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CairoContext::arcNegative

Contents

cairo_arc_negative

(PECL cairo >= 0.1.0)

CairoContext::arcNegative -- cairo_arc_negative — Adds a negative arc

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Description

Object oriented style (method):

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

Procedural style:

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

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.

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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

PHP: CairoContext::arcNegative - Manual Home of Manuel PHP Contents Haut

Return Values

No value is returned.

PHP: CairoContext::arcNegative - Manual Home of Manuel PHP Contents Haut

Examples

Example #1 Object oriented style


<?php

$s = new CairoImageSurface(CairoFormat::ARGB32, 100, 100);
$c = new CairoContext($s);

$c->setSourceRgb(0, 0, 0);
$c->paint();

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

for ($r = 50; $r > 0; $r -= 10) {
 $c->arcNegative(50, 50, $r, 2 * M_PI, 0);
 $c->stroke();
 $c->fill();
}

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

Example #2 Procedural style


<?php

$s = cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE, 100, 100);
$c = cairo_create($s);

cairo_set_source_rgb($c, 0, 0, 0);
cairo_paint($c);

cairo_set_source_rgb($c, 1, 1, 1);
cairo_set_line_width($c, 1);

for ($r = 50; $r > 0; $r -= 10) {
 cairo_arc_negative($c, 50, 50, $r, 2 * M_PI, 0);
 cairo_stroke($c);
 cairo_fill($c);
}

cairo_surface_write_to_png($s, dirname(__FILE__) . '/cairo_arc_negative.png');
?>

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-cairocontext.arcnegative.html

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References

Manuel PHP : http://php.net

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CairoContext::arcNegative