Pascal Lais
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181 lines
7.3 KiB
Python
181 lines
7.3 KiB
Python
#!/usr/bin/python3
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"""The sweep module defines a base class sweep for various sweep algorithms. It also contains a
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child-class for each individual algorithm."""
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import copy
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import linesegment
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import point
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class Algorithm():
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"The Algorithm class is the base class for each individual algorithm"
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def __init__(self):
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self._input = None # The input values
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self._result = {} # The result of the sweep
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self._ready = False # If the algorithm is ready to be executed
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self._running = False # If the algorithm is currently running
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self._section = "start" # A string that names the current section of the algorithm
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self._num_steps = {} # The number of steps that were needed to solve the problem
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def start(self):
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"""Start the performing the algorithm. Return True if it was successful"""
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if not self._ready:
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print("Error: Sweep is not yet ready to be performed")
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return False
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self._running = True
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return True
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def step(self):
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"""Perform a single step of the algorithm."""
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if self._section:
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if self._section in self._num_steps:
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self._num_steps[self._section] += 1
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else:
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self._num_steps[self._section] = 1
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def run(self):
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"""Execute the sweep. Returns the result dict."""
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if not self.start():
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return False
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while self._running:
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self.step()
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return self._result
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def is_running(self):
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"""Return if the algorithm is running."""
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return self._running
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def get_result(self):
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"""Return the result of the algorithm."""
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return self._result
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def draw(self, canvas, width, height, max_x, max_y):
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"""Dummy for draw method"""
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class NearestNeighborsSweep(Algorithm):
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"""Calculate the pair of points inside a set, that have the minimal distance between each
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other inside this set"""
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def __init__(self, point_set=None):
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super().__init__()
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if isinstance(point_set, list):
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for pnt in point_set:
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if not isinstance(pnt, point.Point):
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raise Exception(self, "Inputs have to be of type point.Point!")
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self._input = copy.deepcopy(point_set)
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self._ready = True
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elif point_set is not None:
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raise Exception(self, "Wrong input type for point_set")
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self._sss = {} # The sweep state structure
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self._es = [] # The event queue
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self._result = {"success": False, \
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"distance": None, \
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"points": [None, None]}
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def start(self):
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"""Start the performing the algorithm. Return True if it was successful"""
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if not super().start():
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return False
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self._result["success"] = False
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self._sss = {"mindist": None, \
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"points": []}
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# Populate event structure
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self._es = copy.deepcopy(self._input)
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# Sort the input elements
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self._num_steps["sort"] = point.sort_set(self._es)
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return True
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def step(self):
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"""Perform a single step of the algorithm."""
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if not self._running:
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return
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self._section = "sweep"
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event = self._es.pop(0)
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if self._sss["mindist"] is not None:
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while len(self._sss["points"]) > 0 and \
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self._sss["points"][0].get_x() <= (event.get_x() - self._sss["mindist"]):
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del self._sss["points"][0]
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for pnt in self._sss["points"]:
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if self._sss["mindist"] is None:
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self._sss["mindist"] = linesegment.LineSegment(pnt, event).get_length()
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elif (event.get_y() - self._sss["mindist"]) < \
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pnt.get_y() < (event.get_y() + self._sss["mindist"]):
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distance = linesegment.LineSegment(pnt, event).get_length()
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if self._sss["mindist"] > distance > 0:
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self._sss["mindist"] = distance
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self._result["points"][0] = pnt
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self._result["points"][1] = event
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super().step()
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self._sss["points"].append(event)
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if len(self._es) == 0:
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self._result["success"] = True
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self._result["distance"] = self._sss["mindist"]
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self._running = False
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def get_result_string(self, print_result=False):
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"""Pack the result into a string."""
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result_string = ""
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if self._running:
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result_string = "Sweep is still running."
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elif not self._result["success"]:
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result_string = "Sweep was not successful."
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else:
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result_string = "Sweep successfully completed\n"
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result_string += " Summary:\n"
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result_string += " Number of Inputs:" + str(len(self._input)) + "\n"
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result_string += " Inputs: ["
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for i, pnt in enumerate(self._input):
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if i:
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result_string += ","
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result_string += str(pnt)
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result_string += "]\n"
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result_string += " Nearest Neighbors: "
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result_string += str(linesegment.LineSegment(self._result["points"][0], \
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self._result["points"][1]))
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result_string += "\n"
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result_string += " Distance: " + str(self._result["distance"]) + "\n"
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result_string += " Number of steps:\n"
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result_string += " Sort:" + str(self._num_steps["sort"]) +"\n"
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result_string += " Sweep:" + str(self._num_steps["sweep"]) +"\n"
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if print_result:
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print(result_string)
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return result_string
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def draw(self, canvas, width, height, max_x, max_y):
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"""Draw the algorithm state on a canvas"""
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canvas.delete("all")
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for pnt in self._input:
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if len(self._es) > 0 and pnt == self._es[0]:
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cur_x, cur_y = self._es[0].draw(canvas, width, height, max_x, max_y, "#0000FF")
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canvas.create_line(cur_x, 0, cur_x, height, fill="#0000FF")
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if self._sss["mindist"]:
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canvas.create_line(cur_x - (self._sss["mindist"] * width / max_x), 0, \
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cur_x - (self._sss["mindist"] * width / max_x), height, fill="#0000FF")
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canvas.create_line(cur_x - (self._sss["mindist"] * width / max_x), \
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cur_y - (self._sss["mindist"] * height / max_y), \
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cur_x, cur_y - (self._sss["mindist"] * height / max_y), fill="#0000FF")
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canvas.create_line(cur_x - (self._sss["mindist"] * width / max_x), \
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cur_y + (self._sss["mindist"] * height / max_y), \
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cur_x, cur_y + (self._sss["mindist"] * height / max_y), fill="#0000FF")
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else:
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canvas.create_line(0, 0, 0, max_y, fill="#0000FF")
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if pnt in self._result["points"]:
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pnt.draw(canvas, width, height, max_x, max_y, "#FF0000")
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else:
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pnt.draw(canvas, width, height, max_x, max_y)
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if self._result["points"][0]:
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linesegment.LineSegment( \
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self._result["points"][0], self._result["points"][1] \
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).draw(canvas, width, height, max_x, max_y, "#FF0000")
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