def arrow_path_concave(line, width):
"""
Return a :class:`QPainterPath` of a pretty looking arrow.
"""
path = QPainterPath()
p1, p2 = line.p1(), line.p2()
if p1 == p2:
return path
baseline = QLineF(line)
# Require some minimum length.
baseline.setLength(max(line.length() - width * 3, width * 3))
start, end = baseline.p1(), baseline.p2()
mid = (start + end) / 2.0
normal = QLineF.fromPolar(1.0, baseline.angle() + 90).p2()
path.moveTo(start)
path.lineTo(start + (normal * width / 4.0))
path.quadTo(mid + (normal * width / 4.0),
end + (normal * width / 1.5))
path.lineTo(end - (normal * width / 1.5))
path.quadTo(mid - (normal * width / 4.0),
start - (normal * width / 4.0))
path.closeSubpath()
arrow_head_len = width * 4
arrow_head_angle = 50
line_angle = line.angle() - 180
angle_1 = line_angle - arrow_head_angle / 2.0
angle_2 = line_angle + arrow_head_angle / 2.0
points = [p2,
p2 + QLineF.fromPolar(arrow_head_len, angle_1).p2(),
baseline.p2(),
p2 + QLineF.fromPolar(arrow_head_len, angle_2).p2(),
p2]
poly = QPolygonF(points)
path_head = QPainterPath()
path_head.addPolygon(poly)
path = path.united(path_head)
return path
def arrow_path_concave(line, width):
"""
Return a :class:`QPainterPath` of a pretty looking arrow.
"""
path = QPainterPath()
p1, p2 = line.p1(), line.p2()
if p1 == p2:
return path
baseline = QLineF(line)
# Require some minimum length.
baseline.setLength(max(line.length() - width * 3, width * 3))
start, end = baseline.p1(), baseline.p2()
mid = (start + end) / 2.0
normal = QLineF.fromPolar(1.0, baseline.angle() + 90).p2()
path.moveTo(start)
path.lineTo(start + (normal * width / 4.0))
path.quadTo(mid + (normal * width / 4.0), end + (normal * width / 1.5))
path.lineTo(end - (normal * width / 1.5))
path.quadTo(mid - (normal * width / 4.0), start - (normal * width / 4.0))
path.closeSubpath()
arrow_head_len = width * 4
arrow_head_angle = 50
line_angle = line.angle() - 180
angle_1 = line_angle - arrow_head_angle / 2.0
angle_2 = line_angle + arrow_head_angle / 2.0
points = [
p2, p2 + QLineF.fromPolar(arrow_head_len, angle_1).p2(),
baseline.p2(), p2 + QLineF.fromPolar(arrow_head_len, angle_2).p2(), p2
]
poly = QPolygonF(points)
path_head = QPainterPath()
path_head.addPolygon(poly)
path = path.united(path_head)
return path
def arrow_path_plain(line, width):
"""
Return an :class:`QPainterPath` of a plain looking arrow.
"""
path = QPainterPath()
p1, p2 = line.p1(), line.p2()
if p1 == p2:
return path
baseline = QLineF(line)
# Require some minimum length.
baseline.setLength(max(line.length() - width * 3, width * 3))
path.moveTo(baseline.p1())
path.lineTo(baseline.p2())
stroker = QPainterPathStroker()
stroker.setWidth(width)
path = stroker.createStroke(path)
arrow_head_len = width * 4
arrow_head_angle = 50
line_angle = line.angle() - 180
angle_1 = line_angle - arrow_head_angle / 2.0
angle_2 = line_angle + arrow_head_angle / 2.0
points = [
p2,
p2 + QLineF.fromPolar(arrow_head_len, angle_1).p2(),
p2 + QLineF.fromPolar(arrow_head_len, angle_2).p2(),
p2,
]
poly = QPolygonF(points)
path_head = QPainterPath()
path_head.addPolygon(poly)
path = path.united(path_head)
return path
def arrow_path_plain(line, width):
"""
Return an :class:`QPainterPath` of a plain looking arrow.
"""
path = QPainterPath()
p1, p2 = line.p1(), line.p2()
if p1 == p2:
return path
baseline = QLineF(line)
# Require some minimum length.
baseline.setLength(max(line.length() - width * 3, width * 3))
path.moveTo(baseline.p1())
path.lineTo(baseline.p2())
stroker = QPainterPathStroker()
stroker.setWidth(width)
path = stroker.createStroke(path)
arrow_head_len = width * 4
arrow_head_angle = 50
line_angle = line.angle() - 180
angle_1 = line_angle - arrow_head_angle / 2.0
angle_2 = line_angle + arrow_head_angle / 2.0
points = [
p2, p2 + QLineF.fromPolar(arrow_head_len, angle_1).p2(),
p2 + QLineF.fromPolar(arrow_head_len, angle_2).p2(), p2
]
poly = QPolygonF(points)
path_head = QPainterPath()
path_head.addPolygon(poly)
path = path.united(path_head)
return path
def _write(self, shapes, svg_file, width, height, stroke_colour = None, stroke_width = None, background_colour = None):
svg_file.write('<?xml version="1.0" standalone="no"?>\n'
'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"\n'
' "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n')
svg_file.write('<svg width="%.6fcm" height="%.6fcm" ' % (width, height))
svg_file.write('viewBox="%.6f %.6f %.6f %.6f" '
'xmlns="http://www.w3.org/2000/svg" '
'version="1.1">\n' % (0.0, 0.0, width, height))
if stroke_width is None:
stroke_width = "0.1%"
if background_colour is not None:
svg_file.write('<polygon fill="%s" ' % background_colour)
svg_file.write('points="%.6f,%.6f %.6f,%.6f %.6f,%.6f %.6f,%.6f" />\n' % (
0.0, 0.0, width, 0.0, width, height, 0.0, height))
path = QPainterPath()
shapes.reverse()
new_shapes = {}
for points, polygon in shapes:
rgb = self.parts.colours.get(polygon.colour, "#ffffff")
new_points = []
for x, y in points:
new_points.append(QPointF(x + width/2.0, height/2.0 - y))
new_polygon = QPolygonF(new_points)
new_path = QPainterPath()
new_path.addPolygon(new_polygon)
if path.contains(new_path):
continue
inter = path.intersected(new_path)
remaining = new_path.subtracted(inter)
# Combine the new path with the accumulated path and simplify
# the result.
path = path.united(new_path)
path = path.simplified()
piece_dict = new_shapes.setdefault(polygon.piece, {})
colour_path = piece_dict.get(polygon.colour, QPainterPath())
piece_dict[polygon.colour] = colour_path.united(remaining)
for piece, piece_dict in new_shapes.items():
svg_file.write('<g>\n')
for colour, colour_path in piece_dict.items():
if colour_path.isEmpty():
continue
rgb = self.parts.colours.get(colour, "#ffffff")
shape = '<path style="fill:%s; opacity:%f" d="' % (
rgb, self._opacity_from_colour(colour))
i = 0
in_path = False
while i < colour_path.elementCount():
p = colour_path.elementAt(i)
if p.type == QPainterPath.MoveToElement:
if in_path:
shape += 'Z '
shape += 'M %.6f %.6f ' % (p.x, p.y)
in_path = True
elif p.type == QPainterPath.LineToElement:
shape += 'L %.6f %.6f ' % (p.x, p.y)
i += 1
if in_path:
shape += 'Z'
shape += '" />\n'
svg_file.write(shape)
svg_file.write('</g>\n')
svg_file.write("</svg>\n")
svg_file.close()