Method addGear

samples/FallingGears/src/SceneController.cpp:217–255

}

void SceneController::addGear( const vec2 &pos )
{
	float wallDeadZoneWidth = mParams.mWallInset + mParams.mWallWidth / 2;
	if( pos.x < wallDeadZoneWidth || pos.x > ( app::getWindowWidth() - wallDeadZoneWidth ) )
	   return;

	vec2 posScaled = pointsToMeters( pos );

	auto imageTex = getRandomGearTex();
	const float radius = mParams.mGearScale * imageTex->getWidth() / 2.0f;

	b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;
	bodyDef.allowSleep = false;
	bodyDef.position.Set( posScaled.x, posScaled.y );

	const float velMax = 5;
	bodyDef.linearVelocity = b2Vec2( randFloat( -velMax, velMax ), randFloat( -velMax, 0 ) );

	b2CircleShape shape;
	shape.m_radius = pointsToMeters( radius );

	b2FixtureDef fixtureDef;
	fixtureDef.shape = &shape;
	fixtureDef.density = 1.0f;
	fixtureDef.friction = 1.0f;
	fixtureDef.restitution = 0.4f;

	mGears.push_back( make_shared<Gear>( mAudio ) );
	auto &gear = mGears.back();
	gear->mTag = string( "gear" );
	gear->mIdentifier = mGearIdentifierTab++;
	gear->mImageTex = imageTex;
	gear->mRadius = radius;

	gear->mBody = box2d::makeBodyShared( mWorld.get(), bodyDef );
	gear->mBody->CreateFixture( &fixtureDef );
	gear->mBody->SetUserData( gear.get() );
}

ci::gl::TextureRef SceneController::getRandomGearTex() const
{