content/hifi-public/philip/boxer.js

//
//  Boxer.js 
//  
//  Make yourself into a boxer, with your hands having spheres that strike others 
//  

var GLOVE_SIZE = 0.20;
var GLOVE_COLOR = { red: 128, green: 128, blue: 126 };
var HIT_COLOR = { red: 255, green: 0, blue: 0 };
var BLOCK_COLOR = { red: 0, green: 255, blue: 0 };

var HIT_SOUND = SoundCache.getSound("https://s3.amazonaws.com/hifi-public/philip/boxing_hit.wav");

var leftHand = {
	position: { x: 0, y: 0, z: 0 },
	lastPosition: { x: 0, y: 0, z: 0 },
	velocity: { x: 0, y: 0, z: 0 },
	hitting: false, 
	blocked: false,
	waitingToClear: false,
	entity: null
};
var rightHand = {
	position: { x: 0, y: 0, z: 0 },
	lastPosition: { x: 0, y: 0, z: 0 },
	velocity: { x: 0, y: 0, z: 0 },
	hitting: false, 
	blocked: false,
	waitingToClear: false,
	entity: null
};

//  Start: Rez some spheres on your hands 
leftHand.entity = Entities.addEntity({
	type: "Sphere",
	localPosition: { x: 0, y: 0, z: 0 },
	collidesWith: "static",
	dimensions: { x: GLOVE_SIZE, y: GLOVE_SIZE, z: GLOVE_SIZE },
	parentID: MyAvatar.sessionUUID,
	parentJointIndex: MyAvatar.getJointIndex("LeftHandMiddle2"),
	color: GLOVE_COLOR
});
rightHand.entity = Entities.addEntity({
	type: "Sphere",
	localPosition: { x: 0, y: 0, z: 0 },
	collidesWith: "static",
	dimensions: { x: GLOVE_SIZE, y: GLOVE_SIZE, z: GLOVE_SIZE },
	parentID: MyAvatar.sessionUUID,
	parentJointIndex: MyAvatar.getJointIndex("RightHandMiddle2"),
	color: GLOVE_COLOR
});

function getClosestAvatar() {
    var workQueue = AvatarList.getAvatarIdentifiers();
    var closestDistance = 100;
    var whichAvatar = -1;
    for (var i = 0; i < workQueue.length; i++) {
        var avatar = AvatarList.getAvatar(workQueue[i]), avatarPosition = avatar && avatar.position;
        if (avatarPosition) {
        	var distance = Vec3.length(Vec3.subtract(avatar.position, MyAvatar.position)); 
        	if (distance < closestDistance && (distance > 0)) {
        		closestDistance =  distance; 
        		whichAvatar = i;
        	}
        }
    }
    if (whichAvatar >= 0) {
    	return  AvatarList.getAvatar(workQueue[whichAvatar]);
    } else {
    	return null;
    }
}

function updateHand(hand, deltaTime, enemy) {
	props = Entities.getEntityProperties(hand.entity);
	hand.position = props.position; 
	hand.velocity = Vec3.length(hand.position, hand.lastPosition) / deltaTime; 
	if (enemy) {
		//  Check for hit to hand 
		var head = enemy.getJointPosition("Head"); 
		if (!hand.hitting && (Vec3.distance(head, hand.position) < GLOVE_SIZE / 2)) {
			print("startHit");
			Entities.editEntity(hand.entity, { color: HIT_COLOR });
			hand.hitting = true;
			Audio.playSound(HIT_SOUND, {
                                        position: hand.position,
                                        volume: 1.0,
                                        loop: false } );
		} else if (hand.hitting && (Vec3.distance(head, hand.position) > GLOVE_SIZE)) {
			print("endHit");
			Entities.editEntity(hand.entity, { color: GLOVE_COLOR });
			hand.hitting = false; 
		}
		// Check for successful block 
		enemyHands = [enemy.getJointPosition("LeftHandMiddle2"), enemy.getJointPosition("RightHandMiddle2")];
		for (var i = 0; i < 2; i++) {
			var distanceToHand = Vec3.distance(hand.position, enemyHands[i]);
			if (!hand.blocked && (distanceToHand < GLOVE_SIZE / 2)) {
				Entities.editEntity(hand.entity, { color: BLOCK_COLOR });
				print("Start Blocked");
				hand.blocked = true;
			} else if (hand.blocked && (distanceToHand > GLOVE_SIZE)) {
				if (!hand.waitingToClear) {
					hand.waitingToClear = true;
					Script.setTimeout(clearBlock, 500);
				}
			}
		}
	}
	hand.lastPosition = props.position;
}

function clearBlock() {
	Entities.editEntity(leftHand.entity, { color: GLOVE_COLOR });
	Entities.editEntity(rightHand.entity, { color: GLOVE_COLOR });
	leftHand.blocked = false;
	rightHand.blocked = false;
	leftHand.waitingToClear = false; 
	rightHand.waitingToClear = false;
	print("End Blocked");
}

//  Update:  Check for collisions and update colors accordingly
function update(deltaTime) {
	var enemy = getClosestAvatar(); 
	updateHand(leftHand, deltaTime, enemy);
	updateHand(rightHand, deltaTime, enemy);
}

//  Finish:  Cleanup spheres
function cleanup() {
    Entities.deleteEntity(leftHand.entity);
    Entities.deleteEntity(rightHand.entity);
}

Script.update.connect(update);
Script.scriptEnding.connect(cleanup);