def drawStructure(self, W, H, wEff):
"""
Генерация изображения со структурой
:type H: int
:type W: int
:type wEff: int
"""
lines = sum(x.repeats * len(x.progressions) for x in self._structure)
extraH = settings.STRUCTURE_LINE_SPACE * (lines + len(self._structure) - 1) + settings.STRUCTURE_GROUP_SPACE * (
len(self._structure) - 1
)
lineH = (H - extraH) // (lines + len(self._structure))
maxBarSize = max(progression.length() for section in self._structure for progression in section.progressions)
im = Image.new("RGBA", (W, H))
draw = ImageDraw.Draw(im)
font = ImageFont.truetype(os.path.join("res", "DejaVuSans.ttf"), int(lineH * 0.9))
draw.setfont(font)
yPos = 0
for section in self._structure:
title = section.title
if section.repeats > 1:
title += " x%d" % section.repeats
draw.text((4, yPos), title)
yPos += lineH + settings.STRUCTURE_LINE_SPACE
for progression in section.progressions:
xPos = 0
pos = Length(0, 1)
for chord in progression.chords:
pos += chord.length
barX = 2 * pos.count(maxBarSize) * wEff // 3
draw.rectangle([(xPos, yPos), (barX, yPos + lineH)], outline="black", fill=str(chord.color))
xPos = barX
xPos = 2 * wEff // 3
title = [
x for x in [progression.title, "x%d" % progression.repeats if progression.repeats > 1 else ""] if x
]
draw.text((xPos + 4, int(round(yPos + lineH * 0.05))), " ".join(title))
yPos += settings.STRUCTURE_LINE_SPACE + lineH
yPos += settings.STRUCTURE_GROUP_SPACE
del draw
return im
def processStructure(cls, structureElement, signature):
"""
Генерация элементов RawChord
Необходимо расчитать размер в долях
:type structureElement: xml.dom.minidom.Element
:type signature: Length
:rtype: None
"""
length = getAttr(structureElement, 'length', True, Length.make_validator(signature))
chord = structureElement.getAttribute('name')
if structureElement.tagName == 'chord':
return RawChord(chord, length)
else:
raise ParseException(u"Элемент %s не может содержать элемент %s" % (structureElement.parentNode.tagName, structureElement.tagName))
def processElement(self, element):
"""
Специфичная для класса обработка элемента
Конструрием элементы из аттрибутов элемента
:type element: xml.dom.minidom.Element
:rtype: None
"""
id = element.getAttribute('id')
signature = getAttr(element, 'signature', False, Length.make_validator(), Length(4,4))
title = element.getAttribute('title')
key = getAttr(element, 'key', False, validator_key)
chords = [self.processStructure(x, signature) for x in iterElements(element)]
if not chords:
raise ParseException(u"Последовательность %s пуста" % id)
self.validate(id, chords, signature)
self.values[id] = Progression(signature, title, chords, key)
