/*
* Shamelessly stolen from qml-box2d project at gitorious
*
* https://gitorious.org/qml-box2d/qml-box2d
*/
void Box2DBaseItem::synchronize()
{
if (m_synchronize && m_initialized) {
m_synchronizing = true;
const QPointF newPoint = b2Util::qTopLeft(b2TransformOrigin(), boundingRect(), m_scaleRatio);
const qreal newRotation = b2Util::qAngle(b2Angle());
if (!qFuzzyCompare(x(), newPoint.x()) || !qFuzzyCompare(y(), newPoint.y()))
setPos(newPoint);
if (!qFuzzyCompare(rotation(), newRotation))
setRotation(newRotation);
m_synchronizing = false;
}
}
void Light::OnUpdate(sf::Time interval) {
std::lock_guard<std::recursive_mutex> lg(m_mutex);
if (!m_active || !m_render || !GetParent()->IsRender()) return;
sf::Vector2f pos = GetGlobalPosition();
const auto& view = m_scene->GetGame()->GetWindow()->getView();
auto vr = sf::FloatRect(view.getCenter().x - view.getSize().x / 2, view.getCenter().y - view.getSize().y / 2,
view.getSize().x,
view.getSize().y);
if (!vr.intersects(sf::Rect<float>(pos.x - m_radius, pos.y - m_radius, 2 * m_radius, 2 * m_radius))) {
m_blocked = true;
return;
}
b2AABB center;
center.lowerBound.x = pos.x / m_scene->GetPixelMeterRatio();
center.lowerBound.y = pos.y / m_scene->GetPixelMeterRatio();
float onep = (1.f / m_scene->GetPixelMeterRatio());
center.upperBound.x = center.lowerBound.x + onep;
center.upperBound.y = center.lowerBound.y + onep;
CenterQuery cq(center.lowerBound.x, center.lowerBound.y);
GetScene()->GetWorld()->QueryAABB(&cq, center);
if (cq.hit) {
cq.node->OnLightRay.Fire(this);
m_blocked = true;
return;
}
m_blocked = false;
float rayDistance =
(2 - cosf(m_openingAngle / (m_rayCount - 1))) * m_radius / m_scene->GetPixelMeterRatio();
b2Vec2 basePos(pos.x / m_scene->GetPixelMeterRatio(),
pos.y / m_scene->GetPixelMeterRatio());
struct edgeData {
b2Vec2 pos;
b2Fixture* fixture;
int vertex;
};
std::map<int, edgeData> edges;
auto EdgeFromPos = [&, this](const b2Vec2& p) -> edgeData* {
float angle = atan2f(basePos.y - p.y, basePos.x - p.x) + fPI;
if (angle > m_angle + m_openingAngle || angle < m_angle) {
return nullptr;
}
int i = static_cast<int>(angle / fPI * 180) % 360;
auto it = edges.find(i);
if (it == edges.end()) {
float r = m_radius / m_scene->GetPixelMeterRatio();
edgeData def{basePos + b2Vec2(r, r), nullptr, 0};
edges.insert(std::make_pair(i, def));
return &edges.find(i)->second;
}
return &it->second;
};
auto aabbCallback = engine::MakeAABBQueryCallback([&, this](b2Fixture* fixture) -> bool {
if (!fixture->GetBody()->GetUserData() ||
static_cast<Node*>(fixture->GetBody()->GetUserData())->IsOpaque())
return true;
if (fixture->GetShape()->GetType() == b2Shape::e_polygon) {
b2PolygonShape* shape = static_cast<b2PolygonShape*>(fixture->GetShape());
for (size_t i = 0; i < shape->GetVertexCount(); i++) {
const b2Vec2& vertex = shape->GetVertex(i);
b2Vec2 vertexPos = b2Mul(fixture->GetBody()->GetTransform(), vertex);
auto vLen = (vertexPos - basePos).Length();
if (vLen < m_radius / m_scene->GetPixelMeterRatio()) {
auto edge = EdgeFromPos(vertexPos);
if (!edge) continue;
// Is the vertex we found better
b2Vec2 dif = edge->pos - basePos;
if (vLen < dif.Length()) {
edge->pos = vertexPos;
}
edge->fixture = fixture;
edge->vertex = i;
}
}
}
return true;
});
b2AABB aabb;
aabb.lowerBound = b2Vec2((pos.x - m_radius) / m_scene->GetPixelMeterRatio(),
(pos.y - m_radius) / m_scene->GetPixelMeterRatio());
aabb.upperBound = b2Vec2((pos.x + m_radius) / m_scene->GetPixelMeterRatio(),
(pos.y + m_radius) / m_scene->GetPixelMeterRatio());
m_scene->GetWorld()->QueryAABB(&aabbCallback, aabb);
float step = m_openingAngle / static_cast<float> (m_rayCount - 1);
float angle = m_angle;
auto it = edges.begin();
m_vertices.resize(1); // keep the center vertex
float f = 1.0;
Node* hitNode = nullptr;
auto rayCastCallback = MakeRayCastCallback([&](b2Fixture* fixture, const b2Vec2& point,
const b2Vec2& normal, float32 fraction) {
Node* n = static_cast<Node*> (fixture->GetBody()->GetUserData());
if (n && !n->IsOpaque() && fraction < f) {
f = fraction;
hitNode = n;
}
return f;
});
sf::Vertex v;
float edgeAngle = 0;
v.position.x = cosf(angle) * m_radius;
v.position.y = sinf(angle) * m_radius;
f = 1.0;
m_scene->GetWorld()->RayCast(&rayCastCallback, basePos, basePos + b2Vec2(v.position.x /
m_scene->GetPixelMeterRatio(),
v.position.y /
m_scene->GetPixelMeterRatio()));
if (hitNode) hitNode->OnLightRay.Fire(this);
v.position.x *= f;
v.position.y *= f;
AssignLightColor(v, f, m_lightColor);
m_vertices.push_back(v);
angle += step;
for (size_t i = 2; i < m_rayCount + 1; i++, angle += step) {
bool had = false;
while (it != edges.end()) {
edgeAngle = b2Angle(basePos, it->second.pos);
if (edgeAngle < 0) edgeAngle += fPI * 2;
if (angle < edgeAngle || edgeAngle >= angle + step) {
break;
}
if (it->second.fixture == nullptr) {
++it;
continue;
}
f = 1.0;
m_scene->GetWorld()->RayCast(&rayCastCallback, basePos, it->second.pos);
// Check if this edge is blocked, skip if it is
if (f < 1.0 - 10.0f / m_radius) {
++it;
continue;
}
if (hitNode) hitNode->OnLightRay.Fire(this);
had = true;
float edgeLengthPct =
m_scene->MeterToPixel((basePos - it->second.pos).Length()) / m_radius + (10.0f / m_radius);
auto addPoint = [&, this](b2Vec2 point) {
v.position.x = m_scene->MeterToPixel(point.x) - pos.x;
v.position.y = m_scene->MeterToPixel(point.y) - pos.y;
f = sqrtf(v.position.x * v.position.x + v.position.y * v.position.y) / m_radius;
AssignLightColor(v, f, m_lightColor);
m_vertices.push_back(v);
};
// Check surrounding edges by using half a degree differences
float checkAngle = edgeAngle - (fPI / 840.f);
if (checkAngle > 0) {
f = 1.0;
b2Vec2 edge = b2Vec2(cosf(edgeAngle - (fPI / 840.f)),
sinf(edgeAngle - (fPI / 840.f)));
edge *= (m_radius / m_scene->GetPixelMeterRatio());
edge += basePos;
m_scene->GetWorld()->RayCast(&rayCastCallback, basePos, edge);
if (f > edgeLengthPct) {
b2Vec2 p = (basePos - edge);
p *= -f;
addPoint(basePos + p);
}
}
addPoint(it->second.pos);
f = 1.0;
checkAngle = edgeAngle + (fPI / 840.f);
if (checkAngle < fPI * 2) {
b2Vec2 edge =
b2Vec2(cosf(checkAngle),
sinf(checkAngle));
edge *= (m_radius / m_scene->GetPixelMeterRatio());
edge += basePos;
m_scene->GetWorld()->RayCast(&rayCastCallback, basePos, edge);
if (f > edgeLengthPct) {
b2Vec2 p = (basePos - edge);
p *= -f;
addPoint(basePos + p);
}
}
++it;
}
// Prevent overlapping rays
if (!had || had && !floatEqual(edgeAngle, angle, fPI / 180.0f) || i == 1 ||
i == m_rayCount) {
v.position.x = cosf(angle) * m_radius;
v.position.y = sinf(angle) * m_radius;
f = 1.0;
m_scene->GetWorld()->RayCast(&rayCastCallback, basePos, basePos + b2Vec2(v.position.x /
m_scene->GetPixelMeterRatio(),
v.position.y /
m_scene->GetPixelMeterRatio()));
if (hitNode) hitNode->OnLightRay.Fire(this);
v.position.x *= f;
v.position.y *= f;
AssignLightColor(v, f, m_lightColor);
m_vertices.push_back(v);
}
}
}