/** {@inheritDoc} */
protected void applyDelegateOwner(Object owner) {
if (this.rings == null) return;
for (SurfaceCircle ring : this.rings) {
ring.setDelegateOwner(owner);
}
}
/** {@inheritDoc} */
public void preRender(DrawContext dc) {
if (!this.isVisible()) {
return;
}
if (this.rings == null) {
this.createShapes(dc);
}
this.determineActiveAttributes();
for (SurfaceCircle ring : this.rings) {
ring.preRender(dc);
}
}
/** {@inheritDoc} */
@Override
protected void determineLabelPositions(DrawContext dc) {
Position center = this.getReferencePosition();
if (center == null) return;
// Position the labels along a line radiating out from the center of the circle. The angle (60
// degrees) is
// chosen to match the graphic template defined by MIL-STD-2525C, pg. 613.
double globeRadius = dc.getGlobe().getRadius();
Angle labelAngle = this.getLabelAngle();
int i = 0;
for (SurfaceCircle ring : this.rings) {
double radius = ring.getRadius();
LatLon ll = LatLon.greatCircleEndPosition(center, labelAngle.radians, radius / globeRadius);
this.labels.get(i).setPosition(new Position(ll, 0));
i += 1;
}
}
/**
* 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);
}
}
/**
* Create a circle for a range ring.
*
* @return New circle.
*/
protected SurfaceCircle createCircle() {
SurfaceCircle circle = new SurfaceCircle();
circle.setDelegateOwner(this.getActiveDelegateOwner());
circle.setAttributes(this.getActiveShapeAttributes());
return circle;
}
/**
* Render the polygon.
*
* @param dc Current draw context.
*/
protected void doRenderGraphic(DrawContext dc) {
for (SurfaceCircle ring : this.rings) {
ring.render(dc);
}
}
