Snake5.1_futuretqi_贪吃蛇简易编程_源码

#include <QPainter> #include <QTime> #include "Snake.h" Snake::Snake(QWidget *parent) : QWidget(parent) { setStyleSheet("background-color:white;"); leftDirection = false; rightDirection = true; upDirection = false; downDirection = false; inGame = true; resize(B_WIDTH, B_HEIGHT); loadImages(); initGame(); } void Snake::loadImages() { dot.load("://images/dot.png"); head.load("://images/head.png"); apple.load("://images/apple.png"); } void Snake::initGame() { dots = 3; for (int z = 0; z < dots; z++) { x[z] = 50 - z * 10; y[z] = 50; } locateApple(); timerId = startTimer(DELAY); } void Snake::paintEvent(QPaintEvent *e) { Q_UNUSED(e); doDrawing(); } void Snake::doDrawing() { QPainter qp(this); if (inGame) { qp.drawImage(apple_x, apple_y, apple); for (int z = 0; z < dots; z++) { if (z == 0) { qp.drawImage(x[z], y[z], head); } else { qp.drawImage(x[z], y[z], dot); } } } else { gameOver(qp); } } void Snake::gameOver(QPainter &qp) { QString message = "Game over"; QFont font("Courier", 15, QFont::DemiBold); QFontMetrics fm(font); int textWidth = fm.width(message); qp.setFont(font); int h = height(); int w = width(); qp.translate(QPoint(w/2, h/2)); qp.drawText(-textWidth/2, 0, message); } void Snake::checkApple() { if ((x[0] == apple_x) && (y[0] == apple_y)) { dots++; locateApple(); } } void Snake::move() { for (int z = dots; z > 0; z--) { x[z] = x[(z - 1)]; y[z] = y[(z - 1)]; } if (leftDirection) { x[0] -= DOT_SIZE; } if (rightDirection) { x[0] += DOT_SIZE; } if (upDirection) { y[0] -= DOT_SIZE; } if (downDirection) { y[0] += DOT_SIZE; } } void Snake::checkCollision() { for (int z = dots; z > 0; z--) { if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) { inGame = false; } } if (y[0] >= B_HEIGHT) { inGame = false; } if (y[0] < 0) { inGame = false; } if (x[0] >= B_WIDTH) { inGame = false; } if (x[0] < 0) { inGame = false; } if(!inGame) { killTimer(timerId); } } void Snake::locateApple() { QTime time = QTime::currentTime(); qsrand((uint) time.msec()); int r = qrand() % RAND_POS; apple_x = (r * DOT_SIZE); r = qrand() % RAND_POS; apple_y = (r * DOT_SIZE); printf("%d %d", apple_x, apple_y); } void Snake::timerEvent(QTimerEvent *e) { Q_UNUSED(e); if (inGame) { checkApple(); checkCollision(); move(); } repaint(); } void Snake::keyPressEvent(QKeyEvent *e) { int key = e->key(); if ((key == Qt::Key_Left) && (!rightDirection)) { leftDirection = true; upDirection = false; downDirection = false; } if ((key == Qt::Key_Right) && (!leftDirection)) { rightDirection = true; upDirection = false; downDirection = false; } if ((key == Qt::Key_Up) && (!downDirection)) { upDirection = true; rightDirection = false; leftDirection = false; } if ((key == Qt::Key_Down) && (!upDirection)) { downDirection = true; rightDirection = false; leftDirection = false; } QWidget::keyPressEvent(e); }