SVG中的点击事件坐标 [英] Click event coordinates in SVG

问题描述

此包含SVG的HTML:

This HTML containing SVG:

<div class="container">
  <div class="spacer"></div>
  <svg>
    <g id="polygonGroup" transform="translate(80, 50)">
      <polygon points="-60,-10 -35,-30 -10,-10 -10,30 -60,30"></polygon>
      <polygon points="10,-10 35,-30 60,-10 60,30 10,30"></polygon>
      <polygon class="origin" points="-4,0 0,4 4,0 0,-4"></polygon>
    </g>
    <g id="textGroup" transform="translate(80, 50)">
      <text x="-35" y="10">Text</text>
      <text x="35" y="10">Text</text>
    </g>
  </svg>
</div>

和这个简单的jQuery click事件处理程序:

and this simple jQuery click event handler:

function clicked(event) {
    console.log(event.offsetX, event.offsetY);
}

$('svg').click(clicked);

如此处所示: https://jsfiddle.net/1ht0L8y6/6/有不同之处不同浏览器中的行为:

as seen here: https://jsfiddle.net/1ht0L8y6/6/ have different behaviors in different browsers:

Chrome浏览器:无论我在SVG中的哪个位置单击，坐标都基于SVG元素的左上角.这是我想要的行为.

Chrome: The coordinates are based on the top left of the SVG element, no matter where I click inside the SVG. This is the behavior I want.

Firefox :坐标基于我所处元素的左上角，这些元素可能是SVG，多边形或文本.

Firefox: The coordinates are based on the top left of whatever element I'm in, which may be SVG, polygon, or text.

IE和Edge:

• 在SVG中但不在其任何子元素中时，坐标 基于SVG元素.
• 在多边形中时，坐标为 基于<g>组的原点及其translate偏移量 (即黑钻石).负坐标可能是这种方式， 与Chrome或Firefox不同.
• 我观察到一种不同的行为 这些浏览器中的text元素:它们将根据以下信息给出坐标 文本元素的底部中间.但是我无法 在小提琴中重现这一点；在提琴中，文本元素的行为 与这些浏览器中的多边形相同.

• When in the SVG but not in any of its sub-elements, the coordinates are based on the SVG element.
• When in a polygon, the coordinates are based on the origin of the <g> group, with its translate offset (i.e., the black diamond). Negative coordinates are possible this way, unlike in Chrome or Firefox.
• I have observed a different behavior for text elements in these browsers: They would give coordinates based on the bottom middle of the text element. But I couldn't manage to reproduce this in the fiddle; in the fiddle text elements behave the same as polygons in these browsers.

获取点击坐标的可靠的跨浏览器方法是什么?

What is a reliable cross-browser way to get the coordinates of the click?

推荐答案

我在您的代码中添加了一个功能，用于检测SVG中的鼠标位置.

I've added to your code a function to detect the mouse position in SVG.

let svg = document.querySelector('svg')

function clicked(event) {
  let m = oMousePosSVG(event);
    console.log(m.x,m.y);
}

svg.addEventListener("click", clicked)


function oMousePosSVG(e) {
      var p = svg.createSVGPoint();
      p.x = e.clientX;
      p.y = e.clientY;
      var ctm = svg.getScreenCTM().inverse();
      var p =  p.matrixTransform(ctm);
      return p;
}

svg{border:1px solid}

<div class="container">
  <div class="spacer"></div>
  <svg>
    <g id="polygonGroup" transform="translate(80, 50)">
      <polygon points="-60,-10 -35,-30 -10,-10 -10,30 -60,30"></polygon>
      <polygon points="10,-10 35,-30 60,-10 60,30 10,30"></polygon>
      <polygon class="origin" points="-4,0 0,4 4,0 0,-4"></polygon>
    </g>
    <g id="textGroup" transform="translate(80, 50)" fill="red">
      <text x="-35" y="10">Text</text>
      <text x="35" y="10">Text</text>
    </g>
  </svg>
</div>

要了解有关SVG中鼠标检测的更多信息，我推荐这本书:

To read more about mouse detection in SVG I recommend this book: Using SVG with CSS3 and HTML5: Vector Graphics for Web Design

希望对您有帮助.

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