本文整理汇总了Python中PyQt4.QtCore.QLineF.fromPolar方法的典型用法代码示例。如果您正苦于以下问题：Python QLineF.fromPolar方法的具体用法？Python QLineF.fromPolar怎么用？Python QLineF.fromPolar使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类PyQt4.QtCore.QLineF的用法示例。
在下文中一共展示了QLineF.fromPolar方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: _updateTextAnchors
# 需要导入模块: from PyQt4.QtCore import QLineF [as 别名]
# 或者: from PyQt4.QtCore.QLineF import fromPolar [as 别名]
def _updateTextAnchors(self):
n = len(self._items)
items = self._items
dist = 15
shape = reduce(QPainterPath.united, [item.path() for item in items])
brect = shape.boundingRect()
bradius = max(brect.width() / 2, brect.height() / 2)
center = self.boundingRect().center()
anchors = _category_anchors(items)
self._textanchors = []
for angle, anchor_h, anchor_v in anchors:
line = QLineF.fromPolar(bradius, angle)
ext = QLineF.fromPolar(dist, angle)
line = QLineF(line.p1(), line.p2() + ext.p2())
line = line.translated(center)
anchor_pos = line.p2()
self._textanchors.append((anchor_pos, anchor_h, anchor_v))
for i in range(n):
self._updateTextItemPos(i)示例2: paint
# 需要导入模块: from PyQt4.QtCore import QLineF [as 别名]
# 或者: from PyQt4.QtCore.QLineF import fromPolar [as 别名]
def paint(self, painter):
pen = QPen(Qt.black)
pen.setWidthF(2.5)
painter.setPen(pen)
line = QLineF(self.startPoint, self.pos)
painter.drawLine(line)
if self.pos != self.startPoint:
#draw arrowhead
a = line.angle()
l1 = QLineF.fromPolar(25, a - 155)
l1.translate(self.pos)
l2 = QLineF.fromPolar(25, a + 155)
l2.translate(self.pos)
painter.drawLine(l1)
painter.drawLine(l2)示例3: arrow_path_concave
# 需要导入模块: from PyQt4.QtCore import QLineF [as 别名]
# 或者: from PyQt4.QtCore.QLineF import fromPolar [as 别名]
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示例4: arrow_path_plain
# 需要导入模块: from PyQt4.QtCore import QLineF [as 别名]
# 或者: from PyQt4.QtCore.QLineF import fromPolar [as 别名]
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