最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
1.18.1. SVG radioactive gradient- ¶ elements are used to define radioactive gradients. labels must be nested in the on the inside. tag is an acronym for definitions that defines special elementssuch as gradients. 1.18.2. Example 1 ¶
Define a radioactive gradient from white to blue ellipse:
Here is the SVG code:Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <defs> <radialGradient id="grad1" cx="50%" cy="50%" r="50%" fx="50%" fy="50%"> <stop offset="0%" style="stop-color:rgb(255,255,255); stop-opacity:0" /> <stop offset="100%" style="stop-color:rgb(0,0,255);stop-opacity:1" /> radialGradient> defs> <ellipse cx="200" cy="70" rx="85" ry="55" fill="url(#grad1)" /> svg> Code parsing:
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id attribute of the tag defines a unique name for the gradient -
Outermost circle defined by CX,CY and r attributes and innermost circle defined by Fx and Fy
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The gradient color range can consist of two or more colors. Use one for eachcolor label assignment. offset property is used to define the start and end of a gradient -
Populate the attribute to ellipse elements are linked to this gradient
1.18.3. Example 2 ¶
Another ellipse that defines the radioactive gradient from white to blue:
Here is the SVG code:
Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <defs> <radialGradient id="grad1" cx="20%" cy="30%" r="30%" fx="50%" fy="50%"> <stop offset="0%" style="stop-color:rgb(255,255,255); stop-opacity:0" /> <stop offset="100%" style="stop-color:rgb(0,0,255);stop-opacity:1" /> radialGradient> defs> <ellipse cx="200" cy="70" rx="85" ry="55" fill="url(#grad1)" /> svg>
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1.18. SVG gradient-radioactivity
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Define a radioactive gradient from white to blue ellipse: Here is the SVG code: Code parsing: Outermost circle defined by CX,CY and r attributes and innermost circle defined by Fx and Fy The gradient color range can consist of two or more colors. Use one for eachcolor Populate the attribute to Another ellipse that defines the radioactive gradient from white to blue: Here is the SVG code: 1.18.2. Example 1 ¶
Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <defs> <radialGradient id="grad1" cx="50%" cy="50%" r="50%" fx="50%" fy="50%"> <stop offset="0%" style="stop-color:rgb(255,255,255); stop-opacity:0" /> <stop offset="100%" style="stop-color:rgb(0,0,255);stop-opacity:1" /> radialGradient> defs> <ellipse cx="200" cy="70" rx="85" ry="55" fill="url(#grad1)" /> svg>
offset property is used to define the start and end of a gradient ellipse elements are linked to this gradient 1.18.3. Example 2 ¶
Example ¶
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <defs> <radialGradient id="grad1" cx="20%" cy="30%" r="30%" fx="50%" fy="50%"> <stop offset="0%" style="stop-color:rgb(255,255,255); stop-opacity:0" /> <stop offset="100%" style="stop-color:rgb(0,0,255);stop-opacity:1" /> radialGradient> defs> <ellipse cx="200" cy="70" rx="85" ry="55" fill="url(#grad1)" /> svg>