private void CalculateElementPacking()
{
int elementCount = elements.Count;
//use the min area of all the elements to start with a sensible estimated size for the atlas to be
int minArea = 0;
for (int e = 0; e < elementCount; e++)
{
minArea += elements[e].expandedWidth * elements[e].expandedHeight;
}
int tryWidth = 16;
int tryHeight = 16;
int tries = 0;
while ((tryWidth - link.padding) * (tryHeight - link.padding) < minArea && tries++ < 100)
{
if (tries % 2 == 0) //alternate increasing width and height until we find a size that fits everything
{
tryWidth *= 2;
}
else
{
tryHeight *= 2;
}
}
tries = 0;
//subtract padding because we can't pack right up to the padded border
//but don't subtract padding*2 because the element sizes already account for padding on one side
PRPacker packer = new PRPacker(tryWidth - link.padding, tryHeight - link.padding);
while (tries++ < 100) //tries is to prevent infinite loops
{
bool didFail = false;
for (int e = 0; e < elementCount; e++)
{
PRAtlasElement element = elements[e];
//Debug.Log("Try fitting " + element.expandedWidth + ", " + element.expandedHeight + " into " + tryWidth+","+tryHeight);
//TODO update
PRRect rect = packer.Insert(element.expandedWidth, element.expandedHeight, PRPacker.ChoiceHeuristic.ShortSideFit);
if (rect.width == 0 && rect.height == 0) //both at 0 means it failed
{
didFail = true;
if (tryWidth <= tryHeight) //alternate increasing width and height until we find a size that fits everything
{
tryWidth *= 2;
}
else
{
tryHeight *= 2;
}
packer.Init(tryWidth - link.padding, tryHeight - link.padding);
break;
}
else
{
element.packedRect = rect;
element.packedRect.x += element.padding; //push the rect off the wall (note, y doesn't need this for the reason below)
//flip packing y coord. This is because the algorithm tries to pack everything around 0,0
//and we want 0,0 to be top left instead of bottom left (which it would be with Unity's coord system)
//there's no real reason for it to be top left, except that it's what people are used to.
element.packedRect.y = (tryHeight - element.packedRect.y) - element.packedRect.height;
}
}
if (!didFail)
{
atlasWidth = tryWidth;
atlasHeight = tryHeight;
break; //we're done!
}
}
}
private void CalculateElementPacking()
{
int elementCount = elements.Count;
//use the min area of all the elements to start with a sensible estimated size for the atlas to be
int minArea = 0;
for(int e = 0; e<elementCount; e++)
{
minArea += elements[e].expandedWidth * elements[e].expandedHeight;
}
int tryWidth = 16;
int tryHeight = 16;
int tries = 0;
while((tryWidth-link.padding)*(tryHeight-link.padding) < minArea && tries++ < 100)
{
if(tries % 2 == 0) //alternate increasing width and height until we find a size that fits everything
{
tryWidth *= 2;
}
else
{
tryHeight *= 2;
}
}
tries = 0;
//subtract padding because we can't pack right up to the padded border
//but don't subtract padding*2 because the element sizes already account for padding on one side
PRPacker packer = new PRPacker(tryWidth-link.padding,tryHeight-link.padding);
while(tries++ < 100) //tries is to prevent infinite loops
{
bool didFail = false;
for(int e = 0; e<elementCount; e++)
{
PRAtlasElement element = elements[e];
//Debug.Log("Try fitting " + element.expandedWidth + ", " + element.expandedHeight + " into " + tryWidth+","+tryHeight);
//TODO update
PRRect rect = packer.Insert(element.expandedWidth,element.expandedHeight, PRPacker.ChoiceHeuristic.ShortSideFit);
if(rect.width == 0 && rect.height == 0) //both at 0 means it failed
{
didFail = true;
if(tryWidth <= tryHeight) //alternate increasing width and height until we find a size that fits everything
{
tryWidth *= 2;
}
else
{
tryHeight *= 2;
}
packer.Init(tryWidth-link.padding,tryHeight-link.padding);
break;
}
else
{
element.packedRect = rect;
element.packedRect.x += element.padding; //push the rect off the wall (note, y doesn't need this for the reason below)
//flip packing y coord. This is because the algorithm tries to pack everything around 0,0
//and we want 0,0 to be top left instead of bottom left (which it would be with Unity's coord system)
//there's no real reason for it to be top left, except that it's what people are used to.
element.packedRect.y = (tryHeight - element.packedRect.y) - element.packedRect.height;
}
}
if(!didFail)
{
atlasWidth = tryWidth;
atlasHeight = tryHeight;
break; //we're done!
}
}
}
