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SWTChartライブラリを見つけましたが、マウスでx軸の範囲（たとえば1〜3）を選択すると、選択したx値に属するすべてのy軸の値を取得できるのではないかと思います。

忙しい猫
（出典：swtchart.org）

package org.swtchart.examples;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.swtchart.Chart;
import org.swtchart.ILineSeries;
import org.swtchart.ISeries.SeriesType;

/**
* An example for area chart.
*/
public class AreaChartExample {

    private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 };

    private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 };

    /**
    * The main method.
    * 
    * @param args
    *            the arguments
    */
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Area Chart");
        shell.setSize(500, 400);
        shell.setLayout(new FillLayout());

        createChart(shell);

        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }

    /**
    * create the chart.
    * 
    * @param parent
    *            The parent composite
    * @return The created chart
    */
    static public Chart createChart(Composite parent) {

        // create a chart
        Chart chart = new Chart(parent, SWT.NONE);

        // set titles
        chart.getTitle().setText("Area Chart");

        // create line series
        ILineSeries lineSeries1 = (ILineSeries) chart.getSeriesSet()
                .createSeries(SeriesType.LINE, "line series 1");
        lineSeries1.setYSeries(ySeries1);
        lineSeries1.setLineColor(Display.getDefault().getSystemColor(
                SWT.COLOR_RED));
        lineSeries1.enableArea(true);

        ILineSeries lineSeries2 = (ILineSeries) chart.getSeriesSet()
                .createSeries(SeriesType.LINE, "line series 2");
        lineSeries2.setYSeries(ySeries2);
        lineSeries2.enableArea(true);

        // adjust the axis range
        chart.getAxisSet().adjustRange();

        return chart;
    }
}

上記の例で範囲を選択するためのマウスイベントを含めるにはどうすればよいですか？

前もって感謝します。

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1 に答える 1

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次のコードは、これを行う方法についてのアイデアを提供するはずです。基本的に、chartAreaのを取得し、chartリスナーを追加して、両方のイベントの位置を覚えておく必要がSWT.MouseDownあります。SWT.MouseUpコメントに答えるには：はい、SWT.Paintリスナーを使用して「ハイライト」機能を追加できます。

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.swtchart.Chart;
import org.swtchart.IAxis;
import org.swtchart.ILineSeries;
import org.swtchart.ISeries.SeriesType;

    /**
    * An example for area chart.
    */
    public class AreaChartExample {

        private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 };

        private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 };

        /* Used to remember location point of mouse down */
        private static double startX;
        private static double startY;

        private static int startXPos;
        private static int startYPos;

        private static int currentX;
        private static int currentY;

        private static boolean drag = false;

        /**
        * The main method.
        * 
        * @param args
        *            the arguments
        */
        public static void main(String[] args) {
            Display display = new Display();
            Shell shell = new Shell(display);
            shell.setText("Area Chart");
            shell.setSize(500, 400);
            shell.setLayout(new FillLayout());

            createChart(shell);

            shell.open();
            while (!shell.isDisposed()) {
                if (!display.readAndDispatch()) {
                    display.sleep();
                }
            }
            display.dispose();
        }

        /**
        * create the chart.
        * 
        * @param parent
        *            The parent composite
        * @return The created chart
        */
        static public Chart createChart(Composite parent) {

            // create a chart
            final Chart chart = new Chart(parent, SWT.NONE);

            // set titles
            chart.getTitle().setText("Area Chart");

            // create line series
            ILineSeries lineSeries1 = (ILineSeries) chart.getSeriesSet()
                    .createSeries(SeriesType.LINE, "line series 1");
            lineSeries1.setYSeries(ySeries1);
            lineSeries1.setLineColor(Display.getDefault().getSystemColor(
                    SWT.COLOR_RED));
            lineSeries1.enableArea(true);

            ILineSeries lineSeries2 = (ILineSeries) chart.getSeriesSet()
                    .createSeries(SeriesType.LINE, "line series 2");
            lineSeries2.setYSeries(ySeries2);
            lineSeries2.enableArea(true);

            // adjust the axis range
            chart.getAxisSet().adjustRange();

            /* Get the plot area and add the mouse listeners */
            final Composite plotArea = chart.getPlotArea();

            plotArea.addListener(SWT.MouseDown, new Listener() {

                @Override
                public void handleEvent(Event event) {
                    IAxis xAxis = chart.getAxisSet().getXAxis(0);
                    IAxis yAxis = chart.getAxisSet().getYAxis(0);

                    startX = xAxis.getDataCoordinate(event.x);
                    startY = yAxis.getDataCoordinate(event.y);

                    startXPos = event.x;
                    startYPos = event.y;

                    drag = true;
                }
            });

            plotArea.addListener(SWT.MouseUp, new Listener() {

                @Override
                public void handleEvent(Event event) {
                    IAxis xAxis = chart.getAxisSet().getXAxis(0);
                    IAxis yAxis = chart.getAxisSet().getYAxis(0);

                    double endX = xAxis.getDataCoordinate(event.x);
                    double endY = yAxis.getDataCoordinate(event.y);

                    System.out.println(startX + " " + endX);
                    System.out.println(startY + " " + endY);

                    drag = false;

                    plotArea.redraw();
                }
            });

            plotArea.addListener(SWT.MouseMove, new Listener() {

                @Override
                public void handleEvent(Event event) {
                    if(drag)
                    {
                        currentX = event.x;
                        currentY = event.y;

                        plotArea.redraw();
                    }
                }
            });

            plotArea.addListener(SWT.Paint, new Listener() {

                @Override
                public void handleEvent(Event event) {
                    if(drag)
                    {
                        GC gc = event.gc;

                        gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_RED));
                        gc.setAlpha(128);

                        int minX = Math.min(startXPos, currentX);
                        int minY = Math.min(startYPos, currentY);

                        int maxX = Math.max(startXPos, currentX);
                        int maxY = Math.max(startYPos, currentY);

                        int width = maxX - minX;
                        int height = maxY - minY;

                        gc.fillRectangle(minX, minY, width, height);
                    }
                }
            });

            return chart;
        }
    }
于 2012-09-14T08:07:55.180 に答える