[edit] Last updated: Fri, 17 May 2013

CairoContext::clipPreserve

cairo_clip_preserve

(PECL cairo >= 0.1.0)

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

Descrizione

Stile orientato agli oggetti (method):

public void CairoContext::clipPreserve ( void )

Stile procedurale:

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().

Elenco dei parametri

context: A valid CairoContext object

Valori restituiti

Nessun valore viene restituito.

Esempi

Example #1 Stile orientato agli oggetti


<?php

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

$context = new CairoContext($surface);

$context->clipPreserve();

?>

Example #2 Stile procedurale


<?php

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

$context = cairo_create($surface);

cairo_clip_preserve($context);

?>

Vedere anche:

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

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