cairo_arc_negative(3) [php man page]

CAIRO_ARC_NEGATIVE(3)							 1						     CAIRO_ARC_NEGATIVE(3)

CairoContext::arcNegative - Adds a negative arc

       Object oriented style (method):

SYNOPSIS

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

DESCRIPTION

       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(3) for more details. This function differs only in the direction of the arc
       between the two angles.

PARAMETERS

	      o $context
		- A valid CairoContext object

	      o $x
		- double x position

	      o $y
		- double y position

	      o $radius
		- The radius of the desired negative arc

	      o $angle1
		- Start angle of the arc

	      o $angle2
		- End angle of the arc

RETURN VALUES

	No value is returned.

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');
	      ?>

SEE ALSO

       CairoContext::arc.

PHP Documentation Group 												     CAIRO_ARC_NEGATIVE(3)

Check Out this Related Man Page

CAIRO_CLIP(3)								 1							     CAIRO_CLIP(3)

CairoContext::clip - Establishes a new clip region

       Object oriented style (method):

SYNOPSIS

       public void CairoContext::clip (void  )

DESCRIPTION

       Procedural style:
       void cairo_clip (CairoContext  $context)

	Establishes a new clip region by intersecting the current clip region with the current path as it would be filled by CairoContext::fill or
       cairo_fill(3) and according to the current fill rule (see CairoContext::setFillRule or cairo_set_fill_rule(3)).

	After CairoContext::clip or cairo_clip(3), the current path will be cleared from the cairo 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::clip  or  cairo_clip(3)	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::clip  or  cairo_clip(3)  within  a
       CairoContext::save/  CairoContext::restore  or cairo_save(3)/cairo_restore(3) pair. The only other means of increasing the size of the clip
       region is CairoContext::resetClip or procedural cairo_reset_clip(3).

PARAMETERS

	      o $context
		- A valid CairoContext object

RETURN VALUES

	No value is returned.

EXAMPLES

       Example #1

	      Object oriented style

	      <?php

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

	      $context = new CairoContext($surface);

	      $context->clip();

	      ?>

       Example #2

	      Procedural style

	      <?php

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

	      $context = cairo_create($surface);

	      cairo_clip($context);

	      ?>

SEE ALSO

       CairoContext::resetClip, cairo_reset_clip(3).

PHP Documentation Group 													     CAIRO_CLIP(3)

Linux and UNIX Man Pages

cairo_arc_negative(3) [php man page]

Check Out this Related Man Page