def _loadFile(self, source):
if not os.path.isfile(source):
raise ShapeException('Source image not found')
try:
return mpimg.imread(source)
except Exception as e:
raise ShapeException(e)
def __init__(self, *args, **kwargs):
try:
if not self.__constructWithPoints(args[0], args[1]):
if not self.__constructWithCoords(args[0], args[1], args[2],
args[3]):
raise ShapeException("Line Construction Failed")
except IndexError: # If no construction method works, raise an exception
raise ShapeException("Invalid arguments for line construction")
def validateSource(source):
"""Validate a source for an image"""
if not os.path.isfile(source):
raise ShapeException('Source image not found')
try:
if imghdr.what(source) not in VALID_IMAGES:
raise ShapeException('Source is not a valid image.')
except TypeError:
raise ShapeException('Source is not a valid image.')
def __init__(self, *args, **kwargs):
try:
if not self.__constructWithPoints(args[0], args[1], args[2]):
if not self.__constructWithLines(args[0], args[1], args[2]):
if not self.__constructWithCoords(
args[0], args[1], args[2], args[3], args[4],
args[5]):
raise ShapeException("Triangle construction failed")
except IndexError:
raise ShapeException("Invalid arguments for triangle construction")
def __init__(self, *args, **kwargs):
"""Expects arguments as center, focus1, focus2, edge1, edge2"""
try:
if not self.__constructWithPoints(args[0], args[1], args[2],
args[3], args[4]):
if not self.__constructWithCoords(
args[0], args[1], args[2], args[3], args[4], args[5],
args[6], args[7], args[8], args[9]):
raise ShapeException("Ellipse construction failed")
except IndexError:
raise ShapeException("Invalid arguments for ellipse construction")
def __init__(self, *args, **kwargs):
try: # Construct with x1, y1, x2, y2, x3, y3, x4, y4
if not self.__constructWithPoints(args[0], args[1], args[2],
args[3]):
if not self.__constructWithLines(args[0], args[1], args[2],
args[3]):
if not self.__constructWithCoords(
args[0], args[1], args[2], args[3], args[4],
args[5], args[6], args[7]):
raise ShapeException("Rectangle construction failed")
except IndexError:
raise ShapeException("Invalid arguments for shape construction")
def validateEllipse(value, errorMessage):
if not isinstance(value, Ellipse):
raise ShapeException(errorMessage)
Line.validateLine(value.axis1, "Axis1 is not a valid line")
Line.validateLine(value.axis2, "Axis2 is not a valid line")
if value.computeArea() <= 0:
raise ShapeException(errorMessage)
Validator.validateLinesFormRightAngles([value.axis1, value.axis2],
"Axis are not perpendicular")
def validateLinesFormRightAngles(lines, errorMessage):
for i in range(len(lines)):
m1 = lines[i].computeSlope()
m2 = lines[(i+1)%len(lines)].computeSlope()
if isInfinite(m1) or m1 == 0 or \
isInfinite(m2) or m2 == 0:
if isInfinite(m1) and m2 == 0 or \
isInfinite(m2) and m1 == 0:
pass
else:
raise ShapeException(errorMessage)
else:
if round(m1, 2) != round(-1/m2, 2):
raise ShapeException(errorMessage)
def validateComposite(value, errorMessage):
if not isinstance(value, Composite):
raise ShapeException(errorMessage)
value.center.validate()
for shape in value.shapes:
shape.validate()
def validateLinesAreSameLength(lines, errorMessage):
last_length = lines[0].computeLength()
for line in lines:
length = line.computeLength()
if length != last_length:
raise ShapeException(errorMessage)
last_length = length
def validateDouble(value, errorMessage):
"""
Method that validates that value is a double
:raises: ShapeException: If value is not a valid double
"""
if not isinstance(value, numbers.Real) or isInfinite(value):
raise ShapeException(errorMessage)
def validateEllipse(value, errorMessage):
from shapes.ellipse import Ellipse
if not isinstance(value, Ellipse):
raise ShapeException(errorMessage)
Validator.validatePoint(value.center, "Center is not a valid point.")
Validator.validatePoint(value.focus1, "Focus1 is not a valid point.")
Validator.validatePoint(value.focus2, "Focus2 is not a valid point.")
Validator.validateLine(value.axis1, "Axis1 is not a valid line")
Validator.validateLine(value.axis2, "Axis2 is not a valid line")
if value.computeArea() <= 0:
raise ShapeException(errorMessage)
Validator.__validateLinesFormRightAngles([value.axis1, value.axis2],
"Axis are not perpendicular")
Validator.__validateFociAreAligned(value, "Foci are not aligned")
def build(type, *args, **kwargs):
try:
shape_class = SHAPE_FACTORY_MAP[type]
except KeyError:
raise ShapeException(
'Error: Invalid type for shape factory construction')
return shape_class(*args, **kwargs)
def loadShape(self, string=None, file=None):
if string is None and file is None:
raise ShapeException(
"Expected either a string or file for loadShape")
if file:
with open(file, "r") as myfile:
string = myfile.readlines()
return self._parse(string)
def validateSlopesAreDifferent(lines, errorMessage):
for line in lines:
lineSlope = line.computeSlope()
count = 0
for other_line in lines:
if lineSlope == other_line.computeSlope():
count += 1
if count != 1:
raise ShapeException(errorMessage)
def __init__(self, *args, **kwargs):
points = list(args)
if len(points) < 1:
raise ShapeException(
'No points provided during shape construction')
self.center = points.pop(0)
self.points = points
self.lines = []
Shape.validateShape(value=self, errorMessage="Invalid Shape")
def validatePositiveDouble(value, errorMessage):
"""
Method that validates that value is a positive double
:raises: ShapeException: If Values is not a valid positive double
"""
Validator.validateDouble(value, errorMessage)
if value < 0:
raise ShapeException(errorMessage)
def _findEnd(self, list, index):
begin_count = 1
for i in range(index, len(list)):
if list[i] == 'begin':
begin_count += 1
elif list[i] == 'end':
begin_count -= 1
if begin_count == 0: return i
raise ShapeException(
'No matching end found for list<{}> index<{}>'.format(list, index))
def validateShape(value, errorMessage):
if not isinstance(value, Shape):
raise ShapeException(errorMessage)
Point.validatePoint(
value.center,
"Center <{}> is not a valid point.".format(value.center))
for point in value.points:
Point.validatePoint(
point, "Point <{}> is not a valid point.".format(point))
def validatePoint(value, errorMessage):
"""
Method that validates that value is a valid point
:raises: ShapeException: If value is not a valid point
"""
if not isinstance(value, Point):
raise ShapeException(errorMessage)
Validator.validateDouble(value.x, "Invalid x-location")
Validator.validateDouble(value.y, "Invalid y-location")
def validateLine(value, errorMessage):
"""
Method that validates that a line is valid.
:raises: ShapeException: If the line is invalid
"""
if not isinstance(value, Line):
raise ShapeException(errorMessage)
Point.validatePoint(value.point1, "Invalid point1")
Point.validatePoint(value.point2, "Invalid point2")
Validator.validateLineHasLength(
value, "A Line must have a length greater than 0")
def validateRectangle(value, errorMessage):
if not isinstance(value, Rectangle):
raise ShapeException(errorMessage)
Line.validateLine(value.line1, "Line 1 is not a valid line.")
Line.validateLine(value.line2, "Line 2 is not a valid line.")
Line.validateLine(value.line3, "Line 3 is not a valid line.")
Line.validateLine(value.line4, "Line 4 is not a valid line.")
Validator.validateLinesFormLoop([value.line1, value.line2, value.line3, value.line4], "Lines do not form an enclosed rectangle.")
Validator.validateLinesFormRightAngles([value.line1, value.line2, value.line3, value.line4], "Lines do not form 90 degree angles.")
def validateTriangle(value, errorMessage):
if not isinstance(value, Triangle):
raise ShapeException(errorMessage)
Line.validateLine(value.line1, "Line 1 has is not a valid line.")
Line.validateLine(value.line2, "Line 2 has is not a valid line.")
Line.validateLine(value.line3, "Line 3 has is not a valid line.")
Validator.validateSlopesAreDifferent(
[value.line1, value.line2, value.line3],
"Angles of lines form an invalid triangle")
Validator.validateLinesFormLoop(
[value.line1, value.line2, value.line3],
"Lines do not form an enclosed triangle")
def __validateFociAreAligned(ellipse, errorMessage):
try:
m1 = (ellipse.focus1.y - ellipse.center.y) / (ellipse.focus1.x -
ellipse.center.x)
except ZeroDivisionError:
if (ellipse.center.y - ellipse.focus1.y) > 0:
m1 = float('inf')
else:
m1 = float('-inf')
try:
m2 = (ellipse.focus2.y - ellipse.center.y) / (ellipse.focus2.x -
ellipse.center.x)
except ZeroDivisionError:
if (ellipse.center.y - ellipse.focus2.y) > 0:
m2 = float('-inf')
else:
m2 = float('inf')
if m1 != ellipse.axis1.computeSlope() or \
m2 != ellipse.axis2.computeSlope():
raise ShapeException(errorMessage)
def validateCircle(value, errorMessage):
Ellipse.validateEllipse(value, errorMessage)
if value.axis1.computeLength() != value.axis2.computeLength():
raise ShapeException(errorMessage)
def __init__(self, *args, **kwargs):
try:
self.__constructWithCoords(args[0], args[1])
except IndexError:
raise ShapeException("Invalid arguments for point construction")
def getShape(self, index):
try:
return self.shapes[index]
except IndexError:
raise ShapeException(
'Index out of bounds for getShape({})'.format(index))
def removeShape(self, index):
try:
return self.shapes.pop(index)
except IndexError:
raise ShapeException(
'Index out of bounds for removeShape({})'.format(index))
def validateLinesFormLoop(lines, errorMessage):
for i in range(len(lines)):
if lines[i].point2 != lines[(i + 1) % len(lines)].point1:
raise ShapeException(errorMessage)
def validateLineHasLength(value, errorMessage):
if value.computeLength() <= 0:
raise ShapeException(errorMessage)
