Problem with the anchor point of Military Symbology and NullPointerException when SPEED_LEADER_SCALE is not set

[nebsar]

Description

1. When direction of movement arrow is added to Military Symbol, symbols with ground heading indicator has wrong anchor point. Because of this, when earth is rotated the symbol's direction of movement shows offset.

SOLUTION: Inside the MilStd2525TacticalSymbol class, at line 547, we need to add the following code:

if (this.useGroundHeadingIndicator) {
    List<? extends Point2D> points = MilStd2525Util.computeGroundHeadingIndicatorPoints(dc, osym.placePoint,
                   (Angle) o, length, this.iconRect.getHeight(), directionOnly);
    if (directionOnly) {
        this.addLine(dc, Offset.BOTTOM_CENTER, points, LAYOUT_RELATIVE, points.size() - 4, osym);
    } else {
        this.addLine(dc, Offset.BOTTOM_CENTER, points, LAYOUT_RELATIVE, points.size() - 1, osym);
    }
}

2. When SPEED_LEADER_SCALE is not set NullPointerException is get.

SOLUTION: Inside the MilStd2525TacticalSymbol class, at line 543, we need to add curly brackets to if clause as below:

if (d != null && d instanceof Number) {
    directionOnly = false;
    length *= ((Number) d).doubleValue();
}

[ComBatVision]

Create pull-request please.