From 3aac2039d9343b670223b684e21122f6f29a9f1f Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Sun, 3 Mar 2019 18:06:31 -0500
Subject: add proper counterclockwise rotate support

---
 cetris.c | 14 +++++++++++---
 cetris.h |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/cetris.c b/cetris.c
index ed7f211..09474a4 100644
--- a/cetris.c
+++ b/cetris.c
@@ -16,6 +16,7 @@ void move_left(struct cetris_game* g);
 void move_right(struct cetris_game* g);
 void move_hard_drop(struct cetris_game* g);
 void rotate_clockwise(struct cetris_game* g);
+void rotate_counterclockwise(struct cetris_game* g);
 static void init_piece_queue(struct cetris_game* g);
 static void shuffle_queue(struct cetris_game* g);
 static void next_piece(struct cetris_game* g);
@@ -185,9 +186,12 @@ void rotate_matrix(struct cetris_game* g, int clockwise) {
   for (int x = 0; x < 4; x++) {
     for (int y = 0; y < 4; y++) {
       if (g->current.mat[y][x]) {
-        int new_x = 1 - (y - 2);
-        int new_y = 2 + (x - 1);
-        if (g->current.t == I) new_y--;
+        int new_x = (clockwise) ? 1 - (y - 2) : 1 + (y - 2);
+        int new_y = (clockwise) ? 2 + (x - 1) : 2 - (x - 1);
+        if (g->current.t == I) {
+          if (clockwise) new_y--;
+          else new_x++;
+        }
         m[new_y][new_x] = 1;
       }
     }
@@ -236,6 +240,10 @@ void rotate_clockwise(struct cetris_game* g) {
   rotate_matrix(g, 1);
 }
 
+void rotate_counterclockwise(struct cetris_game* g) {
+  rotate_matrix(g, 0);
+}
+
 int check_new_matrix(struct cetris_game* g, piece_matrix m) {
   vec2 r;
   for (int x = 0; x < 4; x++) {
diff --git a/cetris.h b/cetris.h
index e8c5323..15f5850 100644
--- a/cetris.h
+++ b/cetris.h
@@ -71,3 +71,4 @@ void move_left(struct cetris_game* g);
 void move_right(struct cetris_game* g);
 void move_hard_drop(struct cetris_game* g);
 void rotate_clockwise(struct cetris_game* g);
+void rotate_counterclockwise(struct cetris_game* g);
-- 
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