bool Label::update(const glm::mat4& _mvp, const glm::vec2& _screenSize, float _zoomFract) {
if (m_state == State::dead) {
return false;
}
m_occluded = false;
bool ruleSatisfied = updateScreenTransform(_mvp, _screenSize, true);
// one of the label rules has not been satisfied
if (!ruleSatisfied) {
if (m_state == State::wait_occ) {
// go to dead state, this breaks determinism, but reduce potential
// label set since a lot of discarded labels are discared for line
// exceed (lots of tiny small lines on a curve for example), which
// won't have their rule satisfied
enterState(State::dead, 0.0);
pushTransform();
} else {
enterState(State::sleep, 0.0);
pushTransform();
}
return false;
}
// update the view-space bouding box
updateBBoxes(_zoomFract);
// checks whether the label is out of the viewport
if (offViewport(_screenSize)) {
enterState(State::out_of_screen, 0.0);
}
return true;
}
bool Label::updateState(const glm::mat4& _mvp, const glm::vec2& _screenSize, float _dt, float _zoomFract) {
if (m_currentState == State::dead) {
return false;
}
bool occludedLastFrame = m_occludedLastFrame;
m_occludedLastFrame = false;
bool ruleSatisfied = updateScreenTransform(_mvp, _screenSize);
// one of the label rules has not been satisfied
if (!ruleSatisfied) {
// go to dead state, this breaks determinism, but reduce potential label set since a lot
// of discarded labels are discared for line exceed (lots of tiny small lines on a curve
// for example), which won't have their rule satisfied
enterState(State::dead, 0.0);
return false;
}
// update the view-space bouding box
updateBBoxes(_zoomFract);
// checks whether the label is out of the viewport
if (offViewport(_screenSize)) {
enterState(State::out_of_screen, 0.0);
}
bool animate = false;
switch (m_currentState) {
case State::visible:
if (occludedLastFrame) {
m_fade = FadeEffect(false, m_options.hideTransition.ease, m_options.hideTransition.time);
enterState(State::fading_out, 1.0);
}
break;
case State::fading_in:
if (occludedLastFrame) {
enterState(State::sleep, 0.0);
break;
}
setAlpha(m_fade.update(_dt));
animate = true;
if (m_fade.isFinished()) {
enterState(State::visible, 1.0);
}
break;
case State::fading_out:
setAlpha(m_fade.update(_dt));
animate = true;
if (m_fade.isFinished()) {
enterState(State::sleep, 0.0);
}
break;
case State::out_of_screen:
if (!offViewport(_screenSize)) {
enterState(State::wait_occ, 0.0);
}
break;
case State::wait_occ:
if (m_occlusionSolved) {
if (occludedLastFrame) {
enterState(State::dead, 0.0); // dead
} else {
m_fade = FadeEffect(true, m_options.showTransition.ease, m_options.showTransition.time);
enterState(State::fading_in, 0.0);
}
}
break;
case State::sleep:
if (!occludedLastFrame) {
m_fade = FadeEffect(true, m_options.showTransition.ease, m_options.showTransition.time);
enterState(State::fading_in, 0.0);
}
break;
case State::dead:
break;
}
return animate;
}
bool Label::evalState(const glm::vec2& _screenSize, float _dt) {
bool animate = false;
switch (m_state) {
case State::visible:
if (m_occluded) {
m_fade = FadeEffect(false, m_options.hideTransition.ease,
m_options.hideTransition.time);
enterState(State::fading_out, 1.0);
animate = true;
}
break;
case State::fading_in:
if (m_occluded) {
enterState(State::sleep, 0.0);
// enterState(State::fading_out, m_transform.state.alpha);
// animate = true;
break;
}
setAlpha(m_fade.update(_dt));
animate = true;
if (m_fade.isFinished()) {
enterState(State::visible, 1.0);
}
break;
case State::fading_out:
setAlpha(m_fade.update(_dt));
animate = true;
if (m_fade.isFinished()) {
enterState(State::sleep, 0.0);
}
break;
case State::out_of_screen:
if (!offViewport(_screenSize)) {
enterState(State::wait_occ, 0.0);
}
break;
case State::wait_occ:
if (m_occluded) {
enterState(State::dead, 0.0);
} else {
m_fade = FadeEffect(true, m_options.showTransition.ease,
m_options.showTransition.time);
enterState(State::fading_in, 0.0);
animate = true;
}
break;
case State::skip_transition:
if (m_occluded) {
enterState(State::dead, 0.0);
} else {
enterState(State::visible, 1.0);
}
break;
case State::sleep:
if (!m_occluded) {
m_fade = FadeEffect(true, m_options.showTransition.ease,
m_options.showTransition.time);
enterState(State::fading_in, 0.0);
animate = true;
}
break;
case State::dead:
break;
}
m_occludedLastFrame = m_occluded;
m_occluded = false;
return animate;
}
