ImRect ScoreRect(int width, int height, FreeRectChoiceHeuristic method, ref int score1, ref int score2)
{
ImRect newNode = new ImRect();
score1 = int.MaxValue;
score2 = int.MaxValue;
switch (method)
{
case FreeRectChoiceHeuristic.RectBestShortSideFit: newNode = FindPositionForNewNodeBestShortSideFit(width, height, ref score1, ref score2); break;
case FreeRectChoiceHeuristic.RectBottomLeftRule: newNode = FindPositionForNewNodeBottomLeft(width, height, ref score1, ref score2); break;
case FreeRectChoiceHeuristic.RectContactPointRule:
newNode = FindPositionForNewNodeContactPoint(width, height, ref score1);
score1 = -score1; // Reverse since we are minimizing, but for contact point score bigger is better.
break;
case FreeRectChoiceHeuristic.RectBestLongSideFit: newNode = FindPositionForNewNodeBestLongSideFit(width, height, ref score2, ref score1); break;
case FreeRectChoiceHeuristic.RectBestAreaFit: newNode = FindPositionForNewNodeBestAreaFit(width, height, ref score1, ref score2); break;
}
// Cannot fit the current rectangle.
if (newNode.height == 0)
{
score1 = int.MaxValue;
score2 = int.MaxValue;
}
return(newNode);
}
bool SplitFreeNode(ImRect freeNode, ref ImRect usedNode)
{
// Test with SAT if the rectangles even intersect.
if (usedNode.x >= freeNode.x + freeNode.width || usedNode.x + usedNode.width <= freeNode.x ||
usedNode.y >= freeNode.y + freeNode.height || usedNode.y + usedNode.height <= freeNode.y)
{
return(false);
}
if (usedNode.x < freeNode.x + freeNode.width && usedNode.x + usedNode.width > freeNode.x)
{
// New node at the top side of the used node.
if (usedNode.y > freeNode.y && usedNode.y < freeNode.y + freeNode.height)
{
ImRect newNode = freeNode;
newNode.height = usedNode.y - newNode.y;
freeRectangles.Add(newNode);
}
// New node at the bottom side of the used node.
if (usedNode.y + usedNode.height < freeNode.y + freeNode.height)
{
ImRect newNode = freeNode;
newNode.y = usedNode.y + usedNode.height;
newNode.height = freeNode.y + freeNode.height - (usedNode.y + usedNode.height);
freeRectangles.Add(newNode);
}
}
if (usedNode.y < freeNode.y + freeNode.height && usedNode.y + usedNode.height > freeNode.y)
{
// New node at the left side of the used node.
if (usedNode.x > freeNode.x && usedNode.x < freeNode.x + freeNode.width)
{
ImRect newNode = freeNode;
newNode.width = usedNode.x - newNode.x;
freeRectangles.Add(newNode);
}
// New node at the right side of the used node.
if (usedNode.x + usedNode.width < freeNode.x + freeNode.width)
{
ImRect newNode = freeNode;
newNode.x = usedNode.x + usedNode.width;
newNode.width = freeNode.x + freeNode.width - (usedNode.x + usedNode.width);
freeRectangles.Add(newNode);
}
}
return(true);
}
ImRect FindPositionForNewNodeBestAreaFit(int width, int height, ref int bestAreaFit, ref int bestShortSideFit)
{
ImRect bestNode = new ImRect();
//memset(&bestNode, 0, sizeof(ImRect));
bestAreaFit = int.MaxValue;
for (int i = 0; i < freeRectangles.Count; ++i)
{
int areaFit = (int)freeRectangles[i].width * (int)freeRectangles[i].height - width * height;
// Try to place the rectangle in upright (non-flipped) orientation.
if (freeRectangles[i].width >= width && freeRectangles[i].height >= height)
{
int leftoverHoriz = Math.Abs((int)freeRectangles[i].width - width);
int leftoverVert = Math.Abs((int)freeRectangles[i].height - height);
int shortSideFit = Math.Min(leftoverHoriz, leftoverVert);
if (areaFit < bestAreaFit || (areaFit == bestAreaFit && shortSideFit < bestShortSideFit))
{
bestNode.x = freeRectangles[i].x;
bestNode.y = freeRectangles[i].y;
bestNode.width = width;
bestNode.height = height;
bestShortSideFit = shortSideFit;
bestAreaFit = areaFit;
}
}
if (allowRotations && freeRectangles[i].width >= height && freeRectangles[i].height >= width)
{
int leftoverHoriz = Math.Abs((int)freeRectangles[i].width - height);
int leftoverVert = Math.Abs((int)freeRectangles[i].height - width);
int shortSideFit = Math.Min(leftoverHoriz, leftoverVert);
if (areaFit < bestAreaFit || (areaFit == bestAreaFit && shortSideFit < bestShortSideFit))
{
bestNode.x = freeRectangles[i].x;
bestNode.y = freeRectangles[i].y;
bestNode.width = height;
bestNode.height = width;
bestShortSideFit = shortSideFit;
bestAreaFit = areaFit;
}
}
}
return(bestNode);
}
public void Insert(List <ImRect> rects, List <ImRect> dst, FreeRectChoiceHeuristic method)
{
dst.Clear();
dst.AddRange(new ImRect[rects.Count]);
var remaining = rects.Count;
var completed = new bool[rects.Count];
while (remaining > 0)
{
int bestScore1 = int.MaxValue;
int bestScore2 = int.MaxValue;
int bestRectIndex = -1;
ImRect bestNode = new ImRect();
for (int i = 0; i < rects.Count; ++i)
{
if (!completed[i])
{
int score1 = 0;
int score2 = 0;
ImRect newNode = ScoreRect((int)rects[i].width, (int)rects[i].height, method, ref score1, ref score2);
if (score1 < bestScore1 || (score1 == bestScore1 && score2 < bestScore2))
{
bestScore1 = score1;
bestScore2 = score2;
bestNode = newNode;
bestRectIndex = i;
}
}
}
if (bestRectIndex == -1)
{
return;
}
PlaceRect(bestNode);
completed[bestRectIndex] = true;
dst[bestRectIndex] = bestNode;
remaining--;
//rects.RemoveAt(bestRectIndex);
}
}
public void Init(int width, int height, bool rotations = true)
{
binWidth = width;
binHeight = height;
allowRotations = rotations;
ImRect n = new ImRect();
n.x = 0;
n.y = 0;
n.width = width;
n.height = height;
usedRectangles.Clear();
freeRectangles.Clear();
freeRectangles.Add(n);
}
void PlaceRect(ImRect node)
{
int numRectanglesToProcess = freeRectangles.Count;
for (int i = 0; i < numRectanglesToProcess; ++i)
{
if (SplitFreeNode(freeRectangles[i], ref node))
{
freeRectangles.RemoveAt(i);
--i;
--numRectanglesToProcess;
}
}
PruneFreeList();
usedRectangles.Add(node);
}
public void Clip(ImRect clip)
{
if (Min.x < clip.Min.x)
{
Min.x = clip.Min.x;
}
if (Min.y < clip.Min.y)
{
Min.y = clip.Min.y;
}
if (Max.x > clip.Max.x)
{
Max.x = clip.Max.x;
}
if (Max.y > clip.Max.y)
{
Max.y = clip.Max.y;
}
}
public void Add(ImRect rhs)
{
if (Min.x > rhs.Min.x)
{
Min.x = rhs.Min.x;
}
if (Min.y > rhs.Min.y)
{
Min.y = rhs.Min.y;
}
if (Max.x < rhs.Max.x)
{
Max.x = rhs.Max.x;
}
if (Max.y < rhs.Max.y)
{
Max.y = rhs.Max.y;
}
}
public ImRect Insert(int width, int height, FreeRectChoiceHeuristic method)
{
ImRect newNode = new ImRect();
int score1 = 0; // Unused in this function. We don't need to know the score after finding the position.
int score2 = 0;
switch (method)
{
case FreeRectChoiceHeuristic.RectBestShortSideFit: newNode = FindPositionForNewNodeBestShortSideFit(width, height, ref score1, ref score2); break;
case FreeRectChoiceHeuristic.RectBottomLeftRule: newNode = FindPositionForNewNodeBottomLeft(width, height, ref score1, ref score2); break;
case FreeRectChoiceHeuristic.RectContactPointRule: newNode = FindPositionForNewNodeContactPoint(width, height, ref score1); break;
case FreeRectChoiceHeuristic.RectBestLongSideFit: newNode = FindPositionForNewNodeBestLongSideFit(width, height, ref score2, ref score1); break;
case FreeRectChoiceHeuristic.RectBestAreaFit: newNode = FindPositionForNewNodeBestAreaFit(width, height, ref score1, ref score2); break;
}
if (newNode.height == 0)
{
return(newNode);
}
int numRectanglesToProcess = freeRectangles.Count;
for (int i = 0; i < numRectanglesToProcess; ++i)
{
if (SplitFreeNode(freeRectangles[i], ref newNode))
{
freeRectangles.RemoveAt(i);
--i;
--numRectanglesToProcess;
}
}
PruneFreeList();
usedRectangles.Add(newNode);
return(newNode);
}
ImRect FindPositionForNewNodeBottomLeft(int width, int height, ref int bestY, ref int bestX)
{
ImRect bestNode = new ImRect();
//memset(bestNode, 0, sizeof(ImRect));
bestY = int.MaxValue;
for (int i = 0; i < freeRectangles.Count; ++i)
{
// Try to place the rectangle in upright (non-flipped) orientation.
if (freeRectangles[i].width >= width && freeRectangles[i].height >= height)
{
int topSideY = (int)freeRectangles[i].y + height;
if (topSideY < bestY || (topSideY == bestY && freeRectangles[i].x < bestX))
{
bestNode.x = freeRectangles[i].x;
bestNode.y = freeRectangles[i].y;
bestNode.width = width;
bestNode.height = height;
bestY = topSideY;
bestX = (int)freeRectangles[i].x;
}
}
if (allowRotations && freeRectangles[i].width >= height && freeRectangles[i].height >= width)
{
int topSideY = (int)freeRectangles[i].y + width;
if (topSideY < bestY || (topSideY == bestY && freeRectangles[i].x < bestX))
{
bestNode.x = freeRectangles[i].x;
bestNode.y = freeRectangles[i].y;
bestNode.width = height;
bestNode.height = width;
bestY = topSideY;
bestX = (int)freeRectangles[i].x;
}
}
}
return(bestNode);
}
ImRect FindPositionForNewNodeContactPoint(int width, int height, ref int bestContactScore)
{
ImRect bestNode = new ImRect();
//memset(&bestNode, 0, sizeof(ImRect));
bestContactScore = -1;
for (int i = 0; i < freeRectangles.Count; ++i)
{
// Try to place the rectangle in upright (non-flipped) orientation.
if (freeRectangles[i].width >= width && freeRectangles[i].height >= height)
{
int score = ContactPointScoreNode((int)freeRectangles[i].x, (int)freeRectangles[i].y, width, height);
if (score > bestContactScore)
{
bestNode.x = (int)freeRectangles[i].x;
bestNode.y = (int)freeRectangles[i].y;
bestNode.width = width;
bestNode.height = height;
bestContactScore = score;
}
}
if (allowRotations && freeRectangles[i].width >= height && freeRectangles[i].height >= width)
{
int score = ContactPointScoreNode((int)freeRectangles[i].x, (int)freeRectangles[i].y, height, width);
if (score > bestContactScore)
{
bestNode.x = (int)freeRectangles[i].x;
bestNode.y = (int)freeRectangles[i].y;
bestNode.width = height;
bestNode.height = width;
bestContactScore = score;
}
}
}
return(bestNode);
}
bool IsContainedIn(ImRect a, ImRect b)
{
return(a.x >= b.x && a.y >= b.y &&
a.x + a.width <= b.x + b.width &&
a.y + a.height <= b.y + b.height);
}
public bool Overlaps(ImRect r)
{
return(r.Min.y < Max.y && r.Max.y > Min.y && r.Min.x < Max.x && r.Max.x > Min.x);
}
public bool Contains(ImRect r)
{
return(r.Min.x >= Min.x && r.Min.y >= Min.y && r.Max.x < Max.x && r.Max.y < Max.y);
}