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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
commit | 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 (patch) | |
tree | a9ef8ac1e1b8fe4207b6d64d3841bfb8990b6fd0 /files/vi/web/css/transform-function/perspective()/index.html | |
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diff --git a/files/vi/web/css/transform-function/perspective()/index.html b/files/vi/web/css/transform-function/perspective()/index.html new file mode 100644 index 0000000000..a69e46e094 --- /dev/null +++ b/files/vi/web/css/transform-function/perspective()/index.html @@ -0,0 +1,153 @@ +--- +title: perspective() +slug: Web/CSS/transform-function/perspective() +translation_of: Web/CSS/transform-function/perspective() +--- +<div>{{CSSRef}}</div> + +<p>The <strong><code>perspective()</code></strong> <a href="/en-US/docs/Web/CSS">CSS</a> function defines a transformation that sets the distance between the user and the z=0 plane, the perspective from which the viewer would be if the 2-dimensional interface were 3-dimensional. Its result is a {{cssxref("<transform-function>")}} data type.</p> + +<div>{{EmbedInteractiveExample("pages/css/function-perspective.html")}}</div> + + + +<p>The <code>perspective()</code> transform function is part of the {{cssxref('transform')}} value applied on the element being transformed. This differs from the {{cssxref('perspective')}} and {{cssxref('perspective-origin')}} properties which are attached to the parent of a child transformed in 3-dimensional space.</p> + +<h2 id="Syntax">Syntax</h2> + +<p>The perspective distance used by <code>perspective()</code> is specified by a {{cssxref("<length>")}} value, which represents the distance between the user and the z=0 plane. The z=0 plane is the plane where everything appears in a 2-dimensional view, or the screen. A positive value makes the element appear closer to the user than the rest of the interface, a negative value farther. The greater the value, the further away the perspective of the user is.</p> + +<pre class="syntaxbox">perspective(d) +</pre> + +<h3 id="Values">Values</h3> + +<dl> + <dt><var>d</var></dt> + <dd>Is a {{cssxref("<length>")}} representing the distance from the user to the z=0 plane. If it is 0 or a negative value, no perspective transform is applied.</dd> +</dl> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Cartesian coordinates on ℝ<sup>2</sup></th> + <th scope="col">Homogeneous coordinates on ℝℙ<sup>2</sup></th> + <th scope="col">Cartesian coordinates on ℝ<sup>3</sup></th> + <th scope="col">Homogeneous coordinates on ℝℙ<sup>3</sup></th> + </tr> + </thead> + <tbody> + <tr> + <td colspan="2" rowspan="2"> + <p>This transformation applies to the 3D space and can't be represented on the plane.</p> + </td> + <td colspan="1" rowspan="2">This transformation is not a linear transformation in ℝ<sup>3</sup>, and can't be represented using a Cartesian-coordinate matrix.</td> + <td colspan="1" rowspan="2"><math> <mfenced><mtable><mtr>1<mtd>0</mtd><mtd>0</mtd><mtd>0</mtd></mtr><mtr>0<mtd>1</mtd><mtd>0</mtd><mtd>0</mtd></mtr><mtr><mtd>0</mtd><mtd>0</mtd><mtd>1</mtd><mtd>0</mtd></mtr><mtr><mtd>0</mtd><mtd>0</mtd><mtd><mo>−</mo>1<mo>/</mo>d</mtd><mtd>1</mtd></mtr></mtable> </mfenced> </math></td> + </tr> + </tbody> +</table> + +<h2 id="Examples">Examples</h2> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html"><p>Without perspective:</p> +<div class="no-perspective-box"> + <div class="face front">A</div> + <div class="face top">B</div> + <div class="face left">C</div> +</div> + +<p>With perspective (9cm):</p> +<div class="perspective-box-far"> + <div class="face front">A</div> + <div class="face top">B</div> + <div class="face left">C</div> +</div> + +<p>With perspective (4cm):</p> +<div class="perspective-box-closer"> + <div class="face front">A</div> + <div class="face top">B</div> + <div class="face left">C</div> +</div> +</pre> + +<h3 id="CSS">CSS</h3> + +<pre class="brush: css">.face { + position: absolute; + width: 100px; + height: 100px; + line-height: 100px; + font-size: 100px; + text-align: center; +} + +p + div { + width: 100px; + height: 100px; + transform-style: preserve-3d; + margin-left: 100px; +} +.no-perspective-box { + transform: rotateX(-15deg) rotateY(30deg); +} + +.perspective-box-far { + transform: perspective(9cm) rotateX(-15deg) rotateY(30deg); +} + +.perspective-box-closer { + transform: perspective(4cm) rotateX(-15deg) rotateY(30deg); +} + +.top { + background-color: skyblue; + transform: rotateX(90deg) translate3d(0, 0, 50px); +} + +.left { + background-color: pink; + transform: rotateY(-90deg) translate3d(0, 0, 50px); +} + +.front { + background-color: limegreen; + transform: translate3d(0, 0, 50px); +} +</pre> + +<h3 id="Result">Result</h3> + +<p>{{ EmbedLiveSample('Examples', '250', '350') }}</p> + +<h2 id="Specifications">Specifications</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName("CSS Transforms 2", "#funcdef-perspective", "perspective()")}}</td> + <td>{{Spec2("CSS Transforms 2")}}</td> + <td>Initial definition</td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p>Please see the <code><a href="/en-US/docs/Web/CSS/transform-function#Browser_compatibility"><transform-function></a></code> data type for compatibility info.</p> + +<h2 id="See_also">See also</h2> + +<ul> + <li>{{cssxref("transform")}}</li> + <li>{{cssxref("<transform-function>")}}</li> +</ul> |