我们如何从变换矩阵中得到x和y? [英] How we get x and y from the transform matrix?

问题描述

可能重复:
如何通过转换和矩阵获取SVG中元素的实际x/y位置

Possible Duplicate:
How to get the actual x/y position of an element in SVG with transformations and matrices

我需要获取在SVG中这样编写的元素的x/y位置:

I need to get the x/y positions of an element that is written like this in SVG:

<image
   y="-421.28461"
   x="335.27295"
   id="image2991"
   xlink:href="file:///C:/Users/tom/Documents/t.jpg"
   height="369"
   width="360"
   transform="matrix(0.22297057,0.97482518,-0.97482518,0.22297057,0,0)" />

此处x&给出了y属性，但是没有给出图像的实际位置.据我在

Here x & y attributes are given but this not gives the image actual position. As much as i know in the

转换矩阵[a,b,c,d,e,f] e& f分别在x和y中给出平移轴.但是

transform matrix [a,b,c,d,e,f] e & f gives the translated axis in the x and y respectively. But the

问题在于，这两个( e & f )都为0.现在我可以获取此图像的实际x任何y吗?

problem is that here both ( e & f ) are 0. Now i can i get the actual x any y for this image?

推荐答案

假设

x="335.27295"
y="-421.28461"

给出变换矩阵

a              b          e
c              d          f
0              0          1

具有值

0.22297057     0.97482518 0
-0.97482518    0.22297057 0
0              0          1

知道

• a，d分别负责缩放x，y
• e，f负责分别转换x，y

您最终会得到

newX = x * a + e
newY = y * d + f

或者，

newX = 335.27295 * 0.22297057 + 0 = 74.75
newY = -421.28461 * 0.22297057 + 0 = -93.93

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