// calculate the coordinates of the startpoint (endpoint) if parameter is
// true (false) of the arrow when drawing this link
private Point calcCoord(boolean startpoint) {
if (!startpoint && (end == null)) return openEnd;
int deltaX;
int deltaY;
if (end == null) {
deltaX = start.getX() - openEnd.x;
deltaY = start.getY() - openEnd.y;
} else {
deltaX = start.getX() - end.getX();
deltaY = start.getY() - end.getY();
}
double dist = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
double prop = (Client.RADIUS) / dist;
int offsetX = (int) Math.round(deltaX * prop);
int offsetY = (int) Math.round(deltaY * prop);
if (startpoint) {
return new Point(start.getX() - offsetX, start.getY() - offsetY);
} else return new Point(end.getX() + offsetX, end.getY() + offsetY);
}
// returns the endpoint which is closer to (x,y) than the other one
public Client getPointNear(int x, int y) {
if (start == null || end == null)
throw new RuntimeException("ERROR: getPointNear() not allowed on open links");
int distToStart = (int) Math.pow(start.getX() - x, 2) + (int) Math.pow(start.getY() - y, 2);
int distToEnd = (int) Math.pow(end.getX() - x, 2) + (int) Math.pow(end.getY() - y, 2);
if (distToStart < distToEnd) {
return start;
} else {
return end;
}
}
// get the delay of the next packet
public int getDelay() {
switch (delayType) {
case NO_DELAY:
return 0;
case CONST_DELAY:
return constDelayMs;
case DIST_DELAY:
// calculate distance between start and end node
int x = start.getX() - end.getX();
int y = start.getY() - end.getY();
float dist = (float) Math.sqrt(x * x + y * y);
return (int) (dist * distDelayFactor);
default:
throw new RuntimeException("ERROR: Illegal delay type " + delayType);
}
}
// returns true if (x,y) is close to the link
public boolean intersects(int x0, int y0) {
if (end == null) throw new RuntimeException("ERROR: intersect() not allowed on open links");
int x1, x2, y1, y2;
x1 = start.getX();
x2 = end.getX();
y1 = start.getY();
y2 = end.getY();
// calculate the distance between the direct start-end connection and the point
double o = Math.abs((x2 - x1) * (y1 - y0) - (x1 - x0) * (y2 - y1));
double u = Math.sqrt(Math.pow((x2 - x1), 2) + Math.pow((y2 - y1), 2));
if ((o / u) < INTERSECTION_DISTANCE) {
return true;
}
return false;
}
// draw the link
public void draw(Graphics g1D) {
// don't draw an open link if the end is inside of its startpoint
if ((end == null) && (openEnd.distance(start.getX(), start.getY()) < Client.RADIUS)) return;
// activate anti aliasing
Graphics2D g = (Graphics2D) g1D;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// set correct color
if ((end != null) && start.isRunning() && end.isRunning()) g.setColor(RUNNING_LINK_COLOR);
else g.setColor(SLEEPING_LINK_COLOR);
// calculate start- & endpoint and link length
Point s = new Point();
Point e = new Point();
double dist;
s.x = start.getX();
s.y = start.getY();
if (end == null) {
e.x = openEnd.x;
e.y = openEnd.y;
dist = s.distance(e) + Client.RADIUS;
} else {
e.x = end.getX();
e.y = end.getY();
dist = s.distance(e);
}
int fact = 1; // fact = +/- 1 (needed if s not on the left of e)
if (s.x > e.x) fact = -1;
// rotate g so that we can draw horizontally
double theta = Math.atan(((float) (e.y - s.y)) / (e.x - s.x));
g.rotate(theta, s.x, s.y);
// draw the link
Stroke old = g.getStroke();
if (getErrorType() == NO_ERROR) {
g.setStroke(normal);
} else {
g.setStroke(dashed);
}
if (this.isBidirectional) {
g.drawLine(
s.x + fact * (Client.RADIUS + ARROW_LENGTH),
s.y,
(s.x + fact * ((int) dist - Client.RADIUS - ARROW_LENGTH)),
s.y);
} else {
g.drawLine(
s.x + fact * Client.RADIUS,
s.y,
(s.x + fact * ((int) dist - Client.RADIUS - ARROW_LENGTH)),
s.y);
}
g.setStroke(old);
// draw the arrows
//
// /| |\ ^ W = ARROW_WIDTH
// < ------ > W L = ARROW_LENGTH
// \| |/ v
//
// <L>
// <-- dist -->
int arrowX[] = new int[3];
int arrowY[] = new int[3];
arrowX[0] = s.x + fact * (Client.RADIUS);
arrowX[1] = s.x + fact * (Client.RADIUS + ARROW_LENGTH);
arrowX[2] = s.x + fact * (Client.RADIUS + ARROW_LENGTH);
arrowY[0] = s.y;
arrowY[1] = s.y - ARROW_WIDTH / 2;
arrowY[2] = s.y + ARROW_WIDTH / 2;
if (this.isBidirectional) {
if (flashingStart) {
g.setColor(USED_LINK_COLOR);
g.fillPolygon(arrowX, arrowY, 3);
g.setColor(RUNNING_LINK_COLOR);
} else {
g.fillPolygon(arrowX, arrowY, 3);
}
} else {
}
arrowX[0] = s.x + fact * ((int) dist - Client.RADIUS);
arrowX[1] = s.x + fact * ((int) dist - Client.RADIUS - ARROW_LENGTH);
arrowX[2] = s.x + fact * ((int) dist - Client.RADIUS - ARROW_LENGTH);
if (flashingEnd) {
g.setColor(USED_LINK_COLOR);
g.fillPolygon(arrowX, arrowY, 3);
g.setColor(RUNNING_LINK_COLOR);
} else {
g.fillPolygon(arrowX, arrowY, 3);
}
// write delay & packet info to the link
if (end != null) {
// write delay above the link
String delayText = Integer.toString(getDelay()) + " ms";
if (delayText.equals("0 ms")) {
delayText = "no delay";
}
int delayWidth = g.getFontMetrics().stringWidth(delayText);
// draw the text only if there is enough space
if (delayWidth < dist - 2 * Client.RADIUS)
g.drawString(delayText, (int) (s.x + fact * dist / 2 - delayWidth / 2), s.y - 8);
// write sent/lost packets below the link
String packetText =
"sent: " + Integer.toString(succCount) + " lost: " + Integer.toString(lostCount);
String packetTextShort = Integer.toString(succCount) + " / " + Integer.toString(lostCount);
int packetWidth = g.getFontMetrics().stringWidth(packetText);
int packetWidthShort = g.getFontMetrics().stringWidth(packetTextShort);
// draw the text only if there is enough space
if (packetWidth < dist - 2 * Client.RADIUS)
g.drawString(packetText, (int) (s.x + fact * dist / 2 - packetWidth / 2), s.y + 15);
else if (packetWidthShort < dist - 2 * Client.RADIUS)
g.drawString(
packetTextShort, (int) (s.x + fact * dist / 2 - packetWidthShort / 2), s.y + 15);
}
// rotate g back
g.rotate(-theta, s.x, s.y);
}