public override void AddElement(ASceneElement element)
{
// 按屏幕坐标系方向组织顺序
int index = elementCoordinates.AddSorted(GetOneDCoordinate(element.Position));
elements.Insert(index, element);
}
/// <summary>
/// 回收一个场景元素实例到对象池。
/// </summary>
/// <param name="element">场景元素实例。</param>
public static void Delete(ASceneElement element)
{
Type type = element.GetType();
freeDic[type].Push(element);
element.Reset();
}
/// <summary>
/// 获取 prefab 中 Sprite 在卷轴方向上的长度。
/// </summary>
/// <param name="element"></param>
/// <returns>长度，单位 unit。</returns>
private float GetElementSpriteLength(ASceneElement element)
{
float prefabLen;
Transform prefab = element.Prefab;
if (!prefabLengthDic.TryGetValue(prefab, out prefabLen))
{
SpriteRenderer renderer = prefab.GetComponent <SpriteRenderer>();
Assert.IsNotNull(renderer);
Assert.IsNotNull(renderer.sprite);
Vector3 spriteSize = renderer.sprite.bounds.size;
prefabLen = ScrollAxis == ScrollAxis.Horizontal
? spriteSize.x * prefab.localScale.x
: spriteSize.y * prefab.localScale.y;
prefabLengthDic.Add(prefab, prefabLen);
}
float relativeScale = ScrollAxis == ScrollAxis.Horizontal
? element.RelativeScale.x
: element.RelativeScale.y;
return(prefabLen * relativeScale);
}
protected override float JoinElement(ASceneElement element, float distance, bool isPositive)
{
float elementSpriteLen = GetElementSpriteLength(element);
float sign = isPositive ? 1 : -1;
Vector3 elementPos;
if (ScrollAxis == ScrollAxis.Horizontal)
{
elementPos =
new Vector3(LayerCamera.StartPosition.x + distance + sign * elementSpriteLen * 0.5f,
0,
0);
}
else
{
elementPos =
new Vector3(0,
LayerCamera.StartPosition.y + distance + sign * elementSpriteLen * 0.5f,
0);
}
element.SetPosition(elementPos);
return(distance + sign * elementSpriteLen);
}
public override void Modify(ASceneElement element)
{
if (Mathf.Approximately(minRelativeScale, maxRelativeScale))
{
element.SetRelativeScale(minRelativeScale * Vector3.one);
}
else
{
element.SetRelativeScale(Random.Range(minRelativeScale, maxRelativeScale) * Vector3.one);
}
}
/// <summary>
/// 创建一个场景元素。
/// </summary>
/// <param name="isPositive">是否向正方向创建。</param>
/// <param name="element">创建的场景元素。</param>
/// <param name="filledDistance">当前填充的距离。</param>
/// <returns>是否成功创建。</returns>
private bool SpawnOneElement(bool isPositive, out ASceneElement element, ref float filledDistance)
{
element = GetProvider(filledDistance, isPositive).GetNext();
if (element == null)
{
return(false);
}
Assert.IsNotNull(element.Prefab);
filledDistance = JoinElement(element, filledDistance, isPositive);
return(true);
}
protected override float JoinElement(ASceneElement element, float distance, bool isPositive)
{
distance += GetNextInterval() * (isPositive ? 1 : -1);
if (ScrollAxis == ScrollAxis.Horizontal)
{
element.SetPosition(new Vector3(LayerCamera.StartPosition.x + distance, 0, 0));
}
else
{
element.SetPosition(new Vector3(0, LayerCamera.StartPosition.x + distance, 0));
}
return(distance);
}
public override void Modify(ASceneElement element)
{
Vector3 elementPos;
if (scrollAxis == ScrollAxis.Horizontal)
{
elementPos =
new Vector3(element.Position.x, sidePosition, element.Position.z);
}
else
{
elementPos =
new Vector3(sidePosition, element.Position.y, element.Position.z);
}
element.SetPosition(elementPos);
}
/// <summary> /// 将新场景元素添加到卷轴中。 /// </summary> /// <param name="element">新场景元素。</param> /// <param name="distance">当前已填充的距离。</param> /// <param name="isPositive">是否正向填充。</param> abstract protected float JoinElement(ASceneElement element, float distance, bool isPositive);
/// <summary>
/// 沿反方形生成下一个场景元素。
/// </summary>
/// <param name="element">场景元素。</param>
/// <param name="filledDistance">填充距离。</param>
/// <returns>是否成功生成场景元素。</returns>
public bool SpawnOneNegativeElement(out ASceneElement element, ref float filledDistance)
{
return(SpawnOneElement(false, out element, ref filledDistance));
}
/// <summary>
/// 沿正方形生成下一个场景元素。
/// </summary>
/// <param name="element">场景元素。</param>
/// <param name="filledDistance">填充距离。</param>
/// <returns>是否成功生成场景元素。</returns>
public bool SpawnOnePositiveElement(out ASceneElement element, ref float filledDistance)
{
return(SpawnOneElement(true, out element, ref filledDistance));
}
/// <summary> /// 添加一个场景元素。 /// </summary> /// <param name="element">场景元素。</param> abstract public void AddElement(ASceneElement element);
abstract public void Modify(ASceneElement element);