Question

我知道SVG <g>标记没有X和Y属性，转发它的唯一方法是使用transform transform="translate(x,y)"和transform="rotate(45 50 50)"

我正在尝试使用JavaScript执行相同的可编程操作，我希望移动g标记，其中包含rect和text，下面是我的代码，所以错误是什么我点击它后g没有移动/翻译？

var NS="http://www.w3.org/2000/svg";     
var SVG=function(h,w){
    var svg=document.createElementNS(NS,"svg");
    svg.width=w;
    svg.height=h;
return svg;
}
var svg=SVG(1200,1500);
document.body.appendChild(svg);

class myRect {
  constructor(x,y,h,w,fill,name) {
   this.g= document.createElementNS(NS,"g");
   this.name=name;
   this.SVGObj= document.createElementNS(NS,"rect");
   self = this.SVGObj;
      self.x.baseVal.value=x;
      self.y.baseVal.value=y;
      self.width.baseVal.value=w;
      self.height.baseVal.value=h;
      self.style.fill=fill;
      
    this.text = document.createElementNS(NS, 'text');
    this.text.setAttribute('x', x+10);
    this.text.setAttribute('y', y+20);
    this.text.setAttribute('fill', '#000');
    this.text.textContent = '2';
    
    this.g.appendChild(self);
    this.g.appendChild(this.text)
    
    this.g.addEventListener("click",this,false);
  }
}

Object.defineProperty(myRect.prototype, "node", {
get: function node() {
    return this.g; // this.SVGObj;
}
});

myRect.prototype.handleEvent= function(evt){
self = this.g;
  switch (evt.type){
    case "click":
       // alert(this.name); // this.animate();    
       if (typeof self.moving == 'undefined' || self.moving == false) self.moving = true;
       else self.moving = false;
 
     if(self.moving == true)
       self.move = setInterval(()=>this.animate(),100);
       else{
       clearInterval(self.move); 
       self.parentNode.removeChild(self);
       }        
    break;
    default:
    break;
 }
}  

myRect.prototype.animate = function() {
       self = this.g;
       self.transform="translate(200,200)";
       //    self.x.baseVal.value+=1;
       //    self.y.baseVal.value+=1;
};

    var r= new myRect(50,50,30,30,'#'+Math.round(0xffffff * Math.random()).toString(16),'this is my name');
    svg.appendChild(r.node);

更新我尝试了self.setAttribute('transform','translate(10,10)')但没有工作，我只能使用self.setAttribute('transform','translate(10,10)');进行一次步骤，其中getItem（0）获取变换属性中的第一个元素，例如transform="translate(1, 1) scale(2)"其中getItem(0)获取translate(1, 1)矩阵，getItem(1)获得scale(2)解释here

但这仍然不是我需要的，一旦我点击g直到循环结束，我需要连续移动。

Answer 1

<html>

<body>
<div class="svg"></div>
</body>
<script>
var NS="http://www.w3.org/2000/svg";     
var SVG=function(h,w){
    var svg=document.createElementNS(NS,"svg");
    svg.width=w;
    svg.height=h;
return svg;
}
var svg=SVG(1200,1500);
var div =document.querySelector(".svg");
div.appendChild(svg);

class myRect {
  constructor(x,y,h,w,fill,name) {
   this.g= document.createElementNS(NS,"g");
   this.name=name;
   this.SVGObj= document.createElementNS(NS,"rect");
   self = this.SVGObj;
      self.x.baseVal.value=x;
      self.y.baseVal.value=y;
      self.width.baseVal.value=w;
      self.height.baseVal.value=h;
      self.style.fill=fill;

    this.text = document.createElementNS(NS, 'text');
    this.text.setAttribute('x', x+10);
    this.text.setAttribute('y', y+20);
    this.text.setAttribute('fill', '#000');
    this.text.textContent = '2';

    this.g.appendChild(self);
    this.g.appendChild(this.text)

    this.g.addEventListener("click",this,false);
  }
}

Object.defineProperty(myRect.prototype, "node", {
get: function node() {
    return this.g; // this.SVGObj;
}
});

myRect.prototype.handleEvent= function(evt){
self = this.g;
  switch (evt.type){
    case "click":
       // alert(this.name); // this.animate();    
       if (typeof self.moving == 'undefined' || self.moving == false) self.moving = true;
       else self.moving = false;

     if(self.moving == true)
       self.move = setInterval(()=>this.animate(evt),100);
       else{
       clearInterval(self.move); 
       self.parentNode.removeChild(self);
       }        
    break;
    default:
    break;
 }
}  

myRect.prototype.animate = function(evt) {
       self = this.g;
       var recElement=self.childNodes[0];
       recElement.setAttribute("x",10);
       recElement.setAttribute("y",10);
       //self.transform="translate(200,200)";

};

    var r= new myRect(50,50,30,30,'#'+Math.round(0xffffff * Math.random()).toString(16),'this is my name');
    svg.appendChild(r.node);


    </script>

Answer 2

感谢Mike Williamson，我能够解决它开发海关转换功能：

myRect.prototype.step = function(x,y) {
  return svg.createSVGTransformFromMatrix(svg.createSVGMatrix().translate(x,y));
}

并通过以下方式调用：

myRect.prototype.animate = function() {
   self = this.g;
   self.transform.baseVal.appendItem(this.step(1,1));
};

任何感兴趣的人的完整代码是：

var NS="http://www.w3.org/2000/svg";  
var SVG=function(el){
   return document.createElementNS(NS,el);
}

var svg = SVG("svg");
    svg.width='100%';
    svg.height='100%';
document.body.appendChild(svg);

class myRect {
     constructor(x,y,h,w,fill,name) {
     this.g= SVG("g");
     this.name=name;
     this.SVGObj= SVG('rect'); // document.createElementNS(NS,"rect");
        self = this.SVGObj;
        self.x.baseVal.value=x;
        self.y.baseVal.value=y;
        self.width.baseVal.value=w;
        self.height.baseVal.value=h;
        self.style.fill=fill;
        self.onclick="click(evt)";

this.text = SVG('text');
this.text.setAttribute('x', x+10);
this.text.setAttribute('y', y+20);
this.text.setAttribute('fill', '#000');
this.text.textContent = name;

this.g.appendChild(self);
// this.g.appendChild(this.text); // if required to be loaded from start up

this.g.addEventListener("click",this,false);
//(e)=>alert(e.target.parentNode.parentNode); / this is to check what is clicked
  }
}

Object.defineProperty(myRect.prototype, "node", {
   get: ()=> return this.g;
});

myRect.prototype.handleEvent= function(evt){
  self = evt.target.parentNode;  // this returns the `g` element
  switch (evt.type){
      case "click":   
          if (typeof self.moving == 'undefined' || self.moving == false) self.moving = true;
          else self.moving = false;

 if(self.moving == true){
 self.move = setInterval(()=>this.animate(),100);
 self.appendChild(this.text); // show the text node

 }

  else{
   clearInterval(self.move);
   self.removeChild(self.childNodes[1]); // remove the text node
 //  self.parentNode.removeChild(self);  // This removes the `g` element completly
  }        
break;
   default:
   break;
 }
}  

 myRect.prototype.step = function(x,y) {
    return svg.createSVGTransformFromMatrix(svg.createSVGMatrix().translate(x,y));
 }

 myRect.prototype.animate = function() {
   self = this.g;
   self.transform.baseVal.appendItem(this.step(1,1));
 };

 for (var i = 0; i < 10; i++) {
   var x = Math.random() * 100,
       y = Math.random() * 300;
  var r= new myRect(x,y,10,10,'#'+Math.round(0xffffff * Math.random()).toString(16),'click to stop');
   svg.appendChild(r.node);
  }

也可在JSFiddle

获取

使用JavaScript移动SVG'g'标签

2 个答案: