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import Phaser from 'phaser';
import type { PlayerSprite } from './sprite';
import { Direction } from './Direction';
import AkkamonStartScene from './scene';
import {
akkamonClient
} from './app';
import {
StartMovingEvent
} from './events';
export class GridPhysics {
static movementDirectionVectors: {
[key in Direction]?: Phaser.Math.Vector2;
} = {
[Direction.UP]: Phaser.Math.Vector2.UP,
[Direction.DOWN]: Phaser.Math.Vector2.DOWN,
[Direction.LEFT]: Phaser.Math.Vector2.LEFT,
[Direction.RIGHT]: Phaser.Math.Vector2.RIGHT,
}
private movementDirection: Direction = Direction.NONE;
private readonly speedPixelsPerSecond: number = AkkamonStartScene.TILE_SIZE * 4;
private tileSizePixelsWalked: number = 0;
private lastMovementIntent = Direction.NONE;
constructor(
private playerSprite: PlayerSprite,
private tileMap: Phaser.Tilemaps.Tilemap
) { }
movePlayerSprite(direction: Direction): void {
this.lastMovementIntent = direction;
if (this.isMoving()) return;
if (this.isBlockingDirection(direction)) {
this.playerSprite.stopAnimation(direction);
} else {
this.startMoving(direction);
}
}
private isMoving(): boolean {
return this.movementDirection != Direction.NONE;
}
private startMoving(direction: Direction): void {
console.log("Sending startMovingEvent");
akkamonClient.send(
new StartMovingEvent(direction)
);
this.playerSprite.startAnimation(direction);
this.movementDirection = direction;
this.updatePlayerSpriteTilePosition();
}
update(delta: number): void {
if (this.isMoving()) {
this.updatePlayerSpritePosition(delta);
}
this.lastMovementIntent = Direction.NONE;
}
private updatePlayerSpritePosition(delta: number) {
const pixelsToWalkThisUpdate = this.getPixelsToWalkThisUpdate(delta);
if (!this.willCrossTileBorderThisUpdate(pixelsToWalkThisUpdate)) {
this.spriteMovement(pixelsToWalkThisUpdate);
} else if (this.shouldContinueMoving()) {
this.spriteMovement(pixelsToWalkThisUpdate);
this.updatePlayerSpriteTilePosition();
} else {
this.spriteMovement(AkkamonStartScene.TILE_SIZE - this.tileSizePixelsWalked);
this.stopMoving();
}
}
private updatePlayerSpriteTilePosition() {
this.playerSprite.setTilePos(
this.playerSprite
.getTilePos()
.add(GridPhysics.movementDirectionVectors[this.movementDirection]!)
);
}
private shouldContinueMoving(): boolean {
return (
this.movementDirection == this.lastMovementIntent &&
!this.isBlockingDirection(this.lastMovementIntent)
);
}
private spriteMovement(pixelsToMove: number) {
this.tileSizePixelsWalked += pixelsToMove;
this.tileSizePixelsWalked %= AkkamonStartScene.TILE_SIZE;
const directionVec = GridPhysics.movementDirectionVectors[
this.movementDirection
]!.clone();
const movementDistance = directionVec.multiply(
new Phaser.Math.Vector2(pixelsToMove)
);
const newPlayerPos = this.playerSprite.getPosition().add(movementDistance);
this.playerSprite.newPosition(newPlayerPos);
}
private willCrossTileBorderThisUpdate(
pixelsToWalkThisUpdate: number
): boolean {
return (
this.tileSizePixelsWalked + pixelsToWalkThisUpdate >= AkkamonStartScene.TILE_SIZE
);
}
private getPixelsToWalkThisUpdate(delta: number): number {
const deltaInSeconds = delta / 1000;
return this.speedPixelsPerSecond * deltaInSeconds;
}
private stopMoving(): void {
this.playerSprite.stopAnimation(this.movementDirection);
this.movementDirection = Direction.NONE;
}
private isBlockingDirection(direction: Direction): boolean {
return this.hasBlockingTile(this.tilePosInDirection(direction));
}
private tilePosInDirection(direction: Direction): Phaser.Math.Vector2 {
return this.playerSprite
.getTilePos()
.add(GridPhysics.movementDirectionVectors[direction]!);
}
private hasBlockingTile(pos: Phaser.Math.Vector2): boolean {
if (this.hasNoTile(pos)) return true;
return this.tileMap.layers.some((layer) => {
const tile = this.tileMap.getTileAt(pos.x, pos.y, false, layer.name);
return tile && tile.properties.collides;
});
}
private hasNoTile(pos: Phaser.Math.Vector2): boolean {
return !this.tileMap.layers.some((layer) =>
this.tileMap.hasTileAt(pos.x, pos.y, layer.name));
}
}
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