1 /* 2 * Copyright (C) 2015 Nicolas Bonnefon and other contributors 3 * 4 * This file is part of glogg. 5 * 6 * glogg is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * 11 * glogg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with glogg. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "viewtools.h" 21 22 #include "log.h" 23 24 /* ElasticHook */ 25 26 void ElasticHook::move( int value ) 27 { 28 static constexpr int MAX_POSITION = 2000; 29 30 if ( timer_id_ == 0 ) 31 timer_id_ = startTimer( TIMER_PERIOD_MS ); 32 33 int resistance = 0; 34 if ( !held_ && ( position_ * value > 0 ) ) // value and resistance have the same sign 35 resistance = position_ / 10; 36 37 position_ = std::min( position_ + ( value - resistance ), MAX_POSITION ); 38 39 if ( !held_ && ( std::chrono::duration_cast<std::chrono::milliseconds> 40 ( std::chrono::steady_clock::now() - last_update_ ).count() > TIMER_PERIOD_MS ) ) 41 decreasePosition(); 42 43 if ( ( ! hooked_ ) && position_ >= hook_threshold_ ) { 44 position_ -= hook_threshold_; 45 hooked_ = true; 46 emit hooked( true ); 47 } 48 else if ( hooked_ && position_ <= - hook_threshold_ ) { 49 position_ += hook_threshold_; 50 hooked_ = false; 51 emit hooked( false ); 52 } 53 54 if ( position_ < 0 && !isHooked() ) 55 position_ = 0; 56 57 last_update_ = std::chrono::steady_clock::now(); 58 59 LOG( logDEBUG ) << "ElasticHook::move: new value " << position_; 60 61 emit lengthChanged(); 62 } 63 64 void ElasticHook::timerEvent( QTimerEvent* event ) 65 { 66 if ( !held_ && ( std::chrono::duration_cast<std::chrono::milliseconds> 67 ( std::chrono::steady_clock::now() - last_update_ ).count() > TIMER_PERIOD_MS ) ) { 68 decreasePosition(); 69 last_update_ = std::chrono::steady_clock::now(); 70 } 71 } 72 73 void ElasticHook::decreasePosition() 74 { 75 static constexpr int PROP_RATIO = 10; 76 77 // position_ -= DECREASE_RATE + ( ( position_/SQUARE_RATIO ) * ( position_/SQUARE_RATIO ) ); 78 if ( std::abs( position_ ) < DECREASE_RATE ) { 79 position_ = 0; 80 killTimer( timer_id_ ); 81 timer_id_ = 0; 82 } 83 else if ( position_ > 0 ) 84 position_ -= DECREASE_RATE + ( position_/PROP_RATIO ); 85 else if ( position_ < 0 ) 86 position_ += DECREASE_RATE - ( position_/PROP_RATIO ); 87 88 LOG( logDEBUG ) << "ElasticHook::timerEvent: new value " << position_; 89 90 emit lengthChanged(); 91 } 92