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- // @flow
-
- export type coordinates = {
- x: number,
- y: number,
- }
-
- /**
- * Abstract class used to represent a BaseShape.
- * Abstract classes do not exist by default in Javascript: we force it by throwing errors in the constructor
- * and in methods to implement
- */
- export default class BaseShape {
-
- #currentShape: Array<Array<number>>;
- #rotation: number;
- position: coordinates;
-
- /**
- * Prevent instantiation if classname is BaseShape to force class to be abstract
- */
- constructor() {
- if (this.constructor === BaseShape)
- throw new Error("Abstract class can't be instantiated");
- this.#rotation = 0;
- this.position = {x: 0, y: 0};
- this.#currentShape = this.getShapes()[this.#rotation];
- }
-
- /**
- * Gets this shape's color.
- * Must be implemented by child class
- */
- getColor(): string {
- throw new Error("Method 'getColor()' must be implemented");
- }
-
- /**
- * Gets this object's all possible shapes as an array.
- * Must be implemented by child class.
- *
- * Used by tests to read private fields
- */
- getShapes(): Array<Array<Array<number>>> {
- throw new Error("Method 'getShapes()' must be implemented");
- }
-
- /**
- * Gets this object's current shape.
- *
- * Used by tests to read private fields
- */
- getCurrentShape(): Array<Array<number>> {
- return this.#currentShape;
- }
-
- /**
- * Gets this object's coordinates.
- * This will return an array of coordinates representing the positions of the cells used by this object.
- *
- * @param isAbsolute Should we take into account the current position of the object?
- * @return {Array<coordinates>} This object cells coordinates
- */
- getCellsCoordinates(isAbsolute: boolean): Array<coordinates> {
- let coordinates = [];
- for (let row = 0; row < this.#currentShape.length; row++) {
- for (let col = 0; col < this.#currentShape[row].length; col++) {
- if (this.#currentShape[row][col] === 1)
- if (isAbsolute)
- coordinates.push({x: this.position.x + col, y: this.position.y + row});
- else
- coordinates.push({x: col, y: row});
- }
- }
- return coordinates;
- }
-
- /**
- * Rotate this object
- *
- * @param isForward Should we rotate clockwise?
- */
- rotate(isForward: boolean) {
- if (isForward)
- this.#rotation++;
- else
- this.#rotation--;
- if (this.#rotation > 3)
- this.#rotation = 0;
- else if (this.#rotation < 0)
- this.#rotation = 3;
- this.#currentShape = this.getShapes()[this.#rotation];
- }
-
- /**
- * Move this object
- *
- * @param x Position X offset to add
- * @param y Position Y offset to add
- */
- move(x: number, y: number) {
- this.position.x += x;
- this.position.y += y;
- }
-
- }
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