update : 2015.11.03
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Establishes a new clip region from the current clip
CairoContext
PHP Manual

CairoContext::clipPreserve

cairo_clip_preserve

(PECL cairo >= 0.1.0)

CairoContext::clipPreserve -- cairo_clip_preserve — Establishes a new clip region from the current clip

설명

객체 기반 형식 (method):

public void CairoContext::clipPreserve ( void )

절차식 형식:

void cairo_clip_preserve ( CairoContext $context )

Establishes a new clip region by intersecting the current clip region with the current path as it would be filled by Context.fill() and according to the current FILL RULE (see CairoContext::setFillRule() or cairo_set_fill_rule()).

Unlike CairoContext::clip(), CairoContext::clipPreserve() preserves the path within the Context. The current clip region affects all drawing operations by effectively masking out any changes to the surface that are outside the current clip region.

Calling CairoContext::clipPreserve() can only make the clip region smaller, never larger. But the current clip is part of the graphics state, so a temporary restriction of the clip region can be achieved by calling CairoContext::clipPreserve() within a CairoContext::save()/CairoContext::restore() pair. The only other means of increasing the size of the clip region is CairoContext::resetClip().

인수

context

A valid CairoContext object

반환값

값을 반환하지 않습니다.

예제

Example #1 객체 기반 형식

<?php

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

$context = new CairoContext($surface);

$context->clipPreserve();

?>

Example #2 절차식 형식

<?php

$surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 50, 50);

$context = cairo_create($surface);

cairo_clip_preserve($context);

?>

참고

CairoContext
PHP Manual