How do I create a method that adds a new sprite to the game?

Question

I want to have a script in my game that adds a card.

I am using a Card class for all my cards, so I don't have to make a prefab for each card. Instead I can do something like: Card fire = new Card("blah blah"); to define a "fire" card type, then call fire.Generate(position) to create a card sprite of that type at the given position.

Somehow I need my Generate() method to add a new object (sprite) to the game when called. How can I do that?

CardGenerator.cs:

using System.Collections; using System.Collections.Generic; using UnityEngine; public class CardGenerator : MonoBehaviour { Card makeYellow; private void Start() { makeYellow = new Card("Make Yellow", "This card makes the player yellow."); makeYellow.Generate(Vector2.zero); } }

Card.cs:

using System.Collections; using System.Collections.Generic; using UnityEngine; public class Card { public string Name; public string Description; private Sprite sprite; private SpriteRenderer sr; public Card(string name, string description) { Name = name; Description = description; } public void Generate(Vector2 pos) { // ... } }

DMGregory · Accepted Answer · 2021-11-28 22:01:51Z

public SpriteRenderer Generate(Vector2 pos) { // Add a new game object named after this card to the Active Scene. var card = new GameObject(Name); // Attach a SpriteRenderer component to this object. var spriteRenderer = card.AddComponent<SpriteRenderer>(); // Assign the sprite you want the card to display. spriteRenderer.sprite = sprite; // Position the card where you want it to appear. card.transform.position = pos; // Return a reference to this object in case other code wants to manipulate it. return spriteRenderer; }

There are legitimate reasons why someone would prefer to construct certain objects in code rather than create a prefab for each one, so I think this is still a valid way to do things, if somewhat unconventional as a Unity idiom. — DMGregory
– DMGregory ♦, Commented Nov 29, 2021 at 12:04

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