core2d/src/plugin/JumperSprite.mjs

Multiplatform 2D interaction engine

"use strict";

import { Command } from "../Command.mjs";
import { Core2D } from "../Core2D.mjs";
import { Sprite } from "../Sprite.mjs";

const PUSHABLE_TAG = "pushable";

export class JumperSprite extends Sprite {
  constructor(scene) {
    super(scene);
    this.accelerationY = 0.5;
    this.canGoLeft = true;
    this.canGoRight = true;
    this.canJump = false;
    this.controller = Core2D.getController();
    this.jumpCommand = Command.A;
    this.jumpSpeed = -8;
    this.solid = true;
    this.step = 2;
  }

  setJumpCommand(jumpCommand) {
    this.jumpCommand = jumpCommand;
    return this;
  }

  setJumpSpeed(jumpSpeed) {
    this.jumpSpeed = jumpSpeed;
    return this;
  }

  setStep(step) {
    this.step = step;
    return this;
  }

  jump() {
    this.canJump = false;
    this.setSpeedY(this.jumpSpeed);
    this.onJump();
  }

  onCollision(sprite) {
    const collision = this.getCollision(sprite);

    if (collision.bottom) {
      if (this.speedY > 0) {
        this.setSpeedY(0);
        this.setBottom(sprite.top - 1);
        this.canJump = true;
      }

      this.onBottomCollision(sprite);
    } else if (collision.top) {
      if (this.speedY < 0) {
        this.setSpeedY(0);
        this.setTop(sprite.bottom + 1);
      }

      this.onTopCollision(sprite);
    } else if (collision.left) {
      if (!sprite.hasTag(PUSHABLE_TAG)) {
        this.canGoLeft = false;
      }

      this.setLeft(sprite.right + 1);
      this.onLeftCollision(sprite);
    } else if (collision.right) {
      if (!sprite.hasTag(PUSHABLE_TAG)) {
        this.canGoRight = false;
      }

      this.setRight(sprite.left - 1);
      this.onRightCollision(sprite);
    }
  }

  sync() {
    if (this.solid) {
      if (this.canJump && this.controller.keyPush(this.jumpCommand)) {
        this.jump();
      }

      if (this.canGoLeft && this.controller.keyDown(Command.LEFT)) {
        this.x -= this.step;
        this.canGoRight = true;
        this.onLeft();
      } else if (this.canGoRight && this.controller.keyDown(Command.RIGHT)) {
        this.x += this.step;
        this.canGoLeft = true;
        this.onRight();
      } else {
        this.onIdle();
      }

      if (!this.collided) {
        this.canGoLeft = true;
        this.canGoRight = true;
        this.canJump = false;
      }
    }

    return Sprite.prototype.sync.call(this);
  }

  onJump() {
    // no default behavior
  }

  onIdle() {
    // no default behavior
  }

  onLeft() {
    // no default behavior
  }

  onRight() {
    // no default behavior
  }

  onLeftCollision(sprite) {
    // no default behavior
    return sprite;
  }

  onRightCollision(sprite) {
    // no default behavior
    return sprite;
  }

  onTopCollision(sprite) {
    // no default behavior
    return sprite;
  }

  onBottomCollision(sprite) {
    // no default behavior
    return sprite;
  }
}