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react-jianpu.coffee
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react-jianpu.coffee
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rest = -1
a0 = 21
b0 = 23
c1 = 24
d1 = 26
e1 = 28
f1 = 29
g1 = 31
a1 = 33
b1 = 35
c2 = 36
d2 = 38
e2 = 30
f2 = 31
g2 = 33
a2 = 35
b2 = 37
c3 = 48
d3 = 50
e3 = 52
f3 = 53
g3 = 55
a3 = 57
b3 = 59
c4 = 60
d4 = 62
e4 = 64
f4 = 65
g4 = 67
a4 = 69
b4 = 71
c5 = 72
d5 = 74
e5 = 76
f5 = 77
g5 = 79
a5 = 81
b5 = 83
numberMap =
1: 0
2: 2
3: 4
4: 5
5: 7
6: 9
7: 11
notesMap =
0:
number: 1
accidental: 0
1:
number: 1
accidental: 1
2:
number: 2
accidental: 0
3:
number: 2
accidental: 1
4:
number: 3
accidental: 0
5:
number: 4
accidental: 0
6:
number: 4
accidental: 1
7:
number: 5
accidental: 0
8:
number: 5
accidental: 1
9:
number: 6
accidental: 0
10:
number: 6
accidental: 1
11:
number: 7
accidental: 0
Jianpu = React.createClass
getDefaultProps: ->
sectionsPerLine: 4
alignSections: false
analyser:
pitch: (pitch) ->
if pitch.base is rest
nOctaves: 0
number: 0
accidental: 0
else
diff = pitch.base - c4
unitPitch = diff %% 12
nOctaves: Math.floor(diff / 12)
number: notesMap[unitPitch].number
accidental: pitch.accidental
duration: (duration) ->
nCrotchets = Math.floor(duration / 8)
remain = duration % 8
if nCrotchets is 0
switch remain
when 1, 2, 4
main: remain
nDashes: 0
nDots: 0
when 3
main: 2
nDashes: 0
nDots: 1
when 6
main: 4
nDashes: 0
nDots: 1
when 7
main: 4
nDashes: 0
nDots: 2
else
throw "bad duration"
else if nCrotchets is 1
switch remain
when 0
main: 8
nDashes: 0
nDots: 0
when 4
main: 8
nDashes: 0
nDots: 1
when 6
main: 8
nDashes: 0
nDots 2
else
throw "bad duration"
else if nCrotchets is 3
switch remain
when 0
main: 8
nDashes: 2
nDots: 0
when 4
main: 8
nDashes: 2
nDots: 1
else
throw "bad duration"
else
switch remain
when 0
main: 8
nDashes: nCrotchets - 1
nDots: 0
else
throw "bad duration"
estimateMusicXSpan: (note, nextNote) ->
duration = @duration(note.duration)
nextDuration =
if nextNote
@duration(nextNote.duration)
else
null
if duration.main is nextDuration?.main
if duration.main < 8
20 + 10 * duration.nDots
else
if duration.nDashes > 0
40 + 40 * duration.nDashes + 20 * duration.nDots
else
20 + 20 * duration.nDots
else
40 + 40 * duration.nDashes + 20 * duration.nDots
estimateLyricsXSpan: (note) ->
if note.lyrics.exists
10 + calculateSize(note.lyrics.content, {font: "Arial", fontSize: "20px"}).width
else
0
estimateXSpan: (note, nextNote) ->
Math.max @estimateMusicXSpan(note, nextNote), @estimateLyricsXSpan(note)
estimateSectionXSpan: (section) ->
if section.length is 0
0
else
offset = 0
for note, i in section
offset += @estimateXSpan(note, section[i + 1])
offset + 20
render: ->
{song, width, height, sectionsPerLine, alignSections, highlight} = @props
heightPerLine = 200
marginBottom = 0
sectionPadding = 20
if not song?
<div />
else
sectionLength = parseFloat(song.time.upper) * 32 / parseFloat(song.time.lower)
offset = 0
sections = []
currentSection = []
for note in song.melody
duration = note.duration
offset += duration
currentSection.push note
if offset % sectionLength is 0
sections.push currentSection
currentSection = []
slurX = slurY = 0
x = y = 0
nSectionsThisLine = 0
computedSections = []
for section, i in sections
startX = x
startY = y
computedNotes = []
for note, j in section
pitch = @analyser.pitch(note.pitch)
duration = @analyser.duration(note.duration)
computedNotes.push
note: note
x: x
y: y
pitch: pitch
duration: duration
x += @analyser.estimateXSpan(note, section[j + 1])
computedSections.push
notes: computedNotes
startX: startX
startY: startY
x: x += sectionPadding
y: y
nSectionsThisLine++
if nSectionsThisLine >= sectionsPerLine
#next line
y += heightPerLine
x = 0
nSectionsThisLine = 0
if alignSections
sectionWidth = (0 for i in [0...sectionsPerLine] by 1)
nSectionsThisLine = 0
for section in computedSections
newWidth = section.x - section.startX
if newWidth > sectionWidth[nSectionsThisLine]
sectionWidth[nSectionsThisLine] = newWidth
nSectionsThisLine = (nSectionsThisLine + 1) % sectionsPerLine
sectionOffsets = [0]
for i in [0...sectionWidth.length] by 1
sectionOffsets[i + 1] = sectionOffsets[i] + sectionWidth[i]
nSectionsThisLine = 0
for section in computedSections
xSpan = section.x - section.startX
newstartX = sectionOffsets[nSectionsThisLine]
newx = sectionOffsets[nSectionsThisLine + 1]
delta = (newx - newstartX - xSpan) / section.notes.length
for noteInfo, i in section.notes
noteInfo.x = (noteInfo.x - section.startX) + delta * (i + 1) + newstartX
section.startX = newstartX
section.x = newx
nSectionsThisLine = (nSectionsThisLine + 1) % sectionsPerLine
for section in computedSections
section.slurs = []
for noteInfo in section.notes
if noteInfo.note.options?
slur = noteInfo.note.options.slur
if slur is "start"
slurX = noteInfo.x + 20
slurY = noteInfo.y + 40 - 10 * noteInfo.pitch.nOctaves
else if slur is "end"
slurEndX = noteInfo.x + 20
slurEndY = noteInfo.y + 40 - 10 * noteInfo.pitch.nOctaves
section.slurs.push [slurX, slurY, slurEndX, slurEndY]
if not width?
nSectionsThisLine = 0
width = -1
lastWidth = 0
for section in computedSections
lastWidth += section.x - section.startX
nSectionsThisLine = nSectionsThisLine + 1
if nSectionsThisLine is sectionsPerLine and width < lastWidth
width = lastWidth
lastWidth = 0
nSectionsThisLine = 0
if nSectionsThisLine < sectionsPerLine - 1 and currentSection.length > 0
lastWidth += @analyser.estimateSectionXSpan(currentSection)
if width < lastWidth
width = lastWidth
width += sectionPadding
if not height?
nLines = Math.ceil((computedSections.length + (if currentSection.length > 0 then 1 else 0)) / sectionsPerLine)
height = nLines * heightPerLine + marginBottom
<svg width={width} height={height}>
<text x={10} y={20} className="signature">{"#{song.key.left}=#{song.key.right} #{song.time.upper}/#{song.time.lower}"}</text>
{
for section, i in computedSections
{notes, slurs} = section
<g key={i}>
{
for noteInfo, j in notes
{note, pitch, duration} = noteInfo
<Jianpu.Note key={j}
note={note}
x={noteInfo.x}
y={noteInfo.y}
pitch={pitch}
duration={duration}
highlight={highlight is note}
/>
}
{
for slur, j in slurs
x1 = slur[0]
y1 = slur[1]
x2 = slur[2]
y2 = slur[3]
ctrl1X = x1+20
ctrl2X = x2-20
if ctrl1X > ctrl2X
ctrl1X = ctrl2X = (x1+x2)/2
<path key={"#{i},#{j}"} className="slur" d="M#{x1},#{y1} C#{ctrl1X},#{y1-20} #{ctrl2X},#{y2-20} #{x2},#{y2}" />
}
{
barX = section.x
barY = section.y
if i is sections.length - 1 and currentSection.length is 0
<g className="doublebar-line">
<line x1={barX - 7} y1={30 + barY} x2={barX - 7} y2={110 + barY} />
<line x1={barX} y1={30 + barY} x2={barX} y2={110 + barY} />
</g>
else
<g className="bar-line">
<line x1={barX} y1={30 + barY} x2={barX} y2={110 + barY} />
</g>
}
</g>
}
{
for note, i in currentSection
pitch = @analyser.pitch(note.pitch)
duration = @analyser.duration(note.duration)
comp = <Jianpu.Note key={i} note={note} x={x} y={y} pitch={pitch} duration={duration}/>
x += @analyser.estimateXSpan(note, section[i + 1])
comp
}
</svg>
Jianpu.Note = React.createClass
render: ->
{note, x, y, pitch, duration, highlight} = @props
{nOctaves, number, accidental} = pitch
{main, nDashes, nDots} = duration
lyrics = note.lyrics
nUnderDashes =
switch main
when 4 then 1
when 2 then 2
when 1 then 3
else 0
accidentalText =
switch accidental
when -2
"♭♭"
when -1
"♭"
when 0
null
when 1
"♯"
when 2
"♯♯"
<g transform={"translate(#{x}, #{y})"}>
{
if highlight
<rect className="highlight" x={5} y={20} width={40 + 40 * nDashes + 10 * nDots} height={100} />
}
{
if accidentalText
<text className="accidental" x={-5} y={80}>{accidentalText}</text>
}
<text className="note" x={10} y={85}>{number}</text>
{
if nOctaves > 0
for i in [0...nOctaves] by 1
<circle key={i} className="octave octave-high" cx={20} cy={40 - 10 * i} r={3.5} />
else if nOctaves < 0
for i in [0...-nOctaves] by 1
<circle key={i} className="octave octave-low" cx={20} cy={110 + nUnderDashes * 5 + 10 * i} r={3.5} />
}
{
for i in [0...nDashes] by 1
<line key={i} className="length-dash" x1={50 + 40 * i} y1={70} x2={40 * i + 70} y2={70} />
}
{
for i in [0...nUnderDashes] by 1
<line key={i} className="length-underline" x1={10} y1={95 + i * 5} x2={30} y2={95 + i * 5} />
}
{
for i in [0...nDots]
<circle key={i} className="length-dot" cx={40 + 40 * nDashes + 10 * i} cy={70} r={3.5} />
}
{
if lyrics.exists
<text className="lyrics" x={10} y={135}>{"#{if lyrics.hyphen then "-" else ""}#{lyrics.content}"}</text>
}
</g>