/// <summary>
/// 计算单项位置
/// </summary>
/// <param name="param_"></param>
/// <param name="index"></param>
/// <param name="matchPivot_">匹配中点</param>
/// <returns></returns>
public static Vector2 CalcItemPos(LayoutParam param_, int index_, bool matchPivot_ = true, LayoutItem item_ = null)
{
Vector2 pos = new Vector2(param_.origin.x, param_.origin.y);
Vector2 itemSize = param_.itemSize;
int divNum = param_.divNum; //每行 / 列的个数
if (param_.dir == LayoutDirection.TopToBottom)
{
//垂直
pos.x = pos.x + param_.padding.left + (index_ % divNum) * (itemSize.x + param_.itemGap.x);
pos.y = pos.y - param_.padding.top - Mathf.Floor(index_ / divNum) * (itemSize.y + param_.itemGap.y); //参考系是左上
}
else
{
pos.x = pos.x + param_.padding.left + Mathf.Floor(index_ / divNum) * (itemSize.x + param_.itemGap.x);
pos.y = pos.y - param_.padding.top - (index_ % divNum) * (itemSize.y + param_.itemGap.y); //参考系是左上
}
if (item_ != null)
{
item_.rect.Set(pos.x, pos.y, itemSize.x, itemSize.y);
item_.rect.y -= itemSize.y; //Y轴映射为右下坐标系
}
//不匹配中心的话, pos是左上角的点
if (matchPivot_)
{
if (!param_.pivot.Equals(LayoutParam.PIVOT_DEFAULT))
{
//中点不是默认的, 要折算一下
pos.x = pos.x + (param_.pivot.x - LayoutParam.PIVOT_DEFAULT.x) * itemSize.x;
pos.y = pos.y + (param_.pivot.y - LayoutParam.PIVOT_DEFAULT.y) * itemSize.y;
}
}
if (item_ != null)
{
item_.pos.Set(pos.x, pos.y);
if (matchPivot_)
{
item_.pivot.Set(param_.pivot.x, param_.pivot.y);
}
else
{
item_.pivot.Set(LayoutParam.PIVOT_DEFAULT.x, LayoutParam.PIVOT_DEFAULT.y);
}
}
return(pos);
}