/*
* @(#)ElbowHandle.java
*
* Project: JHotdraw - a GUI framework for technical drawings
* http://www.jhotdraw.org
* http://jhotdraw.sourceforge.net
* Copyright: ? by the original author(s) and all contributors
* License: Lesser GNU Public License (LGPL)
* http://www.opensource.org/licenses/lgpl-license.html
*/
package research;
import research.connection.LineConnection;
import research.connection.ElbowConnection;
import research.connector.Connector;
import java.awt.*;
import java.awt.event.InputEvent;
import research.util.Geom;
/**
* A Handle to move an ElbowConnection left/right or up/down.
*
* @version <$CURRENT_VERSION$>
*/
public class ElbowHandle extends AbstractHandle {
private int fSegment;
private int fLastX, fLastY; // previous mouse position
public ElbowHandle(ElbowConnection owner, int segment) {
super(owner);
fSegment = segment;
}
public void invokeStart(int x, int y, DrawingView view) {
fLastX = x;
fLastY = y;
}
public void invokeStep(InputEvent inputEvent, int x, int y, int anchorX, int anchorY, DrawingView view) {
ElbowConnection line = ownerConnection();
if ((fSegment == 0) || (fSegment == line.pointCount() - 2)){
return;
} else {
Point p1 = line.pointAt(fSegment);
Point p2 = line.pointAt(fSegment + 1);
int ddx = x - fLastX;
int ddy = y - fLastY;
boolean isStartVertical = true;
int displayMode = ((Integer) line.getAttribute(ElbowConnection.DISPLAY_MODE)).intValue();
if (displayMode == ElbowConnection.N_S_MODE) {
isStartVertical = true;
} else if (displayMode == ElbowConnection.W_E_MODE) {
isStartVertical = false;
} else {
int direction = line.getStartConnector().getDirection();
if (direction == Connector.NORTH_DIRECTION || direction == Connector.SOUTH_DIRECTION) {
isStartVertical = true;
} else if (direction == Connector.WEST_DIRECTION || direction == Connector.EAST_DIRECTION) {
isStartVertical = false;
} else if (direction == Connector.NONE_DIRECTION) {
isStartVertical = false;
}
}
boolean isCurrentVertical = isStartVertical;
if (fSegment % 2 == 1)
isCurrentVertical = !isStartVertical;
Point np1;
Point np2;
//if (isVertical(p1, p2)) {
if (isCurrentVertical) {
int cx = constrainX(p1.x + ddx);
np1 = new Point(cx, p1.y);
np2 = new Point(cx, p2.y);
} else {
int cy = constrainY(p1.y + ddy);
np1 = new Point(p1.x, cy);
np2 = new Point(p2.x, cy);
}
line.setPointAt(np1, fSegment);
line.setPointAt(np2, fSegment + 1);
fLastX = x;
fLastY = y;
}
}
public Point locate() {
LineConnection line = ownerConnection();
int segment = Math.min(fSegment, line.pointCount() - 2);
Point p1 = line.pointAt(segment);
Point p2 = line.pointAt(segment + 1);
return new Point((p1.x + p2.x) / 2, (p1.y + p2.y) / 2);
}
public void draw(Graphics g) {
Rectangle r = displayBox();
g.setColor(Color.yellow);
g.fillOval(r.x, r.y, r.width, r.height);
g.setColor(Color.black);
g.drawOval(r.x, r.y, r.width, r.height);
}
private int constrainX(int x) {
LineConnection line = ownerConnection();
Figure startFigure = line.getStartConnector().owner();
Figure endFigure = line.getEndConnector().owner();
Rectangle start = startFigure.getDisplayBox();
Rectangle end = endFigure.getDisplayBox();
Insets i1 = startFigure.connectionInsets();
Insets i2 = endFigure.connectionInsets();
int r1x, r1width, r2x, r2width;
r1x = start.x + i1.left;
r1width = start.width - i1.left - i1.right - 1;
r2x = end.x + i2.left;
r2width = end.width - i2.left - i2.right - 1;
if (fSegment == 0) {
x = Geom.range(r1x, r1x + r1width, x);
}
if (fSegment == line.pointCount() - 2) {
x = Geom.range(r2x, r2x + r2width, x);
}
return x;
}
private int constrainY(int y) {
LineConnection line = ownerConnection();
Figure startFigure = line.getStartConnector().owner();
Figure endFigure = line.getEndConnector().owner();
Rectangle start = startFigure.getDisplayBox();
Rectangle end = endFigure.getDisplayBox();
Insets i1 = startFigure.connectionInsets();
Insets i2 = endFigure.connectionInsets();
int r1y, r1height, r2y, r2height;
r1y = start.y + i1.top;
r1height = start.height - i1.top - i1.bottom - 1;
r2y = end.y + i2.top;
r2height = end.height - i2.top - i2.bottom - 1;
if (fSegment == 0) {
y = Geom.range(r1y, r1y + r1height, y);
}
if (fSegment == line.pointCount() - 2) {
y = Geom.range(r2y, r2y + r2height, y);
}
return y;
}
private ElbowConnection ownerConnection() {
return (ElbowConnection) owner();
}
}