�PNG  IHDR��;���IDATx��ܻn�0���K�� �)(�pA��� ���7�LeG{�� �§㻢|��ذaÆ 6lذaÆ 6lذaÆ 6lom��$^�y���ذag�5bÆ 6lذaÆ 6lذa{���� 6lذaÆ �`����}H�Fkm�,�m����Ӫ���ô�ô!� �x�|'ܢ˟;�E:���9�&ᶒ�}�{�v]�n&�6� �h��_��t�ڠ͵-ҫ���Z;��Z$�.�P���k�ž)�!��o���>}l�eQfJ�T��u і���چ��\��X=8��Rن4`Vw�l�>����n�G�^��i�s��"ms�$�u��i��?w�bs[m�6�K4���O���.�4��%����/����b�C%��t ��M�ז� �-l�G6�mrz2���s�%�9��s@���-�k�9�=���)������k�B5����\��+͂�Zsٲ ��Rn��~G���R���C����� �wIcI��n7jJ���hۛNCS|���j0��8y�iHKֶۛ�k�Ɉ+;Sz������L/��F�*\��Ԕ�#"5��m�2��[S��������=�g��n�a�P�e�ғ�L�� lذaÆ 6l�^k��̱aÆ 6lذaÆ 6lذa;���� �_��ذaÆ 6lذaÆ 6lذaÆ ���R���IEND�B` /** * violin.js * http://www.codrops.com * * Licensed under the MIT license. * http://www.opensource.org/licenses/mit-license.php * * Copyright 2016, Codrops * http://www.codrops.com */ ;(function(window) { /** * Violin obj. For this demo the Violin will only play natural notes from C2 to C5. */ function Violin(el) { this.el = el; this.midiCode = 40; // Some random notes to choose from depending on the mouse position (x-axis). this.notes = [15,17,19,20,22,24,26,27,29,31,32,34,36,38,39,41,43,44,46,48,50,51]; this.notesTotal = this.notes.length; this._initEvents(); } Violin.prototype._initEvents = function() { var self = this, isMobile = mobilecheck(), evs = { down: isMobile ? 'touchstart' : 'mousedown', up: isMobile ? 'touchend' : 'mouseup', move: isMobile ? 'touchmove' : 'mousemove' }; this.mousedownFn = function(ev) { self.mdown = true; var note = self._getNote(ev); self._play(note, 'on'); }; this.el.addEventListener(evs.down, this.mousedownFn); this.mouseupFn = function(ev) { if( !self.mdown ) { return false; } self.mdown = false; var note = self._getNote(ev); self._play(note, 'off'); }; this.el.addEventListener(evs.up, this.mouseupFn); this.mousemoveFn = function(ev) { if( !self.mdown ) { return false; } requestAnimationFrame(function() { var note = self._getNote(ev); if( note != self.currentNote ) { self._play(self.currentNote, 'off', 0); self._play(note, 'on'); } }); }; this.el.addEventListener(evs.move, this.mousemoveFn); if( !isMobile ) { this.mouseleaveFn = function(ev) { if( self.mdown ) { self.mdown = false; self._play(self.currentNote, 'off', 0); } }; this.el.addEventListener('mouseleave', this.mouseleaveFn); } }; Violin.prototype._getNote = function(ev) { // Mouse position relative to the document. var mousepos = getMousePos(ev), elWidth = this.el.offsetWidth, // Document scrolls. docScrolls = {left : document.body.scrollLeft + document.documentElement.scrollLeft, top : document.body.scrollTop + document.documentElement.scrollTop}, bounds = this.el.getBoundingClientRect(), // Mouse position relative to the main element (this.DOM.el). relmousepos = { x : mousepos.x - bounds.left - docScrolls.left, y : mousepos.y - bounds.top - docScrolls.top }, note = this.notes[Math.floor((this.notesTotal-1)/elWidth*relmousepos.x)]; return note; }; Violin.prototype._play = function(note, status, offDelay) { var channel = 0, note = parseInt(note) + 21, delay = 0, velocity = 127; // how hard the note hits MIDI.programChange(0, this.midiCode); if( status === 'on' ) { this.currentNote = note - 21; MIDI.noteOn(channel, note, velocity, delay); } else { var self = this; offDelay = offDelay || .1; MIDI.noteOff(channel, note, offDelay); } }; window.Violin = Violin; })(window);