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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /** @file lineblockmap.h Specialized world map line blockmap. | ||
| * | ||
| * @authors Copyright © 2003-2013 Jaakko Keränen <jaakko.keranen@iki.fi> | ||
| * @authors Copyright © 2006-2013 Daniel Swanson <danij@dengine.net> | ||
| * | ||
| * @par License | ||
| * GPL: http://www.gnu.org/licenses/gpl.html | ||
| * | ||
| * <small>This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by the | ||
| * Free Software Foundation; either version 2 of the License, or (at your | ||
| * option) any later version. This program is distributed in the hope that it | ||
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty | ||
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | ||
| * Public License for more details. You should have received a copy of the GNU | ||
| * General Public License along with this program; if not, write to the Free | ||
| * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | ||
| * 02110-1301 USA</small> | ||
| */ | ||
|
|
||
| #ifndef DENG_WORLD_LINEBLOCKMAP_H | ||
| #define DENG_WORLD_LINEBLOCKMAP_H | ||
|
|
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| #include <QList> | ||
|
|
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| #include "world/blockmap.h" | ||
| #include "Line" | ||
|
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| /** | ||
| * Specializes Blockmap for use with map Lines, implementing a linkage algorithm | ||
| * that replicates the quirky behavior of doom.exe | ||
| * | ||
| * @ingroup world | ||
| */ | ||
| class LineBlockmap : public de::Blockmap | ||
| { | ||
| public: | ||
| LineBlockmap(AABoxd const &bounds, uint cellSize); | ||
|
|
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| /// @note Assumes @a line is not yet linked! | ||
| void link(Line &line); | ||
|
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| /// @note Assumes none of the specified @a lines are yet linked! | ||
| void link(QList<Line *> const &lines); | ||
| }; | ||
|
|
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| #endif // DENG_WORLD_LINEBLOCKMAP_H |
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| Original file line number | Diff line number | Diff line change |
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| /** @file lineblockmap.cpp Specialized world map line blockmap. | ||
| * | ||
| * @authors Copyright © 2003-2013 Jaakko Keränen <jaakko.keranen@iki.fi> | ||
| * @authors Copyright © 2006-2013 Daniel Swanson <danij@dengine.net> | ||
| * | ||
| * @par License | ||
| * GPL: http://www.gnu.org/licenses/gpl.html | ||
| * | ||
| * <small>This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by the | ||
| * Free Software Foundation; either version 2 of the License, or (at your | ||
| * option) any later version. This program is distributed in the hope that it | ||
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty | ||
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | ||
| * Public License for more details. You should have received a copy of the GNU | ||
| * General Public License along with this program; if not, write to the Free | ||
| * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | ||
| * 02110-1301 USA</small> | ||
| */ | ||
|
|
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| #include "world/lineblockmap.h" | ||
|
|
||
| using namespace de; | ||
|
|
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| LineBlockmap::LineBlockmap(AABoxd const &bounds, uint cellSize) | ||
| : Blockmap(bounds, Vector2ui(cellSize, cellSize)) | ||
| {} | ||
|
|
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| void LineBlockmap::link(Line &line) | ||
| { | ||
| // Polyobj lines are excluded (presently...). | ||
| if(line.definesPolyobj()) return; | ||
|
|
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| // Determine the block of cells we'll be working within. | ||
| BlockmapCellBlock const cellBlock = toCellBlock(line.aaBox()); | ||
| BlockmapCell cell; | ||
| for(cell.y = cellBlock.min.y; cell.y < cellBlock.max.y; ++cell.y) | ||
| for(cell.x = cellBlock.min.x; cell.x < cellBlock.max.x; ++cell.x) | ||
| { | ||
| if(line.slopeType() == ST_VERTICAL || line.slopeType() == ST_HORIZONTAL) | ||
| { | ||
| Blockmap::link(cell, &line); | ||
| continue; | ||
| } | ||
|
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| Vector2d const point(origin() + cellDimensions() * cell); | ||
|
|
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| // Choose a cell diagonal to test. | ||
| Vector2d from, to; | ||
| if(line.slopeType() == ST_POSITIVE) | ||
| { | ||
| // Line slope / vs \ cell diagonal. | ||
| from = Vector2d(point.x, point.y + cellDimensions().y); | ||
| to = Vector2d(point.x + cellDimensions().x, point.y); | ||
| } | ||
| else | ||
| { | ||
| // Line slope \ vs / cell diagonal. | ||
| from = Vector2d(point.x + cellDimensions().x, point.y + cellDimensions().y); | ||
| to = Vector2d(point.x, point.y); | ||
| } | ||
|
|
||
| // Would Line intersect this? | ||
| if((line.pointOnSide(from) < 0) != (line.pointOnSide(to) < 0)) | ||
| { | ||
| Blockmap::link(cell, &line); | ||
| } | ||
| } | ||
| } | ||
|
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| void LineBlockmap::link(QList<Line *> const &lines) | ||
| { | ||
| foreach(Line *line, lines) | ||
| { | ||
| link(*line); | ||
| } | ||
| } |
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