package org.sjwimmer.tacharting.chart.view.jfreechart; import javafx.scene.input.ScrollEvent; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PiePlot; import org.jfree.chart.plot.Plot; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.Zoomable; import java.awt.geom.Point2D; public class TaScrollHandlerFX extends TaAbstractMouseHandlerFX implements TaMouseHandlerFX { /** The zoom factor. */ private double zoomFactor = 0.1; /** * Creates a new instance with the specified ID. * * @param id the handler ID ({@code null} not permitted). */ public TaScrollHandlerFX(String id) { super(id, false, false, false, false); this.zoomFactor = 0.1; }; /** * Returns the zoom factor. The default value is 0.10 (ten percent). * * @return The zoom factor. */ public double getZoomFactor() { return this.zoomFactor; } /** * Sets the zoom factor (a percentage amount by which the mouse wheel * movement will change the org.sjwimmer.tacharting.chart size). * * @param zoomFactor the zoom factor. */ public void setZoomFactor(double zoomFactor) { this.zoomFactor = zoomFactor; } @Override public void handleScroll(TaChartCanvas canvas, ScrollEvent e) { JFreeChart chart = canvas.getChart(); Plot plot = chart.getPlot(); if (plot instanceof Zoomable) { Zoomable zoomable = (Zoomable) plot; handleZoomable(canvas, zoomable, e); } else if (plot instanceof PiePlot) { PiePlot pp = (PiePlot) plot; pp.handleMouseWheelRotation((int) e.getDeltaY()); } } /** * 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(TaChartCanvas canvas, Zoomable zoomable, ScrollEvent e) { // don't zoom unless the mouse pointer is in the plot's org.sjwimmer.tacharting.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 } } }