protected void computeQuadSize(DrawContext dc) {
if (this.positions == null) return;
Iterator<? extends Position> iterator = this.positions.iterator();
Position pos1 = iterator.next();
Position pos2 = iterator.next();
Angle angularDistance = LatLon.greatCircleDistance(pos1, pos2);
double length = angularDistance.radians * dc.getGlobe().getRadius();
this.quad.setWidth(length);
}
protected List<Position> computePathPositions(
Position startPosition, Position endPosition, Angle delta) {
Angle dist = LatLon.greatCircleDistance(startPosition, endPosition);
dist = dist.multiply(0.6);
Angle azimuth = LatLon.greatCircleAzimuth(startPosition, endPosition);
LatLon locA = LatLon.greatCircleEndPosition(startPosition, azimuth.add(delta), dist);
dist = dist.multiply(0.9);
LatLon locB = LatLon.greatCircleEndPosition(startPosition, azimuth.subtract(delta), dist);
return Arrays.asList(startPosition, new Position(locA, 0), new Position(locB, 0), endPosition);
}
/**
* Create the circles used to draw this graphic.
*
* @param dc Current draw context.
*/
protected void createShapes(DrawContext dc) {
if (this.positions == null) return;
this.rings = new ArrayList<SurfaceCircle>();
Iterator<? extends Position> iterator = this.positions.iterator();
Position center = iterator.next();
double globeRadius = dc.getGlobe().getRadius();
while (iterator.hasNext()) {
SurfaceCircle ring = this.createCircle();
ring.setCenter(center);
Position pos = iterator.next();
Angle radius = LatLon.greatCircleDistance(center, pos);
double radiusMeters = radius.radians * globeRadius;
ring.setRadius(radiusMeters);
this.rings.add(ring);
}
}