koobas.hobune.stream
instantiating elements in UI/Canvas
Hey guys. Basically all i need to do is randomly spawn sprites that fall across the screen on the screen space overlay canvas. Instantiate needs a vector 3 as a position, but the canvas does not have a vector3 position just a rect transform. So either need to instantiate using rect transform (which doesnt seem like it woul dbe possible) or get the equivelent postion in the UI using a vector. Hope that makes sense.
Something like this
GameObject randomGerm = germs[Random.Range(0, germs.Length)];
Vector3 spawnPosition = new Vector3(Random.Range(-spawnValues.x, spawnValues.x) ,spawnValues.y,spawnValues.z);
Quaternion spawnRotation = Quaternion.identity; //new Quaternion ();
GameObject germSpawned = Instantiate (randomGerm, spawnPosition, spawnRotation) as GameObject;
But this will only spawn in world space not the UI/Canvas.. hope you know what im aiming at
thanks guys
The important thing is to parent the newly instantiated object to the canvas.
You can also instantiate the object using the single parameter version of Object.Instantiate():
public static Object Instantiate(Object original);
and then modify the transform of the returned object:
GameObject germSpawned = Instantiate(randomGerm) as GameObject;
germSpawned.transform.SetParent(canvas.transform);
germSpawned.transform.localPosition = spawnPosition;
germSpawned.transform.localRotation = spawnRotation;
Hey there.. Well germs is an array of gameObjects (the images have empty gameobjects as parents for animation purposes). Where do i set the parent? before setting the rectTransform components? Also that is still using Vector 3s, as spawnPostiin is a Vector3 and i cant use a vector3 to place a UI image in screen space.
Does the GameObject you are cloning have a plain old Transform or a RectTransform? Either can be used to set the position in the Canvas, but the interface will be slightly different for each. However, you will set the parent the same way:
germSpawned.transform.SetParent(canvasObject.transform);
Using the Transform component, you can set the X,Y values of the position; they should be relative to the center of the canvas. If the game object has a RectTransform (or you replace the transform with a RectTransform using AddComponent), then you can set the anchoredPosition and it will use the behavior as deter$$anonymous$$ed by the anchor$$anonymous$$in/anchor$$anonymous$$ax/pivot values.
You could rewrite those 4 lines as:
GameObject germSpawned = Instantiate(randomGerm, spawnPosition, spawnRotation) as GameObject;
germSpawned.transform.SetParent(canvas.transform);
but either way works just as well ;)
