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QUESTION
I've been struggling with this all over my react-native app, so I set up a very simple example of it in codesandbox which you can view here:
https://codesandbox.io/s/elastic-star-5754q?file=/src/App.js
Within the View with the green background, all of the internal views are centered horizontally within their respective spaces as I would expect thanks to the "alignItems: center" style property. I would expect that I could also center them vertically within their spaces by setting "justifyContent: center", but that doesn't seem to work for me.
Am I fundamentally misunderstanding something?
...ANSWER
Answered 2021-Jun-15 at 21:59The problem is that you are not aligning the text within the individual Views. Your example mistakenly aligns the inner View elements within the larger View element rather than aligning the text.
To center-align the text vertically within their Views you just need to add justifyContent: "center"
to those individual three green Views.
Here's an example: https://codesandbox.io/s/recursing-kirch-n8one?file=/src/App.js:393-417
To further explain why you were experiencing the issue you did, see this screenshot with boxes outlining the space the elements were taking up on-screen:
You can see the inner View
s are only taking up the needed width of the text
elements inside, but are using the max height available to them.
QUESTION
I'm trying to create an app that meets two random users in Django. my question is how to create an object Meeting out of 2 random users from my User model, I want something like a for loop so that every 2 users in my database have a meeting!
ps: I have only one day left to submit my work I will be so thankful if u help me
this is my code so far:
...ANSWER
Answered 2021-Jun-15 at 21:48I can't decipher what you're doing there, but:
QUESTION
Sorry if this is a noob question!
I have two tables - a movie and a comment table.
I am trying to return output of the movie name and each comment for that movie as long as that movie has more than 1 comment associated to it.
Here are my tables
...ANSWER
Answered 2021-Jun-15 at 20:19Something like this could work
QUESTION
I'm trying to change the following code so I get this output for radius 2:
...ANSWER
Answered 2021-Mar-21 at 01:38The output looks oval because characters have not same width and height. Think of an image that its pixels are not square, but vertical rectangles. I borrowed the c# version of the code linked by @Prasanth Rajendran, and made some modifications:
- added
lineWidth
argument - added
xScale
argument, now every1/xScale
characters in a row are equivalent to1
data points - moved character position to its center, by adding a [0.5, 0.5] offset
QUESTION
I am currently creating class diagrams in UML for a movie test domain. I would like to know if I am doing it right. Well, I have two alternatives (the first version in the first picture, the second in the second - I think the first one is better). I'm wondering if I've established the so-called "relationship owner" correctly, that is, from which class to which direction the relationships go. I also don't know if I didn't get multiplicity wrong (one to one, one to many etc.).
So on my domain I would like to have movies of course, the actors starring in those movies and directors. I wonder if the class name "Character" is good in this case, because I mean all the characters that take part in a movie - it can be director, actor but also for example "Batman". Maybe I should make a distinction here between "Movie Character" and then "Human", "Monster", whatever. But I don't know how to do it elegantly, will I then inherit from the Character class? I'm also wondering if I shouldn't put classes like City or Country together in one class called Address - but I wanted the classes to take attributes like in this case, that one is Master and the other is detail - and the relationship set in the right direction. I use only relations such as Inheritance and Dependency, I do not know if I should change something in this case.
Version 1
Version 2
Thanks in advance for any suggestions or advice!
...ANSWER
Answered 2021-Jun-15 at 11:58Use inheritance very carefully. Prefer association over inheritance whenever your inheritance is not a permanent truth from the birth to the death of an object. ANd keep in mind that dependencies between classes do not make any promises about objects of those classes.
Some more explanationsSome clarifications on the UML syntax:
- I understand that your plain thick lines ended with a small hollow triangle represent a specialization/generalization relationship (aka inheritance). If this is correct, the triangle should be larger to avoid visual confusion. Moreover multiplicity makes no sense with inheritance and should be removed.
- I understand that with the dotted line you intend to represent an association with multiplicity. If this is correct:
- the association should be plain lines, because dotted lines are for dependencies, and multiplicity would make no sense.
- the meaning you give to the arrow head would be unclear. Do you use them to document navigability? In case of doubt, remove them. If you want to document ownership of the association end, use the dot notation instead. (we cannot say if it’s right or wrong, since it’s a decision on how your model sees the associations)
In view of your comments and the third model linked therein, there are some key UML semantics you need to keep in mind:
- Inheritance is an ultra-strong relationship which means "is (always) a". In your example, you may say that an
Actor
is always aPerson
, and hence, everything you say about aPerson
is also true for anActor
. By the way, you should avoid repeating inherited properties or methods, since it could create some ambiguity. - Inheritance is not a substitute for aggregation, composition or association. You can for example not say that a
CrewMember
(one person) is always aCrew
(a group of persons). ACrewMember
belongs to aCrew
but there are things that the crew can do together that the individual member can't. - Inheritance is not suitable if it's not always true. A
Character
for example may often be aPerson
. But not always;: you can have ghost characters, comic characters, robot characters, or animals. - Association means that there is some structural relation between some instances of the associated classes. For example, that one ore several persons live in one city, seems a very relevant assocaition.
- Dependency means that a class is dependent on another, i.e. without the other class it would not work or something would be missing. It's a statement about the classes and not the objects. I.e. If you meant to say that
Person
is dependent onCity
you just say that the class Person would not work without knowing about City (for example, because the operationsendPostCardFrom(city: City)
needs an argument of that type) but you do not say anything about persons X, Y and Z. If you want that X, Y and Z are related to city a, b, and c, you need an association.
About the model content, I'll not decide for you and there is no single truth. I therefore prefer to draw your attention at potential issues. I raise them in form of a question, up-to you to adjust the model based on your own answer:
Common issues between the both variants:
- Are
Actor
andDirector
reallyPersons
? In this case, what with the Persons that are Actors and Directors at the same time (g.g. Clint Eastwood) ? Or areActor
andDirector
just roles that aPersons
takes for a givenMovie
? - Is a
Character
really related only to 1Movie
? What to do with Indiana Jones, where the same character appears in several movies? - In a similar way, I wonder if there's really a single
Person
who lives in aCity
or if this should not be a many-to-many association?
- Are
Issues regarding the differences: `
- Is a
Person
in version 1 aCharacter
(inheritance) ? Or is aCharacter
a representation of aPerson
(association: represents) ? - Is a
Character
in version 2 really anActor
and by transitivity also aPerson
(inheritance)? Or is theCharacter
only associated with anActor
(association: plays) ?
- Is a
It's up to you to decide, but wherever I asked a question about association or inheritance, you should better think twice before using inheritance (i.e. prefer association/composition over inheritance)
QUESTION
I need to filter hotels by multiple conditions: stars (multiple choice), type (multiple choice), price(range with two ends), country (one of the list). I tried to do that like that:
...ANSWER
Answered 2021-Jun-14 at 14:26Hey everyone who reads this message! I have found the solution here:
https://gist.github.com/jherax/f11d669ba286f21b7a2dcff69621eb72
It's highly likely that you will find it there too if you are brought here by the same question as above.
QUESTION
I'm very new to python and don't know how to proceed. I have a csv file with over 100k rows in following structure:
...ANSWER
Answered 2021-Jun-14 at 13:45Split genres on |
, explode
it, groupby
genres, and use agg
as size
for title and mean
for rating.
QUESTION
This piece of code giving me type error: "TypeError: Cannot read property 'map' of undefined" I don't understand what is the problem here.
...ANSWER
Answered 2021-Jun-14 at 07:07I added?.
before map:
QUESTION
I'm working on a 2D game in Unity and am using the A* Pathfinding Package from Aron Granberg.
Everything appears to be working fine. AIPaths are being generated and AI Agents are navigating from point to point and avoiding obstacles as expected. It's fine except for one thing.
The position.z
of the AI Agent is incorrect.
The spawn origin of the AI Agent has a z of 0, and the target point has a z of 0, yet the AI Agent's z fluctuates between -9 and -1 as it traverses the path. The path itself appears to have a z position of 0 at each waypoint.
I haven't modified the code in the package at all and just followed the documentation when setting it up for 2D.
Any ideas what could be causing this?
NOTE: I haven't included a screenshot of it, but the prefab that is being spawned in as the AI Agent has a transform position of (0,0,0).
The A-star pathfinder object:
The AI Agent object (note that the Z pos is not 0):
The spawn point object that sets the spawn for the AI agent:
The destination target object that the AI Agent is heading to:
...ANSWER
Answered 2021-Jun-14 at 02:09In case anyone else runs into this problem.
The fix was to add a Rigidbody2D to my AI Agent and set the gravity scale to 0.
Even though my game doesn't use Unity's physics system for movement and the Astar package can move AI agents by transform, for some reason it requires a Rigidbody to keep the Z position at 0.
I'm still not really sure why this solves the problem because, when I was debugging the third-party Astar code, it always returned nextPosition values with a Z position of 0 yet the actual position that the AI Agent was updated to had varying Z positions...
If you have more info, leave a comment and I'll add it to the answer.
QUESTION
Using semantic ui ,
Initialize the prop at father component : isFavorite = false
can't catch the value after clickig at icon , how i fill the star to diff color (by add attribute?
styleColor={isFavorite : color:"red" : color:"white"
})
component.js const ProductDetails = () => {
...ANSWER
Answered 2021-Jun-13 at 21:41Try the following:
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