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(svn r21498) -Codechange: make the measurement tooltip handle diagonal selection properly

This commit is contained in:
rubidium 2010-12-13 15:11:03 +00:00
parent 959308a243
commit 652e262601
1 changed files with 31 additions and 2 deletions
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33
src/viewport.cpp
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@ -2723,7 +2723,36 @@ calc_heightdiff_single_direction:;
/* If dragging an area (eg dynamite tool) and it is actually a single
* row/column, change the type to 'line' to get proper calculation for height */
style = (HighLightStyle)_thd.next_drawstyle;
if (style & HT_RECT) {
if (IsDraggingDiagonal()) {
/* Determine the "area" of the diagonal dragged selection.
* We assume the area is the number of tiles along the X
* edge and the number of tiles along the Y edge. However,
* multiplying these two numbers does not give the exact
* number of tiles; basically we are counting the black
* squares on a chess board and ignore the white ones to
* make the tile counts at the edges match up. There is no
* other way to make a proper count though.
*
* First convert to the rotated coordinate system. */
int dist_x = TileX(t0) - TileX(t1);
int dist_y = TileY(t0) - TileY(t1);
int a_max = dist_x + dist_y;
int b_max = dist_y - dist_x;
/* Now determine the size along the edge, but due to the
* chess board principle this counts double. */
a_max = abs(a_max + (a_max > 0 ? 2 : -2)) / 2;
b_max = abs(b_max + (b_max > 0 ? 2 : -2)) / 2;
/* We get a 1x1 on normal 2x1 rectangles, due to it being
* a seen as two sides. As the result for actual building
* will be the same as non-diagonal dragging revert to that
* behaviour to give it a more normally looking size. */
if (a_max != 1 || b_max != 1) {
dx = a_max;
dy = b_max;
}
} else if (style & HT_RECT) {
if (dx == 1) {
style = HT_LINE | HT_DIR_Y;
} else if (dy == 1) {
@ -2731,7 +2760,7 @@ calc_heightdiff_single_direction:;
}
}
if (dx != 1 || dy != 1) {
if (t0 != 1 || t1 != 1) {
int heightdiff = CalcHeightdiff(style, 0, t0, t1);
params[index++] = dx;