2019js13k/js/Sheep.js

class Sheep {

	constructor(game, controller) {
		this.id = 0;
		this.position = { x: 0, y: 0 };
		this.targetPosition = { x: 0, y: 0 };
		this.velocity = { x: 0.0, y: 0.0 };
		this.controller = controller;
		this.acceleration = { x: 0, y: 0, speed: 0.08 };
		this.width = 30;
		this.height = 30;
		this.maxSpeed = 2;
		this.turnRate = Math.PI / 64;
		this.targetAngle = 0;
		this.angleRadians = 0;
		this.color = "white";
		this.name = "Sheep";
		this.spriteCanvas = null;
		this.spriteContext = null;
		this.isAccelerating = false;

		this.isDead = false;

		this.health = 5;
		this.maxHealth = 5;

		this.seen = [];
	}


	init(systemObject) {
		this.system = systemObject;
		this.controller.init(this);
		this.color = "white";

		this.controller.init(systemObject, this);

		this.respawn();
	}

	update(delta) {
		if (this.isDead) {
			return;
		}

		if (this.health <= 0) {
			this.die();
			return;
		}

		this.angleRadians = this.system.angleTo(this.position, this.targetPosition);

		if (this.targetPosition.x != this.position.x) {
			if (Math.abs(this.position.x - this.targetPosition.x) < this.maxSpeed) {
				this.position.x = this.targetPosition.x;
				this.targetAngle = this.angleRadians;
			} else {
				this.targetAngle = this.angleRadians;
				this.position.x += this.maxSpeed * Math.cos(this.angleRadians) * delta;
			}
		}

		if (this.targetPosition.y != this.position.y) {
			if (Math.abs(this.position.y - this.targetPosition.y) < this.maxSpeed) {
				this.position.y = this.targetPosition.y;
				this.targetAngle = this.angleRadians;
			} else {
				this.targetAngle = this.angleRadians;
				this.position.y += (this.maxSpeed) * Math.sin(this.angleRadians) * delta;
			}
		}

		if(this.isRunningAway) {
			if(this.targetPosition.x == this.position.x &&
				this.targetPosition.y == this.position.y) {
				setTimeout(() => {
				this.isRunningAway = false;
				}, 300);
			}
		}
	}

	control(player) {
		this.controller.makeDecisions(player);
	}

	respawn() {
		this.position.x = Math.floor(200 * Math.random() - 100);
		this.position.y = Math.floor(200 * Math.random() - 100);
		this.targetPosition.x = this.position.x;
		this.targetPosition.y = this.position.y;
		this.targetAngle = Math.floor(360 * Math.random());
	}

	die() {
		this.health = 0;
		if (!this.isDead) {
			var sheep = this;
			setTimeout(function () { sheep.respawn(); }, 3000);
			this.isDead = true;
		}
	}

	walkUp() {
		this.targetPosition.y = this.position.y - this.maxSpeed;
	}

	walkDown() {
		this.targetPosition.y = this.position.y + this.maxSpeed;
	}

	walkLeft() {
		this.targetPosition.x = this.position.x - this.maxSpeed;
	}

	walkRight() {
		this.targetPosition.x = this.position.x + this.maxSpeed;
	}

	walkTowards(newPosition) {
		this.targetPosition.x = parseInt(newPosition.x);
		this.targetPosition.y = parseInt(newPosition.y);
	}

	preRender(context, angle) {
		if (angle == null) {
			angle = 0;
		}
		context.fillStyle = this.color;
		context.strokeStyle = this.color;
		context.lineWidth = 4;

		context.save();

		context.translate(this.width / 2, this.height / 2);
		context.rotate(angle);
		// context.beginPath();
		// context.moveTo(this.width / 2, 0);
		// context.lineTo(-(this.width / 2), -(this.height / 3));
		// context.lineTo(-(this.width / 2), this.height / 3);
		// context.lineTo(this.width / 2, 0);
		// context.fill();


		context.beginPath();
		context.arc(0, 0, this.width / 4, 0, 2 * Math.PI);
		context.fill();

		context.beginPath();
		context.arc(this.width / 6, 0, this.width / 6, 0, 2 * Math.PI);
		context.fill();

		context.restore();
	}

	draw(context) {

		if (this.spriteContext == null) {
			this.spriteCanvas = document.createElement("canvas");
			this.spriteCanvas.width = this.width;
			this.spriteCanvas.height = this.height;
			this.spriteContext = this.spriteCanvas.getContext("2d");

			this.preRender(this.spriteContext);
		}

		if (this.isDead) {
			return;
		}

		context.save();
		context.translate(this.position.x, this.position.y);
		context.rotate(this.targetAngle);
		if (this.isAccelerating) {
			context.fillStyle = "#7777FF";

			context.beginPath();
			context.moveTo(-this.width - 5, 0);
			context.lineTo(-this.width / 2, 3);
			context.lineTo(-this.width / 2, -3);
			context.lineTo(-this.width - 5, 0);

			context.fill();
		}
		context.drawImage(this.spriteCanvas, 0, 0, this.spriteCanvas.width, this.spriteCanvas.height,
			-this.spriteCanvas.width / 2, -this.spriteCanvas.height / 2, this.width, this.height);

		context.strokeStyle = "#00FF00";
		if (this.isTakingDamage) {
			context.strokeStyle = "#FF0000";
			this.isTakingDamage = false;
		}

		context.restore();

		this.controller.debugDraw(context);
	}

	trigger(eventId) {
		if (this.seen.indexOf(eventId) == -1) {
			this.seen.push(eventId);
			return true;
		}
		return false;
	}
}