文字

CairoContext::clipExtents

cairo_clip_extents

(PECL cairo >= 0.1.0)

CairoContext::clipExtents -- cairo_clip_extentsComputes the area inside the current clip

说明

面向对象风格 (method):

public array CairoContext::clipExtents ( void )

过程化风格:

array cairo_clip_extents ( CairoContext $context )

Computes a bounding box in user coordinates covering the area inside the current clip.

参数

context

A valid CairoContext object

返回值

An array containing the (float)x1, (float)y1, (float)x2, (float)y2, coordinates covering the area inside the current clip

范例

Example #1 面向对象风格

<?php

$surface 
= new  CairoImageSurface ( CairoFormat :: ARGB32 50 50 );

$context  = new  CairoContext ( $surface );

var_dump ( $context -> clipExtents ());
?>

以上例程的输出类似于:

array(4) {
  [0]=>
  float(0)
  [1]=>
  float(0)
  [2]=>
  float(50)
  [3]=>
  float(50)
}

Example #2 过程化风格

<?php

$surface 
cairo_image_surface_create ( CAIRO_FORMAT_ARGB32 50 50 );

$context  cairo_create ( $surface );

var_dump ( cairo_clip_extents ( $context ));

?>

以上例程的输出类似于:

array(4) {
  [0]=>
  float(0)
  [1]=>
  float(0)
  [2]=>
  float(50)
  [3]=>
  float(50)
}

参见

  • CairoContext::clip() - Establishes a new clip region
上一篇: 下一篇: