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Florian Rival
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
/**
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GDevelop - Physics Behavior Extension
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Copyright (c) 2010-2016 Florian Rival (Florian.Rival@gmail.com)
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This project is released under the MIT License.
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*/
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#include "RuntimeScenePhysicsDatas.h"
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#include "ScenePhysicsDatas.h"
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#include "ContactListener.h"
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#include "Box2D/Box2D.h"
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#include <iostream>
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RuntimeScenePhysicsDatas::RuntimeScenePhysicsDatas(const ScenePhysicsDatas & behaviorSharedDatas) :
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world(new b2World(b2Vec2(behaviorSharedDatas.gravityX, -behaviorSharedDatas.gravityY), true)),
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contactListener(new ContactListener),
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staticBody(NULL),
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stepped(false),
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scaleX(behaviorSharedDatas.scaleX),
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scaleY(behaviorSharedDatas.scaleY),
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invScaleX(1/scaleX),
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invScaleY(1/scaleY),
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fixedTimeStep(1.f / 60.f),
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maxSteps(5),
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totalTime (0)
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{
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world->SetContactListener(contactListener);
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world->SetAutoClearForces(false);
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b2BodyDef bodyWithoutFixture;
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staticBody = world->CreateBody(&bodyWithoutFixture);
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}
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void RuntimeScenePhysicsDatas::StepWorld(float dt, int v, int p)
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{
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totalTime += dt;
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if(totalTime > fixedTimeStep)
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{
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std::size_t numberOfSteps(std::floor(totalTime / fixedTimeStep));
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totalTime -= numberOfSteps * fixedTimeStep;
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std::size_t numberOfStepToProcess = std::min(numberOfSteps, maxSteps);
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for(std::size_t a = 0; a < numberOfStepToProcess; a++)
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{
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world->Step(fixedTimeStep, v, p);
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world->ClearForces();
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}
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}
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//Old method
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/*world->Step(dt, v, p);
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world->ClearForces();*/
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}
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RuntimeScenePhysicsDatas::~RuntimeScenePhysicsDatas()
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{
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delete world;
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delete contactListener;
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}
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