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(svn r19765) -Codechange: Apply a bit of code style and a bit of comment shuffling to CalcHeightdiff.

This commit is contained in:
alberth 2010-05-07 20:20:03 +00:00
parent fa0ca116fe
commit 3bb174f424
1 changed files with 12 additions and 14 deletions
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26
src/viewport.cpp
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@ -2169,25 +2169,23 @@ static bool SwapDirection(HighLightStyle style, TileIndex start_tile, TileIndex
return false;
}
/** Calculates height difference between one tile and another
/** Calculates height difference between one tile and another.
* Multiplies the result to suit the standard given by minimap - 50 meters high
* To correctly get the height difference we need the direction we are dragging
* in, as well as with what kind of tool we are dragging. For example a horizontal
* autorail tool that starts in bottom and ends at the top of a tile will need the
* maximum of SW, S and SE, N corners respectively. This is handled by the lookup table below
* See _tileoffs_by_dir in map.c for the direction enums if you can't figure out
* the values yourself.
* @param style HightlightStyle of drag. This includes direction and style (autorail, rect, etc.)
* @param distance amount of tiles dragged, important for horizontal/vertical drags
* ignored for others
* @param start_tile, end_tile start and end tile of drag operation
* @return height difference between two tiles. Tile measurement tool utilizes
* this value in its tooltips */
* See #_tileoffs_by_dir in map.cpp for the direction enums if you can't figure out the values yourself.
* @param style Highlighting style of the drag. This includes direction and style (autorail, rect, etc.)
* @param distance Number of tiles dragged, important for horizontal/vertical drags, ignored for others.
* @param start_tile Start tile of the drag operation.
* @param end_tile End tile of the drag operation.
* @return Height difference between two tiles. The tile measurement tool utilizes this value in its tooltip.
*/
static int CalcHeightdiff(HighLightStyle style, uint distance, TileIndex start_tile, TileIndex end_tile)
{
bool swap = SwapDirection(style, start_tile, end_tile);
byte style_t;
uint h0, h1, ht; // start heigth, end height, and temp variable
uint h0, h1; // Start height and end height.
if (start_tile == end_tile) return 0;
if (swap) Swap(start_tile, end_tile);
@ -2201,7 +2199,7 @@ static int CalcHeightdiff(HighLightStyle style, uint distance, TileIndex start_t
/* In the case of an area we can determine whether we were dragging south or
* east by checking the X-coordinates of the tiles */
style_t = (byte)(TileX(end_tile) > TileX(start_tile));
byte style_t = (byte)(TileX(end_tile) > TileX(start_tile));
start_tile = TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_area_by_dir[style_t]));
end_tile = TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_area_by_dir[2 + style_t]));
}
@ -2234,10 +2232,10 @@ static int CalcHeightdiff(HighLightStyle style, uint distance, TileIndex start_t
if (swap && distance == 0) style = flip_style_direction[style];
/* Use lookup table for start-tile based on HighLightStyle direction */
style_t = style * 2;
byte style_t = style * 2;
assert(style_t < lengthof(heightdiff_line_by_dir) - 13);
h0 = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t])));
ht = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t + 1])));
uint ht = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t + 1])));
h0 = max(h0, ht);
/* Use lookup table for end-tile based on HighLightStyle direction