如何使用变换和矩阵获取SVG中元素的实际x / y位置
我需要获取SVG中这样写的元素的x / y位置:
I need to get the x/y positions of an element that is written like this in SVG:
<g transform="scale(10,10)" id="g6558">
<text transform="matrix(1,0,0,-1,236.532,417.253)" id="text6560">
<tspan x="0 4.448" y="0" id="tspan6562">10</tspan>
</text>
</g>
如何获得 tspan $ c $的当前位置c>这种情况下的元素?我必须手动计算它们,因为我不能使用
getBBox()
或其他本机函数,因为我使用Flash包装器来显示SVG(http:// code.google.com/p/svgweb/),它只支持基本属性,标记名称等。
How do I get the current position of the tspan
element in this case? I have to manually calculate them as I can't use getBBox()
or other native functions because I'm using a Flash-wrapper to display the SVG (http://code.google.com/p/svgweb/) which only supports basic attributes, tag names etc.
如何在x / y位置上计算矩阵和变换元素?
How are the matrices and transformations caluclated on the x/y position of the element?
除了我理解你的问题,你需要知道一个元素的x和y坐标在转换之后。
As well as i understood your problem, you need to know the x and y co-ordinates of an element, after it is transformed.
在数学上,所有转换都可以表示为以下形式的3x3转换矩阵:
Mathematically, all transformations can be represented as 3x3 transformation matrices of the following form:
a b e
c d f
0 0 1
由于在上述3x3矩阵中仅使用了六个值,因此转换矩阵也表示为向量: [abcdef]
。
a和d分别负责x和y的缩放,而e和f分别给出x和y中的平移轴。
所以在你的代码中
Since only six values are used in the above 3x3 matrix, a transformation matrix is also expressed as a vector: [a b c d e f]
.
a and d responsible for scaling in x and y respectively, whereas e and f gives you the translated axis in the x and y respectively.
So In your code which is
<text transform="matrix(1,0,0,-1,236.532,417.253)" id="text6560">
<tspan x="0 4.448" y="0" id="tspan6562">10</tspan>
</text>
元素文本在y轴的x轴417.253中被翻译为236.532。
所以tspan x点变为236 .. + 4.4 ..和y点417 .. + 0。
Element text is translated 236.532 in the x-axis 417.253 in the y-axis. So tspan x point becomes 236.. + 4.4.. and y point 417.. + 0.