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)