diff --git a/src/game/g_grid.pas b/src/game/g_grid.pas
index 900a3661d90c49ccec2363d6e9e6814b71164b75..56d8ecbc42bbebf2ac1c9075c588b5725f68f227 100644 (file)
--- a/src/game/g_grid.pas
+++ b/src/game/g_grid.pas
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
-{$MODE DELPHI}
-{$modeswitch nestedprocvars}
+// universal spatial grid
+{$INCLUDE ../shared/a_modes.inc}
unit g_grid;
interface
-uses e_log;
-
const
GridDefaultTileSize = 32;
type
TBodyGrid = class;
- TBodyProxy = class(TObject)
+ TBodyProxy = Integer;
+
+ PBodyProxyRec = ^TBodyProxyRec;
+ TBodyProxyRec = record
private
mX, mY, mWidth, mHeight: Integer; // aabb
mQueryMark: DWord; // was this object visited at this query?
mObj: TObject;
- mGrid: TBodyGrid;
+ //mGrid: TBodyGrid;
mTag: Integer;
- prevLink: TBodyProxy; // only for used
- nextLink: TBodyProxy; // either used or free
+ nextLink: TBodyProxy; // next free or nothing
private
procedure setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
public
- constructor Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
- destructor Destroy (); override;
+ //constructor Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+ //destructor Destroy (); override;
property x: Integer read mX;
property y: Integer read mY;
property height: Integer read mHeight;
property obj: TObject read mObj;
property tag: Integer read mTag;
- property grid: TBodyGrid read mGrid;
+ //property grid: TBodyGrid read mGrid;
end;
PGridCell = ^TGridCell;
TGridCell = record
- body: TBodyProxy;
+ body: Integer;
next: Integer; // in this cell; index in mCells
end;
+ GridInternalCB = function (grida: Integer): Boolean is nested; // return `true` to stop
+
TBodyGrid = class(TObject)
private
mTileSize: Integer;
+ mMinX, mMinY: Integer; // so grids can start at any origin
mWidth, mHeight: Integer; // in tiles
mGrid: array of Integer; // mWidth*mHeight, index in mCells
mCells: array of TGridCell; // cell pool
mFreeCell: Integer; // first free cell index or -1
- mLastQuery: Integer;
+ mLastQuery: DWord;
mUsedCells: Integer;
+ mProxies: array of TBodyProxyRec;
mProxyFree: TBodyProxy; // free
- mProxyList: TBodyProxy; // used
- mProxyCount: Integer; // total allocated
+ mProxyCount: Integer; // currently used
+ mProxyMaxCount: Integer;
private
function allocCell: Integer;
procedure insert (body: TBodyProxy);
procedure remove (body: TBodyProxy);
+ function forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
+
public
- constructor Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+ constructor Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
destructor Destroy (); override;
function insertBody (aObj: TObject; ax, ay, aWidth, aHeight: Integer; aTag: Integer=0): TBodyProxy;
- procedure removeBody (aObj: TBodyProxy); // WARNING! this will NOT destroy proxy!
+ procedure removeBody (aObj: TBodyProxy); // WARNING! this WILL destroy proxy!
procedure moveBody (body: TBodyProxy; dx, dy: Integer);
procedure resizeBody (body: TBodyProxy; sx, sy: Integer);
end;
-type
- TBinaryHeapLessFn = function (a, b: TObject): Boolean;
-
- TBinaryHeapObj = class(TObject)
- private
- elem: array of TObject;
- elemUsed: Integer;
- lessfn: TBinaryHeapLessFn;
-
- private
- procedure heapify (root: Integer);
-
- public
- constructor Create (alessfn: TBinaryHeapLessFn);
- destructor Destroy (); override;
-
- procedure clear ();
-
- procedure insert (val: TObject);
-
- function front (): TObject;
- procedure popFront ();
-
- property count: Integer read elemUsed;
- end;
-
-
implementation
uses
- SysUtils;
+ SysUtils, e_log;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyProxy.Create (aGrid: TBodyGrid; aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
-begin
- mGrid := aGrid;
- setup(aX, aY, aWidth, aHeight, aObj, aTag);
-end;
-
-
-destructor TBodyProxy.Destroy ();
-begin
- inherited;
-end;
-
-
-procedure TBodyProxy.setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
+procedure TBodyProxyRec.setup (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer);
begin
mX := aX;
mY := aY;
mQueryMark := 0;
mObj := aObj;
mTag := aTag;
- prevLink := nil;
- nextLink := nil;
+ nextLink := -1;
end;
// ////////////////////////////////////////////////////////////////////////// //
-constructor TBodyGrid.Create (aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
+constructor TBodyGrid.Create (aMinPixX, aMinPixY, aPixWidth, aPixHeight: Integer; aTileSize: Integer=GridDefaultTileSize);
var
idx: Integer;
begin
if aPixWidth < aTileSize then aPixWidth := aTileSize;
if aPixHeight < aTileSize then aPixHeight := aTileSize;
mTileSize := aTileSize;
+ mMinX := aMinPixX;
+ mMinY := aMinPixY;
mWidth := (aPixWidth+aTileSize-1) div aTileSize;
mHeight := (aPixHeight+aTileSize-1) div aTileSize;
SetLength(mGrid, mWidth*mHeight);
SetLength(mCells, mWidth*mHeight);
+ SetLength(mProxies, 8192);
mFreeCell := 0;
// init free list
for idx := 0 to High(mCells) do
begin
- mCells[idx].body := nil;
+ mCells[idx].body := -1;
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
// init grid
for idx := 0 to High(mGrid) do mGrid[idx] := -1;
+ // init proxies
+ for idx := 0 to High(mProxies) do mProxies[idx].nextLink := idx+1;
+ mProxies[High(mProxies)].nextLink := -1;
mLastQuery := 0;
mUsedCells := 0;
- mProxyFree := nil;
- mProxyList := nil;
+ mProxyFree := 0;
mProxyCount := 0;
+ mProxyMaxCount := 0;
e_WriteLog(Format('created grid with size: %dx%d (tile size: %d); pix: %dx%d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize]), MSG_NOTIFY);
end;
destructor TBodyGrid.Destroy ();
-var
- px: TBodyProxy;
begin
- // free all owned proxies
- while mProxyFree <> nil do
- begin
- px := mProxyFree;
- mProxyFree := px.nextLink;
- px.Free();
- end;
-
- while mProxyList <> nil do
- begin
- px := mProxyList;
- mProxyList := px.nextLink;
- px.Free();
- end;
-
mCells := nil;
mGrid := nil;
+ mProxies := nil;
inherited;
end;
end;
if (mcb < cnt) then mcb := cnt;
end;
- e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodies in cell: %d; proxies allocated: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyCount]), MSG_NOTIFY);
+ e_WriteLog(Format('grid size: %dx%d (tile size: %d); pix: %dx%d; used cells: %d; max bodies in cell: %d; max proxies allocated: %d; proxies used: %d', [mWidth, mHeight, mTileSize, mWidth*mTileSize, mHeight*mTileSize, mUsedCells, mcb, mProxyMaxCount, mProxyCount]), MSG_NOTIFY);
end;
SetLength(mCells, mFreeCell+32768); // arbitrary number
for idx := mFreeCell to High(mCells) do
begin
- mCells[idx].body := nil;
+ mCells[idx].body := -1;
mCells[idx].next := idx+1;
end;
mCells[High(mCells)].next := -1; // last cell
begin
if (idx >= 0) and (idx < High(mCells)) then
begin
- if mCells[idx].body = nil then exit; // the thing that should not be
- mCells[idx].body := nil;
+ if mCells[idx].body = -1 then exit; // the thing that should not be
+ mCells[idx].body := -1;
mCells[idx].next := mFreeCell;
mFreeCell := idx;
Dec(mUsedCells);
function TBodyGrid.allocProxy (aX, aY, aWidth, aHeight: Integer; aObj: TObject; aTag: Integer): TBodyProxy;
+var
+ olen, idx: Integer;
+ px: PBodyProxyRec;
begin
- if (mProxyFree = nil) then
+ if (mProxyFree = -1) then
begin
- // no free proxies, create new
- result := TBodyProxy.Create(self, aX, aY, aWidth, aHeight, aObj, aTag);
- Inc(mProxyCount);
- end
- else
- begin
- // get one from list
- result := mProxyFree;
- mProxyFree := result.nextLink;
- result.setup(aX, aY, aWidth, aHeight, aObj, aTag);
+ // no free proxies, resize list
+ olen := Length(mProxies);
+ SetLength(mProxies, olen+8192); // arbitrary number
+ for idx := olen to High(mProxies) do mProxies[idx].nextLink := idx+1;
+ mProxies[High(mProxies)].nextLink := -1;
+ mProxyFree := olen;
end;
+ // get one from list
+ result := mProxyFree;
+ px := @mProxies[result];
+ mProxyFree := px.nextLink;
+ px.setup(aX, aY, aWidth, aHeight, aObj, aTag);
// add to used list
- result.nextLink := mProxyList;
- if (mProxyList <> nil) then mProxyList.prevLink := result;
- mProxyList := result;
+ px.nextLink := -1;
+ // statistics
+ Inc(mProxyCount);
+ if (mProxyMaxCount < mProxyCount) then mProxyMaxCount := mProxyCount;
end;
procedure TBodyGrid.freeProxy (body: TBodyProxy);
begin
- if body = nil then exit; // just in case
- // remove from used list
- if (body.prevLink = nil) then
- begin
- // this must be head
- if (body <> mProxyList) then raise Exception.Create('wutafuuuuu in grid?');
- mProxyList := body.nextLink;
- end
- else
- begin
- body.prevLink.nextLink := body.nextLink;
- end;
- if (body.nextLink <> nil) then body.nextLink.prevLink := body.prevLink;
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ if (mProxyCount = 0) then raise Exception.Create('wutafuuuuu in grid (no allocated proxies, what i should free now?)');
// add to free list
- //body.mObj := nil; //WARNING! DON'T DO THIS! `removeBody()` depends on valid mObj
- body.prevLink := nil;
- body.nextLink := mProxyFree;
+ mProxies[body].mObj := nil;
+ mProxies[body].nextLink := mProxyFree;
mProxyFree := body;
+ Dec(mProxyCount);
end;
-procedure TBodyGrid.insert (body: TBodyProxy);
+function TBodyGrid.forGridRect (x, y, w, h: Integer; cb: GridInternalCB): Boolean;
var
- dx, dy, gx, gy, cidx: Integer;
+ gx, gy: Integer;
begin
- if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- //e_WriteLog(Format('grid: inserting body: (%d,%d)-(%dx%d)', [body.mX, body.mY, body.mWidth, body.mHeight]), MSG_NOTIFY);
- gy := body.mY div mTileSize;
- dy := 0;
- while (dy < body.mHeight) do
+ result := false;
+ if (w < 1) or (h < 1) or not assigned(cb) then exit;
+ // fix coords
+ Dec(x, mMinX);
+ Dec(y, mMinY);
+ // go on
+ if (x+w <= 0) or (y+h <= 0) then exit;
+ if (x >= mWidth*mTileSize) or (y >= mHeight*mTileSize) then exit;
+ for gy := y div mTileSize to (y+h-1) div mTileSize do
begin
- if (gy >= 0) and (gy < mHeight) then
+ if (gy < 0) then continue;
+ if (gy >= mHeight) then break;
+ for gx := x div mTileSize to (x+w-1) div mTileSize do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
- begin
- if (gx >= 0) and (gx < mWidth) then
- begin
- //e_WriteLog(Format(' 00: allocating cell for grid coords (%d,%d), body coords:(%d,%d)', [gx, gy, dx, dy]), MSG_NOTIFY);
- cidx := allocCell();
- //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- mCells[cidx].body := body;
- mCells[cidx].next := mGrid[gy*mWidth+gx];
- mGrid[gy*mWidth+gx] := cidx;
- //e_WriteLog(Format(' 02: put cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
- end;
- Inc(dx, mTileSize);
- Inc(gx);
- end;
+ if (gx < 0) then continue;
+ if (gx >= mWidth) then break;
+ if (cb(gy*mWidth+gx)) then begin result := true; exit; end;
end;
- Inc(dy, mTileSize);
- Inc(gy);
end;
end;
-// absolutely not tested
-procedure TBodyGrid.remove (body: TBodyProxy);
+procedure TBodyGrid.insert (body: TBodyProxy);
+
+ function inserter (grida: Integer): Boolean;
+ var
+ cidx: Integer;
+ begin
+ result := false; // never stop
+ // add body to the given grid cell
+ cidx := allocCell();
+ //e_WriteLog(Format(' 01: allocated cell for grid coords (%d,%d), body coords:(%d,%d): #%d', [gx, gy, dx, dy, cidx]), MSG_NOTIFY);
+ mCells[cidx].body := body;
+ mCells[cidx].next := mGrid[grida];
+ mGrid[grida] := cidx;
+ end;
+
var
- dx, dy, gx, gy, idx, pidx, tmp: Integer;
+ px: PBodyProxyRec;
begin
- if body = nil then exit;
- if (body.mWidth < 1) or (body.mHeight < 1) then exit;
- // out of grid?
- if (body.mX+body.mWidth <= 0) or (body.mY+body.mHeight <= 0) then exit;
- if (body.mX >= mWidth*mTileSize) or (body.mY >= mHeight*mTileSize) then exit;
- gy := body.mY div mTileSize;
- dy := 0;
- pidx := -1;
- while (dy < body.mHeight) do
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ px := @mProxies[body];
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, inserter);
+end;
+
+
+// absolutely not tested
+procedure TBodyGrid.remove (body: TBodyProxy);
+
+ function remover (grida: Integer): Boolean;
+ var
+ pidx, idx, tmp: Integer;
begin
- if (gy >= 0) and (gy < mHeight) then
+ result := false; // never stop
+ // find and remove cell
+ pidx := -1;
+ idx := mGrid[grida];
+ while idx >= 0 do
begin
- dx := 0;
- gx := body.mX div mTileSize;
- while (dx < body.mWidth) do
+ tmp := mCells[idx].next;
+ if (mCells[idx].body = body) then
begin
- if (gx >= 0) and (gx < mWidth) then
- begin
- // find and remove cell
- pidx := -1;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
- begin
- tmp := mCells[idx].next;
- if mCells[idx].body = body then
- begin
- if pidx = -1 then mGrid[gy*mWidth+gx] := tmp else mCells[pidx].next := tmp;
- freeCell(idx);
- end
- else
- begin
- pidx := idx;
- end;
- idx := tmp;
- end;
- end;
- Inc(dx, mTileSize);
- Inc(gx);
+ if (pidx = -1) then mGrid[grida] := tmp else mCells[pidx].next := tmp;
+ freeCell(idx);
+ break; // assume that we cannot have one object added to bucket twice
+ end
+ else
+ begin
+ pidx := idx;
end;
+ idx := tmp;
end;
- Inc(dy, mTileSize);
- Inc(gy);
end;
+
+var
+ px: PBodyProxyRec;
+begin
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ px := @mProxies[body];
+ forGridRect(px.mX, px.mY, px.mWidth, px.mHeight, remover);
end;
end;
-// WARNING! this will NOT destroy proxy!
procedure TBodyGrid.removeBody (aObj: TBodyProxy);
begin
- if aObj = nil then exit;
- if (aObj.mGrid <> self) then raise Exception.Create('trying to remove alien proxy from grid');
+ if (aObj < 0) or (aObj > High(mProxies)) then exit; // just in case
removeBody(aObj);
- //HACK!
freeProxy(aObj);
- if (mProxyFree <> aObj) then raise Exception.Create('grid deletion invariant fucked');
- mProxyFree := aObj.nextLink;
- aObj.nextLink := nil;
end;
procedure TBodyGrid.moveResizeBody (body: TBodyProxy; dx, dy, sx, sy: Integer);
+var
+ px: PBodyProxyRec;
begin
- if (body = nil) or ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
+ if (body < 0) or (body > High(mProxies)) then exit; // just in case
+ if ((dx = 0) and (dy = 0) and (sx = 0) and (sy = 0)) then exit;
remove(body);
- Inc(body.mX, dx);
- Inc(body.mY, dy);
- Inc(body.mWidth, sx);
- Inc(body.mHeight, sy);
+ px := @mProxies[body];
+ Inc(px.mX, dx);
+ Inc(px.mY, dy);
+ Inc(px.mWidth, sx);
+ Inc(px.mHeight, sy);
insert(body);
end;
function TBodyGrid.forEachInAABB (x, y, w, h: Integer; cb: GridQueryCB): Boolean;
-var
- gx, gy, idx: Integer;
- minx, miny, maxx, maxy: Integer;
-begin
- result := false;
- if not assigned(cb) then exit;
- if (w < 1) or (h < 1) then exit;
- minx := x;
- miny := y;
- maxx := x+w-1;
- maxy := y+h-1;
- if (minx > maxx) or (miny > maxy) then exit;
- if (maxx < 0) or (maxy < 0) then exit;
- if (minx >= mWidth*mTileSize) or (miny >= mHeight*mTileSize) then exit;
- // increase query counter
- Inc(mLastQuery);
- if (mLastQuery = 0) then
- begin
- // just in case of overflow
- mLastQuery := 1;
- for idx := 0 to High(mCells) do if (mCells[idx].body <> nil) then mCells[idx].body.mQueryMark := 0;
- end;
- //e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
- // process grid
- for gy := miny div mTileSize to maxy div mTileSize do
+ function iterator (grida: Integer): Boolean;
+ var
+ idx: Integer;
+ px: PBodyProxyRec;
begin
- if (gy < 0) then continue;
- if (gy >= mHeight) then break;
- for gx := minx div mTileSize to maxx div mTileSize do
+ result := false;
+ idx := mGrid[grida];
+ while (idx >= 0) do
begin
- if (gx < 0) then continue;
- if (gx >= mWidth) then break;
- idx := mGrid[gy*mWidth+gx];
- while idx >= 0 do
+ if (mCells[idx].body <> -1) then
begin
- if (mCells[idx].body <> nil) and (mCells[idx].body.mQueryMark <> mLastQuery) then
+ px := @mProxies[mCells[idx].body];
+ if (px.mQueryMark <> mLastQuery) then
begin
//e_WriteLog(Format(' query #%d body hit: (%d,%d)-(%dx%d) tag:%d', [mLastQuery, mCells[idx].body.mX, mCells[idx].body.mY, mCells[idx].body.mWidth, mCells[idx].body.mHeight, mCells[idx].body.mTag]), MSG_NOTIFY);
- mCells[idx].body.mQueryMark := mLastQuery;
- if (cb(mCells[idx].body.mObj, mCells[idx].body.mTag)) then begin result := true; exit; end;
+ px.mQueryMark := mLastQuery;
+ if (cb(px.mObj, px.mTag)) then begin result := true; exit; end;
end;
- idx := mCells[idx].next;
end;
+ idx := mCells[idx].next;
end;
end;
-end;
+var
+ idx: Integer;
+begin
+ result := false;
+ if not assigned(cb) then exit;
-function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
-
- function qq (obj: TObject; tag: Integer): Boolean;
+ // increase query counter
+ Inc(mLastQuery);
+ if (mLastQuery = 0) then
begin
- result := (obj = aObj);
+ // just in case of overflow
+ mLastQuery := 1;
+ for idx := 0 to High(mProxies) do mProxies[idx].mQueryMark := 0;
end;
+ //e_WriteLog(Format('grid: query #%d: (%d,%d)-(%dx%d)', [mLastQuery, minx, miny, maxx, maxy]), MSG_NOTIFY);
-begin
- result := nil;
- forEachInAABB(x, y, w, h, qq);
-end;
-
-
-// ////////////////////////////////////////////////////////////////////////// //
-constructor TBinaryHeapObj.Create (alessfn: TBinaryHeapLessFn);
-begin
- if not assigned(alessfn) then raise Exception.Create('wutafuck?!');
- lessfn := alessfn;
- SetLength(elem, 8192); // 'cause why not?
- elemUsed := 0;
-end;
-
-
-destructor TBinaryHeapObj.Destroy ();
-begin
- inherited;
-end;
-
-
-procedure TBinaryHeapObj.clear ();
-begin
- elemUsed := 0;
+ result := forGridRect(x, y, w, h, iterator);
end;
-procedure TBinaryHeapObj.heapify (root: Integer);
+function TBodyGrid.getProxyForBody (aObj: TObject; x, y, w, h: Integer): TBodyProxy;
var
- smallest, right: Integer;
- tmp: TObject;
-begin
- while true do
- begin
- smallest := 2*root+1; // left child
- if (smallest >= elemUsed) then break; // anyway
- right := smallest+1; // right child
- if not lessfn(elem[smallest], elem[root]) then smallest := root;
- if (right < elemUsed) and (lessfn(elem[right], elem[smallest])) then smallest := right;
- if (smallest = root) then break;
- // swap
- tmp := elem[root];
- elem[root] := elem[smallest];
- elem[smallest] := tmp;
- root := smallest;
- end;
-end;
+ res: TBodyProxy = -1;
-
-procedure TBinaryHeapObj.insert (val: TObject);
-var
- i, par: Integer;
-begin
- if (val = nil) then exit;
- i := elemUsed;
- if (i = Length(elem)) then SetLength(elem, Length(elem)+16384); // arbitrary number
- Inc(elemUsed);
- while (i <> 0) do
+ function iterator (grida: Integer): Boolean;
+ var
+ idx: Integer;
begin
- par := (i-1) div 2; // parent
- if not lessfn(val, elem[par]) then break;
- elem[i] := elem[par];
- i := par;
+ result := false;
+ idx := mGrid[grida];
+ while idx >= 0 do
+ begin
+ if (mCells[idx].body <> -1) and (mProxies[mCells[idx].body].mObj = aObj) then
+ begin
+ result := true;
+ res := mCells[idx].body;
+ exit;
+ end;
+ idx := mCells[idx].next;
+ end;
end;
- elem[i] := val;
-end;
-
-function TBinaryHeapObj.front (): TObject;
-begin
- if elemUsed > 0 then result := elem[0] else result := nil;
-end;
-
-procedure TBinaryHeapObj.popFront ();
begin
- if (elemUsed > 0) then
- begin
- Dec(elemUsed);
- elem[0] := elem[elemUsed];
- heapify(0);
- end;
+ result := -1;
+ if (aObj = nil) then exit;
+ forGridRect(x, y, w, h, iterator);
+ result := res;
end;