def _edgePos(self, w=None):
# returns handle position
t = self.roi._homography
n = self.roi.nCells
if w is None:
w = self.roi.width
p = self.pos
return t.map(
QtCore.QPointF(((p[0] - w[1]) / n[1]), (p[1] - w[0]) / n[0]))
def _intersectionPointsAndAngles(r, ratioEllispeRectangle):
'''
return all 8 x and y coords of lines build by intersection of ellipse and rect
'''
w = r.width()
h = r.height()
x1 = 0.5 * w
y2 = 0.5 * h
#ellipse parameters:
a = x1 * ratioEllispeRectangle
b = y2 * ratioEllispeRectangle
#intersection coords in the 1st quadrant with center=(0,0):
y1 = ((1 - x1**2 / a**2) * b**2)**0.5
x2 = ((1 - y2**2 / b**2) * a**2)**0.5
c = r.center()
cx = c.x()
cy = c.y()
#edge points:
p1 = QtCore.QPointF(cx + x1, cy + y1)
p2 = QtCore.QPointF(cx + x2, cy + y2)
p3 = QtCore.QPointF(cx - x2, cy + y2)
p4 = QtCore.QPointF(cx - x1, cy + y1)
p5 = QtCore.QPointF(cx - x1, cy - y1)
p6 = QtCore.QPointF(cx - x2, cy - y2)
p7 = QtCore.QPointF(cx + x2, cy - y2)
p8 = QtCore.QPointF(cx + x1, cy - y1)
#angle in as degree*16 (needed in .drawArc)
a1 = int(QtCore.QLineF(c, p1).angle() * 16)
a2 = int(QtCore.QLineF(c, p2).angle() * 16)
a4 = int(QtCore.QLineF(c, p4).angle() * 16)
a6 = int(QtCore.QLineF(c, p6).angle() * 16)
a8 = int(QtCore.QLineF(c, p8).angle() * 16)
arc_length = a1 - a2
return (p1, p2, p3, p4, p5, p6, p7, p8), (a2, a4, a6, a8), arc_length
def homography(self):
t = QtGui.QTransform()
poly = QtGui.QPolygonF([QtCore.QPointF(*v) for v in self.vertices()])
QtGui.QTransform.squareToQuad(poly, t)
self._homography = t
return t