create unit layer

src/client/graphics/layers/UnitLayer.ts

@@ -0,0 +1,103 @@
+import { Colord } from "colord";
+import { Theme } from "../../../core/configuration/Config";
+import { Boat, BoatEvent, Cell, Game, Tile } from "../../../core/game/Game";
+import { bfs, dist } from "../../../core/Util";
+import { Layer } from "./Layer";
+import { EventBus } from "../../../core/EventBus";
+
+export class UnitLayer implements Layer {
+    private canvas: HTMLCanvasElement
+    private context: CanvasRenderingContext2D
+    private imageData: ImageData
+
+    private boatToTrail = new Map<Boat, Set<Tile>>()
+
+    private theme: Theme = null
+
+    constructor(private game: Game, private eventBus: EventBus) {
+        this.theme = game.config().theme()
+    }
+
+    shouldTransform(): boolean {
+        return true
+    }
+
+    tick() {
+    }
+
+    init(game: Game) {
+        this.canvas = document.createElement('canvas');
+        this.context = this.canvas.getContext("2d")
+
+        this.imageData = this.context.getImageData(0, 0, this.game.width(), this.game.height())
+        this.canvas.width = this.game.width();
+        this.canvas.height = this.game.height();
+        this.context.putImageData(this.imageData, 0, 0);
+        this.initImageData()
+
+        this.eventBus.on(BoatEvent, e => this.onBoatEvent(e))
+    }
+
+    initImageData() {
+        this.game.forEachTile((tile) => {
+            const index = (tile.cell().y * this.game.width()) + tile.cell().x
+            const offset = index * 4
+            this.imageData.data[offset + 3] = 0
+        })
+    }
+
+    renderLayer(context: CanvasRenderingContext2D) {
+        this.context.putImageData(this.imageData, 0, 0);
+        context.drawImage(
+            this.canvas,
+            -this.game.width() / 2,
+            -this.game.height() / 2,
+            this.game.width(),
+            this.game.height()
+        )
+    }
+
+
+    onBoatEvent(event: BoatEvent) {
+        if (!this.boatToTrail.has(event.boat)) {
+            this.boatToTrail.set(event.boat, new Set<Tile>())
+        }
+        const trail = this.boatToTrail.get(event.boat)
+        trail.add(event.oldTile)
+        bfs(event.oldTile, dist(event.oldTile, 3)).forEach(t => {
+            this.clearCell(t.cell())
+        })
+        if (event.boat.isActive()) {
+            bfs(event.boat.tile(), dist(event.boat.tile(), 4)).forEach(
+                t => {
+                    if (trail.has(t)) {
+                        this.paintCell(t.cell(), this.theme.territoryColor(event.boat.owner().info()), 150)
+                    }
+                }
+            )
+            bfs(event.boat.tile(), dist(event.boat.tile(), 2)).forEach(t => this.paintCell(t.cell(), this.theme.borderColor(event.boat.owner().info()), 255))
+            bfs(event.boat.tile(), dist(event.boat.tile(), 1)).forEach(t => this.paintCell(t.cell(), this.theme.territoryColor(event.boat.owner().info()), 180))
+        } else {
+            trail.forEach(t => this.clearCell(t.cell()))
+            this.boatToTrail.delete(event.boat)
+        }
+    }
+
+
+    paintCell(cell: Cell, color: Colord, alpha: number) {
+        const index = (cell.y * this.game.width()) + cell.x
+        const offset = index * 4
+        this.imageData.data[offset] = color.rgba.r;
+        this.imageData.data[offset + 1] = color.rgba.g;
+        this.imageData.data[offset + 2] = color.rgba.b;
+        this.imageData.data[offset + 3] = alpha
+    }
+
+    clearCell(cell: Cell) {
+        const index = (cell.y * this.game.width()) + cell.x;
+        const offset = index * 4;
+        this.imageData.data[offset + 3] = 0; // Set alpha to 0 (fully transparent)
+    }
+
+
+}