// Maps Leap vector to the screen in pixels Vec2f GestureApp::warpVector( const Vec3f& v ) { Vec3f result = Vec3f::zero(); if ( mLeap ) { const ScreenMap& screens = mLeap->getScreens(); if ( !screens.empty() ) { const Screen& screen = screens.begin()->second; result = screen.project( v, true ); } } result *= Vec3f( getWindowSize(), 0.0f ); result.y = (float)getWindowHeight() - result.y; return result.xy(); }
void ChargesApp::update() { mFps = getAverageFps(); // Update device if ( mLeap && mLeap->isConnected() ) { mLeap->update(); } vector< int32_t > currentFingersIds; for ( const std::pair< int32_t, LeapSdk::Hand > hand : mHands ) { const LeapSdk::FingerMap &fingers = hand.second.getFingers(); for ( const auto &fkv : fingers ) { int32_t id = fkv.first; const LeapSdk::Finger &finger = fkv.second; currentFingersIds.push_back( id ); // new finger? if ( mActiveFingers.find( id ) == mActiveFingers.end() ) { mActiveFingers[ id ] = mTimestamp; mEffectCharge.addCursor( id, 0.f, 0.f, 1.f ); // init with (0, 0), will be updated below } // update finger const LeapSdk::ScreenMap &screens = mLeap->getScreens(); if ( screens.begin() != screens.end() ) { mActiveFingers[ id ] = mTimestamp; const LeapSdk::Screen &screen = screens.begin()->second; Vec3f normPos; screen.intersects( finger, normPos, true, 1.5f ); // normalized screen coordinates with 1.5 clamp ratio Vec2f fingertip = normPos.xy() * Vec2f( mFbo.getSize() ); Vec3f screenPos; screen.intersects( finger, screenPos, false, 1.5f ); // screen coordinates with 1.5 clamp ratio float d = screenPos.distance( finger.getPosition() ); const float dMin = 50.f; const float dMax = 500.f; const float sMin = 1.f; const float sMax = 100.f; d = math< float >::clamp( d, dMin, dMax ); float strength = lmap( d, dMin, dMax, sMax, sMin ); mEffectCharge.updateCursor( id, fingertip.x, fingertip.y, strength ); } } } // erase disappeared fingers int64_t disappearThr = mFingerDisapperanceThreshold * 1000000; for ( auto it = mActiveFingers.begin(); it != mActiveFingers.end(); ) { int32_t id = it->first; if ( find( currentFingersIds.begin(), currentFingersIds.end(), id ) == currentFingersIds.end() ) { // seen earlier than the threshold? if ( mTimestamp - it->second > disappearThr ) { mEffectCharge.removeCursor( id ); it = mActiveFingers.erase( it ); } else { it++; } } else { it++; } } }