简单思路实现游戏----贪吃蛇源码

#include "Snake.h" const int KWidth = 18; const int KHeight = 10; const int KEggSize = 50; Scene* Snake::createScene() { auto scene = Scene::create(); scene->addChild(Snake::create()); return scene; } Snake::Snake() : m_curDir(EDirR), m_dt(0.5f) { } Snake::~Snake() { } bool Snake::init() { if(!Layer::init()) { return false; } auto listener = EventListenerTouchOneByOne::create(); listener->setSwallowTouches(true); listener->onTouchBegan = CC_CALLBACK_2(Snake::onTouchBegan, this); listener->onTouchMoved = CC_CALLBACK_2(Snake::onTouchMoved, this); listener->onTouchEnded = CC_CALLBACK_2(Snake::onTouchEnded, this); _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this); initUI(); initMap(); initSnake(); initEgg(); schedule(schedule_selector(Snake::step), m_dt); return true; } bool Snake::onTouchBegan(Touch* touche, Event* event) { _beganPos = touche->getLocation(); return true; } void Snake::onTouchMoved(Touch* touche, Event* event) { _movePos = touche->getLocation(); } void Snake::onTouchEnded(Touch* touche, Event* event) { _endPos = touche->getLocation(); } void Snake::initUI() { auto winsize = Director::getInstance()->getWinSize(); auto drawNode = DrawNode::create(); addChild(drawNode); Vec2 point[4]; point[0] = Vec2(118, 70); point[1] = Vec2(winsize.width - 118, 70); point[2] = Vec2(winsize.width - 118, winsize.height - 70); point[3] = Vec2(118, winsize.height - 70); drawNode->drawPolygon(point, 4, Color4F(1, 0, 0, 0), 3, Color4F(1, 0, 0, 1)); auto button = Button::create("test/btn_l.png"); button->setPosition(Vec2(59, winsize.height * 2 / 5)); button->setTag(ETagBtnLeft); button->addClickEventListener(CC_CALLBACK_1(Snake::buttonListener, this)); addChild(button); button = Button::create("test/btn_r.png"); button->setPosition(Vec2(winsize.width - 59, winsize.height * 2 / 5)); button->setTag(ETagBtnRight); button->addClickEventListener(CC_CALLBACK_1(Snake::buttonListener, this)); addChild(button); button = Button::create("test/btn_t.png"); button->setPosition(Vec2(59, winsize.height * 3 / 5)); button->setTag(ETagBtnTop); button->addClickEventListener(CC_CALLBACK_1(Snake::buttonListener, this)); addChild(button); button = Button::create("test/btn_b.png"); button->setPosition(Vec2(winsize.width - 59, winsize.height * 3 / 5)); button->setTag(ETagBtnButtom); button->addClickEventListener(CC_CALLBACK_1(Snake::buttonListener, this)); addChild(button); } void Snake::initMap() { for(int i = 0; i < KWidth; ++i) { for(int j = 0; j < KHeight; ++j) { m_pos[i][j] = Vec2(118 + KEggSize / 2 + KEggSize * i, 70 + KEggSize / 2 + KEggSize * j); } } } void Snake::buttonListener(Ref* ref) { int tag = ((Button*)ref)->getTag(); switch (tag) { case ETagBtnLeft: { m_curDir = EDirL; } break; case ETagBtnRight: { m_curDir = EDirR; } break; case ETagBtnTop: { m_curDir = EDirT; } break; case ETagBtnButtom: { m_curDir = EDirB; } break; default: break; } } void Snake::step(float dt) { //先取出蛇尾,便于吃到蛋后长大 TEgg lastSnake = m_snake[m_snake.size() - 1]; //后续的蛇身都挨个跟进 for(int i = (int)m_snake.size() - 1; i > 0; --i) { m_snake[i].x = m_snake[i - 1].x; m_snake[i].y = m_snake[i - 1].y; } //判断方向,确定蛇头位置 if(m_curDir == EDirL) { m_snake[0].x--; } else if(m_curDir == EDirR) { m_snake[0].x++; } else if(m_curDir == EDirT) { m_snake[0].y++; } else if(m_curDir == EDirB) { m_snake[0].y--; } //判断是否撞墙 if(m_snake[0].x < 0 || m_snake[0].x > KWidth - 1 || m_snake[0].y < 0 || m_snake[0].y > KHeight - 1) { //gameover unschedule(schedule_selector(Snake::step)); return; } //判断蛇头是否撞蛇身 for(int i = 1; i < m_snake.size(); ++i) { if(m_snake[0].x == m_snake[i].x && m_snake[0].y == m_snake[i].y) { //gameover unschedule(schedule_selector(Snake::step)); return; } } //判断是否吃到egg if(m_snake[0].x == m_egg.x && m_snake[0].y == m_egg.y) { m_eggs.push_back(m_egg); initEgg();//蛋被吃了，重新生成一个 //每吃一个蛋，蛇速度增大0.02f m_dt -= 0.01f; unschedule(schedule_selector(Snake::step)); schedule(schedule_selector(Snake::step), m_dt); } //判断是否蛇应该长大了 if(m_eggs.size() > 0 && m_eggs[0].x == lastSnake.x && m_eggs[0].y == lastSnake.y) { m_snake.push_back(m_eggs[0]); m_eggs.erase(m_eggs.begin()); auto sprite = Sprite::create("test/egg.png"); sprite->setPosition(m_pos[lastSnake.x][lastSnake.y]); addChild(sprite); m_snakeSprite.push_back(sprite); } //修改eggsprite位置 for(int i = 0; i < m_snakeSprite.size(); ++i) { m_snakeSprite[i]->setPosition(m_pos[m_snake[i].x][m_snake[i].y]); } } void Snake::initSnake() { m_snake.clear(); m_snakeSprite.clear(); int x = 3; int y = 5; for(int i = 0; i < 3; ++i) { TEgg egg; egg.x = x - i; egg.y = y; m_snake.push_back(egg); auto sprite = Sprite::create("test/egg.png"); sprite->setPosition(m_pos[egg.x][egg.y]); addChild(sprite); m_snakeSprite.push_back(sprite); } m_eggSprite = Sprite::create("test/egg.png"); m_eggSprite->setPosition(Vec2(-200, -200)); addChild(m_eggSprite); } void Snake::initEgg() { int x = rand() % KWidth; int y = rand() % KHeight; bool flag = false; for(int i = 0; i < m_snake.size(); ++i) { if(x == m_snake[i].x && y == m_snake[i].y) { flag = true; break; } } if(flag) { initEgg(); } else { m_egg.x = x; m_egg.y = y; m_eggSprite->setPosition(m_pos[x][y]); } }