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GOB: Format getDirection() to be more readable

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svn-id: r53789
This commit is contained in:
Sven Hesse 2010-10-25 03:37:48 +00:00
parent d751212eb3
commit 029aee61a6
1 changed files with 78 additions and 46 deletions
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124
engines/gob/map.cpp
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@ -91,14 +91,17 @@ enum {
};
int16 Map::getDirection(int16 x0, int16 y0, int16 x1, int16 y1) {
int16 dir = 0;
if ((x0 == x1) && (y0 == y1))
// Already at the destination
return 0;
if ((x1 < 0) || (x1 > _mapWidth) || (y1 < 0) || (y1 > _mapHeight))
// Destination out of range
return 0;
int16 dir = 0;
// Find the direct direction we want to move
if (y1 > y0)
dir |= kDown;
else if (y1 < y0)
@ -109,123 +112,152 @@ int16 Map::getDirection(int16 x0, int16 y0, int16 x1, int16 y1) {
else if (x1 < x0)
dir |= kLeft;
if ((getPass(x0, y0) == 3) && (dir & kUp)) {
if ((getPass(x0, y0 - 1) != 0))
return kDirN;
}
if ((getPass(x0, y0) == 3) && (dir & kDown)) {
if ((getPass(x0, y0 + 1) != 0))
return kDirS;
}
// Are we on ladders and can continue the ladder in the wanted direction?
if ((getPass(x0, y0) == 3) && (dir & kUp ) && (getPass(x0, y0 - 1) != 0))
return kDirN;
if ((getPass(x0, y0) == 6) && (dir & kUp)) {
if ((getPass(x0, y0 - 1) != 0))
return kDirN;
}
if ((getPass(x0, y0) == 3) && (dir & kDown) && (getPass(x0, y0 + 1) != 0))
return kDirS;
if ((getPass(x0, y0) == 6) && (dir & kDown)) {
if ((getPass(x0, y0 + 1) != 0))
return kDirS;
}
if ((getPass(x0, y0) == 6) && (dir & kUp ) && (getPass(x0, y0 - 1) != 0))
return kDirN;
if ((getPass(x0, y0) == 6) && (dir & kDown) && (getPass(x0, y0 + 1) != 0))
return kDirS;
// Want to go left
if (dir == kLeft) {
if (((x0 - 1) >= 0) && (getPass(x0 - 1, y0) != 0))
if (getPass(x0 - 1, y0) != 0)
// Can go west
return kDirW;
// Can't go
return 0;
}
// Want to go left
if (dir == kRight) {
if (((x0 + 1) < _mapWidth) && (getPass(x0 + 1, y0) != 0))
if (getPass(x0 + 1, y0) != 0)
// Can go east
return kDirE;
// Can't go
return 0;
}
// Want to go up
if (dir == kUp) {
if (((y0 - 1) >= 0) && (getPass(x0, y0 - 1) != 0))
if (getPass(x0 , y0 - 1) != 0)
// Can go north
return kDirN;
if (((y0 - 1) >= 0) && ((x0 - 1) >= 0) &&
(getPass(x0 - 1, y0 - 1) != 0))
if (getPass(x0 - 1, y0 - 1) != 0)
// Can up north-west instead
return kDirNW;
if (((y0 - 1) >= 0) && ((x0 + 1) < _mapWidth) &&
(getPass(x0 + 1, y0 - 1) != 0))
if (getPass(x0 + 1, y0 - 1) != 0)
// Can up north-east instead
return kDirNE;
// Can't go at all
return 0;
}
// Want to go down
if (dir == kDown) {
if (((y0 + 1) < _mapHeight) && (getPass(x0, y0 + 1) != 0))
if (getPass(x0 , y0 + 1) != 0)
// Can go south
return kDirS;
if (((y0 + 1) < _mapHeight) && ((x0 - 1) >= 0) &&
(getPass(x0 - 1, y0 + 1) != 0))
if (getPass(x0 - 1, y0 + 1) != 0)
// Can up south-west instead
return kDirSW;
if (((y0 + 1) < _mapHeight) && ((x0 + 1) < _mapWidth) &&
(getPass(x0 + 1, y0 + 1) != 0))
if (getPass(x0 + 1, y0 + 1) != 0)
// Can up south-east instead
return kDirSE;
// Can't go at all
return 0;
}
// Want to go up and right
if (dir == (kRight | kUp)) {
if (((y0 - 1) >= 0) && ((x0 + 1) < _mapWidth) &&
(getPass(x0 + 1, y0 - 1) != 0))
if (getPass(x0 + 1, y0 - 1) != 0)
// Can go north-east
return kDirNE;
if (((y0 - 1) >= 0) && (getPass(x0, y0 - 1) != 0))
if (getPass(x0 , y0 - 1) != 0)
// Can only go north
return kDirN;
if (((x0 + 1) < _mapWidth) && (getPass(x0 + 1, y0) != 0))
if (getPass(x0 + 1, y0 ) != 0)
// Can only go east
return kDirE;
// Can't go at all
return 0;
}
// Want to go down and right
if (dir == (kRight | kDown)) {
if (((x0 + 1) < _mapWidth) && ((y0 + 1) < _mapHeight) &&
(getPass(x0 + 1, y0 + 1) != 0))
if (getPass(x0 + 1, y0 + 1) != 0)
// Can go south-east
return kDirSE;
if (((y0 + 1) < _mapHeight) && (getPass(x0, y0 + 1) != 0))
if (getPass(x0 , y0 + 1) != 0)
// Can only go south
return kDirS;
if (((x0 + 1) < _mapWidth) && (getPass(x0 + 1, y0) != 0))
if (getPass(x0 + 1, y0 ) != 0)
// Can only go east
return kDirE;
// Can't go at all
return 0;
}
// Want to go up and left
if (dir == (kLeft | kUp)) {
if (((x0 - 1) >= 0) && ((y0 - 1) >= 0) &&
(getPass(x0 - 1, y0 - 1) != 0))
if (getPass(x0 - 1, y0 - 1) != 0)
// Can go north-west
return kDirNW;
if (((y0 - 1) >= 0) && (getPass(x0, y0 - 1) != 0))
if (getPass(x0 , y0 - 1) != 0)
// Can only go north
return kDirN;
if (((x0 - 1) >= 0) && (getPass(x0 - 1, y0) != 0))
if (getPass(x0 - 1, y0 ) != 0)
// Can only go west
return kDirW;
// Can't go at all
return 0;
}
// Want to go left and down
if (dir == (kLeft | kDown)) {
if (((x0 - 1) >= 0) && ((y0 + 1) < _mapHeight) &&
(getPass(x0 - 1, y0 + 1) != 0))
if (getPass(x0 - 1, y0 + 1) != 0)
// Can go south-west
return kDirSW;
if (((y0 + 1) < _mapHeight) && (getPass(x0, y0 + 1) != 0))
if (getPass(x0 , y0 + 1) != 0)
// Can only go south
return kDirS;
if (((x0 - 1) >= 0) && (getPass(x0 - 1, y0) != 0))
if (getPass(x0 - 1, y0 ) != 0)
// Can only go west
return kDirW;
// Can't go at all
return 0;
}
warning("Map::getDirection(): Invalid direction?!?");
return -1;
}