Use ActionScript-like syntax to write html5 - Part 3, mouse events and game character movement-JS Tutorial-php.cn

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Use ActionScript-like syntax to write html5 - Part 3, mouse events and game character movement

黄舟

Jan 17, 2017 pm 04:35 PM

html5 mouse events

Part 3, Mouse Events and Game Character Movement

1, Assumption
Assume that all objects that can add mouse events have a mouseEvent method, and the added mouse events come through this mouseEvent transfer.
In this case, to add a mouse event, you only need to add a mouse event to the canvas, and then loop the childList in the LGlobal class, that is, loop all the visual objects. If a mouse event is added, then call its corresponding method. .
Second, implement
1, add the mouseEvent method to the LGlobal class, and then modify the setCanvas of the LGlobal class to implement the addition and calling of canvas mouse events

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);  
        }  
    }  
}

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2, add the mouseList array to the LSprite class, Used to save the added mouse event, and then add the mouseEvent method
In the mouseEvent method, we need to do 2 processes,
1) to determine whether we have added the mouse event. If not, loop its childList
2), if you add a mouse event to determine whether it is clicked, although LSprite is a visible class in the sense, it is currently invisible. What is visible is the Bitmap on it. To be precise, it is The BitmapData in this Bitmap class, to be more precise, is the Image in this BitmapData, so to determine whether it has been clicked, you need to determine whether the visual object in the childList in the LSprite has been clicked. If it is clicked, call the corresponding The method

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;  
    }

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ismouseon method is used to determine whether it is clicked
The LBitmap class also needs to determine whether it is clicked, so add 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;  
        }  
    }

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When adding mouse events, imitate ActionScript syntax

backLayer.addEventListener(LMouseEvent.MOUSE_DOWN, onmousedown);

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Next, prepare a map, a character walking map, and use mouse events to control the character's movement.

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;  
}

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The above is to use ActionScript-like syntax to write html5—— The third article covers mouse events and game character movement. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

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