Question

我找到了SWTChart library并且想知道如何用鼠标选择范围，例如在x轴上1到3，我将获得属于所选x值的所有y轴值。

a busy cat http://www.swtchart.org/screenshots/img/area.png

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;
    }
}

如何在上面的示例中包含用于选择范围的鼠标事件？

提前谢谢。

Answer 1

以下代码应该让您了解如何执行此操作。基本上，您必须获取chartArea的{{1}}，添加chart和SWT.MouseDown的听众，并记住这两个事件的位置。回答您的评论：是的，您可以使用SWT.MouseUp监听器添加“突出显示”功能。

SWT.Paint

SWTChart鼠标事件处理

1 个答案: