From d73c93b4c783edfc6f3afe19d35b9409953c7323 Mon Sep 17 00:00:00 2001
From: Stephen Enders <smenders@gmail.com>
Date: Wed, 27 Jan 2021 22:15:08 -0500
Subject: Legal placement logic and capturing

Use board_t for board and prevent illegal placements. And allow for
piece capture
---
 src/helper.cpp | 79 +++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 64 insertions(+), 15 deletions(-)

(limited to 'src/helper.cpp')

diff --git a/src/helper.cpp b/src/helper.cpp
index 96eb919..11374e8 100644
--- a/src/helper.cpp
+++ b/src/helper.cpp
@@ -36,10 +36,10 @@ next(int* p, int max)
   return i;
 }
 
-std::shared_ptr<std::vector<struct piece_t>>
+std::shared_ptr<std::vector<struct board_t>>
 createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
 {
-  auto board = std::make_shared<std::vector<struct piece_t>>();
+  auto board = std::make_shared<std::vector<struct board_t>>();
   sf::Texture& star_texture = (*textures)[STAR_TILE];
   int blank_idx = 0;
   int sp_idx = 0;
@@ -53,12 +53,12 @@ createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
   // p1 pieces
   // p1 star
   // id's don't matter
-  int id = 0;
   {
     sf::Sprite s;
     s.setTexture(star_texture);
     s.setPosition(pos(3, 5));
-    board->push_back({ id++, 3, s });
+    struct board_t bp = { P1_ID, 3, s };
+    board->push_back(bp);
   }
   // p1 start
   for (int i = 0; i < 3; i++) {
@@ -66,25 +66,29 @@ createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
     sf::Sprite s;
     s.setTexture(t);
     s.setPosition(pos(4 + i, 5));
-    board->push_back({ id++, 2 - i, s });
+    struct board_t bp = { P1_ID, 2 - i, s };
+    board->push_back(bp);
   }
   // p1 end
   {
     sf::Sprite goal;
     goal.setTexture((*textures)[P1_END]);
     goal.setPosition(pos(8, 5));
-    board->push_back({ id++, EXIT_SPACE, goal });
+    struct board_t exit_p = { P1_ID, EXIT_SPACE, goal };
+    board->push_back(exit_p);
 
     sf::Sprite end_star;
     end_star.setTexture(star_texture);
     end_star.setPosition(pos(9, 5));
-    board->push_back({ id++, EXIT_SPACE - 1, end_star });
+    struct board_t end_p = { P1_ID, EXIT_SPACE - 1, end_star };
+    board->push_back(end_p);
 
     sf::Texture& t = (*textures)[P1_BOARD_TILES[next(&sp_idx, 2)]];
     sf::Sprite s;
     s.setTexture(t);
     s.setPosition(pos(10, 5));
-    board->push_back({ id++, EXIT_SPACE - 2, s });
+    struct board_t bp = { P1_ID, EXIT_SPACE - 2, s };
+    board->push_back(bp);
   }
   // center pieces
   for (int i = 0; i < 8; i++) {
@@ -96,7 +100,8 @@ createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
       s.setTexture(t);
     }
     s.setPosition(pos(3 + i, 4));
-    board->push_back({ id++, 4 + i, s });
+    struct board_t bp = { SHARED_ID, 4 + i, s };
+    board->push_back(bp);
   }
   // p2 pieces
   // p2 star
@@ -104,7 +109,8 @@ createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
     sf::Sprite s;
     s.setTexture(star_texture);
     s.setPosition(pos(3, 3));
-    board->push_back({ id++, 3, s });
+    struct board_t bp = { P2_ID, 3, s };
+    board->push_back(bp);
   }
   // p2 start
   for (int i = 0; i < 3; i++) {
@@ -112,25 +118,29 @@ createBoard(std::shared_ptr<std::vector<sf::Texture>> textures)
     sf::Sprite s;
     s.setTexture(t);
     s.setPosition(pos(4 + i, 3));
-    board->push_back({ id++, 2 - i, s });
+    struct board_t bp = { P2_ID, 2 - i, s };
+    board->push_back(bp);
   }
   // p2 end
   {
     sf::Sprite goal;
     goal.setTexture((*textures)[P2_END]);
     goal.setPosition(pos(8, 3));
-    board->push_back({ id++, EXIT_SPACE, goal });
+    struct board_t goal_p = { P2_ID, EXIT_SPACE, goal };
+    board->push_back(goal_p);
 
     sf::Sprite end_star;
     end_star.setTexture(star_texture);
     end_star.setPosition(pos(9, 3));
-    board->push_back({ id++, EXIT_SPACE - 1, end_star });
+    struct board_t end_p = { P2_ID, EXIT_SPACE - 1, end_star };
+    board->push_back(end_p);
 
     sf::Texture& t = (*textures)[P2_BOARD_TILES[next(&sp_idx, 2)]];
     sf::Sprite end_tile;
     end_tile.setTexture(t);
     end_tile.setPosition(pos(10, 3));
-    board->push_back({ id++, EXIT_SPACE - 2, end_tile });
+    struct board_t bp = { P2_ID, EXIT_SPACE - 2, end_tile };
+    board->push_back(bp);
   }
 
   return board;
@@ -161,9 +171,10 @@ createPiece(int id, sf::Texture& texture)
 }
 
 std::shared_ptr<struct player_t>
-createPlayer(sf::Texture& texture)
+createPlayer(const int pid, sf::Texture& texture)
 {
   std::shared_ptr<struct player_t> player = std::make_shared<struct player_t>();
+  player->pid = pid;
   player->score = 0;
   player->pieces = std::make_shared<std::vector<struct piece_t>>();
   for (int i = 0; i < NUM_PIECES; i++) {
@@ -273,3 +284,41 @@ pos(float c, float r)
 {
   return { c * SPRITE_SIZE, r * SPRITE_SIZE };
 }
+
+bool
+canPlace(struct piece_t* piece,
+         int turn_pid,
+         struct board_t board_tile,
+         std::shared_ptr<std::vector<struct piece_t>> myPieces,
+         std::shared_ptr<std::vector<struct piece_t>> opponentPieces,
+         int& takenPieceId)
+{
+  if (board_tile.pid != turn_pid && board_tile.pid != SHARED_ID)
+    return false;
+  int position = board_tile.position;
+  if (position == EXIT_SPACE)
+    return true; // can always place in the exit
+
+  // can never collide with your own pieces
+  for (auto& p : (*myPieces)) {
+    if ((p.id != piece->id) // not the same
+        && (p.position == position)) {
+      return false; // collides with own pieces
+    }
+  }
+  // can collide with an enemy
+  if (position >= 4 && position <= 11) {
+    for (auto& p : (*opponentPieces)) {
+      // collided
+      if (p.position == position) {
+        // can not capture on safe space
+        if (position == SAFE_SPACE)
+          return false;
+        takenPieceId = p.id;
+        return true;
+      }
+    }
+  }
+
+  return true;
+}
-- 
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