Java Zoomable类代码示例

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Handle the case where a plot implements the {@link Zoomable} interface.
 *
 * @param zoomable  the zoomable plot.
 * @param e  the mouse wheel event.
 */
private void handleZoomable(ChartCanvas canvas, Zoomable zoomable, 
        ScrollEvent e) {
    // don't zoom unless the mouse pointer is in the plot's data area
    ChartRenderingInfo info = canvas.getRenderingInfo();
    PlotRenderingInfo pinfo = info.getPlotInfo();
    Point2D p = new Point2D.Double(e.getX(), e.getY());
    if (pinfo.getDataArea().contains(p)) {
        Plot plot = (Plot) zoomable;
        // do not notify while zooming each axis
        boolean notifyState = plot.isNotify();
        plot.setNotify(false);
        int clicks = (int) e.getDeltaY();
        double zf = 1.0 + this.zoomFactor;
        if (clicks < 0) {
            zf = 1.0 / zf;
        }
        if (canvas.isDomainZoomable()) {
            zoomable.zoomDomainAxes(zf, pinfo, p, true);
        }
        if (canvas.isRangeZoomable()) {
            zoomable.zoomRangeAxes(zf, pinfo, p, true);
        }
        plot.setNotify(notifyState);  // this generates the change event too
    } 
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Handle the case where a plot implements the {@link Zoomable} interface.
 *
 * @param zoomable  the zoomable plot.
 * @param e  the mouse wheel event.
 */
private void handleZoomable(ChartCanvas canvas, Zoomable zoomable, 
        ScrollEvent e) {
    // don't zoom unless the mouse pointer is in the plot's data area
    ChartRenderingInfo info = canvas.getRenderingInfo();
    PlotRenderingInfo pinfo = info.getPlotInfo();
    Point2D p = new Point2D.Double(e.getX(), e.getY());
    if (pinfo.getDataArea().contains(p)) {
        Plot plot = (Plot) zoomable;
        // do not notify while zooming each axis
        boolean notifyState = plot.isNotify();
        plot.setNotify(false);
        int clicks = (int) e.getDeltaY();
        double zf = 1.0 + this.zoomFactor;
        if (clicks < 0) {
            zf = 1.0 / zf;
        }
        if (true) { //this.chartPanel.isDomainZoomable()) {
            zoomable.zoomDomainAxes(zf, pinfo, p, true);
        }
        if (true) { //this.chartPanel.isRangeZoomable()) {
            zoomable.zoomRangeAxes(zf, pinfo, p, true);
        }
        plot.setNotify(notifyState);  // this generates the change event too
    } 
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Decreases the length of the domain axis, centered about the given
 * coordinate on the screen.  The length of the domain axis is reduced
 * by the value of {@link #getZoomInFactor()}.
 *
 * @param x  the x coordinate (in screen coordinates).
 * @param y  the y-coordinate (in screen coordinates).
 */
public void zoomInDomain(double x, double y) {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        Zoomable z = (Zoomable) plot;
        z.zoomDomainAxes(this.zoomInFactor, this.info.getPlotInfo(),
                translateScreenToJava2D(new Point((int) x, (int) y)),
                this.zoomAroundAnchor);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Decreases the length of the range axis, centered about the given
 * coordinate on the screen.  The length of the range axis is reduced by
 * the value of {@link #getZoomInFactor()}.
 *
 * @param x  the x-coordinate (in screen coordinates).
 * @param y  the y coordinate (in screen coordinates).
 */
public void zoomInRange(double x, double y) {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        Zoomable z = (Zoomable) plot;
        z.zoomRangeAxes(this.zoomInFactor, this.info.getPlotInfo(),
                translateScreenToJava2D(new Point((int) x, (int) y)),
                this.zoomAroundAnchor);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Increases the length of the domain axis, centered about the given
 * coordinate on the screen.  The length of the domain axis is increased
 * by the value of {@link #getZoomOutFactor()}.
 *
 * @param x  the x coordinate (in screen coordinates).
 * @param y  the y-coordinate (in screen coordinates).
 */
public void zoomOutDomain(double x, double y) {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        Zoomable z = (Zoomable) plot;
        z.zoomDomainAxes(this.zoomOutFactor, this.info.getPlotInfo(),
                translateScreenToJava2D(new Point((int) x, (int) y)),
                this.zoomAroundAnchor);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Increases the length the range axis, centered about the given
 * coordinate on the screen.  The length of the range axis is increased
 * by the value of {@link #getZoomOutFactor()}.
 *
 * @param x  the x coordinate (in screen coordinates).
 * @param y  the y-coordinate (in screen coordinates).
 */
public void zoomOutRange(double x, double y) {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        Zoomable z = (Zoomable) plot;
        z.zoomRangeAxes(this.zoomOutFactor, this.info.getPlotInfo(),
                translateScreenToJava2D(new Point((int) x, (int) y)),
                this.zoomAroundAnchor);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Restores the auto-range calculation on the domain axis.
 */
public void restoreAutoDomainBounds() {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        Zoomable z = (Zoomable) plot;
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        // we need to guard against this.zoomPoint being null
        Point2D zp = (this.zoomPoint != null
                ? this.zoomPoint : new Point());
        z.zoomDomainAxes(0.0, this.info.getPlotInfo(), zp);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Restores the auto-range calculation on the range axis.
 */
public void restoreAutoRangeBounds() {
    Plot plot = this.chart.getPlot();
    if (plot instanceof Zoomable) {
        Zoomable z = (Zoomable) plot;
        // here we tweak the notify flag on the plot so that only
        // one notification happens even though we update multiple
        // axes...
        boolean savedNotify = plot.isNotify();
        plot.setNotify(false);
        // we need to guard against this.zoomPoint being null
        Point2D zp = (this.zoomPoint != null
                ? this.zoomPoint : new Point());
        z.zoomRangeAxes(0.0, this.info.getPlotInfo(), zp);
        plot.setNotify(savedNotify);
    }
}
 

import org.jfree.chart.plot.Zoomable; //导入依赖的package包/类
/**
 * Handles a mouse wheel event from the underlying chart panel.
 *
 * @param e  the event.
 */
@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    JFreeChart chart = this.chartPanel.getChart();
    if (chart == null) {
        return;
    }
    Plot plot = chart.getPlot();
    if (plot instanceof Zoomable) {
        Zoomable zoomable = (Zoomable) plot;
        handleZoomable(zoomable, e);
    }
    else if (plot instanceof PiePlot) {
        PiePlot pp = (PiePlot) plot;
        pp.handleMouseWheelRotation(e.getWheelRotation());
    }
}