survivors: adding simple drops

moving size to world object
adding dying for enemies and projectiles and theoretically for players
adding pull range for player
adding money stat display
made pistol homing

absurd-survivors/src/drop.ts

@@ -0,0 +1,61 @@
+import type {Drop} from "./interfaces.ts";
+import {World} from "./World.ts";
+import {drawDot, moveInDirectionOf} from "./utils.ts";
+import {Vector} from "./base.ts";
+
+export class MoneyDrop implements Drop {
+    private world: World;
+    private worth: number;
+    private _position: Vector;
+    private _color: string;
+    private _size: number;
+
+
+    constructor(world: World, position: Vector) {
+        this.world = world;
+        this._position = position.clone();
+    }
+
+    draw(ctx: CanvasRenderingContext2D) {
+        drawDot(this._position, this.getSize(), this._color, ctx)
+    }
+
+    pickup() {
+        this.world.player.status.wealth += this.worth
+    }
+
+    getPosition(): Vector {
+        return this._position;
+    }
+
+    move() {
+    }
+
+    static createMoneyDrop(world: World, position?: Vector): MoneyDrop {
+        if(!position) {
+            position = world.randomPlace()
+        }
+        let drop = new MoneyDrop(world, position)
+        drop.worth = 1;
+        drop._size = 1;
+        drop._color = 'yellow';
+        world.addDrop(drop)
+        return drop;
+    }
+
+    act() {
+        let distanceToPlayer = this._position.distanceTo(this.world.player.position);
+        if(distanceToPlayer < (this.world.player.stats.size + this._size)) {
+            this.pickup()
+            this.world.removeDrop(this)
+        } else if(distanceToPlayer < this.world.player.stats.pullRange) {
+            let speedFactor = 125 / distanceToPlayer;
+            this._position = moveInDirectionOf(this._position, this.world.player.position,  speedFactor)
+        }
+    }
+
+    getSize() {
+        return this._size
+    }
+
+}