(PECL cairo >= 0.1.0)
CairoContext::curveTo -- cairo_curve_to — Adds a curve
Styl obiektowy (method):
$x1
, float $y1
, float $x2
, float $y2
, float $x3
, float $y3
)Styl proceduralny:
$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).
context
A valid CairoContext object created with CairoContext::__construct() or cairo_create()
x1
First control point in the x axis for the curve
y1
First control point in the y axis for the curve
x2
Second control point in x axis for the curve
y2
Second control point in y axis for the curve
x3
Final point in the x axis for the curve
y3
Final point in the y axis for the curve
Nie jest zwracana żadna wartość.
Przykład #1 Styl obiektowy
<?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');
?>
Przykład #2 Styl proceduralny
<?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');
?>