203 lines
4.5 KiB
Python
203 lines
4.5 KiB
Python
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from .RAIILock import RAIILock
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import math
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import os
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import threading
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import time
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class TextCanvas:
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__DEFAULT_TERMINAL_WIDTH = 80
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__DEFAULT_TERMINAL_HEIGHT = 22
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__TERMINAL_UPDATE_INTERVAL = 1
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__DRAW_RESOLUTION = 3
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def __init__(self):
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self.__terminal_width = self.__DEFAULT_TERMINAL_WIDTH
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self.__terminal_height = self.__DEFAULT_TERMINAL_HEIGHT
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self.__last_terminal_dimensions_update = time.time()
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self._update_terminal_dimensions(force=True)
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self.__grid = []
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self.__render_string = ""
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self.__is_dirty = True
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self.__last_render_time = time.time()
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self.__lock = threading.RLock()
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def _update_render_if_dirty(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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if self.__is_dirty:
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self._update_render(acquire_locks=False)
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def _update_render(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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self.clear(acquire_locks=acquire_locks)
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self._update_render_string(acquire_locks=acquire_locks)
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self.__last_render_time = time.time()
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self.__is_dirty = False
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def _update_render_string(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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s = ""
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for line in self.__grid:
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for c in line:
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s += c
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s += "\n"
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# Don't need that last line feed
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s = s[:-1]
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self.__grid_string = s
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def get(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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self._update_render_if_dirty(acquire_locks=acquire_locks)
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return self.__grid_string
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def print(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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s = self.get(acquire_locks=acquire_locks)
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print(s)
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def draw_text(self, x, y, text, center=False, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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if not isinstance(text, str):
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text = str(text)
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if len(text) == 0:
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return
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if center is True:
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x -= len(text) / 2
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x = int(x)
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for c in text:
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self.write(x=x, y=y, character=c, acquire_locks=acquire_locks)
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x += 1
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def draw_line(self, start_x, start_y, end_x, end_y, character="*", acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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distance_x = math.fabs(end_x - start_x)
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distance_y = math.fabs(end_y - start_y)
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if distance_x > distance_y:
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distance = distance_x
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else:
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distance = distance_y
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direction_x = 1 if end_x > start_x else -1
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direction_y = 1 if end_y > start_y else -1
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steps = round(distance * self.__DRAW_RESOLUTION)
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if steps == 0:
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return
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increment_x = distance_x / steps
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increment_x *= direction_x
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increment_y = distance_y / steps
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increment_y *= direction_y
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pos_x = start_x
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pos_y = start_y
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for i in range(steps):
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pos_x_rounded = round(pos_x)
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pos_y_rounded = round(pos_y)
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self.write(x=pos_x_rounded, y=pos_y_rounded, character=character, acquire_locks=acquire_locks)
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pos_x += increment_x
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pos_y += increment_y
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def write(self, x, y, character, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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x = round(x)
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y = round(y)
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if 0 <= y < len(self.__grid):
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if 0 <= x < len(self.__grid[y]):
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self.__grid[y][x] = character
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self.__is_dirty = True
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def clear(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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self._update_terminal_dimensions(acquire_locks=acquire_locks)
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self.__grid = []
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for y in range(self.__terminal_height):
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self.__grid.append([])
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for x in range(self.__terminal_width):
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self.__grid[y].append(" ")
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self.__is_dirty = True
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def get_dimensions(self, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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height = len(self.__grid)
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if height == 0:
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width = 0
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else:
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width = len(self.__grid[0])
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return width, height
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def _update_terminal_dimensions(self, force=False, acquire_locks=True):
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with RAIILock(self.__lock, defer=not acquire_locks):
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now = time.time()
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if force is not False and now - self.__last_terminal_dimensions_update < self.__TERMINAL_UPDATE_INTERVAL:
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return
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self.__last_terminal_dimensions_update = now
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width, height = self.determine_terminal_dimensions()
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self.__terminal_width = width
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self.__terminal_height = height
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@staticmethod
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def determine_terminal_dimensions():
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columns, lines = os.get_terminal_size()
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return columns, lines
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