这篇文章主要介绍了纯javascript实现的小游戏《Flappy Pig》,较为详细的分析了javascript实现小游戏《Flappy Pig》的相关技巧,涉及javascript操作页面元素移动、碰撞、事件监听与触发的相关技巧,需要的朋友可以参考下
本文实例讲述了纯javascript实现的小游戏《Flappy Pig》。分享给大家供大家参考。具体如下:
Flappy Pig,是Pig,使用原生javascript写的网页版“Flappy Bird”。我也奇了个怪为什么搞这个东西出来,而且还花了一天宝贵的周末,但是既然写出来,就拿出来和大家分享一下。
option.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- //设置
- self.option = {
- //重力加速度,屏幕像素和实际物理上的米有差别,所以存在换算
- g: 400,
- //跳跃的初速度,控制猪的弹跳力
- v0: 400,
- //柱子移动速度
- vp: 2.5,
- //频率,控制动画帧数,默认20ms
- frequency: 20,
- //关卡数
- levels: 100,
- //开头的空白距离
- safeLift: 500,
- //地板高度(和图片有关)
- floorHeight: 64,
- //猪的宽度
- pigWidth: 33,
- //猪的高度
- pigHeight: 30,
- //猪当前高度
- pigY: 300,
- //猪距离左边的距离,
- pigLeft: 80,
- //柱子Html
- pillarHtml: '<div class="top"></div><div class="bottom"></div>',
- //柱子宽度
- pillarWidth: 45,
- //柱子上下间隔高度
- pillarGapY: 108,
- //柱子左右间隔宽度
- pillarGapX: 250,
- //上柱子的基础定位值(就是top值,和css写法有关)
- pillarTop: -550,
- //下柱子的基础定位值
- pillarBottom: -500
- };
- return self;
- })(flappy || {})
util.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- //工具
- self.util = {
- preventDefaultEvent: function (event) {
- event = window.event || event;
- if (event) {
- if (event.preventDefault) {
- event.preventDefault();
- } else {
- event.returnValue = false;
- }
- }
- },
- $: function (id) {
- return document.getElementById(id);
- },
- getChilds: function (obj) {
- var childs = obj.children || obj.childNodes,
- childsArray = new Array();
- for (var i = 0, len = childs.length; i < len; i++) {
- if (childs[i].nodeType == 1) {
- childsArray.push(childs[i]);
- }
- }
- return childsArray;
- }
- };
- return self;
- })(flappy || {})
pig.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- var option = self.option,
- $ = self.util.$;
- //猪
- self.pig = {
- Y: 0, //猪当前高度(底边)
- init: function (overCallback, controller) {
- var t = this;
- t.s = 0, //位移
- t.time = 0, //时间
- t.$pig = $('pig');
- t.$pig.style.left = option.pigLeft + 'px';
- t._controller = controller;
- t._addListener(overCallback);
- },
- //添加监听
- _addListener: function (overCallback) {
- this._overCallback = overCallback;
- },
- //启动
- start: function () {
- var t = this,
- interval = option.frequency / 1000;
- t.s = option.v0 * t.time - t.time * t.time * option.g * 2; //竖直上抛运动公式
- t.Y = option.pigY + t.s;
- if (t.Y >= option.floorHeight) {
- t.$pig.style.bottom = t.Y + 'px';
- } else {
- t._dead();
- }
- t.time += interval;
- },
- //跳
- jump: function () {
- var t = this;
- option.pigY = parseInt(t.$pig.style.bottom);
- t.s = 0;
- t.time = 0;
- },
- //撞到地面时触发
- _dead: function () {
- this._overCallback.call(this._controller);
- },
- //撞到地面的处理
- fall: function () {
- var t = this;
- //摔到地上,修正高度
- t.Y = option.floorHeight;
- t.$pig.style.bottom = t.Y + 'px';
- },
- //撞到柱子的处理
- hit: function () {
- var t = this;
- //坠落
- var timer = setInterval(function () {
- t.$pig.style.bottom = t.Y + 'px';
- if (t.Y <= option.floorHeight) {
- clearInterval(timer);
- }
- t.Y -= 12;
- }, option.frequency);
- }
- };
- return self;
- })(flappy || {})
pillar.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- var option = self.option,
- util = self.util,
- $ = util.$;
- //柱子
- self.pillar = {
- currentId: -1, //当前柱子id
- init: function () {
- var t = this;
- //缓存上下柱子位置的换算因子
- t._factor = option.pillarBottom - option.pillarGapY + 450;
- //s表示一个位置,到达这个位置的柱子就是“当前的柱子”,就算是靠近猪了,开始计算猪有没有撞到这根柱子,10是提前量。
- t._s = option.pigLeft + option.pigWidth + 10;
- t._render();
- },
- //把柱子渲染到DOM树中
- _render: function () {
- var t = this,
- initleft = option.safeLift;
- t.left = 0;
- t.dom = document.createElement('div');
- t.dom.className = t.dom.id = 'pillarWrapper';
- for (var i = 0, j = option.levels; i < j; i++) {
- var el = document.createElement('div');
- el.innerHTML = option.pillarHtml;
- el.className = 'pillar';
- el.id = 'pillar-' + i;
- el.style.left = initleft + 'px';
- var childs = util.getChilds(el),
- topEl = childs[0],
- bottomEl = childs[1],
- pos = t._random(i);
- topEl.style.top = pos.top + 'px';
- bottomEl.style.bottom = pos.bottom + 'px';
- el.setAttribute('top', 600 + pos.top);
- el.setAttribute('bottom', 0 - pos.bottom);
- t.dom.appendChild(el);
- initleft += option.pillarGapX;
- }
- $('screen').appendChild(t.dom);
- },
- //计算柱子位置
- _random: function (i) {
- var t = this,
- x = Math.random(),
- h = Math.abs(Math.sin((i+1) * x)) * 290;
- return {
- top: option.pillarTop + h,
- bottom: t._factor - h
- }
- },
- //移动柱子
- move: function () {
- var t = this;
- t.dom.style.left = -t.left + 'px';
- t._find(t.left);
- t.left += option.vp;
- },
- //找到当前的柱子
- _find: function (l) {
- var t = this,
- x = (t._s + l - option.safeLift) / option.pillarGapX,
- intX = parseInt(x); //intX是当前柱子
- if (x > 0 && t.currentId != intX && Math.abs(x - intX) < 0.1) {
- t.currentId = intX;
- }
- }
- };
- return self;
- })(flappy || {})
position.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- var pig = self.pig,
- pillar = self.pillar,
- option = self.option,
- $ = self.util.$;
- //位置判断
- self.position = {
- init: function (overCallback, controller) {
- var t = this;
- t.pillarWrapper = $('pillarWrapper');
- t.pigX1 = option.pigLeft,
- t.pigX2 = option.pigLeft + option.pigWidth, //猪的左右位置,固定的
- t._controller = controller;
- t._addListener(overCallback);
- },
- //添加监听
- _addListener: function (overCallback) {
- this._overCallback = overCallback;
- },
- judge: function () {
- var t = this,
- currentPillar = $('pillar-' + pillar.currentId);
- if (pillar.currentId == -1) {
- return;
- }
- t.pigY2 = 600 - pig.Y;
- t.pigY1 = t.pigY2 - option.pigHeight; //猪的上下位置
- t.pY1 = currentPillar.getAttribute('top');
- t.pY2 = currentPillar.getAttribute('bottom');
- t.pX1 = parseInt(currentPillar.style.left) + parseInt(t.pillarWrapper.style.left);
- t.pX2 = t.pX1 + option.pillarWidth; //柱子的上下左右位置
- console.log(t.pillarWrapper.style.left);
- if (option.pigLeft + option.pigWidth >= t.pX1 && option.pigLeft <= t.pX2) {
- if (t.pigY1 < t.pY1 || t.pigY2 > t.pY2) {
- t._dead();
- }
- }
- },
- //撞到柱子时触发
- _dead: function () {
- this._overCallback.call(this._controller);
- },
- };
- return self;
- })(flappy || {})
controller.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- var pig = self.pig,
- pillar = self.pillar,
- pos = self.position,
- util = self.util,
- $ = util.$,
- option = self.option;
- //控制器
- self.controller = {
- init: function () {
- var t = this;
- t._isStart = false;
- t._timer = null;
- pig.init(t.fall, t);
- pillar.init();
- pos.init(t.hit, t);
- t.addKeyListener();
- },
- addKeyListener: function () {
- var t = this;
- document.onkeydown = function (e) {
- var e = e || event;
- var currKey = e.keyCode || e.which || e.charCode;
- if (currKey == 32) {
- t.jump();
- util.preventDefaultEvent(e);
- }
- }
- },
- jump: function () {
- var t = this;
- if (!t._isStart) {
- $('begin').style.display = 'none';
- t._createTimer(function () {
- pig.start();
- pillar.move();
- pos.judge();
- $('score').innerHTML = pillar.currentId + 1;
- });
- t._isStart = true;
- } else {
- pig.jump();
- }
- },
- hit: function () {
- var t = this;
- t.over();
- pig.hit();
- },
- fall: function () {
- var t = this;
- t.over();
- pig.fall();
- },
- over: function () {
- var t = this;
- clearInterval(t._timer);
- $('end').style.display = 'block';
- },
- _createTimer: function (fn) {
- var t = this;
- t._timer = setInterval(fn, option.frequency);
- }
- };
- return self;
- })(flappy || {})
game.js如下:
- /**
- * 原生javascript实现的《Flappy Pig》v0.1.0
- * =======================================
- * @author keenwon
- * Full source at http://keenwon.com
- */
- var flappy = (function (self) {
- 'use strict';
- var controller = self.controller,
- option = self.option,
- pig = self.pig,
- pillar = self.pillar,
- pos = self.position,
- util = self.util,
- $ = self.util.$;
- //主程序
- self.game = {
- init: function () {
- var t = this;
- t._isStart = false;
- t._isEnd = false;
- t._timer = null;
- pig.init(t.fall, t);
- pillar.init();
- pos.init(t.hit, t);
- t.addKeyListener();
- },
- addKeyListener: function () {
- var t = this;
- document.onkeydown = function (e) {
- var e = e || event;
- var currKey = e.keyCode || e.which || e.charCode;
- if (currKey == 32) {
- if (!t._isEnd) {
- t.jump();
- } else {
- window.location.reload();
- }
- util.preventDefaultEvent(e);
- }
- }
- },
- jump: function () {
- var t = this;
- if (!t._isStart) {
- $('start').style.display = 'none';
- t._createTimer(function () {
- pig.start();
- pillar.move();
- pos.judge();
- $('score').innerHTML = pillar.currentId + 1;
- });
- t._isStart = true;
- } else {
- pig.jump();
- }
- },
- hit: function () {
- var t = this;
- t.over();
- pig.hit();
- },
- fall: function () {
- var t = this;
- t.over();
- pig.fall();
- },
- over: function () {
- var t = this;
- clearInterval(t._timer);
- t._isEnd = true;
- $('end').style.display = 'block';
- },
- _createTimer: function (fn) {
- var t = this;
- t._timer = setInterval(fn, option.frequency);
- }
- };
- flappy.init = function () {
- self.game.init();
- }
- return self;
- })(flappy || {})
希望本文所述对大家的javascript程序设计有所帮助。
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