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/**
* Title: Intersection
* Description: A binary intersection operator class for the Event Analysis
* Configurator. Acts as a sort of filter, combining two event
* streams into one.
*/
package EAC;
import java.awt.*;
public class Intersection extends Operator {
// Where did the last event come from?
protected Primitive last_event_source;
public Intersection(EACPanel p) {
super(p);
last_event_source = null;
} /* constructor */
public void draw() throws BoundsException {
// the intersection symbol
final char iSymbol = '^';
// subtle adjustments to position symbol within circle
final int xTweak = 2;
final int yTweak = -5;
char symbol[] = new char[1];
Graphics g = canvas.getGraphics();
super.draw();
symbol[0] = iSymbol;
g.drawChars(symbol,0,1,
anchor.x + (int) (DIAMETER / 2) - xTweak,
anchor.y + (int) (DIAMETER / 2) - yTweak);
} /* draw */
public void event(Source s) throws ConnectionException {
//System.out.println("Intersection event");
if (last_event_source == null)
last_event_source = s;
else if (last_event_source != s) { // we've now gotten events from two distinct sources
int i;
last_event_source = null;
for (i = 0; i < output_count; i++)
output[i].event(s);
} // else no-op, because this event is from the same source as the last event
} /* event */
public void write(File f) throws java.io.IOException {
f.writeInt(f.INTERSECTION);
f.writeInt(anchor.x);
f.writeInt(anchor.y);
} /* write */
public void read(File f) throws java.io.IOException {
anchor = new Point();
anchor.x = f.readInt();
anchor.y = f.readInt();
} /* read */
}
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