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Direction.ts
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Direction.ts
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import { Position } from "../GridEngine.js";
import { Vector2 } from "../Utils/Vector2/Vector2.js";
export enum Direction {
NONE = "none",
LEFT = "left",
UP_LEFT = "up-left",
UP = "up",
UP_RIGHT = "up-right",
RIGHT = "right",
DOWN_RIGHT = "down-right",
DOWN = "down",
DOWN_LEFT = "down-left",
}
const oppositeDirections = {
[Direction.UP]: Direction.DOWN,
[Direction.DOWN]: Direction.UP,
[Direction.LEFT]: Direction.RIGHT,
[Direction.RIGHT]: Direction.LEFT,
[Direction.NONE]: Direction.NONE,
[Direction.UP_LEFT]: Direction.DOWN_RIGHT,
[Direction.UP_RIGHT]: Direction.DOWN_LEFT,
[Direction.DOWN_RIGHT]: Direction.UP_LEFT,
[Direction.DOWN_LEFT]: Direction.UP_RIGHT,
};
const directionVectors = {
[Direction.UP]: Vector2.UP,
[Direction.DOWN]: Vector2.DOWN,
[Direction.LEFT]: Vector2.LEFT,
[Direction.RIGHT]: Vector2.RIGHT,
[Direction.NONE]: Vector2.ZERO,
[Direction.UP_LEFT]: Vector2.UP_LEFT,
[Direction.UP_RIGHT]: Vector2.UP_RIGHT,
[Direction.DOWN_RIGHT]: Vector2.DOWN_RIGHT,
[Direction.DOWN_LEFT]: Vector2.DOWN_LEFT,
};
export const dirToNumber = {
[Direction.UP]: 0,
[Direction.UP_RIGHT]: 1,
[Direction.RIGHT]: 2,
[Direction.DOWN_RIGHT]: 3,
[Direction.DOWN]: 4,
[Direction.DOWN_LEFT]: 5,
[Direction.LEFT]: 6,
[Direction.UP_LEFT]: 7,
[Direction.NONE]: NaN,
};
export const numberToDir = [
Direction.UP,
Direction.UP_RIGHT,
Direction.RIGHT,
Direction.DOWN_RIGHT,
Direction.DOWN,
Direction.DOWN_LEFT,
Direction.LEFT,
Direction.UP_LEFT,
];
const diagonals = [
Direction.DOWN_LEFT,
Direction.DOWN_RIGHT,
Direction.UP_RIGHT,
Direction.UP_LEFT,
];
export function directions(): Direction[] {
return [
Direction.UP,
Direction.DOWN,
Direction.LEFT,
Direction.RIGHT,
Direction.NONE,
Direction.UP_LEFT,
Direction.UP_RIGHT,
Direction.DOWN_RIGHT,
Direction.DOWN_LEFT,
];
}
export function isDiagonal(direction: Direction): boolean {
return diagonals.includes(direction);
}
export function isHorizontal(direction: Direction): boolean {
const horizontals = [Direction.LEFT, Direction.RIGHT];
return horizontals.includes(direction);
}
export function isVertical(direction: Direction): boolean {
const verticals = [Direction.UP, Direction.DOWN];
return verticals.includes(direction);
}
export function turnCounterClockwise(
direction: Direction,
times = 1,
): Direction {
if (direction === Direction.NONE) {
return Direction.NONE;
}
return numberToDir[(dirToNumber[direction] + 8 - (Math.abs(times) % 8)) % 8];
}
export function turnClockwise(direction: Direction, times = 1): Direction {
if (direction === Direction.NONE) {
return Direction.NONE;
}
return numberToDir[(dirToNumber[direction] + times) % 8];
}
export function directionVector(direction: Direction): Vector2 {
return directionVectors[direction];
}
export function oppositeDirection(direction: Direction): Direction {
return oppositeDirections[direction];
}
/**
* Helper function that returns the direction from a source to a target
* position.
*
* For example:
* `directionFromPos({x:1, y:1}, {{x:2, y:1}}) = Direction.RIGHT`
*
* @category Helpers
*/
export function directionFromPos(src: Position, dest: Position): Direction {
if (src.x === dest.x) {
if (src.y > dest.y) return Direction.UP;
if (src.y < dest.y) return Direction.DOWN;
} else if (src.y === dest.y) {
if (src.x > dest.x) return Direction.LEFT;
if (src.x < dest.x) return Direction.RIGHT;
} else if (src.x > dest.x) {
if (src.y < dest.y) return Direction.DOWN_LEFT;
if (src.y > dest.y) return Direction.UP_LEFT;
} else if (src.x < dest.x) {
if (src.y < dest.y) return Direction.DOWN_RIGHT;
if (src.y > dest.y) return Direction.UP_RIGHT;
}
return Direction.NONE;
}
export enum NumberOfDirections {
FOUR = 4,
EIGHT = 8,
}
export function isDirection(val: any): val is Direction {
return typeof val === "string" && directions().includes(val as Direction);
}