@Override
protected void onDraw(Canvas canvas) {
if (canvas == null) return;
if (drawing.compareAndSet(false, true)) {
List<Marker> collection = ARData.getMarkers();
cache.clear();
for (Marker m : collection) {
m.update(canvas, 0, 0);
if (m.isOnRadar()) cache.add(m);
cache.add(m);
}
collection = cache;
if (AugmentedActivity.useCollisionDetection) adjustForCollisions(canvas, collection);
ListIterator<Marker> iter = collection.listIterator(collection.size());
while (iter.hasPrevious()) {
Marker marker = iter.previous();
marker.draw(canvas);
}
if (AugmentedActivity.showRadar) radar.draw(canvas);
drawing.set(false);
}
}
private static void adjustForCollisions(Canvas canvas, List<Marker> collection) {
updated.clear();
for (Marker marker1 : collection) {
if (updated.contains(marker1) || !marker1.isInView()) continue;
int collisions = 1;
for (Marker marker2 : collection) {
if (marker1.equals(marker2) || updated.contains(marker2) || !marker2.isInView()) continue;
if (marker1.isMarkerOnMarker(marker2)) {
marker2.getLocation().get(locationArray);
float y = locationArray[1];
float h = collisions * COLLISION_ADJUSTMENT;
locationArray[1] = y + h;
marker2.getLocation().set(locationArray);
marker2.update(canvas, 0, 0);
collisions++;
updated.add(marker2);
}
}
updated.add(marker1);
}
}