PHP-Handbuch: Establishes a new clip region from the current clip

Beschreibung

Objektorientierter Stil (method):

public void CairoContext::clipPreserve ( void )

Prozeduraler Stil:

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.

Parameter-Liste

context: A valid CairoContext object

Rückgabewerte

Es wird kein Wert zurückgegeben.

Beispiele

Beispiel #1 Objektorientierter Stil


<?php

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

$context = new CairoContext($surface);

$context->clipPreserve();

?>

Beispiel #2 Prozeduraler Stil


<?php

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

$context = cairo_create($surface);

cairo_clip_preserve($context);

?>

Siehe auch

CairoContext::save
CairoContext::restore
CairoContext::resetClip