def closestBoundaryPos(self, pos):
rect = self.boundingRect()
#s = self._boundScale
#T = QTransform.fromScale(1/s[0], 1/s[1])
#rect = T.mapRect(rect)
if pos.x() < rect.left():
x = rect.left()
elif pos.x() > rect.right():
x = rect.right()
else:
x = pos.x()
if pos.y() < rect.top():
y = rect.top()
elif pos.y() > rect.bottom():
y = rect.bottom()
else:
y = pos.y()
rect_point = QPointF(x, y)
r = self.cornerRadius()
poly = None
if mag2D(rect_point - rect.bottomRight()) <= r:
poly = polygonFromArc(rect.bottomRight() + QPointF(-r, -r),
r,
0,
90,
seg=30)
elif mag2D(rect_point - rect.topRight()) <= r:
poly = polygonFromArc(rect.topRight() + QPointF(-r, r),
r,
270,
360,
seg=30)
elif mag2D(rect_point - rect.topLeft()) <= r:
poly = polygonFromArc(rect.topLeft() + QPointF(r, r),
r,
180,
270,
seg=30)
elif mag2D(rect_point - rect.bottomLeft()) <= r:
poly = polygonFromArc(rect.bottomLeft() + QPointF(r, -r),
r,
90,
180,
seg=30)
if poly is None:
return rect_point
else:
return closestPolyPoint(poly, pos)[0]
def tailPath(self):
path = QPainterPath()
path.moveTo(self._points[-1].pos())
line = self.tailLine()
u = line.p2() - line.p1()
v = QPointF(u.y(), -u.x())
mag_u = mag2D(u)
if abs(mag_u) != 0:
if self._firstTimeNonzero:
self._firstTimeNonzero = False
label = self.label(-1)
if label:
label.setPos(self.pointCenter())
u /= mag_u
v /= mag_u
r = self.arrowHeadSize()
if self._mono:
line_end = line.p1() + u * r
else:
line_end = line.p1()
if not self.isBezier():
path.lineTo(line_end)
else:
path.cubicTo(self._points[-2].pos(), self._points[-3].pos(),
line_end)
if self._mono:
perp_end = 1.5 * r * v
path.cubicTo(line.p1(), line.p1() + perp_end, line_end + perp_end)
return path
def updateArrowHead(self):
line = self.line()
if not self.isBezier():
if self._reversed:
u = line.p1() - line.p2()
else:
u = line.p2() - line.p1()
else:
if self._reversed:
u = self._points[0].pos() - self._points[1].pos()
else:
u = self._points[-1].pos() - self._points[-2].pos()
mag_u = mag2D(u)
if mag_u == 0.0:
self._arrowHead = QPainterPath()
return
u /= mag_u
v = QPointF(-u.y(), u.x()) # perp vector
path = QPainterPath()
if self._reversed:
tip = line.p1()
else:
tip = line.p2()
size = self.arrowHeadSize()
p = tip - (u + v) * size
q = tip + (v - u) * size
r = tip - u * size
path.moveTo(p)
path.quadTo((p + tip + r) / 3, tip)
path.quadTo((q + tip + r) / 3, q)
self._arrowHead = path
def closestBoundaryPos(self, pos):
rect = self.boundingRect()
radius = rect.width() / 2
v = pos - rect.center()
mag = mag2D(v)
if abs(mag) == 0:
return rect.topLeft()
return v / mag * radius
def _paintEpiHead(self, painter):
path = QPainterPath()
path.moveTo(QPointF(0, 0))
path.addPath(self._arrowHead)
line = self.headLine()
u = line.p1() - line.p2()
mag_u = mag2D(u)
if mag_u != 0:
u /= mag_u
path.addPath(self._arrowHead.translated(u * self.arrowHeadSize()))
painter.drawPath(path)
def setLinePoints(self, pos0, pos1):
u = pos1 - pos0
mag_u = mag2D(u)
if mag_u == 0.0:
for k in range(0, len(self._points)):
self._points[k].setPos(pos0)
return
u /= mag_u
u *= mag_u / (len(self._points) - 1)
for k in range(0, len(self._points)):
self._points[k].setPos(pos0 + k * u)
self.updateArrowHead()
self.update()
def saveTextPosition(self, k=None):
line = self.line()
u = line.p2() - line.p1()
mag_u = mag2D(u)
if mag_u != 0:
u /= mag_u
v = QPointF(-u.y(), u.x())
if k is not None:
label = self._labels[k]
a = label.pos() - line.p1()
self._textPos[k] = (dot2D(a, u), dot2D(a, v), mag_u)
else:
for k in range(len(self._labels)):
label = self._labels[k]
a = label.pos() - line.p1()
a_proj_u = dot2D(a, u)
a_proj_v = dot2D(a, v)
self._textPos[k] = (a_proj_u, a_proj_v, mag_u)
def updateTextPosition(self):
line = self.line()
u = line.p2() - line.p1()
mag_u1 = mag2D(u)
u /= mag_u1
v = QPointF(-u.y(), u.x())
for k in range(len(self._labels)):
pos = self._textPos[k]
label = self._labels[k]
a_proj_u = pos[0]
a_proj_v = pos[1]
mag_u = pos[2]
if mag_u == 0.0:
f = 1.0
else:
f = mag_u1 / mag_u
a_proj_u *= f
v_a = v * a_proj_v
u_a = u * a_proj_u
a = line.p1() + u_a + v_a
label.setPos(a)
self.saveTextPosition()
def shape(self):
if len(self._points) == 2:
path = QPainterPath()
u = self.line().p2() - self.line().p1()
u /= mag2D(u)
v = QPointF(-u.y(), u.x()) # perp vector
v *= self.arrowHeadSize()
p1 = self.line().p1()
p2 = self.line().p2()
size = self.arrowHeadSize()
poly = QPolygonF([p1 + v, p1 - v, p2 - v, p2 + v, p1 + v])
path.addPolygon(poly)
return path
else:
path = QPainterPath()
path.moveTo(self._points[0].pos())
path.cubicTo(self._points[1].pos(), self._points[2].pos(),
self._points[3].pos())
stroker = QPainterPathStroker(
QPen(Qt.black,
self.arrowHeadSize() * 2))
return stroker.createStroke(path)
def sceneEventFilter(self, watched, event):
if event.type() == QEvent.GraphicsSceneMouseMove and mag2D(
event.scenePos() - event.lastScenePos()) > 1:
self.updateArrows()
self.scene().update()
return False