que - mousemoved java ejemplo

Java: cómo recibir coordenadas de puntos después del lanzamiento del botón del mouse(JFreeChart)

Question

Escribí un diagrama de parábola simple usando JFreeChart. Obtengo coordenadas de puntos gráficos, cuando presiona el botón del mouse y también quiero obtener coordenadas de puntos gráficos, cuando se suelta el botón del mouse. Pero chartMouseMoved no funciona mientras presiona el botón del mouse. ¿Cómo puedo resolver mi problema y obtener coordenadas gráficas después de soltar el botón del mouse?

Este es mi código:

package parabolademo;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.function.Function2D;
import org.jfree.data.function.PolynomialFunction2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;


public class ParabolaDemo extends ApplicationFrame {

    /*
     * @param title  the frame title.
     */
    int flag = 0;
    double delta = 0;
    double px = 0.0, py = 0.0, prx = 0.0, pry = 0.0, chartpx = 0.0, chartpy = 0.0, 
            chartX = 0.0, chartY = 0.0;
    int windowheight = 270;
    public ParabolaDemo(final String title) {

        super(title);
        double[] a = {0.0, 0.0, 1.0};
        Function2D p = new PolynomialFunction2D(a);
        double lrange = -20.0;
        double rrange = 20.0;
        XYDataset dataset = DatasetUtilities.sampleFunction2D(p, lrange, rrange, 1000, "y = f(x)");
        double max = 0.0;

        if (a[2] < 0) {
            max = p.getValue(-a[1] / 2*a[2]);
        }
        else {
            if (p.getValue(lrange) > p.getValue(rrange))
                max = p.getValue(lrange);
            else
                max = p.getValue(rrange);
        }
        System.out.println("max = " + max);
        delta = max / 16.4;

        final JFreeChart chart = ChartFactory.createXYLineChart(
            "Parabola",
            "X", 
            "Y", 
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false
        );

        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.addMouseListener(new CustomListener());
        chartPanel.addChartMouseListener(new ChartMouseListener() {

            @Override
            public void chartMouseClicked(ChartMouseEvent cme) {

            }

            @Override
            public void chartMouseMoved(ChartMouseEvent cme) {
                ChartEntity ce = cme.getEntity();
                if (ce instanceof XYItemEntity) {
                    XYItemEntity e = (XYItemEntity) ce;
                    XYDataset d = ((XYItemEntity) ce).getDataset();
                    int i = ((XYItemEntity) ce).getItem();
                    chartpx = d.getXValue(0, i);
                    chartpy = d.getYValue(0, i);
                    //System.out.println("X:" + chartpx + ", Y:" + chartpy);
                }
                Point2D po = chartPanel.translateScreenToJava2D(cme.getTrigger().getPoint());
                Rectangle2D plotArea = chartPanel.getScreenDataArea();
                XYPlot plot = (XYPlot) chart.getPlot(); // your plot
                chartX = plot.getDomainAxis().java2DToValue(po.getX(), plotArea, plot.getDomainAxisEdge());
                chartY = plot.getRangeAxis().java2DToValue(po.getY(), plotArea, plot.getRangeAxisEdge());
                System.out.println("X:" + chartX + ", Y:" + chartY);
            }
        });
        chartPanel.setPreferredSize(new java.awt.Dimension(500, windowheight));
        chartPanel.setDomainZoomable(false);
        chartPanel.setRangeZoomable(false);
        setContentPane(chartPanel);
    }

    public static void main(final String[] args) {

        final ParabolaDemo demo = new ParabolaDemo("Parabola Plot Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }


    public class CustomListener implements MouseListener {

          public void mouseClicked(MouseEvent e) {

          }

          public void mouseEntered(MouseEvent e) {

          }

          public void mouseExited(MouseEvent e) {

          }

          public void mousePressed(MouseEvent e) {
              flag = 1;
              px = chartpx;
              py = chartpy;
              System.out.println("Mouse Pressed! xpos = " + px + "; py = " + py);
          }

          public void mouseReleased(MouseEvent e) {
              flag = 1;
              prx = chartX;
              pry = chartY;
              System.out.println("Mouse Released! xpos = " + prx + "; py = " + pry);
          }
     }
}

¡Gracias por adelantado!

Answer 1

Como se muestra aquí , ChartPanel usa el gesto de hacer clic, arrastrar y soltar para manejar el zoom; setMouseZoomable(false) no cambia eso.

Trabajando a partir de la sugerencia que se muestra aquí , el siguiente ejemplo completo imprime las coordenadas de cualquier punto cliqueado. Amplié la forma de la serie para que sea más fácil ver el efecto. Además, los objetos de Swing GUI se deben construir y manipular solo en el hilo de envío del evento .

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Rectangle;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.function.Function2D;
import org.jfree.data.function.PolynomialFunction2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.ShapeUtilities;

public class ParabolaDemo extends ApplicationFrame {

    /*
     * @see https://stackoverflow.com/a/20107935/230513
     * @see https://stackoverflow.com/q/20081801/230513
     */
    public ParabolaDemo(final String title) {

        super(title);
        double[] a = {0.0, 0.0, 3.0};
        Function2D p = new PolynomialFunction2D(a);
        XYDataset dataset = DatasetUtilities.sampleFunction2D(
            p, -20.0, 20.0, 20, "y = 3x² {-20…20}");
        final JFreeChart chart = ChartFactory.createXYLineChart("Parabola",
            "X", "Y", dataset, PlotOrientation.VERTICAL, true, true, false);
        final XYPlot plot = (XYPlot) chart.getPlot();
        XYLineAndShapeRenderer r = (XYLineAndShapeRenderer) plot.getRenderer();
        r.setBaseShapesVisible(true);
        r.setSeriesShape(0, ShapeUtilities.createTranslatedShape(
            new Rectangle(12, 12), -6, -6));
        final ChartPanel chartPanel = new ChartPanel(chart) {

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(640, 480);
            }
        };
        chartPanel.addChartMouseListener(new ChartMouseListener() {

            @Override
            public void chartMouseClicked(ChartMouseEvent cme) {
                report(cme);
            }

            @Override
            public void chartMouseMoved(ChartMouseEvent cme) {
                //report(cme);
            }

            private void report(ChartMouseEvent cme) {
                ChartEntity ce = cme.getEntity();
                if (ce instanceof XYItemEntity) {
                    XYItemEntity e = (XYItemEntity) ce;
                    XYDataset d = e.getDataset();
                    int s = e.getSeriesIndex();
                    int i = e.getItem();
                    System.out.println("X:" + d.getX(s, i) + ", Y:" + d.getY(s, i));
                }
            }
        });
        setContentPane(chartPanel);
    }

    public static void main(final String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                final ParabolaDemo demo = new ParabolaDemo("Parabola Demo");
                demo.pack();
                RefineryUtilities.centerFrameOnScreen(demo);
                demo.setVisible(true);
            }
        });
    }
}