cairo_arc(3) [php man page]

CAIRO_ARC(3)								 1							      CAIRO_ARC(3)

CairoContext::arc - Adds a circular arc

       Object oriented style (method):

SYNOPSIS

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

DESCRIPTION

       Procedural style:
       void cairo_arc (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 direc-
       tion of increasing angles to end at $angle2. If $angle2 is less than $angle1 it will be progressively  increased  by  2*M_PI  until  it	is
       greater	than  $angle1.	If there is a current point, an initial line segment will be added to the path to connect the current point to the
       beginning of the arc.  If  this	initial  line  is  undesired,  it  can	be  avoided  by  calling  CairoContext::newSubPath  or	procedural
       cairo_new_sub_path(3) before calling CairoContext::arc or cairo_arc(3). Angles are measured in radians. An angle of 0.0 is in the direction
       of the positive X axis (in user space). An angle of M_PI/2.0 radians (90 degrees) is in the direction of  the  positive	Y  axis  (in  user
       space).	Angles	increase  in the direction from the positive X axis toward the positive Y axis. So with the default transformation matrix,
       angles increase in a clockwise direction. (To convert from degrees to radians, use degrees * (M_PI / 180.).) This function gives the arc in
       the  direction  of  increasing angles; see CairoContext::arcNegative or cairo_arc_negative(3) to get the arc in the direction of decreasing
       angles.

PARAMETERS

	      o $context
		- A valid CairoContext object

	      o $x
		- x position

	      o $y
		- y position

	      o $radius
		- Radius of the arc

	      o $angle1
		- start angle

	      o $angle2
		- end angle

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->arc(50, 50, $r, 0, 2 * M_PI);
	       $c->stroke();
	       $c->fill();
	      }

	      $s->writeToPng(dirname(__FILE__) . '/CairoContext__arc.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; $r -= 10) {
	       cairo_arc($c, 50, 50, $r, 0, 2 * M_PI);
	       cairo_stroke($c);
	       cairo_fill($c);
	      }

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

SEE ALSO

       CairoContext::arcNegative.

PHP Documentation Group 													      CAIRO_ARC(3)

Check Out this Related Man Page

CAIRO_CURVE_TO(3)							 1							 CAIRO_CURVE_TO(3)

CairoContext::curveTo - Adds a curve

       Object oriented style (method):

SYNOPSIS

       public void CairoContext::curveTo (float  $x1, float  $y1, float  $x2, float  $y2, float  $x3, float  $y3)

DESCRIPTION

       Procedural style:
       void cairo_curve_to (CairoContext  $context, float  $x1, float  $y1, float  $x2, float  $y2, float  $x3, float  $y3)

	Adds  a cubic Bezier spline to the path from the current point to position $x3 ,$y3 in user-space coordinates, using $x1, $y1 and $x2, $y2
       as the control points. After this call the current point will be $x3, $y3.

	If there is no current point before the call to CairoContext::curveTo this function will behave as if preceded	by  a  call  to  CairoCon-
       text::moveTo ($x1, $y1).

PARAMETERS

	      o $context
		- A valid CairoContext object created with CairoContext::__construct or cairo_create(3)

	      o $x1
		- First control point in the x axis for the curve

	      o $y1
		- First control point in the y axis for the curve

	      o $x2
		- Second control point in x axis for the curve

	      o $y2
		- Second control point in y axis for the curve

	      o $x3
		- Final point in the x axis for the curve

	      o $y3
		- Final point in the y axis for the curve

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->moveTo(10, 50);
	      $c->setLineWidth(5);
	      $c->setSourceRgb(.1, 0, 1);
	      $c->curveTo(20, 80, 80, 20, 90, 50);
	      $c->stroke();

	      $s->writeToPng(dirname(__FILE__) . '/curveTo.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_move_to($c, 10, 50);
	      cairo_set_line_width($c, 5);
	      cairo_set_source_rgb($c, .1, 0, 1);
	      cairo_curve_to($c, 20, 80, 80, 20, 90, 50);
	      cairo_stroke($c);

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

SEE ALSO

       CairoContext::moveTo.

PHP Documentation Group 													 CAIRO_CURVE_TO(3)

Linux and UNIX Man Pages

cairo_arc(3) [php man page]

Check Out this Related Man Page