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feat(#15): add basic character and update camera to follow it

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This commit is contained in:
Juan Sebastián Montoya 2024-09-20 00:46:42 -05:00
parent 37a7b76d38
commit 9d635eadb8
7 changed files with 214 additions and 45 deletions
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4
index.html
View file

@ -19,6 +19,10 @@
id="overworld"
src="resources/overworld.png"
/>
<img
id="character"
src="resources/character.png"
/>
</div>
<div id="container">
<button id="debug">Debug</button>

33
index.js
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@ -1,4 +1,4 @@
import { GAME_HEIGHT, GAME_WIDTH } from "./modules/constants.js";
import { GAME_HEIGHT, GAME_WIDTH, TILE_SIZE } from "./modules/constants.js";
import {
Camera,
CanvasResizer,
@ -6,6 +6,7 @@ import {
GameObject,
MapManagement,
} from "./modules/game-objects/index.js";
import { Player, SpriteSheet } from "./modules/game-objects/player.js";
const backgroundMaps = [
{
@ -29,6 +30,24 @@ const foregroundMaps = [
{ name: "ocean", imageId: "overworld", elementId: "level2", layer: 2 },
];
const foregroundCollisionMaps = [
{
name: "overworld",
imageId: "overworld",
elementId: "level1",
layer: 2,
selected: true,
collision: true,
},
{
name: "ocean",
imageId: "overworld",
elementId: "level2",
layer: 2,
collision: true,
},
];
const clicableObjects = ["debug", "level1", "level2"];
class Game extends GameObject {
@ -41,11 +60,23 @@ class Game extends GameObject {
height: GAME_HEIGHT,
percentage: 0.9,
});
const player = new Player({
speed: 1,
gameObjects: [new SpriteSheet({ imageId: "character", tileHeight: 32 })],
x: 6 * TILE_SIZE,
y: 4 * TILE_SIZE,
width: TILE_SIZE,
height: 2 * TILE_SIZE,
debug: true,
});
const camera = new Camera({
gameObjects: [
new MapManagement({ maps: backgroundMaps }),
new MapManagement({ maps: foregroundMaps }),
player,
new MapManagement({ maps: foregroundCollisionMaps }),
],
target: player,
});
const fpsCounter = new FpsCounter({ debug: false });
this.gameObjects = [canvasResizer, camera, fpsCounter];

51
modules/game-objects/camera.js
View file

@ -9,41 +9,23 @@ export class Camera extends GameObject {
width = GAME_WIDTH,
height = GAME_HEIGHT,
speed = 1,
target = { x: 0, y: 0, width: 0, height: 0 }, // A camera that follows a target
}) {
super({ x, y, gameObjects, width, height });
this.speed = speed;
this.keys = [
{ key: "ArrowUp", pressed: false, value: [0, -1] },
{ key: "ArrowDown", pressed: false, value: [0, 1] },
{ key: "ArrowLeft", pressed: false, value: [-1, 0] },
{ key: "ArrowRight", pressed: false, value: [1, 0] },
];
this.availableKeys = this.keys.reduce(
(acc, item) => ({ ...acc, [item.key]: item }),
{}
);
this.eventEmitter.on("changeLevel", () => {
this.target = target;
this.eventEmitter.on("levelChanged", () => {
this.x = x;
this.y = y;
});
this.eventEmitter.on("targetChanged", (target) => {
this.target = target;
});
}
update(delta) {
this.keys.forEach((item) => {
if (item.pressed) {
this.moveCamera(...item.value, delta);
}
});
}
onKeyPressed(key) {
if (!this.availableKeys[key]) return;
this.availableKeys[key].pressed = true;
}
onKeyReleased(key) {
if (!this.availableKeys[key]) return;
this.availableKeys[key].pressed = false;
super.update(delta);
this.followTarget();
}
render(ctx) {
@ -52,16 +34,19 @@ export class Camera extends GameObject {
);
}
moveCamera(dx, dy, delta) {
followTarget() {
const { x, y, width: tWidth, height: tHeight } = this.target;
const centerX = x + tWidth / 2;
const centerY = y + tHeight / 2;
const [item] = this.gameObjects;
const { height, width } = item.selected ?? item;
this.x = Math.min(
Math.max(this.x + dx * Math.floor(delta * this.speed * 100), 0),
width * TILE_SIZE - this.width
this.x = Math.max(
0,
Math.min(centerX - this.width / 2, width * TILE_SIZE - this.width)
);
this.y = Math.min(
Math.max(this.y + dy * Math.floor(delta * this.speed * 100), 0),
height * TILE_SIZE - this.height
this.y = Math.max(
0,
Math.min(centerY - this.height / 2, height * TILE_SIZE - this.height)
);
}
}

2
modules/game-objects/map-management.js
View file

@ -27,6 +27,6 @@ export class MapManagement extends GameObject {
}
const map = this.gameObjects.find((item) => item.elementId === elementId);
this.selected = map.name;
this.eventEmitter.emit("changeLevel");
this.eventEmitter.emit("levelChanged");
}
}

118
modules/game-objects/player.js Normal file
View file

@ -0,0 +1,118 @@
import { GAME_HEIGHT, GAME_WIDTH, TILE_SIZE } from "../constants.js";
import { GameObject } from "./game-object.js";
export class Sprite extends GameObject {
constructor({ image, x = 0, y = 0, width = 0, height = 0 }) {
super({ x, y, height, width });
this.image = image;
this.imageWidth = this.image.width;
this.imageHeight = this.image.height;
}
render(ctx, sourceX, sourceY) {
ctx.drawImage(
this.image,
this.x,
this.y,
this.width,
this.height,
sourceX,
sourceY,
this.width,
this.height
);
}
}
export class SpriteSheet extends GameObject {
constructor({
imageId,
x = 0,
y = 0,
tileWidth = 16,
tileHeight = 16,
offsetX = 0,
offsetY = 0,
}) {
super({ x, y });
this.image = document.getElementById(imageId);
this.imageWidth = this.image.width;
this.imageHeight = this.image.height;
this.tileWidth = tileWidth;
this.tileHeight = tileHeight;
this.offsetX = offsetX;
this.offsetY = offsetY;
this.sprites = this._getSprites();
}
_getSprites() {
const sprites = [];
for (let row = 0; row < this.imageHeight; row += this.tileHeight) {
for (let col = 0; col < this.imageWidth; col += this.tileHeight) {
sprites.push(
new Sprite({
image: this.image,
x: col + this.offsetX,
y: row + this.offsetY,
width: this.tileWidth,
height: this.tileHeight,
})
);
}
}
return sprites;
}
}
export class Player extends GameObject {
constructor({ gameObjects = [], x = 0, y = 0, speed = 1, ...args }) {
super({ x, y, gameObjects, ...args });
this.speed = speed;
this.keys = [
{ key: "ArrowUp", pressed: false, value: [0, -1] },
{ key: "ArrowDown", pressed: false, value: [0, 1] },
{ key: "ArrowLeft", pressed: false, value: [-1, 0] },
{ key: "ArrowRight", pressed: false, value: [1, 0] },
];
this.availableKeys = this.keys.reduce(
(acc, item) => ({ ...acc, [item.key]: item }),
{}
);
this.eventEmitter.on("levelChanged", (...args) => {
this.x = x;
this.y = y;
});
}
update(delta) {
this.keys.forEach((item) => {
if (item.pressed) {
this.moveCharacter(...item.value, delta);
}
});
}
onKeyPressed(key) {
if (!this.availableKeys[key]) return;
this.availableKeys[key].pressed = true;
}
onKeyReleased(key) {
if (!this.availableKeys[key]) return;
this.availableKeys[key].pressed = false;
}
render(ctx, ...args) {
const [x, y] = args;
const [spriteSheet] = this.gameObjects;
const [item] = spriteSheet.sprites;
item.render(ctx, this.x - x, this.y - y);
}
moveCharacter(dx, dy, delta) {
const speed = Math.floor(delta * this.speed * 100);
this.x = this.x + dx * speed;
this.y = this.y + dy * speed;
// TODO: Check for collisions and stop movement if needed
}
}

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resources/character.png Normal file
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51
resources/overworld.json
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@ -33,17 +33,48 @@
"x":0,
"y":0
},
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@ -55,8 +86,8 @@
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"name":"Tile Layer 3",
"opacity":1,
"type":"tilelayer",
"visible":true,
@ -64,7 +95,7 @@
"x":0,
"y":0
}],
"nextlayerid":3,
"nextlayerid":8,
"nextobjectid":1,
"orientation":"orthogonal",
"renderorder":"right-down",