Victor.prototype.normalize = function () {
var length = this.length();
if (length === 0) {
this.x = 1;
this.y = 0;
} else {
this.divide(Victor(length, length));
}
return this;
};
updateEnemy: function(dt){
for(var i = 0; i<this.arrayBullets.length; i++){
this.arrayBullets[i].update(dt);
}
if(this.currentRestDur <= 0){
var spawnRate = Math.round(10.5 - (this.difficulty * .5));
if(spawnRate <= 2){
spawnRate = 2;
}
if(this.attackPattern == 0){
var radius = Math.min(9.5 + (this.difficulty *.5), 35);
if(this.currentAttackDur%spawnRate == 0){
var vec = victor(Math.random() *2 - 1, Math.random() * 2 - 1);
this.arrayBullets.push(bullet.create(320, 50, radius, vec.x * 100, vec.y * 100, "#FFFFFF"));
}
}
else if(this.attackPattern == 1){
var radius = Math.min(9.5 + (this.difficulty *.5), 15);
if(this.currentAttackDur == this.attackDur){
var vec = victor(Math.random() * 2 - 1, Math.random() * 2 - 1);
vec.normalize();
this.lastRotation = vec;
this.arrayBullets.push(bullet.create(320, 50, radius, vec.x * 100, vec.y * 100, "#FFFFFF"));
}
if(this.currentAttackDur%2 == 0){
var vec = this.lastRotation;
vec.rotate(Math.PI/(10 + (Math.random() *3)));
this.lastRotation = vec;
this.arrayBullets.push(bullet.create(320, 50, 10, vec.x * 100, vec.y * 100, "#FFFFFF"));
}
if(this.currentAttackDur%(spawnRate) == 0){
this.arrayBullets.push(bullet.create(320, 50, radius, (Math.random() *2 - 1) * 100, Math.random() * 100, "#FFFFFF"));
}
}
else if (this.attackPattern == 2){
var radius = Math.min(9.5 + (this.difficulty * .5), 20);
if(this.currentAttackDur%(spawnRate*5) == 0){
this.arrayBullets.push(bullet.create(320, 50, radius, (Math.random()* .5 - 1) * 100, 100, "#FFFFFF"));
this.arrayBullets.push(bullet.create(320, 50, radius, (Math.random() - .5) * 100, 100, "#FFFFFF"));
this.arrayBullets.push(bullet.create(320, 50, radius, (Math.random()* .5 + .5) * 100, 100, "#FFFFFF"));
}
}
else if (this.attackPattern == 3){
var radius = Math.min(7 + (this.difficulty * .5), 15);
if(this.currentAttackDur%(spawnRate*5) == 0){
this.arrayBullets.push(bullet.create(Math.random()*640, Math.random() * -10, radius, (Math.random()* .25 + .5) * 100, (Math.random()* .25 + .75)* 100, "#FFFFFF"));
this.arrayBullets.push(bullet.create(Math.random()*640, Math.random() * -10, radius, (Math.random()* .25 + .5) * 100, (Math.random()* .25 + .75)* 100, "#FFFFFF"));
this.arrayBullets.push(bullet.create(Math.random()*640, Math.random() * -10, radius, (Math.random()* .25 + .5) * 100, (Math.random()* .25 + .75)* 100, "#FFFFFF"));
}
if(this.currentAttackDur%60 == 0){
for(var i = 0; i<this.arrayBullets.length; i++){
this.arrayBullets[i].velocity.x *= -1;
}
}
}
else if (this.attackPattern == 4){
var radius = Math.min(7 + (this.difficulty * .5), 14);
// spawn bullets will low speed
if(this.currentAttackDur%60 > 30){
if(this.currentAttackDur%spawnRate == 0){
this.arrayBullets.push(bullet.create(Math.random()*640, Math.random() * 100 - 25, radius, Math.random()*.5 + .5, Math.random() * .5 + .5, "#FFFFFF"));
this.arrayBullets.push(bullet.create(Math.random()*640, Math.random() * 100 - 25, radius, Math.random()*.5 - 1.5, Math.random() * .5 + .5, "#FFFFFF"));
}
}
// increase bullets speed starting from startIndex
else{
for(var i = 0; i<this.arrayBullets.length; i++){
if(this.arrayBullets[i].velocity.x < -50)
{
}
else if(this.arrayBullets[i].velocity.x < 50 && this.arrayBullets[i].velocity.x > -50){
this.arrayBullets[i].velocity.x *= 1.1;
}
else{
}
if(this.arrayBullets[i].velocity.y < 100){
this.arrayBullets[i].velocity.y *= 1.2;
}
else {
}
}
}
}
this.currentAttackDur--;
// change attack pattern and let the enemy rest for a short duration
if(this.currentAttackDur <= 0){
this.currentAttackDur = this.attackDur;
this.currentRestDur = this.restDur;
var lastPattern = this.attackPattern;
this.attackPattern = Math.floor(Math.random()*5);
// reduce change of enemy choosing the same pattern over and over again
if(lastPattern == this.attackPattern){
this.attackPattern = Math.floor(Math.random()*5);
}
}
}
else{
this.currentRestDur--;
}
// remove bullets that are out of bound
this.arrayBullets = this.arrayBullets.filter(function(bullet){
return bullet.active;
});
},