/**
* 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);
}
}
