StrokeHandler.java

package edu.stanford.hci.r3.events.handlers;

import edu.stanford.hci.r3.events.EventHandler;
import edu.stanford.hci.r3.events.PenEvent;
import edu.stanford.hci.r3.pen.ink.InkStroke;
import edu.stanford.hci.r3.util.DebugUtils;

public abstract class StrokeHandler extends EventHandler {

        private PenEvent lastEvent;

        private boolean penDownHappened = false;

        private InkStroke stroke;

        public InkStroke getStroke() {
                return stroke;
        }
        
        public void handleEvent(PenEvent event) {
                if (event.isTypePenDown()) {
                        stroke = new InkStroke();
                        penDownHappened = true;
                } else if (event.isTypePenUp()) {
                        // really, this should always be true
                        if (penDownHappened) {
                                strokeArrived(lastEvent);
                                penDownHappened = false;
                                return;
                        }
                }
                
                if (event == null || event.getOriginalSample() == null) {
                        DebugUtils.println("Event Object is NULL");
                } else {
                        stroke.addSample(event.getOriginalSample());
                        lastEvent = event;
                }

                // do not consume the event (event has a consumed property that we do not set here)
        }

        public abstract void strokeArrived(PenEvent e);
        
        public String toString() {
                return "StrokeHandler";
        }
}

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