使用 jQuery UI 滑块移动和缩放 svg 元素时遇到问题？

Question

我有一个带有已定义文本和路径的 SVG 元素。请参阅我的示例代码。

文本按需要工作，从中心缩放并且可以准确定位，但我在路径上遇到了严重的问题。

当我触摸滑块移动 x 或 y 时，比例尺会被甩掉，它总是从左上角开始缩放。我在网上尝试了很多例子，但我没有运气，所以我清理了示例代码。

我希望能够从它的中心缩放路径，并且当我改变它的位置时它不会影响缩放。

$( ".slider-x" ).slider({
      min: -530,
      max: 530,
      value: 165,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        $('.svg-size').attr("transform","translate("+x+","+y+")");
      }
});
$( ".slider-y" ).slider({
      min: -250,
      max: 250,
      value: -50,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        $('.svg-size').attr("transform","translate("+x+","+y+")");
      }
});
$( ".slider-scale" ).slider({
      min: 1,
      max: 100,
      value: 40,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        var scale = $( ".slider-scale" ).slider( "value" );
        $('.svg-size ').attr("transform","translate("+x+","+y+") scale(" + scale/100 + ")");
      }
});
$( ".slider-scale-title-text" ).slider({
      min: 1,
      max: 100,
      value: 40,
      slide: function(){
        var scale = $( ".slider-scale-title-text" ).slider( "value" );
        $('.svg-business-title').css("font-size", scale+ "px");
      }
});
$( ".slider-text-x" ).slider({
      min: -100,
      max: 635,
      value: 250,
      slide: function(){
        var x = $( ".slider-text-x" ).slider( "value" ),
            y = $( ".slider-text-y" ).slider( "value" );
        $('.title-text').attr("x",x);
      }
  
});
$( ".slider-text-y" ).slider({
      min: 0,
      max: 210,
      value: 150,
      slide: function(){
        var x = $( ".slider-text-x" ).slider( "value" ),
            y = $( ".slider-text-y" ).slider( "value" );
        $('.title-text').attr("y",y);
      }
      
});

h3 {
  font-family: verdana;
}
.svg-business-title {
  fill: brown;
  stroke-width: 4;
}
.svg-strap-line {
  fill: red;
  stroke-width: 4;
}
.svg-custom-logo-wrapper {
  fill: #94d31b;
  position:absolute;
  left:0; top:0; width:100%; height:100%;
}
.svg-wrapper {
  width: 100%;
  position:relative;
  height:180px;
}
.svg-container {
  max-width: 535px;
  margin: 0 auto;
}
.accent-colour-1 {
  fill: red;
}
.accent-colour-2 {
  fill: green;
}
.svg-size{
/*   transform: scale(0.2);
  -ms-transform: scale(0.2);
  -webkit-transform: scale(0.2); */
/*   transform-origin: 270px 5px; */
}
.slider-controls, .slider-scale-title-text {
  max-width: 540px;
}
.slider, input {
  margin: 10px 0 10px 10px;
}
button {
  margin: 5px 0 0 0;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<div class="svg-container">
<div class="svg-wrapper">
<svg data-logoid="123" width="535" height="180" viewBox="0 0 535 180" class="svg-custom-logo-wrapper" xmlns:xlink="http://www.w3.org/1999/xlink"> <rect width="535" height="180" style="fill:none;stroke-width:1;stroke:rgb(0,0,0)"/>
<g class="svg-size" transform="translate (165,-50) scale(0.4)"><path class="accent-colour-1 path-1" d="m 255,108 -97,97 -27,-27 -73,72 19,21 54,-54 106,107 -25,25 66,-26 105,-106 46,46 29,-11 -75,-74 -29,29 z m 0,40 79,79 -77,77 -79,-79 z m -16,63 h 14 v 14 h -14 z m 22,-22 h 14 v 14 h -14 z m 109,80 h 11 v 11 h -11 z m 18,-18 h 11 v 11 h -11 z m -278,43 h 16 v 15 h -16 z m 25,-25 h 16 v 15 h -16 z"></path></g>
<g class="svg-size" transform="translate (165,-50)  scale(0.4)"><path class="accent-colour-2 path-2" d="M 164,381 48,259 27,281 160,404 485,254 Z M 388,269 h 11 v 11 h -11 z m -18,-18 h 11 v 11 h -11 z m -235,43 h 16 v 15 h -16 z m -25,-25 h 16 v 15 h -16 z m 151,-58 h 14 v 14 h -14 z m -22,-22 h 14 v 14 h -14 z"></path></g>
<text text-anchor="middle" class="title-text svg-business-title" transform="scale(1)" x="250" y="150" font-size="40">Title Text Here</text>
</svg>
</div>
</div>
<div class="slider-controls">
  <p>LOGO</p>
  X<div class="slider slider-x"></div>
  Y<div class="slider slider-y"></div>
  Scale<div class="slider slider-scale"></div>
</div>
<div class="slider-controls">
  <p>Text</p>
  X<div class="slider slider-text-x"></div>
  Y<div class="slider slider-text-y"></div>
  Scale<div class="slider slider-scale-title-text">
</div>
</div>

Answer 1

您将一个转换属性用于三个独立的操作，实际上覆盖了您需要维护的值。此外，transform="scale()" 始终围绕局部坐标系的原点进行缩放。因此，要原地缩放路径，它们必须以 x = y = 0 为中心。

以可维护的方式纠正情况的步骤：

将路径的平移和缩放分布到两个封闭组，外层是平移（.svg-position），内层是缩放（.svg-size）。

确定路径的中心：

document.querySelector('.svg-size').getBBox()
// returns { x: 27, y: 108, width: 458, height: 296 }
// => center at 256, 256

引入一个将路径移动到原点的内部组：translate(-256, -256)
将 256 * 0.4 = 102（四舍五入）添加到起始翻译以使路径回到其初始位置。
相应地调整比例值。

$( ".slider-x" ).slider({
      min: -430,
      max: 630,
      value: 267,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        $('.svg-position').attr("transform","translate("+x+","+y+")");
      }
});
$( ".slider-y" ).slider({
      min: -150,
      max: 350,
      value: 52,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        $('.svg-position').attr("transform","translate("+x+","+y+")");
      }
});
$( ".slider-scale" ).slider({
      min: 1,
      max: 100,
      value: 40,
      slide: function(){
        var x = $( ".slider-x" ).slider( "value" ),
            y = $( ".slider-y" ).slider( "value" );
        var scale = $( ".slider-scale" ).slider( "value" );
        $('.svg-size ').attr("transform","scale(" + scale/100 + ")");
      }
});
$( ".slider-scale-title-text" ).slider({
      min: 1,
      max: 100,
      value: 40,
      slide: function(){
        var scale = $( ".slider-scale-title-text" ).slider( "value" );
        $('.svg-business-title').css("font-size", scale+ "px");
      }
});
$( ".slider-text-x" ).slider({
      min: -100,
      max: 635,
      value: 250,
      slide: function(){
        var x = $( ".slider-text-x" ).slider( "value" ),
            y = $( ".slider-text-y" ).slider( "value" );
        $('.title-text').attr("x",x);
      }
  
});
$( ".slider-text-y" ).slider({
      min: 0,
      max: 210,
      value: 150,
      slide: function(){
        var x = $( ".slider-text-x" ).slider( "value" ),
            y = $( ".slider-text-y" ).slider( "value" );
        $('.title-text').attr("y",y);
      }
      
});

h3 {
  font-family: verdana;
}
.svg-business-title {
  fill: brown;
  stroke-width: 4;
}
.svg-strap-line {
  fill: red;
  stroke-width: 4;
}
.svg-custom-logo-wrapper {
  fill: #94d31b;
  position:absolute;
  left:0; top:0; width:100%; height:100%;
}
.svg-wrapper {
  width: 100%;
  position:relative;
  height:180px;
}
.svg-container {
  max-width: 535px;
  margin: 0 auto;
}
.accent-colour-1 {
  fill: red;
}
.accent-colour-2 {
  fill: green;
}
.svg-size{
/*   transform: scale(0.2);
  -ms-transform: scale(0.2);
  -webkit-transform: scale(0.2); */
/*   transform-origin: 270px 5px; */
}
.slider-controls, .slider-scale-title-text {
  max-width: 540px;
}
.slider, input {
  margin: 10px 0 10px 10px;
}
button {
  margin: 5px 0 0 0;
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<div class="svg-container">
<div class="svg-wrapper">
<svg data-logoid="123" width="535" height="180" viewBox="0 0 535 180" class="svg-custom-logo-wrapper" xmlns:xlink="http://www.w3.org/1999/xlink"> <rect width="535" height="180" style="fill:none;stroke-width:1;stroke:rgb(0,0,0)"/>
<g class="svg-position" transform="translate(267,52)">
  <g class="svg-size" transform="scale(0.4)">
    <g transform="translate(-256 -256)">
      <path class="accent-colour-1 path-1" d="m 255,108 -97,97 -27,-27 -73,72 19,21 54,-54 106,107 -25,25 66,-26 105,-106 46,46 29,-11 -75,-74 -29,29 z m 0,40 79,79 -77,77 -79,-79 z m -16,63 h 14 v 14 h -14 z m 22,-22 h 14 v 14 h -14 z m 109,80 h 11 v 11 h -11 z m 18,-18 h 11 v 11 h -11 z m -278,43 h 16 v 15 h -16 z m 25,-25 h 16 v 15 h -16 z"></path>
      <path class="accent-colour-2 path-2" d="M 164,381 48,259 27,281 160,404 485,254 Z M 388,269 h 11 v 11 h -11 z m -18,-18 h 11 v 11 h -11 z m -235,43 h 16 v 15 h -16 z m -25,-25 h 16 v 15 h -16 z m 151,-58 h 14 v 14 h -14 z m -22,-22 h 14 v 14 h -14 z"></path>
    </g>
  </g>
</g>
<text text-anchor="middle" class="title-text svg-business-title" transform="scale(1)" x="250" y="150" font-size="40">Title Text Here</text>
</svg>
</div>
</div>
<div class="slider-controls">
  <p>LOGO</p>
  X<div class="slider slider-x"></div>
  Y<div class="slider slider-y"></div>
  Scale<div class="slider slider-scale"></div>
</div>
<div class="slider-controls">
  <p>Text</p>
  X<div class="slider slider-text-x"></div>
  Y<div class="slider slider-text-y"></div>
  Scale<div class="slider slider-scale-title-text">
</div>
</div>

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