def crosses(self, other):
"""
Returns True if this wire and the |other| wire intersect, False otherwise.
"""
assert isinstance(other, Wire), 'other must be a Wire'
return intersect((self.loc_1, self.loc_2), (other.loc_1,
other.loc_2)) != False
def crosses(self, other):
"""
Returns True if this wire and the |other| wire intersect, False otherwise.
"""
assert isinstance(other, Wire), 'other must be a Wire'
return intersect((self.loc_1, self.loc_2),
(other.loc_1, other.loc_2)) != False
def create_wire(canvas, x1, y1, x2, y2, other_wires, directed=True,
color=WIRE_COLOR):
"""
Draws a piece of a wire on the |canvas| pointing from (|x1|, |y1|) to
(|x2|, |y2|). The two end points must define a horizontal or vertical
line. If the piece intersects any of the |other_wires|, marks the
intersections. If |directed| is True, the drawn piece will have an arrow.
Returns a list of the canvas ids of the lines the wire is composed of.
"""
assert isinstance(canvas, Canvas), 'canvas must be a Canvas'
assert x1 == x2 or y1 == y2, 'wire piece must be horizontal or vertical'
parts = []
if x1 == x2 and y1 == y2:
return parts
intersection_points = []
for wire in other_wires:
for i in xrange(len(wire.path) - 1):
intersection = intersect(((x1, y1), (x2, y2)), (wire.path[i],
wire.path[i + 1]))
if intersection not in (False, 'collinear', (x1, y1), (x2, y2)):
intersection_points.append(intersection)
intersection_points.sort(key=lambda (x, y): (x - x1) / (x2 - x1) if x1 != x2
else (y - y1) / (y2 - y1))
last_point = (x1, y1)
if intersection_points:
h = ((x2 - x1) ** 2 + (y2 - y1) ** 2) ** 0.5
dx = WIRE_INTERSECT_MARKER_SIZE * (x2 - x1) / h
dy = WIRE_INTERSECT_MARKER_SIZE * (y2 - y1) / h
for (x, y) in intersection_points:
_x, _y = x - dx, y - dy
x_, y_ = x + dx, y + dy
xm, ym = _x + dx - sqrt(3) * dy, _y + sqrt(3) * dx + dy
parts.append(canvas.create_line(last_point, (_x, _y), fill=color,
width=WIRE_WIDTH))
parts.append(canvas.create_line(_x, _y, xm, ym, x_, y_, fill=color,
width=WIRE_WIDTH, smooth=True))
last_point = (x_, y_)
parts.append(canvas.create_line(last_point, (x2, y2), fill=color,
width=WIRE_WIDTH))
if directed:
wire_angle = atan2(y2 - y1, x2 - x1)
arrow_angle_1 = wire_angle + 3 * pi / 4
parts.append(canvas.create_line(x2, y2, x2 + WIRE_ARROW_LENGTH *
cos(arrow_angle_1), y2 + WIRE_ARROW_LENGTH * sin(arrow_angle_1),
fill=color, width=WIRE_WIDTH))
arrow_angle_2 = wire_angle + 5 * pi / 4
parts.append(canvas.create_line(x2, y2, x2 + WIRE_ARROW_LENGTH *
cos(arrow_angle_2), y2 + WIRE_ARROW_LENGTH * sin(arrow_angle_2),
fill=color, width=WIRE_WIDTH))
return parts
