//14.4 - Ship.cpp - Mark Lee - Prima Publishing
//#include "ddraw.h"
#include "Ship.h"
//#include "globals.h"

Ship::Ship()
//construct a ship object
{
     //load the sprites onto the surface
     c_pddsone = DDLoadBitmap(g_pdd, "sprites.bmp",800,600);
     //make the sprite background transparent
     DDSetColorKey(c_pddsone,RGB(0,255,0));
     //calculate and store location of sprites
     for (int i = 0; i<4;i++)
     {
          sprites[i].top = 0;
          sprites[i].left = i*32;
          sprites[i].bottom = 31;
          sprites[i].right = i*32 + 31;
     }
     //provide a starting position,direction and speed
     position.top = 200;
     position.bottom = 231;
     position.left = 100;
     position.right = 131;
     direction = 3;
     speed = 4;
}

BOOL Ship::isCollision(int moveX, int moveY)
//test for a collision with land based on 
//how much the ship will move
{
     //figure out the filename of the current map
     char* temp;
     if (currentMapX == 0 && currentMapY == 0)
          temp = "map1.bmp";
     if (currentMapX == 1 && currentMapY == 0)
          temp = "map2.bmp";
     if (currentMapX == 2 && currentMapY == 0)
          temp = "map3.bmp";
     if (currentMapX == 0 && currentMapY == 1)
          temp = "map4.bmp";
     if (currentMapX == 1 && currentMapY == 1)
          temp = "map5.bmp";
     if (currentMapX == 2 && currentMapY == 1)
          temp = "map6.bmp";
     if (currentMapX == 0 && currentMapY == 2)
          temp = "map7.bmp";
     if (currentMapX == 1 && currentMapY == 2)
          temp = "map8.bmp";
     if (currentMapX == 2 && currentMapY == 2)
          temp = "map9.bmp";
     //use landCollision to test
     return landCollision(position.left%800 + 16 + 
          moveX, position.top%600 + 16 + moveY, temp);
}

void Ship::Move(int dir)
//move the ship
{
     //make this the new direction
     direction = dir;
     int moveX; //how much are we going to move?
     int moveY;
     //calculate where to move based on direction
     switch (direction)
     {
          case 0:
               moveX = speed;
               moveY = 0;
               break;
          case 1:
               moveX = 0;
               moveY = speed;
               break;
          case 2:
               moveX = -speed;
               moveY = 0;
               break;
          case 3:
               moveX = 0;
               moveY = -speed;
               break;
     }
     
     //if player is moving off of 3x3 map grid then don't move
     if ((position.bottom + moveY > 1799) || 
               (position.top + moveY < 0))
          moveY = 0;
     if ((position.right + moveX > 2399) || 
               (position.left + moveX < 0))
          moveX = 0;
     //if player is running into land then don't move
     if (isCollision(moveX, moveY))
     {
          moveX = 0;
          moveY = 0;
     }
     
     //move the ship
     position.top += moveY;
     position.bottom += moveY;
     position.left += moveX;
     position.right += moveX;
     
     //figure out if we changed maps
     int tempX = position.left/800;
     int tempY = position.top /600;
     //change current map if necessary
     if (tempX != currentMapX || tempY != currentMapY)
     {
          currentMapX = tempX;
          currentMapY = tempY;
     }
}

void Ship::Draw()
//draws the game screen
{
     //location is the position of screen to place the ship
     RECT location = makeRECT(position.left%800,
          position.top%600,
          position.right%800,
          position.bottom%600);
     //prepare the blitting info
     DDBLTFX ddbltfx;
     ZeroMemory(&ddbltfx,sizeof(ddbltfx));
     ddbltfx.dwSize = sizeof(ddbltfx);
     //copy the background map to the screen
     DDCopyBitmap(g_pddsback,
          entireMap[currentMapX][currentMapY],0,0,800,600);
     //write the ship on top, 
     //making the sprites background transparent
     g_pddsback->Blt(&location,c_pddsone,&sprites[direction],
          DDBLT_WAIT | DDBLT_KEYSRC,&ddbltfx);
     //display the screen
     g_pddsprimary->Flip(NULL,0);
}

void Ship::moveBack()
//moves backwards - used for getting out of town's area
{
     int temp;
     if (direction == 0)
          temp = 2;
     if (direction == 1)
          temp = 3;
     if (direction == 2)
          temp = 0;
     if (direction == 3)
          temp = 1;
     this->Move(temp);
}