//14.7 - Movement.cpp - Mark Lee - Prima Publishing
#include "Movement.h"

BOOL PointInRECT(int x, int y, RECT* rc)
//returns true if the point is inside the RECT
{
     //big if statement to test
     if (x < rc->right && x > rc->left && 
          y < rc->bottom && y > rc->top)
          return true;
     //return false if not inside
     return false;     
}

BOOL RECTinRECT(RECT* one, RECT* two)
//returns true if two RECTs are inside eachother
{
     //tests if any of the four corners of one are inside two
     if (PointInRECT(one->left, one->top, two))
          return true;
     if (PointInRECT(one->left, one->bottom, two))
          return true;
     if (PointInRECT(one->right, one->top, two))
          return true;
     if (PointInRECT(one->right, one->bottom, two))
          return true;
     //return false if not inside
     return false;
}

BOOL isInCity(RECT* pos)
//returns true if pos is within any town boundaries
{
     for (int i = 0; i <13; i++)
          //go through each tow one by one 
          //and test with RECTinRECT
          if (RECTinRECT(pos,&towns[i].position))
               return true;
     return false;
}

bool landCollision(int x, int y, string filename)
//returns true if the point at (x,y) is land
//uses filname as the name of a bitmap file to read from
{
     y = 599 - y;//switch to computer coordinates 
     //if (x,y) is offscreen then no collision
     if(x < 0 || y > 599)
          return false;
     if(y < 0 || x > 799)
          return false;
     //perform file io
     ifstream file(filename.c_str(), ios::in|ios::binary);
     //start redaing from the correct position
     file.seekg(3 * y * 800 + 3 * x + 54);
     //three bytes for each pixel
     //3 - Red, 2 - Green, 1 - Blue
     char array[3];
     file.read(array, 3);
     //end file io
     file.close();
     //if green is less than blue then we are in the sea
     if((int)array[1] < (int)array[0])
          return false;
     //otherwise there is a collision
     return true;
     
}

void DoMove()
//moves the ship based on what keys were pressed
{
     //process which direction to move based on input
     int dir = ship->GetDirection();
     if (moveUp == true)
          dir = 3;
     else if (moveDown == true)
          dir = 1;
     else if (moveLeft == true)
          dir = 2;
     else if (moveRight == true)
          dir = 0;
     else return;
     //actually move the ship
     ship->Move(dir);
}

RECT makeRECT(int x1, int y1, int x2, int y2)
//constructs a RECT from 4 integers
{
     //the theory: code it once, never have to code it again
     RECT temp;
     temp.left = x1;
     temp.top = y1;
     temp.right = x2;
     temp.bottom = y2;
     return temp;
}