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Weather.prototype.initializeWeather.prototype._updateAllSprites
/**
* @method _updateAllSprites
* @private
*/
Weather.prototype._updateAllSprites = function() {
var maxSprites = Math.floor(this.power * 10);
while (this._sprites.length < maxSprites) {
this._addSprite();
}
while (this._sprites.length > maxSprites) {
this._removeSprite();
}
this._sprites.forEach(function(sprite) {
this._updateSprite(sprite);
sprite.x = sprite.ax - this.origin.x;
sprite.y = sprite.ay - this.origin.y;
}, this);
};Weather.prototype._updateRainSprite
/**
* @method _updateRainSprite
* @param {Sprite} sprite
* @private
*/
Weather.prototype._updateRainSprite = function(sprite) {
sprite.bitmap = this._rainBitmap;
sprite.rotation = Math.PI / 16;
sprite.ax -= 6 * Math.sin(sprite.rotation);
sprite.ay += 6 * Math.cos(sprite.rotation);
sprite.opacity -= 6;
};