I want to make an ARCore app where you can select what you want to place. Does anyone know how to do this
If you are using the default example, you can change the line:
public GameObject m_andyAndroidPrefab;
to the line:
public List<GameObject> m_Prefabs;
In your Update() method, change the existing Instantiate invocation with this:
var object = Instantiate(m_Prefabs[m_currentObjectIndex],
hit.Point, Quaternion.identity, anchor.transform);
m_currentObjectIndex is an integer that holds the current index of the desired prefab to create. You will need to update this field when the user selects an object in your menu, for example.
Related
We are a looking for a value type design pattern in swift that will allow us to create a shopping cart to hold Products. We are currently using a class but that is a reference type and when we try to add two different version of the same product (i.e. with a different colors or sizes), the first item we added gets changed to the second item we added because it points to the same object in memory.
The design pattern needs to be “global” so we can access it from any page in the app. Right now this is our Cart class that stores all the items in the cart. What do we need to do to make this a value type or how does it need to be reengineered to use a struct without a class?
class Cart : NSObject {
var allProductsInCart = [MainProduct]()
override init() {
super.init()
}
class var sharedCart: Cart {
struct Static {
static let instance = Cart()
}
return Static.instance
}
}
The problem we are getting is that we need the products in the cart to be of custom class “MainProduct.” Right now as you can see, they are stored as “MainProduct.” Do we need to switch the products to a struct or other design pattern as well? How would we do that?
Yes, given the desired behavior between a value type vs. reference type you should use a Struct.
A commonly used "pattern" for doing this is called "Redux".
The idea is that you have one, immutable version of the "state" of your app.
It can be accessed from anywhere and the only way to update it is through "actions". These will reconstruct the entire state with the required updates.
ViewControllers and views, etc... subscribe to updates of various parts of the state.
So you could have an AppState that contains a ShoppingCartState. When a product is added to it your CartViewController will be informed of this update and can update its view etc...
There are many different frameworks that are built to use Redux so I won't recommend one as you should find the one that is right for you. But I believe this pattern best suits the usage you are after.
I have an question about binding:
I have an array of objects of my custom class: Array. Every object can be updated (change his properties value) in bg.
Also I have separated Controller, which take and store one object from list as variable and can update it (object still the same, so in list it will be updated too)
Is there any way to bind all object.property -> UILabels on Controller in way, when property changes automatically call label update?
Of course, there are multiple ways how to do it, but from your description I would use some kind of subject (because u said there will be changes in background so you will probably need hot observable )....For example Variable or PublishSubject. So you can crate
let myArrayStream: Variable<[MyObject]> = Variable([])
you can pass this variable as dependency to wherever you want, on one side you can subscribe to it, on the other side you can update it's value.
I'm trying to learn Grails but am still pretty much on beginner level.
I made a tiny application, where you can basically add events, and people can write reviews about them and rate them.
So I have an eventController and reviewController. The rating is just an Integer in a review. But now I want to show an overall rating for an event. So the events rating should be the average value of the corresponding ratings value.
This is my event domain code where the rating is initially set, I left out the constraints and toString:
class Event {
Double dRating = 2
static hasMany = [ratings:Rating]
}
The controller is simply:
class EventController {
def scaffold = Event
}
The rating domain file:
class Rating {
String comment
java.util.Date date = new java.util.Date()
Integer rating
Event event
}
and the Rating Controller is:
class RatingController {
def scaffold = Rating
}
Hope I didn't make mistakes, I had to translate variable names so they're understandable.
I'm guessing that where dRating is set, I could somehow add some calculation, but I don't even know how to access the values of the rating, and everything I try ends in lots of errors and having to restart the app again and again. I tried adding calculations in the controller, but there I don't know how to get the value into the database. So where do I actually put the logic, and how do I access the values?
If any other file is important, please tell me.
Hoping to get some hints on how to start doing this, I didn't think it would be this hard.
At first I would recommend start reading grails doc. Later from your question it is not much clear what you are asking a there could be several places or possibilities of setting up the value in domain field and persist it to database. I'm telling all of these which are known to me:
If it is generalised calculation that needs to be applied to your dRating field, then create a setter with standard bean naming convention and do this there. For example, you want to find percentage from say 1000 and then add it to dRating
class Event {
static hasMany = [ratings:Rating]
Double dRating
void setDRating(Double value){
this.dRating = value * 100/1000 // alternatively value /10
}
}
Do it in commandObject: If you don't want to put certain calculations and validation in domain then put these in command objects. See this. You can at any point of time assign values from command object to domain object by .properties binding mechanism. For example,
yourDomainObject.properties = yourcommandObjectObject.properties
Remember properties having same name would be binded.
Do it in service: You can do your calculations in service method, inject that service into your controller and call that method to perform calculations and even to persist to db as well. Remember services are by default transactional.
Hope it helps!
I'm creating an app that allows co-workers to upload shifts (objects) to Parse that they need covered. I save all the shifts to a "Shifts" class (in the data browser). I want to restrict the ALC so that only the person who uploaded the shift/object can edit it (everyone can "read" it). Is there a way that I can create/upload that programmatically (rather than having to go into the Data Browser and add it manually)?
You can create a relationship between your Shifts and your existing _User table. If you add a shift, you can create a relationship to the _User table. Than, if you retrieve the info, you can check if the user who reads the record is also the one who created it by comparing the active PFUser.currentUser with the user from your shift.
//Initial safe
var user = PFUser.currentUser
var relation = user.relationForKey("shifts")
relation.addObject(yourShiftObject)
user.saveInBackground()
You can set the ACL on objects when you create them. The best would be to define a default ACL that allows the creating user to read and write the object while still allowing public read access.
Example taken from the documentation
var defaultACL = PFACL.ACL()
// Optionally enable public read access while disabling public write access.
defaultACL.setPublicReadAccess(true)
PFACL.setDefaultACL(defaultACL, withAccessForCurrentUser:true)
https://www.parse.com/docs/ios_guide#security-recommendations/iOS
For example, I've created in Flash CS a movie clip CampfireMC, which contains child movie clip:
m_fire:FireMC
FireMC is an animation of flame
CampfireMC controls playback of m_fire, for example, last frame of CampfireMC uses action code:
m_fire.gotoAndStop(m_fire.totalFrames)
And the question is how to replace (not delete/add, as m_fire.gotoAndStop(m_fire.totalFrames) will not work in this case) FireMC to another animation FireMC2?
I've tried the following trick, but it doesn't work
var campfire:CampfireMC = new CampfireMC();
campfire.m_fire = new FireMC2();
campfire.gotoAndPlay(0)
not sure if the concept of "replacing" actually exists in Actionscript. changing the reference of m_fire would actually delete the previous reference and add a new one. this is what you do when you assign a new FireMC2 object to the m_fire variable, you delete the previous FireMC instance and add a new FireMC2 object.
the description of your problem seems to suggest that FireMC2 shares some functionality with FireMC , also I wonder if you shouldn't tackle the problem differently. instead of trying to replace one with the other , isn't it possible to encapsulate the extra functionality in a new MovieClip or even a new FireMC method and either add the new MovieClip or call the method , instead of trying to replace FireMC