CairoContext::clipExtents()

(PECL cairo >= 0.1.0)

Computes the area inside the current clip

说明

面向对象风格(method):

publicCairoContext::clipExtents(void): array

过程化风格:

cairo_clip_extents(CairoContext$context): array

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