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Florian Rival
59 lines
1.8 KiB
C++
59 lines
1.8 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 <iostream>
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#include "Box2D/Box2D.h"
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#include "ContactListener.h"
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#include "GDCpp/Runtime/Serialization/SerializerElement.h"
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#include "ScenePhysicsDatas.h"
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RuntimeScenePhysicsDatas::RuntimeScenePhysicsDatas(
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const gd::SerializerElement& behaviorSharedDataContent)
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: BehaviorsRuntimeSharedData(behaviorSharedDataContent),
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world(new b2World(
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b2Vec2(behaviorSharedDataContent.GetDoubleAttribute("gravityX"),
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-behaviorSharedDataContent.GetDoubleAttribute("gravityY")),
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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(behaviorSharedDataContent.GetDoubleAttribute("scaleX")),
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scaleY(behaviorSharedDataContent.GetDoubleAttribute("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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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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totalTime += dt;
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if (totalTime > fixedTimeStep) {
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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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world->Step(fixedTimeStep, v, p);
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world->ClearForces();
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}
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}
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}
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RuntimeScenePhysicsDatas::~RuntimeScenePhysicsDatas() {
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delete world;
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delete contactListener;
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}
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