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。
8.8.1. CSS3 text effect ¶
Several new text features are included in CSS3.
In this chapter, you will learn about the following text properties:
Text-shadow
Box-shadow
Text-overflow
Word-wrap
Word-break
8.8.2. Browser support ¶
Attribute | |||||
|---|---|---|---|---|---|
Text-shadow | 4.0 | 10.0 | 3.5 | 4.0 | 9.5 |
Box-shadow | 10.04.0-webkit- | 9.0 | 4.03.5-moz- | 5.1 3.1-webkit- | 10.5 |
Text-overflow | 4.0 | 6.0 | 7.0 | 3.1 | 11.09.0-o- |
Word-wrap | 23.0 | 5.5 | 3.5 | 6.1 | 12.1 |
Word-break | 4.0 | 5.5 | 15.0 | 3.1 | 15.0 |
8.8.3. Text Shadow of CSS3 ¶
In CSS3 text-shadow property applies to text shadows.

You specified horizontal shadows, vertical shadows, blurred distances, and the color of shadows: Add shadows to the title:Example ¶
h1 { text-shadow: 5px 5px 5px #FF0000; }
8.8.4. CSS3 box-shadow attribute ¶
CSS3 in CSS3 box-shadow property applies to box shadowsExample ¶
div { box-shadow: 10px 10px 5px #888888; }
8.8.5. Next, add color to the shadow. ¶
Example:
div { box-shadow: 10px 10px grey; } 8.8.6. Next, add a blur effect to the shadow ¶
Example ¶
div { box-shadow: 10px 10px 5px grey; } 8.8.7. You can also add shadow effects to:: before and:: after pseudo elements ¶
Example ¶
#boxshadow { position: relative; b ox-shadow: 1px 2px 4px rgba(0, 0, 0, .5); pa dding: 10px; bac kground: white; } #boxshadow img { width: 100%; border: 1px solid #8a4419; border-style: inset; } #boxshadow::after { content: ''; position: absolute; z-index: -1; /* hide shadow behind image */ box-shadow: 0 15px 20px rgba(0, 0, 0, 0.3); width: 70%; left: 15%; /* one half of the remaining 30% */ height: 100px; bottom: 0; } 8.8.8. A special case for the use of shadows is the card effect ¶
Example ¶
div.card { width: 250px; box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19); text-align: center; } 8.8.9. CSS3 Text Overflow attribute ¶
The CSS3 text overflow property specifies how the overflow content should bedisplayed to the userExample ¶
p.test1 { white-space: nowrap; width: 200px; border: 1px solid #000000; overflow: hidden; text-overflow: clip; } p.test2 { white-space: nowrap; width: 200px; border: 1px solid #000000; overflow: hidden; text-overflow: ellipsis; }
8.8.10. Line feeds of CSS3 ¶
If a word is too long to fit in an area, it extends to the outside:
In CSS3, the auto-wrap attribute allows you to force text wrapping-even if it means splitting a word in the middle of it:
The CSS code is as follows: Allow long text to wrap:Example ¶
p{word-wrap:break-word;}
8.8.11. CSS3 word splitting and newline ¶
The CSS3 word split newline property specifies the newline rule:
The CSS code is as follows:Example ¶
p.test1 { word-break: keep-all; } p.test2 { word-break: break-all; }
8.8.12. New text Properties ¶
Attribute | Description | CSS |
|---|---|---|
Hanging-punctuation | Specifies whether the punctuation character is outside the wireframe. | 3 |
Punctuation-trim | Specifies whether punctuation characters are trimmed. | 3 |
Text-align-last | Sets how to align the last line or the line immediately before the forced newline character. | 3 |
Text-emphasis | Applies the accent tag and the foreground color of the accent tag to the element’s text. | 3 |
Text-justify | Specifies the alignment method to be used when text-align is set to justify. | 3 |
Text-outline | Specifies the outline of the text. | 3 |
Text-overflow | Specifies what happens when a text overflow contains an element. | 3 |
Text-shadow | Add shadows to the text. | 3 |
Text-wrap | Specifies the line wrapping rules for the text. | 3 |
Word-break | Stipulate the line wrapping rules for non-Chinese, Japanese and Korean texts. | 3 |
Word-wrap | Allows you to split long, indivisible words and wrap them to the next line. | 3 |