Hi,
I'm working with SFML and Box2D for physics, the problem is that I'm not able to move the body that I created, I'm using the function ApplyLinearImpulse in order to move the body, but it does not seem to be working, I would greatly appreciate some help with this. Here is my code:
namespace sfdd
{
const float SCALE = 32.f;
}
int main(int argc, char** argv)
{
//Setup SFML
sf::RenderWindow window(sf::VideoMode(1024, 768, 32), "Box2D - SFML Debug Draw Test");
window.setFramerateLimit(60);
b2World world(b2Vec2(0.f, 10.f));
world.SetAllowSleeping(true);
/* Initialize SFML Debug Draw */
SFMLDebugDraw debugDraw(window);
world.SetDebugDraw(&debugDraw);
/* Set initial flags for what to draw */
debugDraw.SetFlags(b2Draw::e_shapeBit); //Only draw shapes
/* constants for time step and physics accuracy */
const int velocityIterations = 6;
const int positionIterations = 2;
/* Create the bounding box */
b2BodyDef boundingBoxDef;
boundingBoxDef.type = b2_staticBody;
float xPos = (window.getSize().x / 2.f) / sfdd::SCALE;
float yPos = 0.5f;
boundingBoxDef.position.Set(xPos, yPos);
b2Body* boundingBoxBody = world.CreateBody(&boundingBoxDef);
b2PolygonShape boxShape;
boxShape.SetAsBox((window.getSize().x) / sfdd::SCALE, 0.5f, b2Vec2(0.f, 0.f), 0.f);
boundingBoxBody->CreateFixture(&boxShape, 1.0); //Top
yPos = (window.getSize().y) / sfdd::SCALE - 1.f;
boxShape.SetAsBox((window.getSize().x) / sfdd::SCALE, 0.5f, b2Vec2(0.f, yPos), 0.f);
boundingBoxBody->CreateFixture(&boxShape, 1.f); //Bottom
xPos -= 0.5f;
boxShape.SetAsBox(0.5f, (window.getSize().y) / sfdd::SCALE, b2Vec2(-xPos, 0.f), 0.f);
boundingBoxBody->CreateFixture(&boxShape, 1.f);//Left
boxShape.SetAsBox(0.5f, (window.getSize().y) / sfdd::SCALE, b2Vec2(xPos, 0.f), 0.f);
boundingBoxBody->CreateFixture(&boxShape, 1.f);//Right
b2BodyDef bodyDef;
bodyDef.type = b2_dynamicBody;
bodyDef.position.Set(20, 10);
bodyDef.fixedRotation = true;
b2Body* ground = world.CreateBody(&bodyDef); //This is not the body of the bounding box
b2PolygonShape ps;
ps.SetAsBox(5, 5);
ground->CreateFixture(&ps, 1.f);
sf::Clock deltaClock; //Clock used to measure FPS
sf::Time deltaTime;
// This is our little game loop.
while (window.isOpen())
{
// Check if it's time to go
sf::Event event;
while (window.pollEvent(event))
{
float force;
b2Vec2 currentVel = ground->GetLinearVelocity();
if (event.type == sf::Event::Closed)
{
window.close();
}
else if (event.type == sf::Event::KeyPressed)
{
if (event.key.code == sf::Keyboard::Left)
{
if (currentVel.x > -8.0) {
force = -4.f * deltaTime.asSeconds(); // incremental acceleration to maximum speed
std::cout << currentVel.x << ", " << force << ", " << deltaTime.asSeconds() << std::endl;
ground->ApplyLinearImpulse(b2Vec2(force, 0.f), ground->GetLocalCenter(), true);
}
}
}
}
window.clear();
world.Step(deltaTime.asSeconds(), velocityIterations, positionIterations);
world.DebugDraw();
window.display();
deltaTime = deltaClock.restart();
}
return 0;
}
