void Warp::mouseDown( cinder::app::MouseEvent &event )
{
if( !sIsEditMode ) return;
if( mSelected >= mPoints.size() ) return;
// calculate offset by converting control point from normalized to standard screen space
ivec2 p = ( getControlPoint( mSelected ) * mWindowSize );
mOffset = event.getPos() - p;
event.setHandled( true );
}
void Warp::mouseDrag( cinder::app::MouseEvent &event )
{
if( !sIsEditMode ) return;
if( mSelected >= mPoints.size() ) return;
vec2 m( event.getPos() );
vec2 p( m.x - mOffset.x, m.y - mOffset.y );
// set control point in normalized screen space
setControlPoint( mSelected, p / mWindowSize );
mIsDirty = true;
event.setHandled( true );
}