Bootstrapping the Quintus Engine: Part III - HTML5 Mobile Game Development - page 199

init: function(props) {
this.p = _({
x: 0,
y: 0,
z: 0,
frame: 0,
type: 0
}).extend(props||{});
if((!this.p.w || !this.p.h)) {
if(this.asset()) {
this.p.w = this.p.w || this.asset().width;
this.p.h = this.p.h || this.asset().height;
} else if(this.sheet()) {
this.p.w = this.p.w || this.sheet().tilew;
this.p.h = this.p.h || this.sheet().tileh;
}
}
this.p.id = this.p.id || _.uniqueId();
},
asset: function() {
return Q.asset(this.p.asset);
},
sheet: function() {
return Q.sheet(this.p.sheet);
},
draw: function(ctx) {
if(!ctx) { ctx = Q.ctx; }
var p = this.p;
if(p.sheet) {
this.sheet().draw(ctx, p.x, p.y, p.frame);
} else if(p.asset) {
ctx.drawImage(Q.asset(p.asset),
Math.floor(p.x),
Math.floor(p.y));
}
this.trigger('draw',ctx);
},
step: function(dt) {
this.trigger('step',dt);
}
});