closed #5537: add test case

tests/cpp-tests/Classes/PhysicsTest/PhysicsTest.cpp

@@ -21,6 +21,7 @@ namespace
         CL(PhysicsPositionRotationTest),
         CL(PhysicsSetGravityEnableTest),
         CL(Bug5482),
+        CL(PhysicsFixedUpdate),
 #else
         CL(PhysicsDemoDisabled),
 #endif
@@ -1725,4 +1726,60 @@ std::string Bug5482::subtitle() const
     return "change physics body to the other.";
 }
 
+void PhysicsFixedUpdate::onEnter()
+{
+    PhysicsDemo::onEnter();
+    
+    _scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);
+    _scene->getPhysicsWorld()->setGravity(Point::ZERO);
+    
+    // wall
+    auto wall = Node::create();
+    wall->setPhysicsBody(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1, 0.0f)));
+    wall->setPosition(VisibleRect::center());
+    this->addChild(wall);
+    
+    addBall();
+    
+    scheduleOnce(schedule_selector(PhysicsFixedUpdate::updateStart), 2);
+}
+
+void PhysicsFixedUpdate::addBall()
+{
+    auto ball = Sprite::create("Images/ball.png");
+    ball->setPosition(100, 100);
+    ball->setPhysicsBody(PhysicsBody::createCircle(ball->getContentSize().width/2, PhysicsMaterial(0.1f, 1, 0.0f)));
+    ball->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
+    ball->getPhysicsBody()->setVelocity(Point(1000, 20));
+    this->addChild(ball);
+}
+
+void PhysicsFixedUpdate::updateStart(float delta)
+{
+    addBall();
+    
+    _scene->getPhysicsWorld()->setAutoStep(false);
+    scheduleUpdate();
+}
+
+void PhysicsFixedUpdate::update(float delta)
+{
+    
+    // use fixed time and calculate 3 times per frame makes physics simulate more precisely.
+    for (int i = 0; i < 3; ++i)
+    {
+        _scene->getPhysicsWorld()->step(1/180.0f);
+    }
+}
+
+std::string PhysicsFixedUpdate::title() const
+{
+    return "Fixed Update Test";
+}
+
+std::string PhysicsFixedUpdate::subtitle() const
+{
+    return "The secend ball should not run across the wall";
+}
+
 #endif // ifndef CC_USE_PHYSICS

tests/cpp-tests/Classes/PhysicsTest/PhysicsTest.h

@@ -255,6 +255,18 @@ private:
     bool _bodyInA;
 };
 
+class PhysicsFixedUpdate : public PhysicsDemo
+{
+public:
+    CREATE_FUNC(PhysicsFixedUpdate);
+    void onEnter() override;
+    void updateStart(float delta);
+    void addBall();
+    virtual void update(float delta) override;
+    virtual std::string title() const override;
+    virtual std::string subtitle() const override;
+};
+
 
 #endif
 #endif