-- 作者:wanghai00
-- 发布时间:9/30/2006 8:05:00 AM
-- Text-svg元素详解
本文为Scalable Vector Graphics (SVG) 1.1 Specification中text部分,学习笔记。 http://www.w3.org/TR/SVG11/text.html#TextElement 1.The 'text' element 主要属性有:x,y,dx,dy,rotate,textLength,lengthAdjust x,y表示文本的横纵坐标。 dx,dy表示移动的横纵坐标。 rotate表示旋转的度数。 Example text01 : <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1"> <desc>Example text01 - 'Hello, out there' in blue</desc> <text x="250" y="150" font-family="Verdana" font-size="55" fill="blue" > Hello, out there </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/text01.svg 2.tspan元素 Within a 'text' element, text and font properties and the current text position can be adjusted with absolute or relative coordinate values by including a 'tspan' element. 主要属性有:x,y,dx,dy,rotate,textLength,lengthAdjust 属性解释同上。 Example tspan01 <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1"> <desc>Example tspan01 - using tspan to change visual attributes</desc> <g font-family="Verdana" font-size="45" > <text x="200" y="150" fill="blue" > You are <tspan font-weight="bold" fill="red" >not</tspan> a banana. </text> </g> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/tspan01.svg Example tspan02 <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1"> <desc>Example tspan02 - using tspan's dx and dy attributes for incremental positioning adjustments</desc> <g font-family="Verdana" font-size="45" > <text x="200" y="150" fill="blue" > But you <tspan dx="2em" dy="-50" font-weight="bold" fill="red" > are </tspan> <tspan dy="100"> a peach! </tspan> </text> </g> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/tspan02.svg 3.tref元素 The textual content for a 'text' can be either character data directly embedded within the 'text' element or the character data content of a referenced element, where the referencing is specified with a 'tref' element 文本内容可以用text元素直接包含进来,或者用tref元素引用进来。 主要属性有:x,y,dx,dy,rotate,textLength,lengthAdjust,xlink:href xlink:href属性指定引用的url。其他属性同上。 Example tref01 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <text id="ReferencedText"> Referenced character data </text> </defs> <desc>Example tref01 - inline vs reference text content</desc> <text x="100" y="100" font-size="45" fill="blue" > Inline character data </text> <text x="100" y="200" font-size="45" fill="red" > <tref xlink:href="#ReferencedText"/> </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <text id="ReferencedText"> Referenced character data </text> </defs> <desc>Example tref01 - inline vs reference text content</desc> <text x="100" y="100" font-size="45" fill="blue" > Inline character data </text> <text x="100" y="200" font-size="45" fill="red" > <tref xlink:href="#ReferencedText"/> </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="3cm" viewBox="0 0 1000 300" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <text id="ReferencedText"> Referenced character data </text> </defs> <desc>Example tref01 - inline vs reference text content</desc> <text x="100" y="100" font-size="45" fill="blue" > Inline character data </text> <text x="100" y="200" font-size="45" fill="red" > <tref xlink:href="#ReferencedText"/> </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/tref01.svg 4.Text layout 'writing-mode' lr-tb | rl-tb | tb-rl | lr | rl | tb | inherit 本属性仅仅用于text元素,在 'tspan', 'tref', 'altGlyph' 和 'textPath'自元素中将忽略。 当文字竖排时,可以用'glyph-orientation-vertical' 属性来具体设置 'glyph-orientation-vertical' auto | <angle> | inherit 当文字横排时,可以用'glyph-orientation-horizontal' 属性来具体设置 'glyph-orientation-horizontal' <angle> | inherit 以上两属性的angle只能是90的倍数 'direction' ltr | rtl | inherit direction属性设置文本的排列方式。 要使direction属性生效,'unicode-bidi' 属性的值必须为'embed' 或者 'bidi-override'. 'unicode-bidi' normal | embed | bidi-override | inherit unicode-bidi属性设置文本的双向方式。 Example layout01 <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="10cm" height="5cm" viewBox="0 0 1000 500" xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <text id="myText">This is a test!</text> </defs> <desc>Example tref01 - inline vs reference text content</desc> <text font-size="60" fill="blue" font-family="Verdana"> <tref xlink:href="#myText" x="20" y="50"/> </text> <!-- 文字水平排列时,利用 glyph-orientation-horizontal属性来设置文layout --> <text font-size="60" fill="blue" font-family="Verdana"> <tref xlink:href="#myText" x="20" y="130" glyph-orientation-horizontal="180"/> </text> <!-- 当unicode-bidi属性值为embed或bidi-override时, 利用direction来设置文字layout --> <text font-size="60" fill="blue" font-family="Verdana"> <tref xlink:href="#myText" x="20" y="210" direction="rtl" unicode-bidi="bidi-override"/> </text> <!-- 利用writing-mode属性设置文字layout --> <text x="800" y="20" writing-mode="tb" font-size="60" fill="blue" font-family="Verdana"> This is a test! </text> <!-- 文字竖直排列时, 利用glyph-orientation-vertical属性来设置文字layout --> <text x="900" y="20" font-size="60" fill="blue" font-family="Verdana" writing-mode="tb" glyph-orientation-vertical="270"> This is a test! </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="498" fill="none" stroke="blue" stroke-width="2" /> </svg> 自己保存成.svg观看效果。文中有中文注释,所以可能要保存utf-8格式,方可正常显示。 5.Alignment properties 'text-anchor' start | middle | end | inherit text-anchor设置文本的排列属性。 6.Font selection properties 'font-family' 'font-style' normal | italic | oblique | inherit 'font-variant' normal | small-caps | inherit 'font-weight' normal | bold | bolder | lighter | 100 | 200 | 300| 400 | 500 | 600 | 700 | 800| 900 | inherit 'font-stretch' normal | wider | narrower |ultra-condensed | extra-condensed |condensed | semi-condensed |semi-expanded | expanded |extra-expanded | ultra-expanded | inherit 'font-size' <absolute-size> | <relative-size> |<length> | <percentage> | inherit 7.Spacing properties 'kerning' auto | <length> | inherit 'letter-spacing' normal | <length> | inherit 'word-spacing' normal | <length> | inherit 8.Text decoration 'text-decoration' none | [ underline || overline || line-through || blink ] | inherit Example textdecoration01 <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="12cm" height="4cm" viewBox="0 0 1200 400" xmlns="http://www.w3.org/2000/svg" version="1.1"> <desc>Example textdecoration01 - behavior of 'text-decoration' property</desc> <rect x="1" y="1" width="1198" height="398" fill="none" stroke="blue" stroke-width="2" /> <g font-size="60" fill="blue" stroke="red" stroke-width="1" > <text x="100" y="75">Normal text</text> <text x="100" y="165" text-decoration="line-through" > Text with line-through </text> <text x="100" y="255" text-decoration="underline" > Underlined text </text> <text x="100" y="345" text-decoration="underline" > <tspan>One </tspan> <tspan fill="yellow" stroke="purple" >word </tspan> <tspan fill="yellow" stroke="black" >has </tspan> <tspan fill="yellow" stroke="darkgreen" text-decoration="underline" >different </tspan> <tspan fill="yellow" stroke="blue" >underlining</tspan> </text> </g> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/textdecoration01.svg 9.text on path 主要属性有:startOffset,textLength,lengthAdjust,method,spacing startOffset设置文字开始的位置。startOffset = "<length>" method设置文字与路径的位置关系。method = "align | stretch" align为默认值。 spacing设置文字与路径的空间。spacing = "auto | exact" exact为默认值。 xlink:href设置绑定的路径。 Example toap01 <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="12cm" height="3.6cm" viewBox="0 0 1000 300" version="1.1" xmlns=http://www.w3.org/2000/svg xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <path id="MyPath" d="M 100 200 C 200 100 300 0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100" /> </defs> <desc>Example toap02 - tspan within textPath</desc> <use xlink:href="#MyPath" fill="none" stroke="red" /> <text font-family="Verdana" font-size="42.5" fill="blue" > <textPath xlink:href="#MyPath"> We go <tspan dy="-30" fill="red" > up </tspan> <tspan dy="30"> , </tspan> then we go down, then up again </textPath> </text> <!-- Show outline of canvas using 'rect' element --> <rect x="1" y="1" width="998" height="298" fill="none" stroke="blue" stroke-width="2" /> </svg> 效果展示:http://www.w3.org/TR/SVG11/images/text/toap02.svg 10.White space handling xml:space default|preserve
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