[edit] Last updated: Fri, 23 Mar 2012

CairoContext::clipPreserve

cairo_clip_preserve

(PECL cairo >= 0.1.0)

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

Açıklama

Nesne yönelimli kullanım (method):

public void CairoContext::clipPreserve ( void )

Yordamsal kullanım:

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().

Değiştirgeler

context: A valid CairoContext object

Dönen Değerler

Hiçbir değer dönmez.

Örnekler

Örnek 1 Nesne yönelimli kullanım


<?php

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

$context = new CairoContext($surface);

$context->clipPreserve();

?>

Örnek 2 Yordamsal kullanım


<?php

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

$context = cairo_create($surface);

cairo_clip_preserve($context);

?>

Ayrıca Bakınız

CairoContext::save() - The save purpose
CairoContext::restore() - The restore purpose
CairoContext::resetClip() - The resetClip purpose

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