CairoContext::curveTo

(PECL cairo >= 0.1.0)

Adds a curve

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

Object oriented style (method):

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 CairoContext::moveTo() (x1, y1).

Parameters:

context

A valid CairoContext object created with CairoContext::__construct() or cairo_create()

First control point in the x axis for the curve

First control point in the y axis for the curve

Second control point in x axis for the curve

Second control point in y axis for the curve

Final point in the x axis for the curve

Final point in the y axis for the curve

Returns:

No value is returned.

Examples:

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');
?>

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');
?>