First implementation of visibility, not tested, nor used for now
This commit is contained in:
Nicolas Margulies
parent
53cb6a89ae
commit
1cf5e7bd8b
1
.gitignore
vendored
1
.gitignore
vendored
@ -3,6 +3,7 @@
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env/
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venv/
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local/
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.coverage
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.pytest_cache/
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@ -4,7 +4,7 @@
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from enum import Enum, auto
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from math import sqrt
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from random import choice, randint
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from typing import List, Optional
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from typing import List, Optional, Union, Tuple
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from .display.texturepack import TexturePack
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from .translations import gettext as _
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@ -30,6 +30,28 @@ class Logs:
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self.messages = []
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class Slope():
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X: int
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Y: int
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def __init__(self, y: int, x: int) -> None:
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self.Y = y
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self.X = x
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def compare(self, other: Union[Tuple[int, int], "Slope"]) -> int:
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if isinstance(other, Slope):
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y, x = other.Y, other.X
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else:
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y, x = other
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return self.Y * x - self.X * y
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def __lt__(self, other: Union[Tuple[int, int], "Slope"]) -> bool:
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return self.compare(other) < 0
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def __eq__(self, other: Union[Tuple[int, int], "Slope"]) -> bool:
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return self.compare(other) == 0
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class Map:
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"""
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Object that represents a Map with its width, height
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@ -40,6 +62,7 @@ class Map:
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start_y: int
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start_x: int
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tiles: List[List["Tile"]]
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visibility: List[List[bool]]
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entities: List["Entity"]
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logs: Logs
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# coordinates of the point that should be
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@ -54,6 +77,8 @@ class Map:
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self.start_y = start_y
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self.start_x = start_x
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self.tiles = tiles
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self.visibility = [[False for _ in range(len(tiles[0]))]
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for _ in range(len(tiles))]
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self.entities = []
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self.logs = Logs()
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@ -129,7 +154,7 @@ class Map:
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"""
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Put randomly {count} hedgehogs on the map, where it is available.
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"""
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for ignored in range(count):
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for _ignored in range(count):
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y, x = 0, 0
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while True:
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y, x = randint(0, self.height - 1), randint(0, self.width - 1)
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@ -140,6 +165,125 @@ class Map:
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entity.move(y, x)
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self.add_entity(entity)
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def compute_visibility(self, y: int, x: int, max_range: int) -> None:
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"""
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Sets the visible tiles to be the ones visible by an entity at point
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(y, x), using a twaked shadow casting algorithm
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"""
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for line in self.visibility:
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for i in range(len(line)):
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line[i] = False
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self.visibility[y][x] = True
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for octant in range(8):
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self.compute_visibility_octant(octant, (y, x), max_range, 1,
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Slope(1, 1), Slope(0, 1))
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def crop_top_visibility(self, octant: int, origin: Tuple[int, int],
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x: int, top: Slope) -> int:
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if top.X == 1:
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top_y = x
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else:
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top_y = ((x * 2 - 1) * top.Y + top.X) / (top.X * 2)
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if self.is_wall(top_y, x, octant, origin):
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if top >= (top_y * 2 + 1, x * 2) and not\
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self.is_wall(top_y + 1, x, octant, origin):
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top_y += 1
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else:
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ax = x * 2
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if self.is_wall(top_y + 1, x + 1, octant, origin):
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ax += 1
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if top > (top_y * 2 + 1, ax):
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top_y += 1
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return top_y
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def crop_bottom_visibility(self, octant: int, origin: Tuple[int, int],
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x: int, bottom: Slope) -> int:
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if bottom.Y == 0:
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bottom_y = 0
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else:
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bottom_y = ((x * 2 + 1) * bottom.Y + bottom.X) /\
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(bottom.X * 2)
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if bottom >= (bottom_y * 2 + 1, x * 2) and\
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self.is_wall(bottom_y, x, octant, origin) and\
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not self.is_wall(bottom_y + 1, x, octant, origin):
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bottom_y += 1
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return bottom_y
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def compute_visibility_octant(self, octant: int, origin: Tuple[int, int],
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max_range: int, distance: int, top: Slope,
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bottom: Slope) -> None:
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for x in range(distance, max_range):
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top_y = self.crop_top_visibility(octant, origin, x, top)
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bottom_y = self.crop_bottom_visibility(octant, origin, x, bottom)
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was_opaque = -1
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for y in range(top_y, bottom_y - 1, -1):
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if sqrt(x**2 + y**2) > max_range:
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continue
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is_opaque = self.is_wall(y, x, octant, origin)
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is_visible = is_opaque\
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or ((y != top_y or top > (y * 4 - 1, x * 4 - 1))
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and (y != bottom_y or bottom < (y * 4 + 1, x * 4 + 1)))
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if is_visible:
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self.set_visible(y, x, octant, origin)
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if x == max_range:
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continue
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if is_opaque and was_opaque == 0:
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nx, ny = x * 2, y * 2 + 1
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if self.is_wall(y + 1, x, octant, origin):
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nx -= 1
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if top > (ny, nx):
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if y == bottom_y:
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bottom = Slope(ny, nx)
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break
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else:
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self.compute_visibility_octant(
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octant, origin, max_range, x + 1, top,
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Slope(ny, nx))
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else:
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if y == bottom_y:
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return
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elif not is_opaque and was_opaque == 1:
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nx, ny = x * 2, y * 2 + 1
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if self.is_wall(y + 1, x + 1, octant, origin):
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nx += 1
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if bottom >= (ny, nx):
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return
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was_opaque = is_opaque
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if was_opaque != 0:
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break
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@staticmethod
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def translate_coord(y: int, x: int, octant: int,
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origin: Tuple[int, int]) -> Tuple[int, int]:
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ny, nx = origin
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if octant == 0:
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return nx + x, ny - y
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elif octant == 1:
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return nx + y, ny - x
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elif octant == 2:
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return nx - y, ny - x
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elif octant == 3:
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return nx - x, ny - y
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elif octant == 4:
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return nx - x, ny + y
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elif octant == 5:
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return nx - y, ny + x
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elif octant == 6:
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return nx + y, ny + x
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elif octant == 7:
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return nx + x, ny + y
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def is_wall(self, y: int, x: int, octant: int,
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origin: Tuple[int, int]) -> bool:
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y, x = self.translate_coord(y, x, octant, origin)
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return self.tiles[y][x].is_wall()
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def set_visible(self, y: int, x: int, octant: int,
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origin: Tuple[int, int]) -> None:
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y, x = self.translate_coord(y, x, octant, origin)
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self.visibility[y][x] = True
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def tick(self) -> None:
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"""
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Trigger all entity events.
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