private void Start()
{
Vector2 canvasSize = rectTransform.rect.size;
for (int i = 0; i < initialMolecules; ++i)
{
BackgroundMolecule molecule = Instantiate(moleculePrefabs[rng.Next(moleculePrefabs.Length)], rectTransform);
var moleculeTransform = molecule.GetComponent <RectTransform>();
moleculeTransform.anchoredPosition = new Vector2((float)rng.NextDouble(), (float)rng.NextDouble()) * canvasSize;
float direction = (float)rng.NextDouble() * Mathf.PI * 2;
molecule.Direction = new Vector2(Mathf.Cos(direction), Mathf.Sin(direction));
}
}
private void Update()
{
if (Time.time - lastSpawnTime < spawnRate)
{
return;
}
Vector2 canvasSize = rectTransform.rect.size;
BackgroundMolecule molecule = Instantiate(moleculePrefabs[rng.Next(moleculePrefabs.Length)], rectTransform);
float spawnLocationAlongBorder = (float)(rng.NextDouble() * 2 * (canvasSize.x + canvasSize.y));
Vector2 spawnPosition;
float direction;
if (spawnLocationAlongBorder < canvasSize.x)
{
spawnPosition = new Vector2(spawnLocationAlongBorder, -spawnOffset);
direction = (float)rng.NextDouble() * 90 + 45;
}
else if (spawnLocationAlongBorder < canvasSize.x + canvasSize.y)
{
spawnPosition = new Vector2(canvasSize.x + spawnOffset, spawnLocationAlongBorder - canvasSize.x);
direction = (float)rng.NextDouble() * 90 + 135;
}
else if (spawnLocationAlongBorder < 2 * canvasSize.x + canvasSize.y)
{
spawnPosition = new Vector2(spawnLocationAlongBorder - canvasSize.x - canvasSize.y, canvasSize.y + spawnOffset);
direction = (float)rng.NextDouble() * 90 + 225;
}
else
{
spawnPosition = new Vector2(-spawnOffset, spawnLocationAlongBorder - 2 * canvasSize.x - canvasSize.y);
direction = (float)rng.NextDouble() * 90 + 315;
}
var moleculeTransform = molecule.GetComponent <RectTransform>();
moleculeTransform.anchoredPosition = spawnPosition;
molecule.Direction = new Vector2(Mathf.Cos(direction * Mathf.Deg2Rad), Mathf.Sin(direction * Mathf.Deg2Rad));
lastSpawnTime = Time.time;
}