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editor.js
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editor.js
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var keyMapping;
function keyCodeToString(keyCode) {
if (isAlphaNum(keyCode)) {
return String.fromCharCode(keyCode).toLowerCase();
}
if (keyMapping)
return keyMapping[keyCode];
// Format: 'readable name' : (keycode | [mac keycode, windows keycode])
var mapping = {
';' : 59,
'=' : [61, 107],
',' : 188,
'.' : 190,
'/' : 191,
'`' : 192,
'[' : 219,
'\\' : [220, 222],
']' : 221,
'\'' : [222, 192],
'backspace' : 8,
'tab' : 9,
'return' : 13,
'enter' : 14,
'pageup' : 33,
'pagedown' : 34,
'end' : 35,
'home' : 36,
'left' : 37,
'right' : 39,
'up' : 38,
'down' : 40,
'insert' : 45,
'delete' : 46,
'space' : 32,
'escape' : 27,
'f1' : 112,
'f2' : 113,
'f3' : 114,
'f4' : 115,
'f5' : 116,
'f6' : 117,
'f7' : 118,
'f8' : 119,
'f9' : 120,
'f10' : 121,
'f11' : 122,
'f12' : 123,
'-' : 109,
'shift' : 16
};
keyMapping = {};
for (var prop in mapping) {
//XXX we currently default to mac keycodes when given a choice
var val = typeof mapping[prop] == "Array" ? mapping[prop][0] : mapping[prop];
keyMapping[val] = prop;
}
return keyMapping[keyCode];
}
function isNum(c) {
return (c >= '0'.charCodeAt(0) && c <= '9'.charCodeAt(0));
}
function isAlpha(c) {
return (c >= 'A'.charCodeAt(0) && c <= 'Z'.charCodeAt(0));
}
function isAlphaNum(c) {
return isAlpha(c) || isNum(c);
}
function EditorInput() {
this.numChannels = 8;
this.numPatterns = 1;
this.numColumns = 5;
this.channel = 0;
this.column = 0;
this.row = 0;
this.pattern = 0;
this.position = 0;
this.selRowStart = 0;
this.selRowEnd = 0;
this.selColStart = 0;
this.selChannelStart = 0;
this.selColEnd = 0;
this.selChannelEnd = 0;
this.inSelection = false;
}
EditorInput.prototype = {
adjustColumn: function(mod) {
this.column += mod;
if (this.column == this.numColumns) {
if (this.adjustChannel(1)) {
this.column = 0;
} else {
this.column--;
}
} else if (this.column == -1) {
if (this.adjustChannel(-1)) {
this.column = this.numColumns - 1;
} else {
this.column++;
}
}
this.updateUI();
},
adjustRow: function(mod, stayWithinPattern) {
this.row += mod;
if (this.row == 64) {
if (!stayWithinPattern && this.adjustPattern(1)) {
this.row = 0;
} else {
this.row--;
}
} else if (this.row == -1) {
if (!stayWithinPattern && this.adjustPattern(-1)) {
this.row = 63;
} else {
this.row++;
}
}
this.updateUI();
},
adjustChannel: function(mod) {
this.channel += mod;
if (this.channel == -1) {
this.channel++;
return false;
} else if (this.channel == this.numChannels) {
this.channel--;
return false;
}
return true;
},
adjustPattern: function(mod) {
this.position += mod;
if (this.position == this.mod.positionCount) {
this.position--;
return false;
} else if (this.position == -1) {
this.position++;
return false;
}
this.pattern = this.mod.positions[this.position];
if (this.position < this.positionOffset)
this.positionOffset--;
else if (this.position == this.positionOffset + this.displayedPositions)
this.positionOffset++;
this.generateStaticEditorUI();
this.generateEditorUI();
this.updateUI();
return true;
},
adjustSample: function(mod) {
var instr = document.getElementById('instrument');
var sample = instr.selectedIndex + mod;
if (sample == -1) {
sample++;
} else if (sample == instr.getElementsByTagName('option').length) {
sample--;
}
instr.selectedIndex = sample;
},
overwriteValue: function(keyCode) {
var row = this.mod.patterns[this.pattern][this.row][this.channel];
switch (this.column) {
case 0:
if (isNum(keyCode))
break;
row.period = periodFromKey(keyCodeToString(keyCode));
row.sample = parseInt(document.getElementById('instrument').selectedIndex + 1);
this.adjustRow(parseInt(document.getElementById('notegap').value));
modPlayer.prepareChannel(modPlayer.channels[this.channel],
{'period': row.period, 'sample': row.sample});
playerEngine.playing = PLAYING_SAMPLE;
break;
case 1:
return;
case 2:
if (!isNum(keyCode))
return;
break;
case 3:
if (!isNum(keyCode) && (keyCode < 'A'.charCodeAt(0) || keyCode > 'F'.charCodeAt(0)))
return;
row.effect = parseInt(String.fromCharCode(keyCode), 16);
break;
case 4:
if (!isNum(keyCode) && (keyCode < 'A'.charCodeAt(0) || keyCode > 'F'.charCodeAt(0)))
return;
row.effectParameter = parseInt(padNumber(row.effectParameter, 16).substr(1) +
parseInt(String.fromCharCode(keyCode), 16), 16);
break;
}
this.generateEditorUI();
this.updateUI();
},
handleKeypress: function(ev) {
if (ev.altKey || ev.target != document.body)
return;
var keyCode = ev.keyCode || ev.which;
var key = keyCodeToString(keyCode);
//console.log(key);
if (!ev.metaKey && (isAlphaNum(keyCode) ||
['[', ']', ';', '\'', ',', '.', '/', '\\'].indexOf(key) != -1)) {
this.overwriteValue(keyCode);
ev.preventDefault();
return;
}
switch (key) {
case 'left':
if (ev.metaKey) {
this.adjustPattern(-1);
} else {
this.adjustColumn(-1);
}
this.updateSelection(ev);
this.updateUI();
break;
case 'right':
if (ev.metaKey) {
this.adjustPattern(1);
} else {
this.adjustColumn(1);
}
this.updateSelection(ev);
this.updateUI();
break;
case 'up':
if (ev.metaKey) {
this.adjustSample(-1);
} else {
this.adjustRow(-1);
}
this.updateSelection(ev);
this.updateUI();
break;
case 'down':
if (ev.metaKey) {
this.adjustSample(1);
} else {
this.adjustRow(1);
}
this.updateSelection(ev);
this.updateUI();
break;
case 'home':
if (this.column == 0)
this.row = 0;
this.column = 0;
this.channel = 0;
this.updateSelection(ev);
this.updateUI();
break;
case 'end':
if (this.column == this.numColumns - 1 && this.channel == this.numChannels - 1)
this.row = 63;
this.column = this.numColumns - 1;
this.channel = this.numChannels - 1;
this.updateSelection(ev);
this.updateUI();
break;
case 'shift':
this.updateSelection(ev, true);
break;
case 'backspace':
for (var i = this.row; i < 63; i++) {
this.mod.patterns[this.pattern][i][this.channel] = this.mod.patterns[this.pattern][i + 1][this.channel];
}
this.mod.patterns[this.pattern][63][this.channel] =
{'period': 0, 'sample': 0, 'effect': 0, 'effectParameter': 0};
this.generateEditorUI();
this.updateUI();
break;
case 'delete':
var startCol, endCol, startChannel, endChannel, startRow, endRow;
if (this.inSelection) {
startCol = this.selColStart;
endCol = this.selColEnd;
startChannel = this.selChannelStart;
endChannel = this.selChannelEnd;
startRow = this.selRowStart;
endRow = this.selRowEnd;
} else {
startCol = this.column;
endCol = this.column;
startChannel = this.channel;
endChannel = this.channel;
startRow = this.row;
endRow = this.row;
}
for (var j = startRow; j <= endRow; j++) {
for (var k = startChannel; k <= endChannel; k++) {
var start = k == startChannel ? startCol : 0;
var end = k == endChannel ? endCol : this.numColumns - 1;
for (var i = start; i <= end; i++) {
var cols = [];
switch (i) {
case 0: cols.push("period"); break;
case 1: cols.push("sample"); break;
case 2: cols.push("volume"); break;
case 3: cols.push("effect"); /* fallthrough */
case 4: cols.push("effectParameter"); break;
}
for (var l = 0; l < cols.length; l++)
this.mod.patterns[this.pattern][j][k][cols[l]] = 0;
}
}
}
this.generateEditorUI();
this.updateUI();
break;
case 'f5':
stop();
var row = this.row;
modPlayer.loadPosition(this.position);
modPlayer.loadRow(row);
play();
break;
case 'f6':
playFromStart();
break;
case 'f7':
stop();
modPlayer.loadPosition(this.position);
playerEngine.playing = PLAYING_PATTERN;
this.playingPosition = this.position;
break;
case 'f8':
stop();
break;
case 'return':
if (!ev.ctrlKey)
return;
//stop();
var row = this.row;
if (modPlayer.currentPosition != this.position)
modPlayer.loadPosition(this.position);
modPlayer.loadRow(row);
playerEngine.playing = PLAYING_ROW;
this.playingRow = row;
break;
case 'e':
if (!ev.metaKey)
return;
openSampleEditor(document.getElementById('instrument').selectedIndex);
break;
case 'o':
if (!ev.metaKey)
return;
openLoadDialog('Open module', loadModule);
break;
case 's':
if (!ev.metaKey)
return;
if (editor.mod.id === undefined) {
openSaveDialog();
} else {
fileStore.get(editor.mod.id, function(data) {
fileStore.put(data.name, editor.mod.serialize(),
function(id) { editor.mod.id = id; },
editor.mod.id);
});
}
break;
default:
return;
}
ev.preventDefault();
},
updateSelection: function(ev, force) {
if (!ev.shiftKey && !force) {
this.inSelection = false;
return;
}
if (!this.inSelection) {
this.inSelection = true;
this.selRowStart = this.selRowEnd = this.row;
this.selColStart = this.selColEnd = this.column;
this.selChannelStart = this.selChannelEnd = this.channel;
} else {
var key = keyCodeToString(ev.which);
var vertChange = key == 'up' ? -1 : key == 'down' ? 1 : 0;
var horizChange = key == 'left' ? -1 : key == 'right' ? 1 : 0;
if (horizChange == -1) {
if (this.channel < this.selChannelStart) {
this.selChannelStart = this.channel;
this.selColStart = this.column;
} else if (this.channel == this.selChannelStart) {
if (this.column < this.selColStart) {
this.selColStart = this.column;
} else if (this.column >= this.selColStart) {
this.selColEnd = this.column;
this.selChannelEnd = this.channel;
}
} else {
this.selChannelEnd = this.channel;
this.selColEnd = this.column;
}
} else if (horizChange == 1) {
if (this.channel < this.selChannelEnd) {
this.selChannelStart = this.channel;
this.selColStart = this.column;
} else if (this.channel == this.selChannelStart) {
if (this.column < this.selColEnd) {
this.selColStart = this.column;
this.selChannelStart = this.channel;
} else if (this.column >= this.selColEnd) {
this.selColEnd = this.column;
}
} else {
if (this.channel == this.selChannelEnd) {
if (this.column < this.selColEnd) {
this.selChannelStart = this.channel;
this.selColStart = this.column;
}
}
if (this.column >= this.selColEnd || this.channel >= this.selChannelEnd)
this.selColEnd = this.column;
this.selChannelEnd = this.channel;
}
}
if (vertChange == -1) {
if (this.row < this.selRowStart)
this.selRowStart = this.row;
else
this.selRowEnd = this.row;
} else if (vertChange == 1) {
if (this.row < this.selRowEnd)
this.selRowStart = this.row;
else
this.selRowEnd = this.row;
}
}
},
positionOffset: 0,
displayedPositions: 20,
generateStaticEditorUI: function() {
var instr = document.getElementById('instrument');
while (instr.childNodes.length > 0) {
instr.removeChild(instr.firstChild);
}
for (var i = 0; i < this.mod.samples.length; i++) {
var elem = document.createElement('option');
elem.textContent = (i + 1) + ". " + this.mod.samples[i].name;
instr.appendChild(elem);
}
var self = this;
var patterns = document.getElementById('pattern-list');
while (patterns.childNodes.length > 0) {
patterns.removeChild(patterns.firstChild);
}
var elem = document.createElement('div');
elem.textContent = "<";
elem.setAttribute('class', 'position-button');
$(elem).mousedown(function(ev) {
if (self.positionOffset == 0)
return;
self.positionOffset--;
self.generateStaticEditorUI();
});
patterns.appendChild(elem);
for (var i = 0; i < this.displayedPositions; i++) {
elem = document.createElement('div');
if (this.positionOffset + i < this.mod.positionCount) {
elem.textContent = this.mod.positions[this.positionOffset + i];
$(elem).mousedown((function(val) {
return function(ev) {
self.position = self.positionOffset + val;
self.pattern = self.mod.positions[self.position];
self.generateStaticEditorUI();
self.generateEditorUI();
self.updateUI();
};})(i));
} else {
elem.textContent = "-";
}
if (this.position == this.positionOffset + i)
elem.setAttribute('class', 'pattern-selected');
patterns.appendChild(elem);
}
elem = document.createElement('div');
elem.textContent = ">";
elem.setAttribute('class', 'position-button');
$(elem).mousedown(function(ev) {
if (self.positionOffset + self.displayedPositions == self.mod.positionCount)
return;
self.positionOffset++;
self.generateStaticEditorUI();
});
patterns.appendChild(elem);
},
generateEditorUI: function() {
if (!this.mod)
return;
var channels = $('.channel');
channels.each(function() { this.parentNode.removeChild(this); });
var pattern = this.mod.patterns[this.pattern];
for (var i = 0; i < this.numChannels; i++) {
var channel = document.createElement('span');
$(channel).addClass('channel');
document.getElementById('channels').appendChild(channel);
var header = document.createElement('div');
$(header).addClass('header');
if (modPlayer.channels[i].muted)
$(header).addClass('muted');
header.textContent = "Channel " + (i + 1);
(function(val) {$(header).mousedown(function(ev) {
modPlayer.channels[val].muted ^= 1;
if (modPlayer.channels[val].muted)
$(this).addClass('muted');
else
$(this).removeClass('muted');
});})(i);
channel.appendChild(header);
for (var j = 0; j < 64; j++) {
var row = pattern[j][i];
var rowElem = document.createElement('div');
$(rowElem).addClass('row');
var elem = document.createElement('span');
var hasContent = !!row.period;
$(elem).addClass(hasContent ? 'note' : 'blank');
elem.textContent = hasContent ? periodToDisplay(row.period) : '...';
rowElem.appendChild(elem);
elem = document.createElement('span');
hasContent = !!row.sample;
$(elem).addClass(hasContent ? 'instrument' : 'blank');
elem.textContent = hasContent ? padNumber(row.sample, 10) : '..';
rowElem.appendChild(elem);
elem = document.createElement('span');
hasContent = false;
$(elem).addClass(hasContent ? 'volume' : 'blank');
elem.textContent = '..';
rowElem.appendChild(elem);
elem = document.createElement('span');
$(elem).addClass(effectToClass(row.effect, row.effectParameter));
elem.textContent = !!row.effect || !!row.effectParameter ?
row.effect.toString(16).toUpperCase() : '.';
rowElem.appendChild(elem);
elem = document.createElement('span');
$(elem).addClass(effectToClass(row.effect, row.effectParameter));
elem.textContent = !!row.effect || !!row.effectParameter ?
padNumber(row.effectParameter, 16) : '..';
rowElem.appendChild(elem);
channel.appendChild(rowElem);
}
}
},
updateUI: function() {
$('.row-highlight').removeClass('row-highlight');
$('.highlight').removeClass('highlight');
$('.selected').removeClass('selected');
var channels = $('.channel');
var idx = 0;
var self = this;
var highlightedCol;
$(channels).each(function() {
var row = $($(this).find('.row')[self.row]);
row.addClass('row-highlight');
if (idx == self.channel) {
highlightedCol = row.find('span')[self.column];
$(highlightedCol).addClass('highlight');
}
if (self.inSelection && idx >= self.selChannelStart &&
idx <= self.selChannelEnd) {
for (var k = self.selRowStart; k <= self.selRowEnd; k++) {
var aRow = $($(this).find('.row')[k]);
var start = self.selChannelStart == idx ? self.selColStart : 0;
var end = self.selChannelEnd == idx ? self.selColEnd : self.numColumns;
for (var j = start; j <= end; j++) {
$(aRow.find('span')[j]).addClass('selected');
}
}
}
idx++;
});
if (highlightedCol) {
$('html,body').animate({scrollTop: $(highlightedCol).offset().top - window.innerHeight/2}, 0);
}
},
loadMOD: function(mod) {
this.mod = mod;
this.numPatterns = mod.patternCount;
this.numChannels = mod.channelCount;
this.position = 0;
this.pattern = mod.positions[this.position];
this.generateStaticEditorUI();
this.generateEditorUI();
this.updateUI();
},
// Used to disable any delayed UI updates that might occur
// and overwrite an immediate UI update that has taken place
inhibitFurtherUpdates: function() {
if (this.pendingUpdates > 0)
this.inhibitUpdates = true;
},
pendingUpdates: 0,
inhibitUpdates: false,
triggerUpdate: function(currentPlayer) {
// We can ignore updates when we're previewing sample sounds
if (!this.mod || playerEngine.playing == PLAYING_SAMPLE)
return;
// Since the actual UI updates can be delayed to sync with the sound buffer,
// we need to perform the actual logical checks here if we plan to update
// the player at all.
// If we run off the end of a pattern when in single-pattern repeat mode, reset to
// the repeating pattern.
if (playerEngine.playing == PLAYING_PATTERN && this.playingPosition != currentPlayer.currentPosition)
currentPlayer.loadPosition(this.playingPosition);
this.playingPosition = currentPlayer.currentPosition;
if (this.inhibitUpdates)
return;
var self = this;
var player = {
currentPosition: currentPlayer.currentPosition,
currentRow: currentPlayer.currentRow
};
this.pendingUpdates++;
setTimeout(function() {
self.pendingUpdates--;
var inhibited = self.inhibitUpdates;
if (!self.pendingUpdates) {
self.inhibitUpdates = false;
}
if (inhibited)
return;
var lastPosition = self.position;
self.position = player.currentPosition;
if (lastPosition != self.position)
self.generateStaticEditorUI(); //XXX won't keep current scrolled in view
var oldPattern = self.pattern;
self.pattern = self.mod.positions[self.position];
self.row = player.currentRow;
if (oldPattern != self.pattern)
self.generateEditorUI();
self.updateUI();
}, audioSyncDelay);
},
mod: null
};
function validNote(period) {
var noteNum = ModPeriodToNoteNumber[period];
return noteNum >= 1 && noteNum <= 120;
}
function periodFromKey(key) {
var baseOctave = 2;
var idx = ["q", "w", "e", "r", "t", "y", "u", "i", "o", "p", "[", "]",
"a", "s", "d", "f", "g", "h", "j", "k", "l", ";", "'", "\\",
"z", "x", "c", "v", "b", "n", "m", ",", ".", "/", "", ""].indexOf(key);
return ModPeriodTable[0][idx % 12 + (baseOctave + Math.floor(idx / 12)) * 12];
}
function periodToDisplay(period) {
var noteNum = ModPeriodToNoteNumber[period];
var name = ["C-", "C#", "D-", "D#", "E-", "F-", "F#", "G-", "G#", "A-", "A#", "B-"][(noteNum) % 12];
return name + (Math.floor(noteNum / 12) + 2);
}
function effectToClass(fx, parameter) {
switch (fx) {
case 0x00:
return 'blank'; //arpeggio!!!
case 0x01:
return 'portamentoup';
case 0x02:
return 'portamentodown';
case 0x03:
return 'portamento';
case 0x04:
return 'vibrato';
case 0x05:
return 'potamento-volslide';
case 0x06:
return 'vibrato-volslide';
case 0x07:
return 'tremolo';
case 0x08:
return 'panning';
case 0x09:
return 'offset';
case 0x0a:
return 'volumeslide';
case 0x0b:
return 'positionjump';
case 0x0c:
return 'setvolume';
case 0x0d:
return 'patternbreak';
case 0x0e:
switch ((parameter & 0xF0) >> 4) {
case 0x00:
return 'setfilter';
case 0x01:
return 'fineslideup';
case 0x02:
return 'fineslidedown';
case 0x03:
return 'setglissando';
case 0x04:
return 'setvibrato';
case 0x05:
return 'setfinetune';
case 0x06:
return 'looppattern';
case 0x07:
return 'settremolo';
case 0x08:
return 'blank';
case 0x09:
return 'retrigger';
case 0x0a:
return 'finevolumeslideup';
case 0x0b:
return 'finevolumeslidedown';
case 0x0c:
return 'cutsample';
case 0x0d:
return 'delaysample';
case 0x0e:
return 'delaypattern';
case 0x0f:
return 'invertloop';
}
case 0x0f:
return 'setspeed';
default:
return 'blank';
}
}
function padNumber(num, base) {
return (num < base ? "0" : "") + num.toString(base).toUpperCase();
}
function SampleEditor() {
}
SampleEditor.prototype = {
handleKeypress: function(ev) {
if (ev.altKey || ev.ctrlKey || ev.metaKey || ev.target != document.body)
return;
var keyCode = ev.keyCode || ev.which;
var key = keyCodeToString(keyCode);
//console.log(keyCode);
if (!ev.metaKey && (isAlphaNum(keyCode) ||
['[', ']', ';', '\'', ',', '.', '/', '\\'].indexOf(key) != -1)) {
this.previewSample(keyCode);
ev.preventDefault();
return;
}
switch (key) {
case 'escape':
this.stopPreview();
closeSampleEditor();
break;
case 'f8':
this.stopPreview();
break;
case 'pagedown':
if (this.currentInstrument == editor.mod.sampleCount - 1)
break;
this.currentInstrument++;
this.drawWaveform(document.getElementById('sample-display'));
document.getElementById('instrument').selectedIndex = this.currentInstrument;
break;
case 'pageup':
if (this.currentInstrument == 0)
break;
this.currentInstrument--;
this.drawWaveform(document.getElementById('sample-display'));
document.getElementById('instrument').selectedIndex = this.currentInstrument;
break;
case 'delete':
if (this.selStart == this.selEnd)
break;
var canvas = document.getElementById('sample-display');
var sample = [];
for (var i = 0; i < editor.mod.sampleData[this.currentInstrument].length; i++)
sample.push(editor.mod.sampleData[this.currentInstrument][i]);
var startIndex = Math.floor(this.selStart * sample.length / canvas.width);
var endIndex = Math.floor(this.selEnd * sample.length / canvas.width);
sample.splice(Math.min(startIndex, endIndex), Math.abs(endIndex - startIndex));
editor.mod.sampleData[this.currentInstrument] = new Uint8Array(sample.length, "uint8");
for (var i = 0; i < sample.length; i++)
editor.mod.sampleData[this.currentInstrument][i] = sample[i];
editor.mod.samples[this.currentInstrument].length = sample.length;
this.selStart = this.selEnd = 0;
this.drawWaveform(canvas);
break;
default:
return;
}
ev.preventDefault();
},
selStart: 0,
selEnd: 0,
selecting: false,
handleMouseDown: function(ev) {
if (ev.button != 0)
return;
this.selecting = true;
this.selStart = this.selEnd = ev.clientX - ev.target.parentNode.offsetLeft;
this.drawWaveform(ev.target);
ev.preventDefault();
},
handleMouseMove: function(ev) {
if (!this.selecting)
return;
this.selEnd = ev.clientX - ev.target.parentNode.offsetLeft;
this.drawWaveform(ev.target);
ev.preventDefault();
},
handleMouseUp: function(ev) {
if (ev.button != 0)
return;
this.selecting = false;
this.selEnd = ev.clientX - ev.target.parentNode.offsetLeft;
if (this.selEnd < this.selStart) {
var tmp = this.selEnd;
this.selEnd = this.selStart;
this.selStart = tmp;
}
this.drawWaveform(ev.target);
ev.preventDefault();
},
handleDoubleClick: function(ev) {
if (ev.button != 0)
return;
this.selStart = 0;
this.selEnd = ev.target.width;
this.drawWaveform(ev.target);
ev.preventDefault();
},
stopPreview: function() {
if (this.fakeChannel)
this.fakeChannel.playing = false;
playerEngine.playing = STOPPED;
},
previewSample: function(keyCode) {
this.fakeChannel = modPlayer.createChannel();
var note = {
period: periodFromKey(keyCodeToString(keyCode)),
sample: this.currentInstrument + 1
};
if (this.selEnd - this.selStart) {
var canvas = document.getElementById('sample-display');
var sample = editor.mod.samples[this.currentInstrument];
note.offset = Math.floor(this.selStart * sample.length / canvas.width);
note.length = Math.floor(this.selEnd * sample.length / canvas.width) - note.offset;
}
modPlayer.prepareChannel(this.fakeChannel, note);
playerEngine.playing = PLAYING_PREVIEW;
this.lastPlayPosition = 0;
var self = this;
var callback = function(timestamp) {
if (self.fakeChannel.samplePosition != self.lastPlayPosition) {
var samplePosition = self.fakeChannel.samplePosition;
if ('offset' in self.fakeChannel.sample)
samplePosition += self.fakeChannel.sample.offset;
var playing = self.fakeChannel.playing;
setTimeout(function() {
self.drawWaveform(document.getElementById('sample-display'), playing, samplePosition);
}, audioSyncDelay);
this.lastPlayPosition = samplePosition;
}
if (self.fakeChannel.playing)
requestAnimationFrame(callback);
};
requestAnimationFrame(callback);
},
getPreviewSource: function() {
return this.fakeChannel;
},
drawWaveform: function(canvas, playing, samplePosition) {
var sample = editor.mod.sampleData[this.currentInstrument];
var yOffset = Math.floor(canvas.height / 2);
var lasty = -(sample[0] - 128);
var length = sample.length;
function sampleData(index) {
return ((sample[index] + 128) & 0xFF) - 128;
}
function scaledXpos(x) {
return x * length / canvas.width;
}
var context = canvas.getContext("2d");
context.fillStyle = "#000000";
context.fillRect(0, 0, canvas.width, canvas.height);
context.fillStyle = "#FFFFFF";
context.fillRect(this.selStart, 0, this.selEnd - this.selStart, canvas.height);
context.beginPath();
context.strokeStyle = "#FF0000";
for (var x = 0; x < canvas.width; x++) {
var findex = scaledXpos(x);
var index = Math.floor(findex);
var index2 = index + 1;
if (index2 >= sample.length)
index2 = sample.length - 1;
var t = findex - index;