From 62624e630b66a3fe7e3315d23159cca954e7f212 Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Sun, 3 Mar 2019 16:05:17 -0500
Subject: add line clear delay

---
 cetris.c     | 25 +++++++++++++++----------
 cetris.h     |  2 ++
 ncurses_ui.c | 15 ++++++++++-----
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/cetris.c b/cetris.c
index 3b4bfd6..13cb3c5 100644
--- a/cetris.c
+++ b/cetris.c
@@ -297,28 +297,33 @@ void set_constants(struct cetris_game* g) {
   }
 }
 
+void reset_slot(slot* s) {
+  s->occupied = 0;
+  s->constant = 0;
+  s->remove_tick = 0;
+}
+
 void wipe_board(struct cetris_game* g) {
   int lines_cleared = 0;
   for (int y = 0; y < BOARD_Y; y++) {
     int clear_line = 1;
 
     for (int x = 0; x < BOARD_X; x++) {
-      if (!g->board[x][y].constant) g->board[x][y].occupied = 0;
-      if (!g->board[x][y].occupied) clear_line = 0;
+      if (!g->board[x][y].constant) reset_slot(&g->board[x][y]);
+      if (g->board[x][y].remove_tick && g->board[x][y].remove_tick <= g->tick) {
+        reset_slot(&g->board[x][y]);
+        for (int s = y - 1; s >= 0; s--) {
+          g->board[x][s + 1] = g->board[x][s];
+        }
+      }
+      if (!g->board[x][y].occupied || g->board[x][y].remove_tick > 0) clear_line = 0;
     }
 
     if (clear_line) {
       lines_cleared++;
 
       for (int x = 0; x < BOARD_X; x++) {
-        g->board[x][y].occupied = 0;
-        g->board[x][y].constant = 0;
-      }
-
-      for (int s = y - 1; s >= 0; s--) {
-        for (int x = 0; x < BOARD_X; x++) {
-          g->board[x][s + 1] = g->board[x][s];
-        }
+        g->board[x][y].remove_tick = g->tick + CETRIS_LINE_CLEAR_DELAY;
       }
     }
   }
diff --git a/cetris.h b/cetris.h
index 2f7631b..926227f 100644
--- a/cetris.h
+++ b/cetris.h
@@ -4,6 +4,7 @@
 #define CETRIS_HZ 60
 #define CETRIS_DAS_DELAY 11
 #define CETRIS_DAS_PERIOD 5
+#define CETRIS_LINE_CLEAR_DELAY 40
 
 typedef struct {
   int x;
@@ -25,6 +26,7 @@ struct tetrimino {
 typedef struct {
   int occupied;
   int constant;
+  int remove_tick;
 } slot;
 
 enum movements {
diff --git a/ncurses_ui.c b/ncurses_ui.c
index 2a8a2b3..0f5af4e 100644
--- a/ncurses_ui.c
+++ b/ncurses_ui.c
@@ -37,9 +37,7 @@ void curses_init() {
   noecho();
   keypad(stdscr, TRUE);
   curs_set(0);
-  timeout(1000 / 60);
-
-  //resize_term(20, 50);
+  timeout(1000 / CETRIS_HZ);
 
   start_color();
   init_pair(0, COLOR_MAGENTA, COLOR_BLACK);
@@ -53,8 +51,15 @@ void draw_board(struct cetris_game* g) {
   mvaddstr(0, 0, PLAY_FIELD_STR);
   for (int x = 0; x < BOARD_X; x++) {
     for (int y = 0; y < BOARD_Y; y++) {
-      if (g->board[x][y].occupied) 
-        mvaddstr(y + 1, x * 2 + X_OFFSET, BLOCK);
+      if (g->board[x][y].occupied) {
+        if (g->board[x][y].remove_tick > 0) {
+          if (g->tick % 2 == 0) {
+            mvaddstr(y + 1, x * 2 + X_OFFSET, BLOCK);
+          }
+        } else {
+          mvaddstr(y + 1, x * 2 + X_OFFSET, BLOCK);
+        }
+      }
     }
   }
 }
-- 
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