From e0f7033bbd46e9d7a3376e8d6080760e41f9a2ae Mon Sep 17 00:00:00 2001
From: ChinmayMittal <chinmay3102@gmail.com>
Date: Sat, 16 Apr 2022 23:45:02 +0530
Subject: [PATCH] NPC object collision detection done

---
 Game.cpp |  9 +++++++++
 Game.h   |  1 +
 NPC.cpp  | 61 +++++++++++++++++++++++++++++++++++++++++++++++---------
 NPC.h    |  2 +-
 4 files changed, 63 insertions(+), 10 deletions(-)

diff --git a/Game.cpp b/Game.cpp
index f6bc093..2c128ed 100644
--- a/Game.cpp
+++ b/Game.cpp
@@ -895,4 +895,13 @@ void LGame::replaceTask(int task)
         it2 = std::find(currTasks.begin(), currTasks.end(), t);
     } while (it2 != currTasks.end());
     currTasks[index] = t;
+}
+
+int LGame :: getTileType( int x , int y ) 
+{
+    int tileX = x / mTileWidth;
+    int tileY = y / mTileHeight;
+    // std :: cout << x << " " << tileX << "\n" ; 
+    // std :: cout << y << " " << tileY << "\n" ;     
+    return tiles[tileY * mTilesX + tileX].getType();
 }
\ No newline at end of file
diff --git a/Game.h b/Game.h
index 2903c23..24d4e8b 100644
--- a/Game.h
+++ b/Game.h
@@ -105,6 +105,7 @@ class LGame : public LScreen
     bool hasTask(int task);
     void replaceTask(std::pair<int, std::string> task);
     void replaceTask(int task);
+    int getTileType( int x , int y ) ; 
 };
 
 #endif
\ No newline at end of file
diff --git a/NPC.cpp b/NPC.cpp
index 9bf003f..f99d971 100644
--- a/NPC.cpp
+++ b/NPC.cpp
@@ -2,6 +2,7 @@
 #include "Game.h"
 #include <stdlib.h>
 #include<time.h>
+#include<iostream>
 
 NPC :: NPC(LTexture &myTexture, LGame &game, int NPCHeight, int NPCWidth, int right, int left, int top, int bottom) : mTexture(myTexture) , mGame(game)
 {
@@ -12,10 +13,12 @@ NPC :: NPC(LTexture &myTexture, LGame &game, int NPCHeight, int NPCWidth, int ri
     mBox.y = 0 ; 
     mBox.w = NPCHeight ; 
     mBox.h = NPCWidth ; 
+    this -> NPCHeight = NPCHeight ; 
+    this -> NPCWidth = NPCWidth ; 
     velocity = 1 ; 
-    direction = 'U' ; 
+    direction = 'D' ; 
     mVelX = 0 ; 
-    mVelY = -velocity ; 
+    mVelY = +velocity ; 
     this -> right = right ; 
     this -> left = left ; 
     this -> top = top ; 
@@ -109,14 +112,21 @@ int NPC::render(SDL_Renderer *renderer, SDL_Rect &camera)
 
 void NPC::move()
 {
-        
+    // std :: cout << mBox.x << " " << mBox.y << " "<< mVelX << " " << mVelY << "\n"  ; 
     mBox.x += mVelX ;
-
+    bool boxFlipped = false ; 
     if ((mBox.x < 0) || (mBox.x + NPCWidth > mGame.getLevelWidth()) )
     {
         // move back
+        boxFlipped = true ; 
+        bool positive ; 
+        if( mBox.x < 0 ){
+            positive = true ; 
+        }else{
+            positive = false ;  
+        }
         mBox.x -= mVelX ; 
-        mVelX *= -1 ; 
+        mVelX = (positive) ? ( abs(mVelX)) : -(abs(mVelX)) ; 
     }
 
 
@@ -126,14 +136,24 @@ void NPC::move()
     if ((mBox.y < 0) || (mBox.y + NPCHeight > mGame.getLevelHeight()) )
     {
         // move back
-        mBox.y -= mVelY  ; 
-        mVelY *= -1 ;         
+        boxFlipped = true ; 
+        bool positive ; 
+        if( mBox.y < 0 ){
+            positive = true ; 
+        }else{
+            positive = false ;  
+        }
+        mBox.y -= mVelY ; 
+        mVelY = (positive) ? ( abs(mVelY)) : -(abs(mVelY)) ;     
+    }
+    if( mGame.getTileType( (mBox.x) + mBox.w/2 ,  mBox.y + ( mBox.h)/2 ) == 3 and not boxFlipped ){
+        switchDirection() ; 
     }
-
     current ++ ; 
     if( current == changeSpeed ) {
         current = 0 ; 
-        int rem = rand()%4 ; 
+        int rem = rand()%4 ;
+        mframes = 0 ;  
         switch (rem)
         {
         case 0:
@@ -155,4 +175,27 @@ void NPC::move()
 void NPC::cleanUp()
 {
     mTexture.free(); 
+}
+
+void NPC::switchDirection()
+{
+    switch ( direction )
+    {
+    case 'D':
+        direction = 'U' ;
+        mVelY *= -1 ; 
+        break;
+    case 'U':
+        direction = 'D' ; 
+        mVelY *= -1 ; 
+        break ; 
+    case 'R':
+        mVelX *=-1 ; 
+        direction = 'L' ; 
+        break ; 
+    case 'L' : 
+        mVelX *= -1 ; 
+        direction = 'R' ; 
+        break ; 
+    }
 }
\ No newline at end of file
diff --git a/NPC.h b/NPC.h
index 4c239a9..c37563d 100644
--- a/NPC.h
+++ b/NPC.h
@@ -17,7 +17,7 @@ class NPC : public Renderable
         int render(SDL_Renderer *renderer, SDL_Rect &camera);        
         void cleanUp();
         SDL_Rect getBox() ; 
-
+        void switchDirection() ; 
     private:
         LGame &mGame ; 
         SDL_Rect mBox ;