CairoContext
PHP Manual

CairoContext::arcNegative

cairo_arc_negative

(PECL cairo >= 0.1.0)

CairoContext::arcNegative -- cairo_arc_negativeAdds a negative arc

Description

Object oriented style (method):

public void CairoContext::arcNegative ( float $x , float $y , float $radius , float $angle1 , float $angle2 )

Procedural style:

void cairo_arc_negative ( CairoContext $context , float $x , float $y , float $radius , float $angle1 , float $angle2 )

Adds a circular arc of the given radius to the current path. The arc is centered at (x , y ), begins at angle1 and proceeds in the direction of decreasing angles to end at angle2 . If angle2 is greater than angle1 it will be progressively decreased by 2*M_PI until it is less than angle1 . See CairoContext::arc or cairo_arc() for more details. This function differs only in the direction of the arc between the two angles.

Parameters

context

A valid CairoContext object

x

double x position

y

double y position

radius

The radius of the desired negative arc

angle1

Start angle of the arc

angle2

End angle of the arc

Return Values

No value is returned.

Examples

Example #1 Object oriented style

<?php

$s 
= new CairoImageSurface(CairoFormat::ARGB32100100);
$c = new CairoContext($s);

$c->setSourceRgb(000);
$c->paint();

$c->setLineWidth(1);
$c->setSourceRgb(111);

for (
$r 50$r 0$r -= 10) {
 
$c->arcNegative(5050$rM_PI0);
 
$c->stroke();
 
$c->fill();
}

$s->writeToPng(dirname(__FILE__) . '/CairoContext__arcNegative.png');
?>

Example #2 Procedural style

<?php

$s 
cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE100100);
$c cairo_create($s);

cairo_set_source_rgb($c000);
cairo_paint($c);

cairo_set_source_rgb($c111);
cairo_set_line_width($c1);

for (
$r 50$r 0$r -= 10) {
 
cairo_arc_negative($c5050$rM_PI0);
 
cairo_stroke($c);
 
cairo_fill($c);
}

cairo_surface_write_to_png($sdirname(__FILE__) . '/cairo_arc_negative.png');
?>

See Also


CairoContext
PHP Manual