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/**
* Title: Connector
* Description: Connects two primitives in the Event Analysis Configurator
*/
package EAC;
import java.awt.*;
public class Connector extends Primitive {
// for drawing
protected RubberbandLine rbLine;
// Primitives connected by connector
Primitive startP,
endP;
// the second point of the connector
// (the anchor point is inherited from Primitive)
protected Point endpoint;
public Connector(EACPanel p) {
super(p);
rbLine = new RubberbandLine(p);
}
// inappropriate inherited methods: should not be used
public void setTop(Point p) {}
public Point getTop() { return null; }
public void setEndpoint(Point p) {
endpoint = p;
} /* setEndpoint */
public Point getEndpoint() {
return endpoint;
} /* getEndpoint */
// Anchor the rubberband line AND the connector itself
public void anchor(Point p) {
rbLine.anchor(p);
anchor = p;
} /* anchor */
// Stretch the rubberband line
public void stretch(Point p) {
rbLine.stretch(p);
} /* stretch */
// End the rubberband line AND the connector itself
public void end(Point p) {
rbLine.end(p);
endpoint = p;
} /* end */
public void draw() throws BoundsException {
if (inBounds()) {
Graphics g = canvas.getGraphics();
g.drawLine(anchor.x,anchor.y,endpoint.x,endpoint.y);
drawArrowhead(g);
} else
throw new BoundsException("ERROR: Attempted to place Connector endpoint out of bounds");
} /* draw */
private void drawArrowhead(Graphics g) {
final int arrowHeadWidth = 10;
Point P1 = anchor;
Point P2 = endpoint;
// Draw Arrowhead (using java.lang.Math and floating point)
// source provided by Erik in newsgroup posting
double dx = P2.x - P1.x;
double dy = P2.y - P1.y;
final double ra = java.lang.Math.sqrt(dx*dx + dy*dy);
final double ri = (double) arrowHeadWidth;
dx /= ra;
dy /= ra;
Point p2 = new Point((int)Math.round(P2.x - dx*ri),
(int)Math.round(P2.y - dy*ri));
int[] x = new int[3];
int[] y = new int[3];
double r = 0.4 * ri;
x[0] = (int)Math.round(p2.x + dy * r);
y[0] = (int)Math.round(p2.y - dx * r);
x[1] = P2.x;
y[1] = P2.y;
x[2] = (int)Math.round(p2.x - dy * r);
y[2] = (int)Math.round(p2.y + dx * r);
g.fillPolygon(x, y, x.length);
} /* drawArrowhead */
public boolean contains(Point p) {
return false;
} /* contains */
public Point upperLeft() {
return anchor;
} /* upperLeft */
public Point lowerRight() {
return endpoint;
} /* lowerRight */
public Point upperRight() {
return endpoint;
} /* upperRight */
public Point lowerLeft() {
return anchor;
} /* lowerLeft */
public boolean inBounds() {
if (canvas.contains(endpoint))
return true;
else
return false;
} /* inBounds */
public void write(File f) throws java.io.IOException {
f.writeInt(f.CONNECTOR);
f.writeInt(anchor.x);
f.writeInt(anchor.y);
f.writeInt(endpoint.x);
f.writeInt(endpoint.y);
} /* write */
public void read(File f) throws java.io.IOException {
anchor = new Point();
endpoint = new Point();
anchor.x = f.readInt();
anchor.y = f.readInt();
endpoint.x = f.readInt();
endpoint.y = f.readInt();
} /* read */
public int addInput(Connector c) throws ConnectionException {
throw new ConnectionException("ERROR: Connectors cannot connect each other");
} /* addInput */
public int addOutput(Connector c) throws ConnectionException {
throw new ConnectionException("ERROR: Connectors cannot connect each other");
} /* addOutput */
public void setInput(Primitive p) {
startP = p;
} /* setInput */
public void setOutput(Primitive p) {
endP = p;
} /* setOutput */
public Primitive getInput() {
return startP;
} /* getInput */
public Primitive getOutput() {
return endP;
} /* getOutput */
public Connector getInput(int i) throws ConnectionException {
throw new ConnectionException("Internal error: wrong getInput() called on Connector");
} /* getInput */
public Connector getOutput(int i) throws ConnectionException {
throw new ConnectionException("Internal error: wrong getOutput() called on Connector");
} /* getOutput */
public void removeInput(int i) throws ConnectionException {
//throw new ConnectionException("ERROR: Attempted to remove input from connector");
startP = null;
} /* removeInput */
public void removeOutput(int i) throws ConnectionException {
//throw new ConnectionException("ERROR: Attempted to remove output from connector");
endP = null;
} /* removeOutput */
public int getInputCount() throws ConnectionException {
//throw new ConnectionException("ERROR: Attempted to retrieve input count from connector");
return (startP == null) ? 0 : 1;
} /* getInputCount */
public int getOutputCount() throws ConnectionException {
//throw new ConnectionException("ERROR: Attempted to retrieve output count from connector");
return (endP == null) ? 0 : 1;
} /* getOutputCount */
public void event(Source s) throws ConnectionException {
//throw new ConnectionException("ERROR: Attempted to push event to connector");
endP.event(s);
} /* event */
public void wakeup(long t) throws ConnectionException {
throw new ConnectionException("ERROR: Attempted to wake up connector");
} /* wakeup */
}
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