From 7514077a07076403f29050e57fa87f24fc614122 Mon Sep 17 00:00:00 2001
From: Kelly Rauchenberger <fefferburbia@gmail.com>
Date: Sat, 16 Feb 2019 12:39:24 -0500
Subject: Shift-pushing

---
 src/simulation.cpp | 118 ++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 75 insertions(+), 43 deletions(-)

(limited to 'src/simulation.cpp')

diff --git a/src/simulation.cpp b/src/simulation.cpp
index 328b4f4..ca6ca3d 100644
--- a/src/simulation.cpp
+++ b/src/simulation.cpp
@@ -15,40 +15,68 @@ void Simulation::tick(
     if (entity.controllable &&
         !entity.moving)
     {
-      if (keystate[SDL_SCANCODE_LEFT] &&
-          moveEntityOnGrid(id, Direction::left, true))
+      if (keystate[SDL_SCANCODE_LSHIFT] || keystate[SDL_SCANCODE_RSHIFT])
       {
-        entity.shouldMoveTo = Direction::left;
-      }
-      else if (keystate[SDL_SCANCODE_UP] &&
-              moveEntityOnGrid(id, Direction::up, true))
-      {
-        entity.shouldMoveTo = Direction::up;
-      }
-      else if (keystate[SDL_SCANCODE_RIGHT] &&
-              moveEntityOnGrid(id, Direction::right, true))
-      {
-        entity.shouldMoveTo = Direction::right;
-      }
-      else if (keystate[SDL_SCANCODE_DOWN] &&
-              moveEntityOnGrid(id, Direction::down, true))
-      {
-        entity.shouldMoveTo = Direction::down;
-      }
-      else
-      {
-        entity.shouldMoveTo = Direction::none;
-      }
-
-      if (entity.shouldMoveTo != Direction::none)
-      {
-        moveEntityOnGrid(id, entity.shouldMoveTo);
-      }
-
-
-      if (entity.moving)
-      {
-
+        Direction lookDir = Direction::none;
+
+        if (keystate[SDL_SCANCODE_LEFT])
+        {
+          lookDir = Direction::left;
+        }
+        else if (keystate[SDL_SCANCODE_UP])
+        {
+          lookDir = Direction::up;
+        }
+        else if (keystate[SDL_SCANCODE_RIGHT])
+        {
+          lookDir = Direction::right;
+        }
+        else if (keystate[SDL_SCANCODE_DOWN])
+        {
+          lookDir = Direction::down;
+        }
+
+        vec2s lookPos = posInDir(entity.gridPos, lookDir);
+
+        for (id_type blockId : getGridEntities(lookPos))
+        {
+          Entity& block = entities_.at(blockId);
+
+          if (!block.moving && block.playerCanPush)
+          {
+            moveEntityOnGrid(blockId, lookDir);
+          }
+        }
+      } else {
+        if (keystate[SDL_SCANCODE_LEFT] &&
+            moveEntityOnGrid(id, Direction::left, true))
+        {
+          entity.shouldMoveTo = Direction::left;
+        }
+        else if (keystate[SDL_SCANCODE_UP] &&
+                moveEntityOnGrid(id, Direction::up, true))
+        {
+          entity.shouldMoveTo = Direction::up;
+        }
+        else if (keystate[SDL_SCANCODE_RIGHT] &&
+                moveEntityOnGrid(id, Direction::right, true))
+        {
+          entity.shouldMoveTo = Direction::right;
+        }
+        else if (keystate[SDL_SCANCODE_DOWN] &&
+                moveEntityOnGrid(id, Direction::down, true))
+        {
+          entity.shouldMoveTo = Direction::down;
+        }
+        else
+        {
+          entity.shouldMoveTo = Direction::none;
+        }
+
+        if (entity.shouldMoveTo != Direction::none)
+        {
+          moveEntityOnGrid(id, entity.shouldMoveTo);
+        }
       }
     }
 
@@ -143,7 +171,7 @@ bool Simulation::moveEntityOnGrid(
 {
   Entity& entity = entities_.at(id);
 
-  vec2s shouldMoveTo = entity.gridPos;
+  vec2s shouldMoveTo = posInDir(entity.gridPos, moveDir);
 
   switch (moveDir)
   {
@@ -154,8 +182,6 @@ bool Simulation::moveEntityOnGrid(
         return false;
       }
 
-      shouldMoveTo -= vec2s { 1, 0 };
-
       break;
     }
 
@@ -166,8 +192,6 @@ bool Simulation::moveEntityOnGrid(
         return false;
       }
 
-      shouldMoveTo += vec2s { 1, 0 };
-
       break;
     }
 
@@ -178,8 +202,6 @@ bool Simulation::moveEntityOnGrid(
         return false;
       }
 
-      shouldMoveTo -= vec2s { 0, 1 };
-
       break;
     }
 
@@ -190,8 +212,6 @@ bool Simulation::moveEntityOnGrid(
         return false;
       }
 
-      shouldMoveTo += vec2s { 0, 1 };
-
       break;
     }
   }
@@ -207,7 +227,7 @@ bool Simulation::moveEntityOnGrid(
     {
       Entity& block = entities_.at(blockId);
 
-      if (!block.playerCanPush)
+      if (block.moving || !block.playerCanPush)
       {
         return false;
       }
@@ -233,3 +253,15 @@ bool Simulation::moveEntityOnGrid(
 
   return true;
 }
+
+vec2s Simulation::posInDir(vec2s orig, Direction dir)
+{
+  switch (dir)
+  {
+    case Direction::left: return orig - vec2s { 1, 0 };
+    case Direction::right: return orig + vec2s { 1, 0 };
+    case Direction::up: return orig - vec2s { 0, 1 };
+    case Direction::down: return orig + vec2s { 0, 1 };
+    case Direction::none: return orig;
+  }
+}
-- 
cgit 1.4.1