如何为SVG矩形制作动画 [英] How to animate svg rect to grow

问题描述

我正尝试使svg增长，作为一个基本的条形图，它从零增长到27.5的高度，例如我希望它从底部到顶部进行动画

I'm trying to make an svg grow, as a basic bar chart that is growing from zero to the height of 27.5, e.g. I want it to animate from bottom to top

我尝试了以下代码，但是它使矩形从顶部到底部而不是从底部到顶部（0高度->高度27.5）。

I tried the following code but it makes the rectangle grow from top to bottom, rather than bottom to top (0 height -> 27.5 height).

<?xml version="1.0" encoding="utf-8"?>
    <svg 
       version="1.1"
       id="MAIN"
       xmlns="http://www.w3.org/2000/svg" 
       xmlns:xlink="http://www.w3.org/1999/xlink"
       x="0px"
       y="0px"
       viewBox="0 0 1190.6 841.9" 
       enable-background="new 0 0 1190.6 841.9"
       xml:space="preserve">
           <rect
              id="barchart1" 
              x="148.8"
              y="190"
              fill="#921930"
              width="39.8"
              height="27.5">
                  <animate 
                     attributeName="height" 
                     from="0" 
                     to="27.5"
                     dur="3s"
                     fill="freeze"/>
           </rect>
    </svg>

http://jsfiddle.net/4kp5Lq53/

推荐答案

我认为您不必同时设置两个属性的动画'首先会发现使用 transform 属性更容易获得所需的坐标系。

Instead of animating two attributes simultaneously, I think you'll find it much easier to use a transform attribute to get the coordinate system you wanted in the first place.

在此示例中，动画的< rect> 元素包装在以下< g> 元素中：

In this example, the animated <rect> elements are wrapped in the following <g> element:

<g transform="scale(1,-1) translate(0,-200)">
  ...
</g>

scale 转换将所有y坐标颠倒过来，然后 translate 变换会移动坐标，以使 y = 0 在SVG画布的底部。

The scale transform turns all the y coordinates upside down, and the translate transform shifts the coordinates so that y=0 is at the bottom of the SVG canvas.

<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
     width="400" height="200" viewBox="0 0 400 200">
  <g transform="scale(1,-1) translate(0,-200)">
    <rect x="50" y="0" fill="#f00" width="100" height="100">
      <animate attributeName="height" from="0" to="100" dur="0.5s" fill="freeze" />
    </rect>
    <rect x="150" y="0" fill="#f70" width="100" height="200">
      <animate attributeName="height" from="0" to="200" dur="0.5s" fill="freeze" />
    </rect>
    <rect x="250" y="0" fill="#ec0" width="100" height="150">
      <animate attributeName="height" from="0" to="150" dur="0.5s" fill="freeze" />
    </rect>
  </g>
</svg>

这篇关于如何为SVG矩形制作动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！