def __get_bezier_middle_angle(self, bezier: QPainterPath):
"""
Get the angle in the middle of a bezier curve.
"""
percent_middle = bezier.percentAtLength(
bezier.length() / 2)
return -math.radians(
bezier.angleAtPercent(percent_middle))
def drawTextAlongCubic(self, lay, painter, filename, msg):
fs = lay["defaultFontSize"]
font = QFont('Right Chalk', fs)
defaultMessage = msg
if len(msg) == 0:
return
c1 = QPointF(lay["x1"], lay["y1"])
c2 = QPointF(lay["x2"], lay["y2"])
c3 = QPointF(lay["x3"], lay["y3"])
c4 = QPointF(lay["x4"], lay["y4"])
path = QPainterPath(c1)
path.cubicTo(c2, c3, c4)
# painter.drawPath(path)
pathLength = path.length()
textMetricLength = QFontMetrics(font).width(defaultMessage)
fsn = int(fs * pathLength / (textMetricLength) * .95)
if fsn > 70:
fsn = 70
font = QFont('Right Chalk', fsn)
textMetricLength = QFontMetrics(font).width(defaultMessage)
messageSpacing = []
defaultMessageM = []
sumMessageSpacing = 0.0
for i in range(len(defaultMessage)):
messageSpacing.append(QFontMetrics(font).width(defaultMessage[i]))
sumMessageSpacing += messageSpacing[i]
for i in range(len(defaultMessage)):
messageSpacing[i] = messageSpacing[i] / sumMessageSpacing
steps = 0
painter.setFont(font)
for i in range(len(defaultMessage)):
steps += messageSpacing[i] / 2
point = QPointF(path.pointAtPercent(steps))
angle = path.angleAtPercent(steps)
painter.save()
painter.translate(point)
painter.rotate(-angle)
x = -QFontMetrics(font).width(defaultMessage[i]) / 2
y = -QFontMetrics(font).height() / 2
w = QFontMetrics(font).width(defaultMessage[i])
h = QFontMetrics(font).height()
r = QRectF(x, y, w, h)
painter.setPen(QPen(Qt.white, 2))
painter.drawText(r, defaultMessage[i])
if i % 2 == 0:
painter.setPen(QPen(Qt.red, 2))
else:
painter.setPen(QPen(Qt.green, 2))
# painter.drawRect(r)
painter.restore()
steps += messageSpacing[i] / 2
