet.fonts.*;

/**
 * Example_17.java
 *
 * Draws a line chart of two series over the same years: a Chart with a Series
 * for each line, drawn with setDrawPath so the points are joined, and the
 * markers left visible so each year can be read off the line.
 */
public class Example_17 {
    // The vehicles of data/Electric_Vehicle_Population_Data.csv by model year
    // and kind, which Example_43 draws as a table: the rows of the file whose
    // "Electric Vehicle Type" begins with "Battery Electric" and with
    // "Plug-in Hybrid", counted by the "Model Year" column. The file holds
    // 124,716 rows, of which 124,419 are registered in Washington State, and
    // model years from 1997; the years before 2011 are a few dozen vehicles
    // in all and are left out here.
    private static final int[] YEARS =
            {2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023};
    private static final int[] BATTERY =
            { 753,  798, 2936, 1805, 3612, 3891, 4458, 9946, 8576, 9315, 14755, 23507, 11853};
    private static final int[] HYBRID =
            {  75,  870, 1645, 1804, 1323, 1811, 4100, 4278, 1874, 1611,  3541,  4015,  1500};

    public Example_17() throws Exception {
        PDF pdf = new PDF(
                new BufferedOutputStream(new FileOutputStream("Example_17.pdf")));
        pdf.setCompliance(Compliance.PDF_UA_1);
        pdf.setTitle("Electric Vehicles by Model Year");

        Font f1 = new Font(pdf, IBMPlexSans.SemiBold);
        Font f2 = new Font(pdf, IBMPlexSans.Regular);

        Page page = new Page(pdf, Letter.PORTRAIT);

        TextLine title = new TextLine(f1, "Electric Vehicles by Model Year");
        title.setStructureType(StructElem.H1);
        title.setFontSize(18f);
        title.setLocation(50f, 50f);
        title.drawOn(page);

        TextBlock textBlock = new TextBlock(f2,
                "A line chart is a Chart with a Series for each line: the points of the "
                + "series are added in the order they are joined, and setDrawPath draws "
                + "the line through them. The markers are left visible here so that the "
                + "count for each model year can be read off the line; setShape with "
                + "Shape.INVISIBLE leaves the line alone.\n\n"
                + "The counts are the vehicles of "
                + "data/Electric_Vehicle_Population_Data.csv, the file Example_43 draws "
                + "as a table of 2,546 pages, by model year and by kind.");
        textBlock.setFontSize(11f);
        textBlock.setLineSpacing(1.4f);
        textBlock.setLocation(50f, 72f);
        textBlock.setWidth(512f);
        float[] xy = textBlock.drawOn(page);

        f1.setSize(12f);
        f2.setSize(9f);

        Chart chart = new Chart(f1, f2);
        chart.setLocation(70f, xy[1] + 30f);
        chart.setSize(480f, 340f);
        chart.setTitle("Battery electric and plug-in hybrid vehicles");
        chart.setSubtitle("Registrations in the Washington State data file");
        chart.setXAxisTitle("Model year");
        chart.setYAxisTitle("Vehicles");
        // The years and the counts are whole numbers, so the axis labels are.
        chart.setMaximumFractionDigits(0);
        // The axes are set rather than worked out from the points, so that
        // every label of the years is a year: 2011 to 2023 in six steps is one
        // every two years, where the range a chart picks for itself would be
        // 2010 to 2025 in steps of two and a half.
        chart.setXAxisMinMax(2011f, 2023f, 6);
        chart.setYAxisMinMax(0f, 25000f, 5);
        chart.setAltDescription(
                "A line chart of the vehicles of the data file by model year, from 2011 "
                + "to 2023. Battery electric vehicles rise from 753 in 2011 to 23,507 in "
                + "2022 and fall to 11,853 in 2023, the last model year of the file. "
                + "Plug-in hybrids stay far lower, from 75 in 2011 to a high of 4,278 in "
                + "2018 and 1,500 in 2023.");

        Series battery = chart.addSeries("Battery electric")
                .setDrawPath(true)
                .setStrokeColor(0x1D3557)       // navy blue
                .setStrokeWidth(1.5f);
        for (int i = 0; i < YEARS.length; i++) {
            battery.addPoint(new Point(YEARS[i], BATTERY[i]));
        }

        Series hybrid = chart.addSeries("Plug-in hybrid")
                .setDrawPath(true)
                .setStrokeColor(0xC1121F)       // deep red
                .setStrokeWidth(1.5f);
        for (int i = 0; i < YEARS.length; i++) {
            hybrid.addPoint(new Point(YEARS[i], HYBRID[i]));
        }

        chart.drawOn(page);

        pdf.complete();
    }

    public static void main(String[] args) throws Exception {
        long time0 = System.currentTimeMillis();
        new Example_17();
        long time1 = System.currentTimeMillis();
        System.out.printf("Example_17 => %4d ms%n", time1 - time0);
    }
}   // End of Example_17.java