[英]How to set dynamic page size (auto) in XSL-FO using Apache FOP?
我想根據頁面內容設置動態的頁面大小。
也就是說，我希望PDF的頁面大小應與內容大小相同，而不是A4，字母或其他內容。
我的代碼是：
<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns="http://www.w3.org/1998/Math/MathML">
<fo:layout-master-set>
<fo:simple-page-master master-name="my-page">
<fo:region-body margin="1in"/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="my-page">
<fo:flow flow-name="xsl-region-body" font="12pt Times">
<fo:block font-size="1.5em" font-weight="bold" role="html:p">
<fo:instream-foreign-object>
<math display="inline">
<mrow>
<mi>A</mi>
<mo>=</mo>
<mi>Ï€</mi>
<msup>
<mi>r</mi>
<mn>2</mn>
</msup>
</mrow>
</math>
</fo:instream-foreign-object>
</fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
我得到的是：
我需要的是：
您可以通過稍微更改過程來完成您想要的事情。 JEuclid具有“ foprep”功能，可以將XSL FO內部的MathML轉換為嵌入式SVG。 然后，您可以在生成的XSL FO上應用標識轉換，以將SVG的尺寸用作頁面的尺寸。
我沒有進行完整的測試，但是樣本上的foprep會產生這樣的結果（請注意，我進行了一些更改，例如刪除了原始頁面上的任何邊距，並且還將塊上的line-height設置為“ 0”，以便大小適合圖像。
這是在文檔上運行“ foprep”的結果。
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns="http://www.w3.org/1998/Math/MathML">
<fo:layout-master-set>
<fo:simple-page-master master-name="my-page">
<fo:region-body/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="my-page">
<fo:flow flow-name="xsl-region-body" font="12pt Times">
<fo:block line-height="0">
<fo:instream-foreign-object alignment-adjust="-9.090909%">
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" color-interpolation="auto"
color-rendering="auto" contentScriptType="text/ecmascript"
contentStyleType="text/css" fill="black" fill-opacity="1"
font-family="'Dialog'" font-size="12" font-style="normal"
font-weight="normal" height="11" image-rendering="auto"
preserveAspectRatio="xMidYMid meet" shape-rendering="auto" stroke="black"
stroke-dasharray="none" stroke-dashoffset="0" stroke-linecap="square"
stroke-linejoin="miter" stroke-miterlimit="10" stroke-opacity="1"
stroke-width="1" text-rendering="auto" version="1.0" width="39"
zoomAndPan="magnify">
<!--Converted from MathML using JEuclid-->
<defs id="genericDefs"/>
<g>
<g color-interpolation="linearRGB" color-rendering="optimizeQuality"
image-rendering="optimizeQuality"
text-rendering="optimizeLegibility" transform="translate(0.5469,10)">
<path
d="M3.9688 0 L4.0312 -0.2812 Q4.2969 -0.3125 4.4453 -0.4375 Q4.5938 -0.5625 4.6562 -0.7969 Q4.7188 -1.0312 4.7188 -1.4062 Q4.7188 -1.625 4.7031 -1.9062 L4.6719 -2.6562 L2.0938 -2.6562 L1.7656 -2.0781 Q1.5312 -1.6719 1.4297 -1.3828 Q1.3281 -1.0938 1.3281 -0.875 Q1.3281 -0.375 1.9219 -0.2812 L1.8594 0 L-0.5469 0 L-0.4844 -0.2812 Q-0.2969 -0.3125 -0.1328 -0.4297 Q0.0312 -0.5469 0.2109 -0.7891 Q0.3906 -1.0312 0.7188 -1.5938 L4.4688 -8.0938 L5.3594 -8.0938 L5.7812 -1.5625 Q5.8125 -1.0938 5.8828 -0.8359 Q5.9531 -0.5781 6.0859 -0.4531 Q6.2188 -0.3281 6.4688 -0.2812 L6.4062 0 L3.9688 0 ZM2.3438 -3.1719 L4.6406 -3.1719 L4.5469 -5.0469 Q4.5312 -5.4375 4.5156 -6.0156 Q4.5 -6.5938 4.5 -6.8594 L4.4375 -6.8594 L2.3438 -3.1719 Z"
stroke="none"/>
</g>
<g color-interpolation="linearRGB" color-rendering="optimizeQuality"
image-rendering="optimizeQuality"
text-rendering="optimizeLegibility" transform="translate(9.0775,10)">
<path
d="M0.7344 -4.2344 L0.7344 -5.0469 L5.9219 -5.0469 L5.9219 -4.2344 L0.7344 -4.2344 ZM0.7344 -1.8125 L0.7344 -2.625 L5.9219 -2.625 L5.9219 -1.8125 L0.7344 -1.8125 Z"
stroke="none"/>
</g>
<g color-interpolation="linearRGB" color-rendering="optimizeQuality"
image-rendering="optimizeQuality"
text-rendering="optimizeLegibility"
transform="translate(17.7957,10)">
<path
d="M2.5 -1.4688 Q2.5 -1.0781 2.5234 -0.8906 Q2.5469 -0.7031 2.6094 -0.6016 Q2.6719 -0.5 2.7891 -0.4297 Q2.9062 -0.3594 3.1875 -0.2812 L3.1875 0 L0.7031 0 L0.7031 -0.2812 Q1.0781 -0.375 1.1953 -0.4922 Q1.3125 -0.6094 1.3516 -0.8203 Q1.3906 -1.0312 1.3906 -1.4688 L1.3906 -6.5312 Q1.3906 -6.9375 1.3672 -7.125 Q1.3438 -7.3125 1.2734 -7.4141 Q1.2031 -7.5156 1.0938 -7.5781 Q0.9844 -7.6406 0.7031 -7.7188 L0.7031 -8 L3.1875 -8 L3.1875 -7.7188 Q2.9219 -7.6406 2.8125 -7.5781 Q2.7031 -7.5156 2.6328 -7.4219 Q2.5625 -7.3281 2.5312 -7.1328 Q2.5 -6.9375 2.5 -6.5312 L2.5 -1.4688 ZM3.5176 -9.9062 L3.5176 -8.875 L2.5332 -8.875 L2.5332 -9.9062 L3.5176 -9.9062 ZM1.3457 -9.9062 L1.3457 -8.875 L0.377 -8.875 L0.377 -9.9062 L1.3457 -9.9062 ZM6.7344 -3.0781 Q6.7812 -2.5 6.9141 -2.0156 Q7.0469 -1.5312 7.2812 -1.1797 Q7.5156 -0.8281 7.8438 -0.625 Q8.1719 -0.4219 8.625 -0.4219 Q9.1094 -0.4219 9.4141 -0.5234 Q9.7188 -0.625 9.9219 -0.8516 Q10.125 -1.0781 10.3125 -1.5312 L10.8906 -1.5312 L10.8906 -0.2031 Q10.3594 -0.0625 9.7891 0.0156 Q9.2188 0.0938 8.5312 0.0938 Q7.2188 0.0938 6.4844 -0.7109 Q5.75 -1.5156 5.5938 -3.0781 L4.2031 -3.0781 L4.2031 -3.6406 L5.5625 -3.6406 L5.5625 -3.9375 Q5.5625 -4.2969 5.5938 -4.6719 L4.625 -4.6719 L4.625 -5.2344 L5.6875 -5.2344 Q5.9688 -6.6094 6.8125 -7.3516 Q7.6562 -8.0938 8.9062 -8.0938 Q9.4375 -8.0938 9.8828 -8.0391 Q10.3281 -7.9844 10.8906 -7.8281 L10.8906 -6.5 L10.3125 -6.5 Q10.1719 -6.9062 9.9531 -7.1406 Q9.7344 -7.375 9.4531 -7.4766 Q9.1719 -7.5781 8.7656 -7.5781 Q8.2812 -7.5781 7.8672 -7.3047 Q7.4531 -7.0312 7.1719 -6.5078 Q6.8906 -5.9844 6.7812 -5.2344 L10.3281 -5.2344 L10.3281 -4.6719 L6.7344 -4.6719 Q6.7031 -4.4062 6.7031 -4.0156 L6.7031 -3.8438 Q6.7031 -3.7344 6.7031 -3.6406 L9.9219 -3.6406 L9.9219 -3.0781 L6.7344 -3.0781 Z"
stroke="none"/>
</g>
<g color-interpolation="linearRGB" color-rendering="optimizeQuality"
image-rendering="optimizeQuality"
text-rendering="optimizeLegibility"
transform="translate(28.6863,10)">
<path
d="M2.3281 -5.6562 L2.6875 -5.6562 L2.2812 -4.2188 L2.3438 -4.1875 Q2.9062 -4.9531 3.4375 -5.3281 Q3.9688 -5.7031 4.5312 -5.7031 Q4.9531 -5.7031 5.2344 -5.625 L4.9531 -4.3125 L4.3594 -4.3125 Q4.3125 -4.625 4.2109 -4.7812 Q4.1094 -4.9375 3.8906 -4.9375 Q3.6719 -4.9375 3.375 -4.7031 Q3.0781 -4.4688 2.7656 -4.0625 Q2.4531 -3.6562 2.2969 -3.3047 Q2.1406 -2.9531 2.0625 -2.5312 L1.5312 0 L0.5156 0 L1.4062 -4 Q1.5312 -4.5469 1.5312 -4.8438 Q1.5312 -5 1.4766 -5.0938 Q1.4219 -5.1875 1.3047 -5.2344 Q1.1875 -5.2812 0.9062 -5.2969 L0.9688 -5.6094 L2.3281 -5.6562 Z"
stroke="none"/>
</g>
<g color-interpolation="linearRGB" color-rendering="optimizeQuality"
image-rendering="optimizeQuality"
text-rendering="optimizeLegibility"
transform="translate(33.9207,7.3281)">
<path
d="M3.0781 -0.7031 Q3.2969 -0.7031 3.4297 -0.7266 Q3.5625 -0.75 3.6406 -0.8125 Q3.7188 -0.875 3.7656 -0.9766 Q3.8125 -1.0781 3.8906 -1.2812 L4.2656 -1.2812 L4.1875 0 L0.5625 0 L0.5625 -0.2188 Q0.75 -0.6719 1.0703 -1.1562 Q1.3906 -1.6406 1.9844 -2.2969 Q2.5 -2.8594 2.7188 -3.1406 Q2.9688 -3.4688 3.0859 -3.6953 Q3.2031 -3.9219 3.2578 -4.125 Q3.3125 -4.3281 3.3125 -4.5469 Q3.3125 -4.875 3.2109 -5.125 Q3.1094 -5.375 2.8906 -5.5234 Q2.6719 -5.6719 2.3438 -5.6719 Q1.5156 -5.6719 1.2344 -4.75 L0.7031 -4.75 L0.7031 -5.5938 Q1.2344 -5.8438 1.6953 -5.9531 Q2.1562 -6.0625 2.5312 -6.0625 Q3.3438 -6.0625 3.7578 -5.7109 Q4.1719 -5.3594 4.1719 -4.6719 Q4.1719 -4.4375 4.1328 -4.2422 Q4.0938 -4.0469 3.9922 -3.8594 Q3.8906 -3.6719 3.7266 -3.4453 Q3.5625 -3.2188 3.3594 -2.9922 Q3.1562 -2.7656 2.6562 -2.25 Q1.8125 -1.3594 1.4219 -0.7031 L3.0781 -0.7031 Z"
stroke="none"/>
</g>
</g>
</svg>
</fo:instream-foreign-object>
</fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
現在，如果我將XSL應用於僅復制所有內容並獲取SVG的寬度和高度以用作頁面寬度和頁面高度的XSL。
此XSL將復制SVG的尺寸，並將其用作FO中的頁面寬度，頁面高度：
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:fo="http://www.w3.org/1999/XSL/Format" exclude-result-prefixes="svg" version="1.0">
<xsl:template match="fo:simple-page-master">
<fo:simple-page-master>
<xsl:apply-templates select="@*"/>
<xsl:attribute name="page-width">
<xsl:value-of select="concat(//*[namespace-uri()='http://www.w3.org/2000/svg' and local-name()='svg'][1]/@width,'px')"/>
</xsl:attribute>
<xsl:attribute name="page-height">
<xsl:value-of select="concat(//*[namespace-uri()='http://www.w3.org/2000/svg' and local-name()='svg'][1]/@height,'px')"/>
</xsl:attribute>
<xsl:apply-templates select="node()"/>
</fo:simple-page-master>
</xsl:template>
<xsl:template match="node()|@*">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
我將在頁面模板中獲得此輸出（僅顯示頁面母版）：
<fo:simple-page-master master-name="my-page" page-width="39px" page-height="11px">
<fo:region-body/>
</fo:simple-page-master>
如您所見，頁面寬度和頁面高度設置為SVG的尺寸。
此流程鏈將允許您將其格式化為SVG大小的頁面（由JEuclid計算）。
結果是這樣的：
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