mr-crocs-adventures/js/module.js

'use strict';

import Key from "./Key.js";
import MrCroc from "./MrCroc.js";
import RetroArchitecture from "./retro/RetroArchitecture.js";
import FileLoader from "./FileLoader.js";
import Camera from "./Camera.js";
import Gisela from "./Gisela.js";
import Setting from "./Setting.js";
import FrameRateMeasurer from "./FrameRateMeasurer.js";
import GraphicSet from "./GraphicSet.js";

class ImageLoader
{
    images = [];
    numberImagesLoaded = 0;

    update()
    {
        this.numberImagesLoaded++;

        if (this.numberImagesLoaded === this.images.length) {
            window.dispatchEvent(new Event('imagesloaded'));
        }
    }

    getCurrentProgress()
    {
        return this.numberImagesLoaded / this.images.length;
    }

    addImage(imagePath)
    {
        let image = new Image();
        image.src = imagePath;
        image.addEventListener(
            'load', () => {
                this.update();
            }
        );

        this.images.push(image);
    }
}

function MainLoop(timestamp)
{
    if (lastRendered === undefined && lastTimestamp === undefined) {
        lastRendered = timestamp;
        lastTimestamp = timestamp;
    }

    let delta = (timestamp - lastTimestamp) / (10 / GAME_SPEED);

    let ceilingHeight = Math.max(
        architecture.getCeilingHeight(mrCroc.getPositionHeadLeft()),
        architecture.getCeilingHeight(mrCroc.getPositionHeadRight()),
    );

    let groundHeight = Math.min(
        architecture.getGroundHeight(mrCroc.getPositionFootLeft()),
        architecture.getGroundHeight(mrCroc.getPositionFootRight())
    );

    /* Handle falling */
    mrCroc.position.y += mrCroc.fallSpeed;
    mrCroc.fallSpeed += GRAVITY * delta;

    /* Handle ground collision */
    if (mrCroc.position.y > groundHeight && mrCroc.fallSpeed > 0) {
        mrCroc.position.y = groundHeight;
        mrCroc.fallSpeed = 0;
    }

    /* Handle ceiling collision */
    if (mrCroc.position.y - mrCroc.getHeight() <= ceilingHeight) {
        mrCroc.fallSpeed = 0;
        mrCroc.position.y = ceilingHeight + mrCroc.getHeight() + 1;
    }

    /* Handle jumping */
    if (!mrCroc.isJumping && mrCroc.fallSpeed === 0 && mrCroc.position.y === groundHeight && KeyJump.isPressed()) {
        mrCroc.jump();
    } else if (!KeyJump.isPressed()) {
        mrCroc.isJumping = false;
    }

    /* Movement left and right */
    if (!hasPlayerLeftArchitecture && KeyLeft.isPressed()) {
        let lastWallLeft = Math.min(
            architecture.getWallLeft(mrCroc.getPositionHeadLeft()),
            architecture.getWallLeft(mrCroc.getPositionFootLeft())
        );

        mrCroc.moveLeft(timestamp, delta);

        if (mrCroc.position.x <= lastWallLeft + mrCroc.getWidth() * 0.5) {
            mrCroc.position.x = lastWallLeft + mrCroc.getWidth() * 0.5 + 1;
        }
    } else if (!hasPlayerLeftArchitecture && KeyRight.isPressed()) {
        let lastWallRight = Math.max(
            architecture.getWallRight(mrCroc.getPositionHeadRight()),
            architecture.getWallRight(mrCroc.getPositionFootRight())
        );

        mrCroc.moveRight(timestamp, delta);

        if (mrCroc.position.x >= lastWallRight - mrCroc.getWidth() * 0.5) {
            mrCroc.position.x = lastWallRight - mrCroc.getWidth() * 0.5 - 1;
        }
    }

    if (!hasPlayerLeftArchitecture && !architecture.isInsideArchitecture(mrCroc.position)) {
        hasPlayerLeftArchitecture = true;

        setTimeout(
            function () {
                architecture.setMovableToStartPosition(mrCroc);
                hasPlayerLeftArchitecture = false;
            }, 2000
        );
    }

    camera.focusPosition(
        mrCroc.position.x - mrCroc.getWidth() * 0.5,
        mrCroc.position.y - mrCroc.getHeight() * 0.5,
        20
    );
    camera.lockCameraIntoBorders();

    /* Drawing */
    if (timestamp - lastRendered >= frameDuration) {
        context.clearRect(0, 0, window.innerWidth, window.innerHeight);

        architecture.draw(context, camera);
        mrCroc.draw(context, camera);
        gisela.draw(context, camera);

        lastRendered = timestamp;
    }

    lastTimestamp = timestamp;

    if (!gameFinished && mrCroc.isJumping === false && architecture.isMovableInsideTargetPosition(mrCroc)) {
        gameFinished = true;
        KeyLeft.pressed = false;
        KeyRight.pressed = false;
        KeyJump.pressed = false;
        lastTimestamp = undefined;
        lastRendered = undefined;

        alert('Gisela: "Thanks for showing up, Mr. Croc, but I\'m not in danger."');
    }

    window.requestAnimationFrame(MainLoop);
}

const GAME_SPEED = 1;
const GRAVITY = 2;
let fps;
let frameDuration;

let levelJson = new FileLoader('levels/moon.json');

const LEVEL = JSON.parse(levelJson.getContent());

let lastRendered = undefined;
let lastTimestamp = undefined;
let context;
let mrCroc, gisela, architecture;
let camera = new Camera();
let gameFinished = false;
let hasPlayerLeftArchitecture = false;

let KeyLeft = new Key('ArrowLeft');
let KeyRight = new Key('ArrowRight');
let KeyJump = new Key('Space');

let loader = new ImageLoader();

loader.addImage(Setting.GRAPHICS_LOCATION + 'mr-croc-walk-right.png');
loader.addImage(Setting.GRAPHICS_LOCATION + 'mr-croc-walk-left.png');
loader.addImage(Setting.TILESET_LOCATION + GraphicSet[LEVEL.tileset].tileset);
loader.addImage(Setting.GRAPHICS_LOCATION + 'gisela-right.png');

new FrameRateMeasurer();

window.addEventListener(
    'imagesloaded',
    () => {
        let canvas = document.getElementById('canvas');
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        canvas.style.backgroundAttachment = 'fixed';
        canvas.style.backgroundSize = 'cover';
        canvas.style.backgroundPosition = 'center center';

        if (GraphicSet[LEVEL.tileset].backgroundImage !== null) {
            canvas.style.backgroundImage = 'url("' + Setting.GRAPHICS_LOCATION + GraphicSet[LEVEL.tileset].backgroundImage +'")';
        }

        canvas.style.backgroundColor = LEVEL.backgroundColor;

        window.addEventListener(
            'resize',
            function () {
                canvas.width = window.innerWidth;
                canvas.height = window.innerHeight;
            }
        );

        context = canvas.getContext('2d');

        architecture = RetroArchitecture.createFromData(LEVEL);
        camera.borderRight = architecture.columns * architecture.tileWidth;
        camera.borderBottom = architecture.rows * architecture.tileHeight;

        mrCroc = new MrCroc();
        architecture.setMovableToStartPosition(mrCroc);

        gisela = new Gisela();
        architecture.setMovableToTargetPosition(gisela);

        fps = 120;
        frameDuration = 1000 / fps;
        window.requestAnimationFrame(MainLoop);
    }
);