You can also use the cursor keys to move around the grid squares.
Pressing Return does the same as clicking with the left button, while
-pressing Space does the same as a right button click.
+pressing Space does the same as a right button click. Moving with the
+cursor keys while holding Shift will place dots in all squares that
+are moved through.
(All the actions described in \k{common-actions} are also available.)
enum {none, forwards, backwards, hint};
int const w = state->params.w, h = state->params.h;
int r = ui->r, c = ui->c, action = none, cell;
+ int shift = button & MOD_SHFT;
+ button &= ~shift;
if (IS_CURSOR_SELECT(button) && !ui->cursor_show) return NULL;
int i;
for (i = 0; i < 4 && cursors[i] != button; ++i);
assert (i < 4);
- if (!out_of_bounds(ui->r + dr[i], ui->c + dc[i], w, h)) {
+ if (shift) {
+ int pre_r = r, pre_c = c, do_pre, do_post;
+ cell = state->grid[idx(r, c, state->params.w)];
+ do_pre = (cell == EMPTY);
+
+ if (out_of_bounds(ui->r + dr[i], ui->c + dc[i], w, h)) {
+ if (do_pre)
+ return nfmtstr(40, "W,%d,%d", pre_r, pre_c);
+ else
+ return NULL;
+ }
+
+ ui->r += dr[i];
+ ui->c += dc[i];
+
+ cell = state->grid[idx(ui->r, ui->c, state->params.w)];
+ do_post = (cell == EMPTY);
+
+ /* (do_pre ? "..." : "") concat (do_post ? "..." : "") */
+ if (do_pre && do_post)
+ return nfmtstr(80, "W,%d,%dW,%d,%d",
+ pre_r, pre_c, ui->r, ui->c);
+ else if (do_pre)
+ return nfmtstr(40, "W,%d,%d", pre_r, pre_c);
+ else if (do_post)
+ return nfmtstr(40, "W,%d,%d", ui->r, ui->c);
+ else
+ return "";
+
+ } else if (!out_of_bounds(ui->r + dr[i], ui->c + dc[i], w, h)) {
ui->r += dr[i];
ui->c += dc[i];
}