void Diamond::updateMotion( double deltaT )
{
age += deltaT;
// extremely realistic physics!
Vect2 position = line->getPosition() + ( velocity * deltaT );
if( position.getx() < SURFACE_MIN_U )
{
// bounce
if( velocity.getx() < 0.0 )
{
velocity.Set( velocity.getx() * -1.0, velocity.gety() );
}
// clamp
position.Set( SURFACE_MIN_U, position.gety() );
}
else if( position.getx() > SURFACE_MAX_U )
{
// bounce
if( velocity.getx() > 0.0 )
{
velocity.Set( velocity.getx() * -1.0, velocity.gety() );
}
// clamp
position.Set( SURFACE_MAX_U, position.gety() );
}
if( position.gety() < SURFACE_MIN_V )
{
// bounce
if( velocity.gety() < 0.0 )
{
velocity.Set( velocity.getx(), velocity.gety() * -1.0 );
}
// clamp
position.Set( position.getx(), SURFACE_MIN_V );
}
else if( position.gety() > SURFACE_MAX_V )
{
// bounce
if( velocity.gety() > 0.0 )
{
velocity.Set( velocity.getx(), velocity.gety() * -1.0 );
}
// clamp
position.Set( position.getx(), SURFACE_MAX_V );
}
line->setPosition( position );
/* float rotation = line->getRotation() + ( rotationalVelocity * deltaT );
// clamp
// prevent near-infinite looping, just in case
if( rotation < -720.0 || rotation > 720.0 )
rotation = 0.0;
while( rotation < 0.0 )
rotation += 360.0;
while( rotation > 360.0 )
rotation -= 360.0;
line->setRotation( rotation );*/
float pulsePercentage = age * pulseRate;
// need to find the decimal part of pulsePercentage
pulsePercentage -= static_cast<int>( pulsePercentage );
// use sine to make pulsePercentage oscillate
// pi*2 = full range of sine
// 0.5 needed because results of sine range from -1 to +1
pulsePercentage = ( sinf( pulsePercentage * M_PI * 2.0f ) + 1.0f ) * 0.5f;
line->setScale(
interpolate( pulseScaleMin, pulseScaleMax, 1.0f - pulsePercentage ),
interpolate( pulseScaleMin, pulseScaleMax, pulsePercentage ) );
}
void Pinwheel::updateMotion( double deltaT )
{
// extremely realistic physics!
Vect2 position = line->getPosition() + ( velocity * deltaT );
if( position.getx() < SURFACE_MIN_U )
{
// bounce
if( velocity.getx() < 0.0 )
{
velocity.Set( velocity.getx() * -1.0, velocity.gety() );
}
// clamp
position.Set( SURFACE_MIN_U, position.gety() );
}
else if( position.getx() > SURFACE_MAX_U )
{
// bounce
if( velocity.getx() > 0.0 )
{
velocity.Set( velocity.getx() * -1.0, velocity.gety() );
}
// clamp
position.Set( SURFACE_MAX_U, position.gety() );
}
if( position.gety() < SURFACE_MIN_V )
{
// bounce
if( velocity.gety() < 0.0 )
{
velocity.Set( velocity.getx(), velocity.gety() * -1.0 );
}
// clamp
position.Set( position.getx(), SURFACE_MIN_V );
}
else if( position.gety() > SURFACE_MAX_V )
{
// bounce
if( velocity.gety() > 0.0 )
{
velocity.Set( velocity.getx(), velocity.gety() * -1.0 );
}
// clamp
position.Set( position.getx(), SURFACE_MAX_V );
}
line->setPosition( position );
float rotation = line->getRotation() + ( rotationalVelocity * deltaT );
// clamp
// prevent near-infinite looping, just in case
if( rotation < -720.0 || rotation > 720.0 )
rotation = 0.0;
while( rotation < 0.0 )
rotation += 360.0;
while( rotation > 360.0 )
rotation -= 360.0;
line->setRotation( rotation );
}