From 001b91e335b90d5a0c8557f8d88377613d163c33 Mon Sep 17 00:00:00 2001
From: orangerot <orangerot@orangerot.dev>
Date: Wed, 15 Oct 2025 12:18:10 +0200
Subject: [PATCH] fix: preview

---
 domino.h |  2 +-
 game.c   | 40 ++++++++++++++++++++++++++--------------
 2 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/domino.h b/domino.h
index 4cf02b9..31f3084 100644
--- a/domino.h
+++ b/domino.h
@@ -4,7 +4,7 @@
 #define DOMINO_H
 
 struct eye {
-  size_t x,y,val,vertical;
+  int x,y,val,vertical;
 };
 
 struct brick {
diff --git a/game.c b/game.c
index 4d00c57..35e7fa7 100644
--- a/game.c
+++ b/game.c
@@ -27,40 +27,52 @@ bool has_active = 0;
 struct brick preview[256] = {0};
 size_t preview_count = 0;
 
-struct eye direction[4] = {
+#define DIRECTIONS 6
+struct eye direction[DIRECTIONS] = {
   {.x =  0, .y = -1},
   {.x = -2, .y =  0},
   {.x =  1, .y =  0},
   {.x =  0, .y =  1},
+  {.x = -1, .y = -1},
+  {.x = -1, .y =  1},
 };
 
 void get_prewiews() {
   preview_count = 0;
   for (size_t i = 0; i < bricks.count * 2; i++) {
     struct eye e = bricks.items.eye[i];
-    if (e.val != active.front.val) continue;
+    if (e.val != active.front.val && e.val != active.back.val) continue;
 
     struct brick p = active;
+
     p.front.x = e.x;
     p.front.y = e.y;
-    p.back.x = e.x + 1;
-    p.back.y = e.y;
-    struct brick previews[4] = {p, p, p, p};
-    for (size_t ii = 0; ii < 4; ii++) {
-      previews[ii].front.x += direction[ii].x;
-      previews[ii].front.y += direction[ii].y;
+    p.back.x =  e.x + !active.front.vertical;
+    p.back.y =  e.y +  active.front.vertical;
+
+    struct brick previews[DIRECTIONS] = {0};
+    for (size_t ii = 0; ii < DIRECTIONS; ii++) {
+      int offset_x = active.front.vertical ? direction[ii].y : direction[ii].x;
+      int offset_y = active.front.vertical ? direction[ii].x : direction[ii].y;
+      previews[ii] = p;
+      previews[ii].front.x += offset_x;
+      previews[ii].front.y += offset_y;
       previews[ii].front.val = 0;
 
-      previews[ii].back.x += direction[ii].x;
-      previews[ii].back.y += direction[ii].y;
+      previews[ii].back.x += offset_x;
+      previews[ii].back.y += offset_y;
 
       for (size_t iii = 0; iii < bricks.count * 2; iii++) {
-        previews[ii].front.val |= ((bricks.items.eye[iii].x == previews[ii].back.x && bricks.items.eye[iii].y == previews[ii].back.y) ||
-            (bricks.items.eye[iii].x == previews[ii].front.x && bricks.items.eye[iii].y == previews[ii].front.y));
+        previews[ii].front.val |= (
+            (bricks.items.eye[iii].x == previews[ii].back.x && bricks.items.eye[iii].y == previews[ii].back.y) ||
+            (bricks.items.eye[iii].x == previews[ii].front.x && bricks.items.eye[iii].y == previews[ii].front.y)
+            || (e.val == active.front.val && direction[ii].x < 0)
+            || (e.val == active.back.val  && direction[ii].x >= 0)
+            );
       }
     }
 
-    for (size_t ii = 0; ii < 4; ii++) {
+    for (size_t ii = 0; ii < DIRECTIONS; ii++) {
       if (!previews[ii].front.val)
         preview[preview_count++] = previews[ii];
     }
@@ -86,9 +98,9 @@ void key_callback(int key, int scancode, int action, int mods) {
         struct eye tmp = active.front;
         active.front.val = active.back.val;
         active.back.val = tmp.val;
-        get_prewiews();
       }
       active.front.vertical = !active.front.vertical;
+      get_prewiews();
       printf("rotate\n");
       break;
     case GLFW_KEY_ENTER: