Game Development Reference
In-Depth Information
this.totalCoins -= cost;
player.coins = this.totalCoins;
this.updatePurse(cost);
this.evaluatePurse();
}
p.updatePurse = function (cost) {
var xPos = this.coinsTxt.x;
var yPos = this.coinsTxt.y;
this.removeChild(this.coinsTxt);
this.coinsTxt = this.getBitmapTxt('x' + this.totalCoins, xPos, yPos,
.6);
this.addChild(this.coinsTxt);
}
p.evaluatePurse = function () {
var i, btn, cost;
var btns = ['potion', 'fire', 'earth', 'lightning' ];
var len = btns.length;
for (i = 0; i < len; i++) {
cost = this.magicData[btns[i]];
btn = this.getChildByName('btn_' + btns[i]);
if (cost > this.totalCoins) {
btn.disableButton();
}
}
}
window.game.MagicShop = MagicShop;
}());
The player's total coins is referenced from
PlayerData
and set to the
totalCoins
property, and the cost of each
item is referenced from
GameData
and set to
magicData
. These values will be used when determining if the player
can buy an item or not. They are also used to build the messaging for the shop in
addStoreMessaging
and
addPurse
functions. These messages are built in the same fashion as the level messaging back in the
LevelComplete
class.
A small, animated sprite of a spinning coin is added next to the coins text for a nice visual effect.
Next, the shop items are created in the
addItemButtons
method. The attack buttons are reused for the shop, and
their enablement is determined by the cost of each item and the player's total coins. Their
quantity
message is set by
the current inventory of the player, and their positioning uses the same approach as when added to the
BattlePanel
class. The complete level complete screen is shown in full with the magic shop in Figure
14-18
.
