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ship.js
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ship.js
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var Asteroids = (function (Lib) {
Lib.Ship = (function () {
function Ship(pos) {
var that = this;
this.pos = pos;
this.direction = Math.PI / 2;
this.velocity = {x : 0, y : 0};
this.radius = 5;
this.firedBullets = [];
key('left', function() { that.rotate('left'); });
key('right', function() { that.rotate('right'); });
key('up', function() { that.power(); });
key('down', function() { that.decelerate(); });
key('space', function() { that.fireBullet(); });
}
Ship.inherits(Lib.MovingObject);
Ship.prototype.draw = function (ctx) {
ctx.fillStyle = 'red';
ctx.save();
ctx.translate(this.pos.x, this.pos.y);
ctx.rotate(this.direction);
ctx.beginPath();
ctx.moveTo(0 , -14);
ctx.lineTo(10, 11);
ctx.lineTo(-10, 11);
ctx.lineTo(0, -14);
ctx.fill();
ctx.strokeStyle = 'black';
ctx.lineWidth = 1.5;
ctx.stroke();
ctx.restore();
};
Ship.prototype.power = function () {
var acceleration = this.calculateForwardDir();
this.velocity = { x : this.velocity.x + acceleration.x * 0.03,
y : this.velocity.y + acceleration.y * 0.03};
};
Ship.prototype.decelerate = function () {
this.velocity = {x : this.velocity.x / 1.1,
y : this.velocity.y / 1.1};
};
Ship.prototype.rotate = function(direction) {
var rotationScale = 0.2;
if (direction === 'left') {
this.direction -= rotationScale;
} else if (direction === 'right') {
this.direction += rotationScale;
}
};
Ship.prototype.deleteOffscreenBullets = function () {
for (var i = 0; i < this.firedBullets.length; i++) {
if (this.firedBullets[i].isOffBoard) {
this.removeBullet(i);
i--; //corrects for removed element
}
}
};
Ship.prototype.fireBullet = function () {
var pos = { x : this.pos.x, y : this.pos.y };
var newBullet = new Asteroids.Bullet(pos, this.direction);
this.firedBullets.push(newBullet);
};
Ship.prototype.removeBullet = function (idx) {
this.firedBullets.splice(idx, 1)
};
return Ship;
})();
return Lib;
}) (Asteroids || {});