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Add dir with some small projects
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bt3gl
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55 changed files with 12 additions and 1212 deletions
304
small-projects/magic-pen/src/Epen.py
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304
small-projects/magic-pen/src/Epen.py
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# -*- coding: utf8 -*-
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import sys
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import logging as l
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import src.encoder as enc
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from src.utils import get_boundary_limits
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class EPen(object):
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def __init__(self):
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self.boundary = enc.get_boundary_limits('enc')
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self.color = None
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self.pen_location = None
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self.is_pen_down = None
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def _parse_clear(self):
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"""
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Runs clear operations and prints CLEAR STDOUT.
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"""
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self.pen_location = [0, 0]
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self.color = [0, 0, 0, 255]
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self.is_pen_down = False
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print('CLR;')
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def _parse_pen_state(self, substr):
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"""
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Sets pen to be UP or DOWN and prints PEN STATE STDOUT.
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Arguments:
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substr {str} -- parameters for this opcode, which is
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either 0 (for pen up) or any other (for pen down)
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"""
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if substr:
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pen_state = enc.run_decoder(substr)
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else:
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l.error('Could not parse pen state string {}'.format(substr))
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if pen_state == 0:
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if self.is_pen_down:
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self.is_pen_down = False
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print('PEN UP;')
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else:
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if not self.is_pen_down:
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self.is_pen_down = True
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print('PEN DOWN;')
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def _parse_color(self, substr):
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"""
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Sets pen color and prints COLOR SET STDOUT.
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Arguments:
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substr {str} -- RGBA parameters for this opcode,
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which is represented by four integers in the range
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[0, 255] defining colors (red, green, blue) and alpha.
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"""
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red = enc.run_decoder(substr[:4])
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green = enc.run_decoder(substr[4:8])
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blue = enc.run_decoder(substr[8:12])
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alpha = enc.run_decoder(substr[12:16])
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self.color = [red, green, blue, alpha]
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print('CO {0} {1} {2} {3};'.format(*self.color))
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def _parse_pen_move(self, substr):
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"""
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Parses a substring of parameters and usex this data
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as pair of coordinates to move the pen inside the
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square boundary limit.
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Arguments:
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substr {str} -- (x,y) pairs with directions to where
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the pen should move to (at least one pair).
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Returns:
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i - an integer indicating how much of the input
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substring was used in this opcode.
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"""
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i = 0
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move_list = []
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while i < len(substr):
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try:
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# Ends if find another opcode.
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if substr[i:i+2] in set(['F0', '80', 'A0']):
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break
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if len(substr[i:]) > 8:
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x_coords = enc.run_decoder(substr[i:i+4])
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y_coords = enc.run_decoder(substr[i+4:i+8])
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move_list.append([x_coords, y_coords])
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i += 8
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else:
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break
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except (KeyError, ValueError) as e:
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l.error('Ill-formated MV data: {}'.format(e))
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self._move_pen(move_list)
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return i
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def _print_mv(self, cmd_list=None):
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"""
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Prints MV PEN STDOUT. If a string with a list of commands
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is given, print that instead of pen_location.
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Arguments:
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cmd_list {list (optional)} -- a list with pairs of
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(x, y) coordinates.
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"""
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if cmd_list:
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cmd_str = ' '.join(cmd_list)
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print('MV {};'.format(cmd_str))
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else:
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print('MV ({0}, {1});'.format(self.pen_location[0], self.pen_location[1]))
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def _fix_boundary(self, coord):
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"""
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Check if the coordinate exceeds
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the boundary limit, returning this
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value in that case.
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Arguments:
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coord {int} -- x or y coordinate.
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Returns:
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An integer representing the fixed coordinate.
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"""
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if coord < self.boundary[0]:
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return self.boundary[0]
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elif coord > self.boundary[1]:
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return self.boundary[1]
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else:
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return coord
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def _fix_boundaries(self, x, y):
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"""
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Checks if a set of (x, y) coordinates
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exceeds the boundary limits, returning
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a fixed (x, y) pair.
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Arguments:
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coord {list} -- (x, y) coordinates.
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Returns:
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A (x, y) pair representing the fixed coordinates.
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"""
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return self._fix_boundary(x), self._fix_boundary(y)
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def _is_inside_boundary(self, xymove=None):
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"""
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Checks whether a set of coordinate is inside
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of the boundary, returning True if the case,
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or False otherwise.
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Arguments:
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xymove {tuple} - (x, y) tuple.
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Returns:
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True if the coordinates were fixed, False
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otherwise.
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"""
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if xymove is None:
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xymove = self.pen_location
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x_fix = self._fix_boundary(xymove[0])
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y_fix = self._fix_boundary(xymove[1])
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return (xymove[0] == x_fix and xymove[1] == y_fix)
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def _is_on_the_boundary(self, xymove=None):
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"""
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Checks whether a coordinate is on the boundary,
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returning True if the case, or False otherwise.
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Arguments:
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xymove {tuple} - (x, y) tuple.
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Returns:
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True if any of the (x, y) coordinates are
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on the boundary, False otherwise.
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"""
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if xymove is None:
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x, y = self.pen_location
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return x == self.boundary[0] or x == self.boundary[1] or \
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y == self.boundary[0] or y == self.boundary[1]
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def _get_next_position(self, xymove):
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"""
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Givens a move coordinates (x, y), returns the next
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destination coordinate for the pen.
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Arguments:
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xymove {tuple} - (x, y) tuple.
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Returns:
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The next (x, y) coordinates to move the pen to.
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"""
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return self.pen_location[0] + xymove[0], \
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self.pen_location[1] + xymove[1]
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def _move_pen(self, move_list):
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"""
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Changes the location of the pen relative to its current location.
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Arguments:
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move_list {list} -- list of coordinates to move the pen.
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"""
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# Loop over the list of (x ,y) moves, adding them to
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# a dictionary, together with a boolean False if x or y
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# is outside the limits.
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tablet_dict = {}
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for n, xymove in enumerate(move_list, 1):
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self.pen_location = self._get_next_position(xymove)
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if self._is_inside_boundary():
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tablet_dict[n] = [self.pen_location, True]
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else:
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tablet_dict[n] = [self.pen_location, False]
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# Find the positions and print it as pen down.
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if self.is_pen_down:
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cmd_list = []
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for i in sorted(tablet_dict):
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x = tablet_dict[i][0][0]
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y = tablet_dict[i][0][1]
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is_inside = tablet_dict[i][1]
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if is_inside:
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cmd_list.append('({0}, {1})'.format(x, y))
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else:
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break
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if cmd_list:
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self._print_mv(cmd_list)
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# It broke the boundary at some point.
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if i < len(tablet_dict):
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for item in range(i, len(tablet_dict)+1):
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coords, is_inside = tablet_dict[item]
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self.pen_location = self._fix_boundaries(coords[0], coords[1])
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self._print_mv()
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if item != len(tablet_dict):
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if not is_inside:
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if self.is_pen_down:
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self._parse_pen_state('4000')
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else:
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self._parse_pen_state('4001')
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else:
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coords, is_inside = tablet_dict[i]
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self.pen_location = self._fix_boundaries(coords[0], coords[1])
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if not is_inside:
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self._parse_pen_state('4000')
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# Pen is up.
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else:
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last_position = tablet_dict[sorted(tablet_dict)[-1]][0]
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self.pen_location = self._fix_boundaries(*last_position)
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self._print_mv()
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def parse_stream(self, stream_str):
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"""
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Parses a stream string and run its commands and their
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adjacent parameters.
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Arguments:
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stream_str {str} - data stream of actions be taken.
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"""
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i = 0
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while i < len(stream_str):
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# Opcode is CLEAR.
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if stream_str[i:i+2] == 'F0':
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l.debug('Parsing clear opcode...')
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self._parse_clear()
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i += 2
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# Opcode is SET PEN STATE.
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elif stream_str[i:i+2] == '80':
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l.debug('Parsing pen state opcode...')
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self._parse_pen_state(stream_str[i+2:i+6])
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i += 6
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# Opcode is SET COLOR.
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elif stream_str[i:i+2] == 'A0':
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l.debug('Parsing color opcode...')
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self._parse_color(stream_str[i+2:i+18])
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i += 18
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# Opcode is MOVE PEN.
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elif stream_str[i:i+2] == 'C0':
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l.debug('Parsing pen move opcode...')
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i += 2 + self._parse_pen_move(stream_str[i+2:])
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# Opcode is not identified.
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else:
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l.debug('Non-identificated char: {}'.format(stream_str[i]))
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i += 1
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