Cocos2D-X Platformer tutorial Part 7 – Gravity

Here we are after long consideration of the anchor point and solved some inconsistencies, I decided it would be best to make the anchor point at (0,0).

New Stuff

DAMPING removed – you are either moving at max speed left/right or not at all, like in megaman
GRAVITY – a constant force applied to players Y velocity, which forces it to go down
Collisions are checked once for X axis and once for Y
Since tile maps anchor point was at 0,0 I decided to change the players anchor point also to 0,0. This way all anchor points are at 0,0 and inconsistencies are avoided
Even though the anchor point is at 0,0, when I get the tiles around the player have to use the center point of it to actually get the tiles around players center
There is a new state Jumping, you can’t jump again while you are jumping, you can make it possible if you want to have double jump 🙂
tileCoordinateToPosition and positionToTileCoordinate have been changed, now it is easier to use them
Instead of using players content size, I’m using its bounding box for width/height because when I scale the size of players sprite, its content size does not change, keep it mind its important


#pragma once
 
#include "cocos2d.h"
using namespace cocos2d;
 
class Player : public Object
{
 
public: 
    //FIELDS
    enum State {
        Standing, Walking, Jumping
    };
 
    State state;
 
    bool facingRight;
    bool grounded;
    float stateTime;

	Size player_size;
 
    Point position;
    Point velocity;
 
    Player(void);
    virtual ~Player(void);
};

#pragma once

#include "cocos2d.h"

using namespace cocos2d;

class Player : public Object

{

public:

//FIELDS

enum State {

Standing, Walking, Jumping

};

State state;

bool facingRight;

bool grounded;

float stateTime;

Size player_size;

Point position;

Point velocity;

Player(void);

virtual ~Player(void);

};


#pragma once
 
#include "cocos2d.h"
#include <vector>
 
using namespace std;
using namespace cocos2d;
 
class Level : public Object
{
public:
 
    TMXTiledMap *map;
 
    void loadMap(const char* name);
    TMXTiledMap * getMap();
 
    Point tileCoordinateToPosition(Point point);
	Point positionToTileCoordinate(Point point);
	vector<Rect> getCollisionTiles(Point point, int fromX, int fromY);
 
    Level(void);
    virtual ~Level(void);
};

#pragma once

#include "cocos2d.h"

#include <vector>

using namespace std;

using namespace cocos2d;

class Level : public Object

{

public:

TMXTiledMap *map;

void loadMap(const char* name);

TMXTiledMap * getMap();

Point tileCoordinateToPosition(Point point);

Point positionToTileCoordinate(Point point);

vector<Rect> getCollisionTiles(Point point, int fromX, int fromY);

Level(void);

virtual ~Level(void);

};


#include "Level.h"
#include "globals.h"
 
void Level::loadMap(const char* mapname){
 
    map = TMXTiledMap::create(mapname);
    map->retain();
 
}
 
TMXTiledMap * Level::getMap(){
    return map;
}
 
Point Level::tileCoordinateToPosition(Point point){
 
    float x = floor(point.x * map->getTileSize().width * SCALE_FACTOR);
    float y = floor(point.y * map->getTileSize().height * SCALE_FACTOR);

    return Point(x, y);
 
}

Point Level::positionToTileCoordinate(Point point){

	 float x = floor(point.x / (map->getTileSize().width * SCALE_FACTOR));
	 float y = floor(point.y / (map->getTileSize().height * SCALE_FACTOR));

	 return Point((int)x, (int)y);
}

vector<Rect> Level::getCollisionTiles(Point point, int fromX, int fromY){

	vector<Rect> list;

	TMXLayer *walls = map->getLayer("walls");

	int mapheight = (int)map->getMapSize().height - 1;

	for (int a = fromX; a < 2; a++) {

		for (int b = fromY; b < 2; b++) {

			if(!(a == 10 && b == 10)){

				Sprite *tile = walls->getTileAt(Point((int)point.x + a, mapheight - ((int)point.y + b)));
				
				if (tile != NULL) {

							//CCLOG("%d %d",(int)point.x + a, mapheight - ((int)point.y + b));
							DrawNode *rectWithBorder = DrawNode::create();

							Vec2 vertices[] = 
							{ 
								Vec2(0, map->getTileSize().height * SCALE_FACTOR),
								Vec2(map->getTileSize().width * SCALE_FACTOR, map->getTileSize().height * SCALE_FACTOR), 
								Vec2(map->getTileSize().width * SCALE_FACTOR, 0),
								Vec2(0,0)
							};

							Point tmp = walls->positionAt(Point((int)point.x + a, mapheight - ((int)point.y + b)));
							rectWithBorder->setPosition(tmp.x * SCALE_FACTOR, tmp.y * SCALE_FACTOR);

							Rect tileRect = rectWithBorder->getBoundingBox();
		
							tileRect.setRect(rectWithBorder->getBoundingBox().getMinX(),
							rectWithBorder->getBoundingBox().getMinY(), 
							map->getTileSize().width * SCALE_FACTOR,
							map->getTileSize().height * SCALE_FACTOR);

							list.push_back(tileRect);
				}
			}
		}    
	}

	return list;

}
 
Level::Level(void)
{
}
 
Level::~Level(void)
{
    map->release();
}

#include "Level.h"

#include "globals.h"

void Level::loadMap(const char* mapname){

map = TMXTiledMap::create(mapname);

map->retain();

}

TMXTiledMap * Level::getMap(){

return map;

}

Point Level::tileCoordinateToPosition(Point point){

float x = floor(point.x * map->getTileSize().width * SCALE_FACTOR);

float y = floor(point.y * map->getTileSize().height * SCALE_FACTOR);

return Point(x, y);

}

Point Level::positionToTileCoordinate(Point point){

float x = floor(point.x / (map->getTileSize().width * SCALE_FACTOR));

float y = floor(point.y / (map->getTileSize().height * SCALE_FACTOR));

return Point((int)x, (int)y);

}

vector<Rect> Level::getCollisionTiles(Point point, int fromX, int fromY){

vector<Rect> list;

TMXLayer *walls = map->getLayer("walls");

int mapheight = (int)map->getMapSize().height - 1;

for (int a = fromX; a < 2; a++) {

for (int b = fromY; b < 2; b++) {

if(!(a == 10 && b == 10)){

Sprite *tile = walls->getTileAt(Point((int)point.x + a, mapheight - ((int)point.y + b)));

if (tile != NULL) {

//CCLOG("%d %d",(int)point.x + a, mapheight - ((int)point.y + b));

DrawNode *rectWithBorder = DrawNode::create();

Vec2 vertices[] =

{

Vec2(0, map->getTileSize().height * SCALE_FACTOR),

Vec2(map->getTileSize().width * SCALE_FACTOR, map->getTileSize().height * SCALE_FACTOR),

Vec2(map->getTileSize().width * SCALE_FACTOR, 0),

Vec2(0,0)

};

Point tmp = walls->positionAt(Point((int)point.x + a, mapheight - ((int)point.y + b)));

rectWithBorder->setPosition(tmp.x * SCALE_FACTOR, tmp.y * SCALE_FACTOR);

Rect tileRect = rectWithBorder->getBoundingBox();

tileRect.setRect(rectWithBorder->getBoundingBox().getMinX(),

rectWithBorder->getBoundingBox().getMinY(),

map->getTileSize().width * SCALE_FACTOR,

map->getTileSize().height * SCALE_FACTOR);

list.push_back(tileRect);

}

return list;

}

Level::Level(void)

{

}

Level::~Level(void)

{

map->release();

}


#pragma once
 
#include "cocos2d.h"
#include "Level.h"
#include "Player.h"
#include <algorithm>
#include <string>
#include <vector>
 
using namespace std;
USING_NS_CC;
 
class GameScene : public cocos2d::Layer
{
public:
   
    //FIELDS
    Level * level;
    Player *player;
    Sprite *player_sprite;
	Sprite *cameraTarget;

	Animate *walkRight;
	Animate *jumping;
	Animate *falling;

	boolean collidesX;

	Follow *camera;

	DrawNode *rectWithBorder;

    vector<EventKeyboard::KeyCode> heldKeys;
 
    //CONSTRUCTOR & METHODS
 
    virtual void onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event);
    virtual void onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event);
    
	void updateScene(float interval);

	void updatePlayer(float interval);
	void updatePlayerSprite(float interval);

    int signum(float x);
 
    static cocos2d::Scene* createScene();
 
    virtual bool init();  
    
    void menuCloseCallback(cocos2d::Ref* pSender);
	void setupAnimations();
    
    CREATE_FUNC(GameScene);
 
    GameScene(void);
    virtual ~GameScene(void);
};

#pragma once

#include "cocos2d.h"

#include "Level.h"

#include "Player.h"

#include <algorithm>

#include <string>

#include <vector>

using namespace std;

USING_NS_CC;

class GameScene : public cocos2d::Layer

{

public:

//FIELDS

Level * level;

Player *player;

Sprite *player_sprite;

Sprite *cameraTarget;

Animate *walkRight;

Animate *jumping;

Animate *falling;

boolean collidesX;

Follow *camera;

DrawNode *rectWithBorder;

vector<EventKeyboard::KeyCode> heldKeys;

//CONSTRUCTOR & METHODS

virtual void onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event);

virtual void onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event);

void updateScene(float interval);

void updatePlayer(float interval);

void updatePlayerSprite(float interval);

int signum(float x);

static cocos2d::Scene* createScene();

virtual bool init();

void menuCloseCallback(cocos2d::Ref* pSender);

void setupAnimations();

CREATE_FUNC(GameScene);

GameScene(void);

virtual ~GameScene(void);

};


#include "GameScene.h"
#include "globals.h"
 
 
Scene* GameScene::createScene()
{
    auto scene = Scene::create();
    
    auto layer = GameScene::create();
 
    scene->addChild(layer);
   
    return scene;
}
 
bool GameScene::init()
{
    if ( !Layer::init() )
    {
        return false;
    }
 
    level = new Level();
    level->loadMap("level1.tmx");
    level->retain();
 
    auto director = Director::getInstance();
    level->getMap()->setScale(SCALE_FACTOR);
 
    this->addChild(level->getMap());
 
    SpriteFrameCache::getInstance()->addSpriteFramesWithFile("solbrain.plist");
	AnimationCache::getInstance()->addAnimationsWithFile("solbrain-animations.plist");
 
    player_sprite = Sprite::createWithSpriteFrameName("idle");
	player_sprite->setScale(SCALE_FACTOR);
	player_sprite->setAnchorPoint(Point(0, 0));
	
    player_sprite->setFlippedX(true);

    Point point = Point(10,2);

    player_sprite->setPosition(level->tileCoordinateToPosition(point));
 
    player = new Player();
    player->retain();
	player->state = Player::State::Standing;
	player->position = player_sprite->getPosition();
	player->player_size.width = player_sprite->getBoundingBox().size.width;
	player->player_size.height = player_sprite->getBoundingBox().size.height;

	Point origin = Director::getInstance()->getVisibleOrigin();
    Size wsize = Director::getInstance()->getVisibleSize();  //default screen size (or design resolution size, if you are using design resolution)
    Point *center = new Point(wsize.width/2 + origin.x, wsize.height/2 + origin.y);

	cameraTarget = Sprite::create();
	cameraTarget->setPositionX(player_sprite->getPosition().x); // set to players x
	cameraTarget->setPositionY(wsize.height/2 + origin.y); // center of height

	cameraTarget->retain();

	this->setupAnimations();
    this->addChild(player_sprite);
    this->schedule(schedule_selector(GameScene::updateScene));

	this->addChild(cameraTarget);

	rectWithBorder = DrawNode::create();
	Vec2 vertices[] = 
	{ 
		Vec2(0, player_sprite->getBoundingBox().size.height),
		Vec2(player_sprite->getBoundingBox().size.width, player_sprite->getBoundingBox().size.height), 
		Vec2(player_sprite->getBoundingBox().size.width, 0),
		Vec2(0,0)
	};

	rectWithBorder->drawPolygon(vertices, 4, Color4F(0.0f,0.3f,0.3f,1), 0, Color4F(0.0f,0.2f,0.0f,1));
	
	addChild(rectWithBorder);

	camera = Follow::create(cameraTarget, Rect::ZERO);
	camera->retain();

	this->runAction(camera);
    return true;
}

void GameScene::setupAnimations(){

	AnimationCache *cache = AnimationCache::getInstance(); 
	Animation *animation = cache->getAnimation("walk");
	Animate* animate = Animate::create(animation);
	animate->getAnimation()->setRestoreOriginalFrame(true);
	animate->setDuration(0.80f);
	animate->setTarget(player_sprite);
	
	this->walkRight = animate;
	this->walkRight->retain();

}
 
void GameScene::updateScene(float delta){

	cameraTarget->setPositionX( player_sprite->getPosition().x );

	this->updatePlayer(delta);
 
}

void GameScene::updatePlayer(float delta){

		if (std::find(heldKeys.begin(), heldKeys.end(), SPACEBAR) != heldKeys.end()) {

			if(player->grounded){

					player->velocity.y = PLAYER_JUMP_VELOCITY;
					player->state = Player::State::Jumping;
					player->grounded = false;
			}

		}

	    if(std::find(heldKeys.begin(), heldKeys.end(), RIGHT_ARROW) != heldKeys.end()){

            player->velocity.x = PLAYER_MAX_VELOCITY;
            
			if(player->grounded){
                player->state = Player::State::Walking;				
            }

            player->facingRight = true;
        }
 
        if(std::find(heldKeys.begin(), heldKeys.end(), LEFT_ARROW) != heldKeys.end()){
 
			player->velocity.x = -PLAYER_MAX_VELOCITY;
            if(player->grounded){
                player->state = Player::State::Walking;
            }
            player->facingRight = false;
        }


		player->velocity -= Point(0, GRAVITY);
		

		///////////////////////////////////////////////////////
		Rect player_rect = player_sprite->getBoundingBox();
 
		Point tmp;
		vector<Rect> tiles;
		
		tmp = level->positionToTileCoordinate(Point(player->position.x + player->player_size.width * 0.5f , 
		player->position.y + player->player_size.height * 0.5f));

		/*if(player->velocity.x >= 0){
			tmp = level->positionToTileCoordinate(Point(player->position.x + player->player_size.width * 0.5f , 
				player->position.y + player->player_size.height * 0.5f));

		}else {
			
			tmp = level->positionToTileCoordinate(Point(player->position.x , 
				player->position.y + player->player_size.width * 0.5f));
			
		}*/

		tiles = level->getCollisionTiles(tmp, -1, 0);

		if(player->velocity.x >= 0){
				player_rect.setRect(
					player_sprite->getBoundingBox().getMinX() + player->velocity.x,
					player_sprite->getBoundingBox().getMinY(), 
					player->player_size.width,
					player->player_size.height
				);

				CCLOG("%f",player->player_size.width);
				
		}else {
				player_rect.setRect(
					player_sprite->getBoundingBox().getMinX() + player->velocity.x,
					player_sprite->getBoundingBox().getMinY(), 
					player->player_size.width,
					player->player_size.height
				);
		}

				
		for (Rect tile : tiles) {
			if (player_rect.intersectsRect(tile)) {
				player->velocity.x = 0;
				break;
            }
        }

		tiles.clear();

		tiles = level->getCollisionTiles(tmp, -1, -1);

		player_rect.setRect(
					player_sprite->getBoundingBox().getMinX(),
					player_sprite->getBoundingBox().getMinY() + player->velocity.y, 
					player->player_size.width,
					player->player_size.height
		);

		for (Rect tile : tiles) {
			player->grounded = false;
			if (tile.intersectsRect(player_rect)) {
				if (player->velocity.y > 0) {

					player->position.y -= player->velocity.y;

				} else {
					player->position.y = tile.getMaxY();
					// if we hit the ground, mark us as grounded so we can jump
					player->grounded = true;
				}
				player->velocity.y = 0;
				break;
            }
			
        }

        // unscale the velocity by the inverse delta time and set
        // the latest position
		player->position.x = player->position.x + player->velocity.x;
		player->position.y = player->position.y + player->velocity.y;
        
		this->updatePlayerSprite(delta);
 
		if(std::find(heldKeys.begin(), heldKeys.end(), RIGHT_ARROW) == heldKeys.end() && player->grounded){
            player->velocity.x = 0;
			player->state = Player::State::Standing;
        }
 
        if(std::find(heldKeys.begin(), heldKeys.end(), LEFT_ARROW) == heldKeys.end() && player->grounded){
			player->velocity.x = 0;
			player->state = Player::State::Standing;
        }
		
}

void GameScene::updatePlayerSprite(float delta){

	if(player->state == Player::State::Walking){

		if(walkRight->isDone()){
           walkRight->startWithTarget(player_sprite);
        }

		walkRight->step(delta);

		if(player->facingRight){    
			player_sprite->setFlippedX(true);
		}else {
			player_sprite->setFlippedX(false);
		}

	}else if(player->state == Player::State::Jumping){
		
		player_sprite->setSpriteFrame(Sprite::createWithSpriteFrameName("jump")->getSpriteFrame());
		if(player->facingRight){    
			player_sprite->setFlippedX(true);
		}else {
			player_sprite->setFlippedX(false);
		}

	}else{
		player_sprite->setSpriteFrame(Sprite::createWithSpriteFrameName("idle")->getSpriteFrame());
	}
    
	player_sprite->setPositionX( player->position.x );
	player_sprite->setPositionY( player->position.y );
	
	/*rectWithBorder->setPosition(player_sprite->getBoundingBox().getMinX(),
		player->position.y);*/
}
 
void GameScene::onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event)
{
    if(std::find(heldKeys.begin(), heldKeys.end(), keyCode) == heldKeys.end()){
            heldKeys.push_back(keyCode);
    }
}
 
void GameScene::onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event)
{
    heldKeys.erase(std::remove(heldKeys.begin(), heldKeys.end(), keyCode), heldKeys.end());
}
 
int GameScene::signum(float x) 
{ 
  if (x > 0.0L) 
    return 1.0L; 
  else if (x < 0.0L)   
    return -1.0L; 
  else   
    return 0.0L; 
}
 
void GameScene::menuCloseCallback(Ref* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
    return;
#endif
 
    Director::getInstance()->end();
 
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}
 
GameScene::GameScene(void)
{
    setKeyboardEnabled(true);
	collidesX = false;
}
GameScene::~GameScene(void)
{
}

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#include "GameScene.h"

#include "globals.h"

Scene* GameScene::createScene()

{

auto scene = Scene::create();

auto layer = GameScene::create();

scene->addChild(layer);

return scene;

}

bool GameScene::init()

{

if ( !Layer::init() )

{

return false;

}

level = new Level();

level->loadMap("level1.tmx");

level->retain();

auto director = Director::getInstance();

level->getMap()->setScale(SCALE_FACTOR);

this->addChild(level->getMap());

SpriteFrameCache::getInstance()->addSpriteFramesWithFile("solbrain.plist");

AnimationCache::getInstance()->addAnimationsWithFile("solbrain-animations.plist");

player_sprite = Sprite::createWithSpriteFrameName("idle");

player_sprite->setScale(SCALE_FACTOR);

player_sprite->setAnchorPoint(Point(0, 0));

player_sprite->setFlippedX(true);

Point point = Point(10,2);

player_sprite->setPosition(level->tileCoordinateToPosition(point));

player = new Player();

player->retain();

player->state = Player::State::Standing;

player->position = player_sprite->getPosition();

player->player_size.width = player_sprite->getBoundingBox().size.width;

player->player_size.height = player_sprite->getBoundingBox().size.height;

Point origin = Director::getInstance()->getVisibleOrigin();

Size wsize = Director::getInstance()->getVisibleSize(); //default screen size (or design resolution size, if you are using design resolution)

Point *center = new Point(wsize.width/2 + origin.x, wsize.height/2 + origin.y);

cameraTarget = Sprite::create();

cameraTarget->setPositionX(player_sprite->getPosition().x); // set to players x

cameraTarget->setPositionY(wsize.height/2 + origin.y); // center of height

cameraTarget->retain();

this->setupAnimations();

this->addChild(player_sprite);

this->schedule(schedule_selector(GameScene::updateScene));

this->addChild(cameraTarget);

rectWithBorder = DrawNode::create();

Vec2 vertices[] =

{

Vec2(0, player_sprite->getBoundingBox().size.height),

Vec2(player_sprite->getBoundingBox().size.width, player_sprite->getBoundingBox().size.height),

Vec2(player_sprite->getBoundingBox().size.width, 0),

Vec2(0,0)

};

rectWithBorder->drawPolygon(vertices, 4, Color4F(0.0f,0.3f,0.3f,1), 0, Color4F(0.0f,0.2f,0.0f,1));

addChild(rectWithBorder);

camera = Follow::create(cameraTarget, Rect::ZERO);

camera->retain();

this->runAction(camera);

return true;

}

void GameScene::setupAnimations(){

AnimationCache *cache = AnimationCache::getInstance();

Animation *animation = cache->getAnimation("walk");

Animate* animate = Animate::create(animation);

animate->getAnimation()->setRestoreOriginalFrame(true);

animate->setDuration(0.80f);

animate->setTarget(player_sprite);

this->walkRight = animate;

this->walkRight->retain();

}

void GameScene::updateScene(float delta){

cameraTarget->setPositionX( player_sprite->getPosition().x );

this->updatePlayer(delta);

}

void GameScene::updatePlayer(float delta){

if (std::find(heldKeys.begin(), heldKeys.end(), SPACEBAR) != heldKeys.end()) {

if(player->grounded){

player->velocity.y = PLAYER_JUMP_VELOCITY;

player->state = Player::State::Jumping;

player->grounded = false;

}

if(std::find(heldKeys.begin(), heldKeys.end(), RIGHT_ARROW) != heldKeys.end()){

player->velocity.x = PLAYER_MAX_VELOCITY;

if(player->grounded){

player->state = Player::State::Walking;

}

player->facingRight = true;

}

if(std::find(heldKeys.begin(), heldKeys.end(), LEFT_ARROW) != heldKeys.end()){

player->velocity.x = -PLAYER_MAX_VELOCITY;

if(player->grounded){

player->state = Player::State::Walking;

}

player->facingRight = false;

}

player->velocity -= Point(0, GRAVITY);

///////////////////////////////////////////////////////

Rect player_rect = player_sprite->getBoundingBox();

Point tmp;

vector<Rect> tiles;

tmp = level->positionToTileCoordinate(Point(player->position.x + player->player_size.width * 0.5f ,

player->position.y + player->player_size.height * 0.5f));

/*if(player->velocity.x >= 0){

tmp = level->positionToTileCoordinate(Point(player->position.x + player->player_size.width * 0.5f ,

player->position.y + player->player_size.height * 0.5f));

}else {

tmp = level->positionToTileCoordinate(Point(player->position.x ,

player->position.y + player->player_size.width * 0.5f));

}*/

tiles = level->getCollisionTiles(tmp, -1, 0);

if(player->velocity.x >= 0){

player_rect.setRect(

player_sprite->getBoundingBox().getMinX() + player->velocity.x,

player_sprite->getBoundingBox().getMinY(),

player->player_size.width,

player->player_size.height

);

CCLOG("%f",player->player_size.width);

}else {

player_rect.setRect(

player_sprite->getBoundingBox().getMinX() + player->velocity.x,

player_sprite->getBoundingBox().getMinY(),

player->player_size.width,

player->player_size.height

);

}

for (Rect tile : tiles) {

if (player_rect.intersectsRect(tile)) {

player->velocity.x = 0;

break;

}

tiles.clear();

tiles = level->getCollisionTiles(tmp, -1, -1);

player_rect.setRect(

player_sprite->getBoundingBox().getMinX(),

player_sprite->getBoundingBox().getMinY() + player->velocity.y,

player->player_size.width,

player->player_size.height

);

for (Rect tile : tiles) {

player->grounded = false;

if (tile.intersectsRect(player_rect)) {

if (player->velocity.y > 0) {

player->position.y -= player->velocity.y;

} else {

player->position.y = tile.getMaxY();

// if we hit the ground, mark us as grounded so we can jump

player->grounded = true;

}

player->velocity.y = 0;

break;

}

// unscale the velocity by the inverse delta time and set

// the latest position

player->position.x = player->position.x + player->velocity.x;

player->position.y = player->position.y + player->velocity.y;

this->updatePlayerSprite(delta);

if(std::find(heldKeys.begin(), heldKeys.end(), RIGHT_ARROW) == heldKeys.end() && player->grounded){

player->velocity.x = 0;

player->state = Player::State::Standing;

}

if(std::find(heldKeys.begin(), heldKeys.end(), LEFT_ARROW) == heldKeys.end() && player->grounded){

player->velocity.x = 0;

player->state = Player::State::Standing;

}

void GameScene::updatePlayerSprite(float delta){

if(player->state == Player::State::Walking){

if(walkRight->isDone()){

walkRight->startWithTarget(player_sprite);

}

walkRight->step(delta);

if(player->facingRight){

player_sprite->setFlippedX(true);

}else {

player_sprite->setFlippedX(false);

}

}else if(player->state == Player::State::Jumping){

player_sprite->setSpriteFrame(Sprite::createWithSpriteFrameName("jump")->getSpriteFrame());

if(player->facingRight){

player_sprite->setFlippedX(true);

}else {

player_sprite->setFlippedX(false);

}

}else{

player_sprite->setSpriteFrame(Sprite::createWithSpriteFrameName("idle")->getSpriteFrame());

}

player_sprite->setPositionX( player->position.x );

player_sprite->setPositionY( player->position.y );

/*rectWithBorder->setPosition(player_sprite->getBoundingBox().getMinX(),

player->position.y);*/

}

void GameScene::onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event)

{

if(std::find(heldKeys.begin(), heldKeys.end(), keyCode) == heldKeys.end()){

heldKeys.push_back(keyCode);

}

void GameScene::onKeyReleased(EventKeyboard::KeyCode keyCode, Event* event)

{

heldKeys.erase(std::remove(heldKeys.begin(), heldKeys.end(), keyCode), heldKeys.end());

}

int GameScene::signum(float x)

{

if (x > 0.0L)

return 1.0L;

else if (x < 0.0L)

return -1.0L;

else

return 0.0L;

}

void GameScene::menuCloseCallback(Ref* pSender)

{

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)

return;

#endif

Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

exit(0);

#endif

}

GameScene::GameScene(void)

{

setKeyboardEnabled(true);

collidesX = false;

}

GameScene::~GameScene(void)

{

}

This entry was posted in Cocos2D-X and tagged cocos2dx,gravity,platformer on October 11, 2014

Cocos2D-X Platformer tutorial Part 7 – Gravity

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