235 lines
7.5 KiB
Python
235 lines
7.5 KiB
Python
# pylint: disable=too-many-locals,too-many-arguments,too-many-function-args
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"""
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Usage
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-----
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>>> import qtidenticon
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>>> qtidenticon.render_identicon(code, size)
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Return a PIL Image class instance which have generated identicon image.
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``size`` specifies `patch size`. Generated image size is 3 * ``size``.
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"""
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from PyQt4 import QtGui
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from PyQt4.QtCore import QPointF, QSize, Qt
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from PyQt4.QtGui import QPainter, QPixmap, QPolygonF
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class IdenticonRendererBase(object):
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"""Encapsulate methods around rendering identicons"""
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PATH_SET = []
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def __init__(self, code):
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"""
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:param code: code for icon
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"""
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if not isinstance(code, int):
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code = int(code)
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self.code = code
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def render(self, size, twoColor, opacity, penwidth):
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"""
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render identicon to QPicture
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:param size: identicon patchsize. (image size is 3 * [size])
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:returns: :class:`QPicture`
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"""
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# decode the code
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middle, corner, side, foreColor, secondColor, swap_cross = self.decode(self.code, twoColor)
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# make image
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image = QPixmap(QSize(size * 3 + penwidth, size * 3 + penwidth))
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# fill background
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backColor = QtGui.QColor(255, 255, 255, opacity)
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image.fill(backColor)
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kwds = {
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'image': image,
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'size': size,
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'foreColor': foreColor if swap_cross else secondColor,
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'penwidth': penwidth,
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'backColor': backColor}
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# middle patch
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image = self.drawPatchQt((1, 1), middle[2], middle[1], middle[0], **kwds)
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# side patch
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kwds['foreColor'] = foreColor
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kwds['patch_type'] = side[0]
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for i in xrange(4):
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pos = [(1, 0), (2, 1), (1, 2), (0, 1)][i]
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image = self.drawPatchQt(pos, side[2] + 1 + i, side[1], **kwds)
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# corner patch
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kwds['foreColor'] = secondColor
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kwds['patch_type'] = corner[0]
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for i in xrange(4):
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pos = [(0, 0), (2, 0), (2, 2), (0, 2)][i]
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image = self.drawPatchQt(pos, corner[2] + 1 + i, corner[1], **kwds)
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return image
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def drawPatchQt(self, pos, turn, invert, patch_type, image, size, foreColor,
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backColor, penwidth): # pylint: disable=unused-argument
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"""
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:param size: patch size
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"""
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path = self.PATH_SET[patch_type]
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if not path:
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# blank patch
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invert = not invert
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path = [(0., 0.), (1., 0.), (1., 1.), (0., 1.), (0., 0.)]
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polygon = QPolygonF([QPointF(x * size, y * size) for x, y in path])
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rot = turn % 4
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rect = [QPointF(0., 0.), QPointF(size, 0.), QPointF(size, size), QPointF(0., size)]
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rotation = [0, 90, 180, 270]
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nopen = QtGui.QPen(foreColor, Qt.NoPen)
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foreBrush = QtGui.QBrush(foreColor, Qt.SolidPattern)
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if penwidth > 0:
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pen_color = QtGui.QColor(255, 255, 255)
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pen = QtGui.QPen(pen_color, Qt.SolidPattern)
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pen.setWidth(penwidth)
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painter = QPainter()
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painter.begin(image)
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painter.setPen(nopen)
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painter.translate(pos[0] * size + penwidth / 2, pos[1] * size + penwidth / 2)
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painter.translate(rect[rot])
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painter.rotate(rotation[rot])
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if invert:
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# subtract the actual polygon from a rectangle to invert it
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poly_rect = QPolygonF(rect)
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polygon = poly_rect.subtracted(polygon)
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painter.setBrush(foreBrush)
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if penwidth > 0:
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# draw the borders
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painter.setPen(pen)
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painter.drawPolygon(polygon, Qt.WindingFill)
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# draw the fill
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painter.setPen(nopen)
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painter.drawPolygon(polygon, Qt.WindingFill)
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painter.end()
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return image
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def decode(self, code, twoColor):
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"""virtual functions"""
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raise NotImplementedError
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class DonRenderer(IdenticonRendererBase):
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"""
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Don Park's implementation of identicon
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see: http://www.docuverse.com/blog/donpark/2007/01/19/identicon-updated-and-source-released
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"""
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PATH_SET = [
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# [0] full square:
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[(0, 0), (4, 0), (4, 4), (0, 4)],
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# [1] right-angled triangle pointing top-left:
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[(0, 0), (4, 0), (0, 4)],
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# [2] upwardy triangle:
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[(2, 0), (4, 4), (0, 4)],
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# [3] left half of square, standing rectangle:
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[(0, 0), (2, 0), (2, 4), (0, 4)],
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# [4] square standing on diagonale:
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[(2, 0), (4, 2), (2, 4), (0, 2)],
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# [5] kite pointing topleft:
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[(0, 0), (4, 2), (4, 4), (2, 4)],
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# [6] Sierpinski triangle, fractal triangles:
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[(2, 0), (4, 4), (2, 4), (3, 2), (1, 2), (2, 4), (0, 4)],
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# [7] sharp angled lefttop pointing triangle:
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[(0, 0), (4, 2), (2, 4)],
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# [8] small centered square:
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[(1, 1), (3, 1), (3, 3), (1, 3)],
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# [9] two small triangles:
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[(2, 0), (4, 0), (0, 4), (0, 2), (2, 2)],
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# [10] small topleft square:
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[(0, 0), (2, 0), (2, 2), (0, 2)],
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# [11] downpointing right-angled triangle on bottom:
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[(0, 2), (4, 2), (2, 4)],
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# [12] uppointing right-angled triangle on bottom:
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[(2, 2), (4, 4), (0, 4)],
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# [13] small rightbottom pointing right-angled triangle on topleft:
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[(2, 0), (2, 2), (0, 2)],
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# [14] small lefttop pointing right-angled triangle on topleft:
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[(0, 0), (2, 0), (0, 2)],
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# [15] empty:
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[]]
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# get the [0] full square, [4] square standing on diagonale, [8] small centered square, or [15] empty tile:
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MIDDLE_PATCH_SET = [0, 4, 8, 15]
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# modify path set
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for idx in xrange(len(PATH_SET)):
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if PATH_SET[idx]:
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p = [(vec[0] / 4.0, vec[1] / 4.0) for vec in PATH_SET[idx]]
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PATH_SET[idx] = p + p[:1]
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def decode(self, code, twoColor):
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"""decode the code"""
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shift = 0
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middleType = (code >> shift) & 0x03
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shift += 2
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middleInvert = (code >> shift) & 0x01
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shift += 1
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cornerType = (code >> shift) & 0x0F
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shift += 4
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cornerInvert = (code >> shift) & 0x01
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shift += 1
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cornerTurn = (code >> shift) & 0x03
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shift += 2
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sideType = (code >> shift) & 0x0F
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shift += 4
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sideInvert = (code >> shift) & 0x01
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shift += 1
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sideTurn = (code >> shift) & 0x03
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shift += 2
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blue = (code >> shift) & 0x1F
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shift += 5
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green = (code >> shift) & 0x1F
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shift += 5
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red = (code >> shift) & 0x1F
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shift += 5
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second_blue = (code >> shift) & 0x1F
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shift += 5
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second_green = (code >> shift) & 0x1F
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shift += 5
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second_red = (code >> shift) & 0x1F
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shift += 1
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swap_cross = (code >> shift) & 0x01
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middleType = self.MIDDLE_PATCH_SET[middleType]
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foreColor = (red << 3, green << 3, blue << 3)
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foreColor = QtGui.QColor(*foreColor)
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if twoColor:
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secondColor = (second_blue << 3, second_green << 3, second_red << 3)
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secondColor = QtGui.QColor(*secondColor)
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else:
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secondColor = foreColor
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return (middleType, middleInvert, 0),\
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(cornerType, cornerInvert, cornerTurn),\
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(sideType, sideInvert, sideTurn),\
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foreColor, secondColor, swap_cross
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def render_identicon(code, size, twoColor=False, opacity=255, penwidth=0, renderer=None):
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"""Render an image"""
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if not renderer:
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renderer = DonRenderer
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return renderer(code).render(size, twoColor, opacity, penwidth)
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