用仿ActionScript的语法来编写html5——第三篇，鼠标事件与游戏人物移动

时间：2023-11-21 12:46:50

第三篇，鼠标事件与游戏人物移动

一，假设
假设，所有可添加鼠标事件的对象，都有一个mouseEvent方法，添加的鼠标事件同过这个mouseEvent来调用。
这样的话，添加鼠标事件，其实只需要给canvas添加一个鼠标事件，然后循环LGlobal类里的childList，即循环所有的可视对象，如果被添加了鼠标事件，那么就调用它相应的方法。
二，实现
1，给LGlobal类追加mouseEvent方法，然后修改LGlobal类的setCanvas，实现canvas的鼠标事件的添加与调用

LGlobal.setCanvas = function (id,width,height){

    LGlobal.canvasObj = document.getElementById(id);

    if(width)LGlobal.canvasObj.width = width;

    if(height)LGlobal.canvasObj.height = height;

    LGlobal.width = LGlobal.canvasObj.width;

    LGlobal.height = LGlobal.canvasObj.height;

    LGlobal.canvas = LGlobal.canvasObj.getContext("2d");

    LEvent.addEventListener(LGlobal.canvasObj,LMouseEvent.MOUSE_DOWN,function(event){

        LGlobal.mouseEvent(event,LMouseEvent.MOUSE_DOWN);

    });

}

LGlobal.mouseEvent = function(event,type){

    var key;

    for(key in LGlobal.childList){

        if(LGlobal.childList[key].mouseEvent){

            LGlobal.childList[key].mouseEvent(event,type);

        }

    }

}

2，给LSprite类添加mouseList数组，用来保存所添加的鼠标事件，然后添加mouseEvent方法
mouseEvent方法中，我们需要做2个处理，
1)，判断自己是否添加了鼠标事件，如果没有添加，则循环它的childList
2)，如果添加了鼠标事件，判断自己是否被点击,LSprite虽说意义上是可视类，但是其实目前它本身是不可见的，可见的是它上面的Bitmap,准确点说，是这个Bitmap类中的BitmapData,更准确点说，是这个BitmapData中的Image，所以判断自己是否被点击，需要判断的是LSprite中的childList中的可视对象是否被点击，如果被点击，则调用相应的方法

mouseEvent:function (event,type,cood){

        if(cood==null)cood={x:0,y:0};

        var self = this;

        if(self.mouseList.length == 0){

            for(key in self.childList){

                if(self.childList[key].mouseEvent){

                    self.childList[key].mouseEvent(event,type,{x:self.x+cood.x,y:self.y+cood.y});

                }

            }

            return;

        }

        if(self.childList.length == 0)return;

        var key;

        var isclick = false;

        for(key in self.childList){

            isclick = self.childList[key].ismouseon(event,{x:self.x+cood.x,y:self.y+cood.y});

            if(isclick)break;

        }

        if(isclick){

            for(key in self.mouseList){

                var obj = self.mouseList[key];

                if(obj.type == type){

                    event.selfX = event.offsetX - (self.x+cood.x);

                    event.selfY = event.offsetY - (self.y+cood.y);

                    event.currentTarget = self;

                    obj.listener(event);

                }

            }

            return;

        }

    },

    ismouseon:function(event,cood){

        var self = this;

        var key;

        var isclick = false;

        for(key in self.childList){

            isclick = self.childList[key].ismouseon(event,{x:self.x+cood.x,y:self.y+cood.y});

            if(isclick)break;

        }

        return isclick;

    }

ismouseon方法，用来判断自己是否被点击
LBitmap类中也需要判断是否自己被点击，所以添加ismouseon

ismouseon:function(event,cood){

        var self = this;

        if(event.offsetX >= self.x + cood.x && event.offsetX <= self.x + cood.x + self.width &&

            event.offsetY >= self.y + cood.y && event.offsetY <= self.y + cood.y + self.height){

            return true;

        }else{

            return false;

        }

    }

添加鼠标事件的时候，模仿ActionScript的语法

backLayer.addEventListener(LMouseEvent.MOUSE_DOWN, onmousedown);

下面，准备一张地图，一个人物行走图，用鼠标事件来控制人物的走动，

init(80,"back",800,480,main);

var list = new Array();

var index = 0;

var backLayer;

//地图

var mapimg;

//人物

var playerimg;

var loader

var imageArray;

var animeIndex = 0;

var dirindex = 0;

var dirarr = new Array({x:0,y:1},{x:-1,y:0},{x:1,y:0},{x:0,y:-1},{x:-1,y:1},{x:1,y:1},{x:-1,y:-1},{x:1,y:-1});

var dirmark = {"0,1":0,"-1,0":1,"1,0":2,"0,-1":3,"-1,1":4,"1,1":5,"-1,-1":6,"1,-1":7};

//移动目标

var toX = 0;

var toY = 0;

function main(){

    loader = new LLoader();

    loader.addEventListener(LEvent.COMPLETE,loadBitmapdata);

    loader.load("back.jpg","bitmapData");

}

function loadBitmapdata(event){

    var bitmapdata = new LBitmapData(loader.content);

    mapimg = new LBitmap(bitmapdata);

    loader = new LLoader();

    loader.addEventListener(LEvent.COMPLETE,loadOver);

    loader.load("1.png","bitmapData");

}

function loadOver(event){

    var bitmapdata = new LBitmapData(loader.content,0,0,70,92);

    imageArray = LGlobal.divideCoordinate(bitmapdata.image.width,bitmapdata.image.height,8,8);

    document.getElementById("inittxt").innerHTML="";

    playerimg = new LBitmap(bitmapdata);

    playerimg.bitmapData.setCoordinate(0,0);

    index = 0;

    backLayer = new LSprite();

    addChild(backLayer);

    backLayer.addChild(mapimg);

    backLayer.addChild(playerimg);

    backLayer.addEventListener(LEvent.ENTER_FRAME, onframe)

    backLayer.addEventListener(LMouseEvent.MOUSE_DOWN, onmousedown);

}

function onframe(){

    index++;

    if(index >= imageArray[0].length){

        index = 0;

    }

    var markx = 0,marky = 0;

    var l = 3;

    if(playerimg.x > toX){

        playerimg.x -= l;

        markx = -1;

    }else if(playerimg.x < toX){

        playerimg.x += l;

        markx = 1;

    }

    if(playerimg.y > toY){

        playerimg.y -= l;

        marky = -1;

    }else if(playerimg.y < toY){

        playerimg.y += l;

        marky = 1;

    }

    if(markx !=0 || marky != 0){

        var mark = markx+","+marky;

        dirindex = dirmark[mark];

    }

    playerimg.bitmapData.setCoordinate(imageArray[dirindex][index].x,imageArray[dirindex][index].y);

}

function onmousedown(event){

    toX = parseInt(event.selfX/3)*3;

    toY = parseInt(event.selfY/3)*3;

}

看一下成果吧
http://fsanguo.comoj.com/html5/jstoas02/index.html

下一篇，研究下继承吧

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