/** * This class represents a relation line. Responsible for drawing the 2D stuff. * * @author <a href="mailto:[email protected]">Aslak Hellesøy</a> * @created 3. oktober 2001 * @version $Id: RelationLine.java,v 1.1 2005/10/25 14:59:22 lusu Exp $ */ public class RelationLine { /** @todo-javadoc Describe the column */ private final Stroke _regularStroke = new BasicStroke(2); /** @todo-javadoc Describe the column */ private final Stroke _dashedStroke = new BasicStroke(2, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10, new float[] {5, 5}, 0); /** @todo-javadoc Describe the column */ private boolean _isSelected; /** @todo-javadoc Describe the column */ // private final Relation _relation; private final RelationshipRole _leftRole; /** @todo-javadoc Describe the column */ private final RelationshipRole _rightRole; /** @todo-javadoc Describe the column */ private final JTablePanel _leftTable; /** @todo-javadoc Describe the column */ private final JTablePanel _rightTable; /** The lines from each key column to the main line on the western table */ private final Line2D.Float[] _leftLines; /** The lines from each key column to the main line on the eastern table */ private final Line2D.Float[] _rightLines; /** @todo-javadoc Describe the column */ private final Line2D.Float _mainLine; /** @todo-javadoc Describe the column */ private final Point2D.Float _leftArrowPoint; /** @todo-javadoc Describe the column */ private final Point2D.Float _rightArrowPoint; /** @todo-javadoc Describe the column */ private final Line2D.Float _leftArrowLine1; /** @todo-javadoc Describe the column */ private final Line2D.Float _leftArrowLine2; /** @todo-javadoc Describe the column */ private final Line2D.Float _rightArrowLine1; /** @todo-javadoc Describe the column */ private final Line2D.Float _rightArrowLine2; /** @todo-javadoc Describe the column */ private final Point2D.Float _leftArrowPoint1; /** @todo-javadoc Describe the column */ private final Point2D.Float _leftArrowPoint2; /** @todo-javadoc Describe the column */ private final Point2D.Float _rightArrowPoint1; /** @todo-javadoc Describe the column */ private final Point2D.Float _rightArrowPoint2; /** @todo-javadoc Describe the column */ private final Point2D.Float _temp; /** @todo-javadoc Describe the column */ private final AffineTransform _arrowTransform; /** @todo-javadoc Describe the column */ private final Point2D.Float _leftCardinalityPoint; /** @todo-javadoc Describe the column */ private final Point2D.Float _rightCardinalityPoint; /** @todo-javadoc Describe the column */ private final Point2D.Float _leftFkPoint; /** @todo-javadoc Describe the column */ private final Point2D.Float _rightFkPoint; /** @todo-javadoc Describe the column */ private double _mainLength; /** @todo-javadoc Describe the column */ private boolean _leftIsWest; /** Average y between all key columns */ private int _leftColumnY = 0; /** Average y between all key columns */ private int _rightColumnY = 0; /** @todo-javadoc Describe the field */ private int[] _leftEdgeY; /** @todo-javadoc Describe the field */ private int[] _rightEdgeY; /** @todo-javadoc Describe the column */ private static Image _star = new ImageIcon(RelationLine.class.getResource("star.gif")).getImage(); /** @todo-javadoc Describe the column */ private static Image _one = new ImageIcon(RelationLine.class.getResource("one.gif")).getImage(); /** @todo-javadoc Describe the column */ private static Image _star_white = new ImageIcon(RelationLine.class.getResource("star_white.gif")).getImage(); /** @todo-javadoc Describe the column */ private static Image _one_white = new ImageIcon(RelationLine.class.getResource("one_white.gif")).getImage(); /** @todo-javadoc Describe the column */ private static Image _fk = new ImageIcon(RelationLine.class.getResource("fk.gif")).getImage(); /** Get static reference to Log4J Logger */ private static org.apache.log4j.Category _log = org.apache.log4j.Category.getInstance(RelationLine.class.getName()); /** @todo-javadoc Describe the column */ private static RenderingHints _renderHints; /** * Creates new RelationLine * * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @param leftRole Describe what the parameter does * @param rightRole Describe what the parameter does * @param leftTable Describe what the parameter does * @param rightTable Describe what the parameter does */ public RelationLine( RelationshipRole leftRole, RelationshipRole rightRole, JTablePanel leftTable, JTablePanel rightTable) { _log.debug( "new RelationLine for " + leftTable.getTable().getSqlName() + "-" + rightTable.getTable().getSqlName()); _leftRole = leftRole; _rightRole = rightRole; _leftTable = leftTable; _rightTable = rightTable; // left table points _log.debug("A:" + _leftRole.getColumnMaps().length); _leftEdgeY = new int[_leftRole.getColumnMaps().length]; for (int i = 0; i < _leftEdgeY.length; i++) { _leftEdgeY[i] = _leftTable.getColumnY(_leftRole.getColumnMaps()[i].getPrimaryKey()); _leftColumnY += _leftEdgeY[i]; } _leftColumnY = _leftColumnY / _leftEdgeY.length; // right table points if (!_leftRole.getRelation().isMany2Many()) { _log.debug("M:" + _leftRole.getColumnMaps().length); _rightEdgeY = new int[_leftRole.getColumnMaps().length]; for (int i = 0; i < _rightEdgeY.length; i++) { _rightEdgeY[i] = _rightTable.getColumnY(_leftRole.getColumnMaps()[i].getForeignKey()); _rightColumnY += _rightEdgeY[i]; } _rightColumnY = _rightColumnY / _rightEdgeY.length; } else { _log.debug("B:" + _rightRole.getColumnMaps().length); _rightEdgeY = new int[_rightRole.getColumnMaps().length]; for (int i = 0; i < _rightEdgeY.length; i++) { _rightEdgeY[i] = _rightTable.getColumnY(_rightRole.getColumnMaps()[i].getPrimaryKey()); _rightColumnY += _rightEdgeY[i]; } _rightColumnY = _rightColumnY / _rightRole.getColumnMaps().length; } _leftLines = createLines(_leftEdgeY.length); _rightLines = createLines(_rightEdgeY.length); _mainLine = new Line2D.Float(); _leftCardinalityPoint = new Point2D.Float(); _rightCardinalityPoint = new Point2D.Float(); _leftFkPoint = new Point2D.Float(); _rightFkPoint = new Point2D.Float(); _leftArrowPoint = new Point2D.Float(); _rightArrowPoint = new Point2D.Float(); _leftArrowLine1 = new Line2D.Float(); _leftArrowLine2 = new Line2D.Float(); _rightArrowLine1 = new Line2D.Float(); _rightArrowLine2 = new Line2D.Float(); _leftArrowPoint1 = new Point2D.Float(); _leftArrowPoint2 = new Point2D.Float(); _rightArrowPoint1 = new Point2D.Float(); _rightArrowPoint2 = new Point2D.Float(); _temp = new Point2D.Float(); _arrowTransform = new AffineTransform(); } /** * Sets the Selected attribute of the RelationLine object * * @param isSelected The new Selected value */ public void setSelected(boolean isSelected) { _isSelected = isSelected; } /** * Gets the Selected attribute of the RelationLine object * * @return The Selected value */ public boolean isSelected() { return _isSelected; } /** * Updates all coordinates * * @todo Optimise. Some info can be cached * @todo Handle m:n (leftY/rightY etc) */ public void update() { /* * int leftY = _leftTable.getY() + _leftTable.getColumnY(_leftRole.getColumnMap().getPrimaryKey()); * int rightY; * if (!_leftRole.getRelation().isMany2Many()) { * rightY = _rightTable.getY() + _rightTable.getColumnY(_leftRole.getColumnMap().getForeignKey()); * } * else { * rightY = _rightTable.getY() + _rightTable.getColumnY(_rightRole.getColumnMap().getPrimaryKey()); * } */ int leftY = _leftTable.getY() + _leftColumnY; int rightY = _rightTable.getY() + _rightColumnY; // find out which table is farthest west (and east) JTablePanel westTable; JTablePanel eastTable; int westY; int eastY; Line2D.Float[] westLines; Line2D.Float[] eastLines; int[] westEdgeY; int[] eastEdgeY; _leftIsWest = _leftTable.getX() < _rightTable.getX(); if (_leftIsWest) { westTable = _leftTable; eastTable = _rightTable; westY = leftY; eastY = rightY; westLines = _leftLines; eastLines = _rightLines; westEdgeY = _leftEdgeY; eastEdgeY = _rightEdgeY; } else { westTable = _rightTable; eastTable = _leftTable; westY = rightY; eastY = leftY; westLines = _rightLines; eastLines = _leftLines; westEdgeY = _rightEdgeY; eastEdgeY = _leftEdgeY; } // find out whether the tables are more or less vertically aligned boolean aligned = (eastTable.getX() - westTable.getX()) < eastTable.getWidth() / 2; // TODO: handle different widths int westX; if (aligned) { westX = westTable.getX() - 10; for (int i = 0; i < westEdgeY.length; i++) { westLines[i].setLine(westX, westY, westTable.getX(), westEdgeY[i] + westTable.getY()); } } else { westX = westTable.getX() + westTable.getWidth() + 10; for (int i = 0; i < westEdgeY.length; i++) { westLines[i].setLine( westX, westY, westTable.getX() + westTable.getWidth(), westEdgeY[i] + westTable.getY()); } } int eastX = eastTable.getX() - 10; for (int i = 0; i < eastEdgeY.length; i++) { eastLines[i].setLine(eastX, eastY, eastTable.getX(), eastEdgeY[i] + eastTable.getY()); } _mainLine.setLine(westX, westY, eastX, eastY); setCardinalityPoints(); } /** * Describe what the method does * * @todo-javadoc Write javadocs for method * @todo-javadoc Write javadocs for method parameter * @param g Describe what the parameter does */ public void paint(Graphics2D g) { g.setRenderingHints(_renderHints); /* * if( isSelected() ) { * g.setColor( Color.red ); * } else { * g.setColor( Color.black ); * } */ if (_leftRole.getRelation().isMany2Many()) { g.setStroke(_dashedStroke); } else { g.setStroke(_regularStroke); } drawLineUnlessItsLengthIsZero(g, _mainLine); g.setStroke(_regularStroke); for (int i = 0; i < _leftLines.length; i++) { drawLineUnlessItsLengthIsZero(g, _leftLines[i]); } for (int i = 0; i < _rightLines.length; i++) { drawLineUnlessItsLengthIsZero(g, _rightLines[i]); } drawImage( g, getDisplayImage(_rightRole, g.getColor()), _leftCardinalityPoint.x - 8, _leftCardinalityPoint.y - 8); drawImage( g, getDisplayImage(_leftRole, g.getColor()), _rightCardinalityPoint.x - 8, _rightCardinalityPoint.y - 8); if (_rightRole.isEnabled()) { drawLineUnlessItsLengthIsZero(g, _leftArrowLine1); drawLineUnlessItsLengthIsZero(g, _leftArrowLine2); } if (_leftRole.isEnabled()) { drawLineUnlessItsLengthIsZero(g, _rightArrowLine1); drawLineUnlessItsLengthIsZero(g, _rightArrowLine2); } // draw the fk image if (!_leftRole.isOriginPrimaryKey()) { drawImage(g, _fk, _leftFkPoint.x - 6, _leftFkPoint.y - 6); } if (!_rightRole.isOriginPrimaryKey()) { drawImage(g, _fk, _rightFkPoint.x - 6, _rightFkPoint.y - 6); } } /** * @todo Refactor this. Shouldn't mix localisation logic and relation mutation logic in one method * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for return value * @todo-javadoc Write javadocs for method parameter * @param evt Describe what the parameter does * @return Describe the return value */ public boolean selectMaybe(MouseEvent evt) { boolean multiplicity = evt.isControlDown(); boolean cardinality = evt.isShiftDown(); Point point = evt.getPoint(); setSelected(_mainLine.intersects(point.getX() - 5, point.getY() - 5, 10, 10)); if (isSelected()) { double distFromP1 = Point2D.distance(_mainLine.getX1(), _mainLine.getY1(), point.getX(), point.getY()); boolean nearP1 = distFromP1 < _mainLength / 2; boolean leftChosen = (_leftIsWest && nearP1) || (!_leftIsWest && !nearP1); RelationshipRole role = leftChosen ? _rightRole : _leftRole; if (multiplicity) { // toggle multiplicity. Let's prevent the user from doing something stupid. Some // cardinalities // can't be changed. we know best etc. if (role.getRelation().isMany2Many()) { // don't allow to change cardinality of m:n relationships JOptionPane.showMessageDialog( null, "Can't change the cardinality of a many-to-many relationship", "Cardinality", JOptionPane.INFORMATION_MESSAGE); return false; } if (role.isFkPk()) { // don't allow to change cardinality of 1:1 relationships that are 1:1 because fk is also // pk JOptionPane.showMessageDialog( null, "Can't change the cardinality of a one-to-one relationship where the foreign key is also a primary key", "Cardinality", JOptionPane.INFORMATION_MESSAGE); return false; } if (role.isTargetPrimaryKey()) { JOptionPane.showMessageDialog( null, "Can't change the cardinality of a the one-side of a relationship that corresponds to a primary key", "Cardinality", JOptionPane.INFORMATION_MESSAGE); return false; } // All checks passed. Do the toggle role.setTargetMany(!role.isTargetMany()); } if (cardinality) { // toggle between uni/bidirectional role.setEnabled(!role.isEnabled()); } return true; } else { return false; } } /** * Sets the CardinalityPoints attribute of the RelationLine object * * @todo refactor this duplicate code!!! */ private void setCardinalityPoints() { // compute vector of length 1 _mainLength = Point2D.distance( _mainLine.getX1(), _mainLine.getY1(), _mainLine.getX2(), _mainLine.getY2()); double vx = (_mainLine.getX2() - _mainLine.getX1()) / _mainLength; double vy = (_mainLine.getY2() - _mainLine.getY1()) / _mainLength; double cardx = 20.0 * vx; double cardy = 20.0 * vy; double arrowx = 30.0 * vx; double arrowy = 30.0 * vy; if (_leftIsWest) { _leftArrowPoint.setLocation(_mainLine.getX1() + cardx, _mainLine.getY1() + cardy); _rightArrowPoint.setLocation(_mainLine.getX2() - cardx, _mainLine.getY2() - cardy); // The left-side arrow head _temp.setLocation(_mainLine.getX1() + arrowx, _mainLine.getY1() + arrowy); _arrowTransform.setToRotation(Math.PI / 6, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftArrowPoint1); _leftArrowLine1.setLine( _leftArrowPoint.getX(), _leftArrowPoint.getY(), _leftArrowPoint1.getX(), _leftArrowPoint1.getY()); _arrowTransform.setToRotation(-Math.PI / 6, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftArrowPoint2); _leftArrowLine2.setLine( _leftArrowPoint.getX(), _leftArrowPoint.getY(), _leftArrowPoint2.getX(), _leftArrowPoint2.getY()); _arrowTransform.setToRotation(Math.PI / 2, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftCardinalityPoint); _arrowTransform.setToRotation(-Math.PI / 2, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftFkPoint); // The right-side arrow head _temp.setLocation(_mainLine.getX2() - arrowx, _mainLine.getY2() - arrowy); _arrowTransform.setToRotation(Math.PI / 6, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightArrowPoint1); _rightArrowLine1.setLine( _rightArrowPoint.getX(), _rightArrowPoint.getY(), _rightArrowPoint1.getX(), _rightArrowPoint1.getY()); _arrowTransform.setToRotation(-Math.PI / 6, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightArrowPoint2); _rightArrowLine2.setLine( _rightArrowPoint.getX(), _rightArrowPoint.getY(), _rightArrowPoint2.getX(), _rightArrowPoint2.getY()); _arrowTransform.setToRotation(-Math.PI / 2, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightCardinalityPoint); _arrowTransform.setToRotation(Math.PI / 2, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightFkPoint); } else { _leftArrowPoint.setLocation(_mainLine.getX2() - cardx, _mainLine.getY2() - cardy); _rightArrowPoint.setLocation(_mainLine.getX1() + cardx, _mainLine.getY1() + cardy); // The left-side arrow head _temp.setLocation(_mainLine.getX2() - arrowx, _mainLine.getY2() - arrowy); _arrowTransform.setToRotation(Math.PI / 6, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftArrowPoint1); _leftArrowLine1.setLine( _leftArrowPoint.getX(), _leftArrowPoint.getY(), _leftArrowPoint1.getX(), _leftArrowPoint1.getY()); _arrowTransform.setToRotation(-Math.PI / 6, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftArrowPoint2); _leftArrowLine2.setLine( _leftArrowPoint.getX(), _leftArrowPoint.getY(), _leftArrowPoint2.getX(), _leftArrowPoint2.getY()); _arrowTransform.setToRotation(Math.PI / 2, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftCardinalityPoint); _arrowTransform.setToRotation(-Math.PI / 2, _leftArrowPoint.getX(), _leftArrowPoint.getY()); _arrowTransform.transform(_temp, _leftFkPoint); // The right-side arrow head _temp.setLocation(_mainLine.getX1() + arrowx, _mainLine.getY1() + arrowy); _arrowTransform.setToRotation(Math.PI / 6, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightArrowPoint1); _rightArrowLine1.setLine( _rightArrowPoint.getX(), _rightArrowPoint.getY(), _rightArrowPoint1.getX(), _rightArrowPoint1.getY()); _arrowTransform.setToRotation(-Math.PI / 6, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightArrowPoint2); _rightArrowLine2.setLine( _rightArrowPoint.getX(), _rightArrowPoint.getY(), _rightArrowPoint2.getX(), _rightArrowPoint2.getY()); _arrowTransform.setToRotation(-Math.PI / 2, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightCardinalityPoint); _arrowTransform.setToRotation(Math.PI / 2, _rightArrowPoint.getX(), _rightArrowPoint.getY()); _arrowTransform.transform(_temp, _rightFkPoint); } } /** * Gets the cardinality Image to display. It's a 1 or a *, black or blue. * * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @param role Describe what the parameter does * @param c Describe what the parameter does * @return The LeftDisplayString value */ private Image getDisplayImage(RelationshipRole role, Color c) { // This is quite dirty, but it works if (c == Color.white) { return role.isTargetMany() ? _star_white : _one_white; } else { return role.isTargetMany() ? _star : _one; } } /** * Describe what the method does * * @todo-javadoc Write javadocs for method * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @param g Describe what the parameter does * @param i Describe what the parameter does * @param x Describe what the parameter does * @param y Describe what the parameter does */ private final void drawImage(final Graphics2D g, final Image i, final float x, final float y) { if (!Float.isNaN(x)) { g.drawImage(i, (int) x, (int) y, null); } } /** * Describe what the method does * * @todo-javadoc Write javadocs for method * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for method parameter * @param g Describe what the parameter does * @param line Describe what the parameter does */ private final void drawLineUnlessItsLengthIsZero(final Graphics2D g, final Line2D line) { // Any coord is NaN if the length is zero if (!Double.isNaN(line.getP1().getX())) { g.draw(line); } } /** * Describe what the method does * * @todo-javadoc Write javadocs for method * @todo-javadoc Write javadocs for method parameter * @todo-javadoc Write javadocs for return value * @param n Describe what the parameter does * @return Describe the return value */ private static Line2D.Float[] createLines(int n) { Line2D.Float[] result = new Line2D.Float[n]; for (int i = 0; i < n; i++) { result[i] = new Line2D.Float(); } return result; } static { _renderHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); _renderHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); } }
/**
* Creates new RelationLine
*
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for method parameter
* @todo-javadoc Write javadocs for method parameter
* @param leftRole Describe what the parameter does
* @param rightRole Describe what the parameter does
* @param leftTable Describe what the parameter does
* @param rightTable Describe what the parameter does
*/
public RelationLine(
RelationshipRole leftRole,
RelationshipRole rightRole,
JTablePanel leftTable,
JTablePanel rightTable) {
_log.debug(
"new RelationLine for "
+ leftTable.getTable().getSqlName()
+ "-"
+ rightTable.getTable().getSqlName());
_leftRole = leftRole;
_rightRole = rightRole;
_leftTable = leftTable;
_rightTable = rightTable;
// left table points
_log.debug("A:" + _leftRole.getColumnMaps().length);
_leftEdgeY = new int[_leftRole.getColumnMaps().length];
for (int i = 0; i < _leftEdgeY.length; i++) {
_leftEdgeY[i] = _leftTable.getColumnY(_leftRole.getColumnMaps()[i].getPrimaryKey());
_leftColumnY += _leftEdgeY[i];
}
_leftColumnY = _leftColumnY / _leftEdgeY.length;
// right table points
if (!_leftRole.getRelation().isMany2Many()) {
_log.debug("M:" + _leftRole.getColumnMaps().length);
_rightEdgeY = new int[_leftRole.getColumnMaps().length];
for (int i = 0; i < _rightEdgeY.length; i++) {
_rightEdgeY[i] = _rightTable.getColumnY(_leftRole.getColumnMaps()[i].getForeignKey());
_rightColumnY += _rightEdgeY[i];
}
_rightColumnY = _rightColumnY / _rightEdgeY.length;
} else {
_log.debug("B:" + _rightRole.getColumnMaps().length);
_rightEdgeY = new int[_rightRole.getColumnMaps().length];
for (int i = 0; i < _rightEdgeY.length; i++) {
_rightEdgeY[i] = _rightTable.getColumnY(_rightRole.getColumnMaps()[i].getPrimaryKey());
_rightColumnY += _rightEdgeY[i];
}
_rightColumnY = _rightColumnY / _rightRole.getColumnMaps().length;
}
_leftLines = createLines(_leftEdgeY.length);
_rightLines = createLines(_rightEdgeY.length);
_mainLine = new Line2D.Float();
_leftCardinalityPoint = new Point2D.Float();
_rightCardinalityPoint = new Point2D.Float();
_leftFkPoint = new Point2D.Float();
_rightFkPoint = new Point2D.Float();
_leftArrowPoint = new Point2D.Float();
_rightArrowPoint = new Point2D.Float();
_leftArrowLine1 = new Line2D.Float();
_leftArrowLine2 = new Line2D.Float();
_rightArrowLine1 = new Line2D.Float();
_rightArrowLine2 = new Line2D.Float();
_leftArrowPoint1 = new Point2D.Float();
_leftArrowPoint2 = new Point2D.Float();
_rightArrowPoint1 = new Point2D.Float();
_rightArrowPoint2 = new Point2D.Float();
_temp = new Point2D.Float();
_arrowTransform = new AffineTransform();
}
