private void updatePreviousProportions(Face face) {
for (Landmark landmark : face.getLandmarks()) {
PointF position = landmark.getPosition();
float xProp = (position.x - face.getPosition().x) / face.getWidth();
float yProp = (position.y - face.getPosition().y) / face.getHeight();
mPreviousProportions.put(landmark.getType(), new PointF(xProp, yProp));
}
}
/**
* Finds a specific landmark position, or approximates the position based on past observations if
* it is not present.
*/
private PointF getLandmarkPosition(Face face, int landmarkId) {
for (Landmark landmark : face.getLandmarks()) {
if (landmark.getType() == landmarkId) {
return landmark.getPosition();
}
}
PointF prop = mPreviousProportions.get(landmarkId);
if (prop == null) {
return null;
}
float x = face.getPosition().x + (prop.x * face.getWidth());
float y = face.getPosition().y + (prop.y * face.getHeight());
return new PointF(x, y);
}