SDL-tutorial-test/PlayState.cpp at master · JOGUI22/SDL-tutorial-test · GitHub

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#include"PlayState.h"
#include"TextureManager.h"
#include"Game.h"
#include"InputHandler.h"
#include<iostream>

const string PlayState::s_playID = "PLAY";

usingnamespacestd;

PlayState::PlayState()
{
//ctor
}

voidPlayState::update()
{
//input behaviour
if(TheInputHandler::Instance()->isKeyDown(SDL_SCANCODE_ESCAPE))
 {
TheGame::Instance()->getStateMachine()->pushState(newPauseState());
 }

//update GameObjects
for(int i = 0; i < m_gameObjects.size(); i++)
 {
 m_gameObjects[i]->update();
 }

//Collision detection
if(checkCollision(dynamic_cast<SDLGameObject*>(m_gameObjects[0]), dynamic_cast<SDLGameObject*>(m_gameObjects[1])))
 {
TheGame::Instance()->getStateMachine()->pushState(newGameOverState());
 }
}

voidPlayState::render()
{
for (int i = 0; i < m_gameObjects.size(); i++)
 {
 m_gameObjects[i]->draw();
 }
}

boolPlayState::onEnter()
{
if(!TheTextureManager::Instance()->load("img/helicopter.png","helicopter", TheGame::Instance()->getRenderer())) //can't load images
 {
returnfalse;
 }
if(!TheTextureManager::Instance()->load("img/helicopter2.png", "helicopter2", TheGame::Instance()->getRenderer()))
 {
returnfalse;
 }
 GameObject* player = newPlayer (newLoaderParams(100, 100, 128, 55, 5, "helicopter"));
 GameObject* enemy = newEnemy (newLoaderParams(500, 100, 128, 55, 5, "helicopter2"));
 m_gameObjects.push_back(player);
 m_gameObjects.push_back(enemy);

 cout << "Entering PlayState" << endl;
returntrue;
}

boolPlayState::onExit()
{
for (int i = 0; i < m_gameObjects.size(); i++) //clear all existing gameObjects
 {
 m_gameObjects[i]->clean();
 }
 m_gameObjects.clear(); //clear vector

//clean textures
TheTextureManager::Instance()->clearFromTextureMap("helicopter");

 cout << "exiting PlayState " << endl;
returntrue;
}

string PlayState::getStateID() const
{
return s_playID;
}

boolPlayState::checkCollision(SDLGameObject* p1, SDLGameObject* p2)
{
int leftA, leftB;
int rightA, rightB;
int topA, topB;
int bottomA, bottomB;

//Calculate sides of rect b
 leftA = p1->getPosition().getX();
 rightA = p1->getPosition().getX() + p1->getWidth();
 topA = p1->getPosition().getY();
 bottomA = p1->getPosition().getY() + p1->getHeight();

//Calculate sides of rect b
 leftB = p2->getPosition().getX();
 rightB = p2->getPosition().getX() + p2->getWidth();
 topB = p2->getPosition().getY();
 bottomB = p2->getPosition().getY() + p2->getHeight();

//check collision
if (bottomA <= topB or topA >= bottomB or rightA <= leftB or leftA >= rightB) //no collision
returnfalse;
else
returntrue;

}