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(PECL cairo >= 0.1.0)
CairoContext::curveTo -- cairo_curve_to — Adds a curve
Object oriented style (method):
Procedural style:
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).
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
Es wird kein Wert zurückgegeben.
Beispiel #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');
?>
Beispiel #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');
?>
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