//根据贴图数组来创建合并好的贴图图集
private static Texture2D CreateAtlasMaxRect(TextureData[] textureDatas)
{
Array.Sort <TextureData>(textureDatas, new Texture2DComparison()); //读贴图数据进行排序
Texture2D atlas = new Texture2D(ATLAS_MAX_SIZE, ATLAS_MAX_SIZE); //创建Texture2D图集,按照最大尺寸
MaxRectsBinPack.PackTextures(atlas, GetPackTextures(textureDatas)); //将贴图数据(每个sprite)填充进atlas图集
return(atlas);
}
/// 向高度增长空间
private static Rect[] CalcByGrowHeight(Texture2D[] textures, ref int maxWidth, ref int maxHeight)
{
bool successed = true;
Rect[] aryRects = new Rect[textures.Length];
while (true)
{
MaxRectsBinPack packer = new MaxRectsBinPack(maxWidth, maxHeight, false);
for (int i = 0; i < textures.Length; ++i)
{
Texture2D tex = textures[i];
Rect rect = packer.Insert(tex.width, tex.height, FreeRectChoiceHeuristic.RectBestAreaFit);
aryRects[i] = rect;
if (rect.width == 0 || rect.height == 0)
{
//不通过
successed = false;
break;
}
if (i == textures.Length - 1)
{
successed = true;
}
}
if (successed)
{
break;
}
//先往高度发展，如果发现高度大于1024，则向宽度发展
if (maxHeight >= ATLAS_MAX_SIZE && maxWidth < ATLAS_MAX_SIZE)
{
//不允许超过2048
maxWidth *= 2;
}
else if (maxHeight >= FAVOR_ATLAS_SIZE && maxWidth < FAVOR_ATLAS_SIZE)
{
//尽量不能超过1024
maxWidth *= 2;
}
else if (maxHeight >= maxWidth * 2)
{
//尽量使宽和高之间的比例不要相差太大，防止IOS上会扩展成更大的正方形
maxWidth *= 2;
}
else
{
maxHeight *= 2;
}
aryRects = new Rect[textures.Length];
}
return(aryRects);
}