diff options
| -rw-r--r-- | untangle.c | 18 |
1 files changed, 9 insertions, 9 deletions
@@ -1159,18 +1159,18 @@ static void place_dragged_point(const game_state *state, game_ui *ui, */ int d = state->params.n - 1; + /* Calculate position in terms of the snapping grid. */ x = d * x / (state->w * ds->tilesize); - x *= (state->w * ds->tilesize) / d; - x += (state->w * ds->tilesize) / (2*d); - y = d * y / (state->h * ds->tilesize); - y *= (state->h * ds->tilesize) / d; - y += (state->h * ds->tilesize) / (2*d); + /* Convert to standard co-ordinates, applying a half-square offset. */ + ui->newpoint.x = (x * 2 + 1) * state->w; + ui->newpoint.y = (y * 2 + 1) * state->h; + ui->newpoint.d = d * 2; + } else { + ui->newpoint.x = x; + ui->newpoint.y = y; + ui->newpoint.d = ds->tilesize; } - - ui->newpoint.x = x; - ui->newpoint.y = y; - ui->newpoint.d = ds->tilesize; } static char *interpret_move(const game_state *state, game_ui *ui, |