Examples with PolarPoint org.csstudio.swt.widgets.figureparts.PolarPoint used on opensource projects

Example 1 with PolarPoint

use of org.csstudio.swt.widgets.figureparts.PolarPoint in project yamcs-studio by yamcs.

the class PolylineFigure method calcArrowPoints.

/**
 * Calculate the three points for an arrow.
 *
 * @param startPoint
 *            the start point of the line
 * @param endPoint
 *            the end point of the line
 * @param l
 *            the length of the arrow line
 * @param angle
 *            the radians angle between the line and the arrow line.
 * @return A point list which includes the three points: <br>
 *         0: Right arrow point; <br>
 *         1: Left arrow point; <br>
 *         2: Intersection point.
 */
public static PointList calcArrowPoints(Point startPoint, Point endPoint, int l, double angle) {
    PointList result = new PointList();
    PolarPoint ppE = PolarPoint.point2PolarPoint(endPoint, startPoint);
    PolarPoint ppR = new PolarPoint(l, ppE.theta - angle);
    PolarPoint ppL = new PolarPoint(l, ppE.theta + angle);
    // the intersection point bettwen arrow and line.
    PolarPoint ppI = new PolarPoint((int) (l * Math.cos(angle)), ppE.theta);
    Point pR = ppR.toPoint().translate(endPoint);
    Point pL = ppL.toPoint().translate(endPoint);
    Point pI = ppI.toPoint().translate(endPoint);
    result.addPoint(pR);
    result.addPoint(pL);
    result.addPoint(pI);
    return result;
}