def set(self, U=None, vmin=None, vmax=None):
# normalize U
fm = QFontMetrics(self.font())
self.vmin = vmin if vmin is not None else (
np.min(U) if U is not None else 0.)
self.vmax = vmax if vmax is not None else (
np.max(U) if U is not None else 1.)
difference = abs(self.vmin - self.vmax)
if difference == 0:
precision = 3
else:
precision = m.log(
max(abs(self.vmin), abs(self.vmax)) / difference, 10) + 1
precision = int(min(max(precision, 3), 8))
self.vmin_str = format(
('{:.' + str(precision) + '}').format(self.vmin))
self.vmax_str = format(
('{:.' + str(precision) + '}').format(self.vmax))
self.vmin_width = fm.width(self.vmin_str)
self.vmax_width = fm.width(self.vmax_str)
self.text_height = fm.height() * 1.5
self.text_ascent = fm.ascent() * 1.5
self.text_descent = fm.descent() * 1.5
self.setMinimumSize(
max(self.vmin_width, self.vmax_width) + 20, 300)
self.update()
def minLabelDist(self, font):
"""
Determine the minimum distance between two labels, that is necessary
that the texts don't overlap.
:param QFont font: Font
:return: The maximum width of a label
.. seealso::
:py:meth:`getBorderDistHint()`
"""
if not self.hasComponent(QwtAbstractScaleDraw.Labels):
return 0
ticks = self.scaleDiv().ticks(QwtScaleDiv.MajorTick)
if not ticks:
return 0
fm = QFontMetrics(font)
vertical = self.orientation() == Qt.Vertical
bRect1 = QRectF()
bRect2 = self.labelRect(font, ticks[0])
if vertical:
bRect2.setRect(-bRect2.bottom(), 0.0, bRect2.height(),
bRect2.width())
maxDist = 0.0
for tick in ticks:
bRect1 = bRect2
bRect2 = self.labelRect(font, tick)
if vertical:
bRect2.setRect(-bRect2.bottom(), 0.0, bRect2.height(),
bRect2.width())
dist = fm.leading()
if bRect1.right() > 0:
dist += bRect1.right()
if bRect2.left() < 0:
dist += -bRect2.left()
if dist > maxDist:
maxDist = dist
angle = qwtRadians(self.labelRotation())
if vertical:
angle += math.pi / 2
sinA = math.sin(angle)
if qFuzzyCompare(sinA + 1.0, 1.0):
return math.ceil(maxDist)
fmHeight = fm.ascent() - 2
labelDist = fmHeight / math.sin(angle) * math.cos(angle)
if labelDist < 0:
labelDist = -labelDist
if labelDist > maxDist:
labelDist = maxDist
if labelDist < fmHeight:
labelDist = fmHeight
return math.ceil(labelDist)
