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#include <cairo.h>
#include "sp-radial-gradient.h"
#include "attributes.h"
#include "xml/repr.h"
#include <2geom/transforms.h>
/*
* Radial Gradient
*/
SPRadialGradient::SPRadialGradient() : SPGradient() {
this->cx.unset(SVGLength::PERCENT, 0.5, 0.5);
this->cy.unset(SVGLength::PERCENT, 0.5, 0.5);
this->r.unset(SVGLength::PERCENT, 0.5, 0.5);
this->fx.unset(SVGLength::PERCENT, 0.5, 0.5);
this->fy.unset(SVGLength::PERCENT, 0.5, 0.5);
this->fr.unset(SVGLength::PERCENT, 0.5, 0.5);
}
SPRadialGradient::~SPRadialGradient() {
}
/**
* Set radial gradient attributes from associated repr.
*/
void SPRadialGradient::build(SPDocument *document, Inkscape::XML::Node *repr) {
SPGradient::build(document, repr);
this->readAttr( "cx" );
this->readAttr( "cy" );
this->readAttr( "r" );
this->readAttr( "fx" );
this->readAttr( "fy" );
this->readAttr( "fr" );
}
/**
* Set radial gradient attribute.
*/
void SPRadialGradient::set(unsigned key, gchar const *value) {
switch (key) {
case SP_ATTR_CX:
if (!this->cx.read(value)) {
this->cx.unset(SVGLength::PERCENT, 0.5, 0.5);
}
if (!this->fx._set) {
this->fx.value = this->cx.value;
this->fx.computed = this->cx.computed;
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SP_ATTR_CY:
if (!this->cy.read(value)) {
this->cy.unset(SVGLength::PERCENT, 0.5, 0.5);
}
if (!this->fy._set) {
this->fy.value = this->cy.value;
this->fy.computed = this->cy.computed;
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SP_ATTR_R:
if (!this->r.read(value)) {
this->r.unset(SVGLength::PERCENT, 0.5, 0.5);
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SP_ATTR_FX:
if (!this->fx.read(value)) {
this->fx.unset(this->cx.unit, this->cx.value, this->cx.computed);
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SP_ATTR_FY:
if (!this->fy.read(value)) {
this->fy.unset(this->cy.unit, this->cy.value, this->cy.computed);
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SP_ATTR_FR:
if (!this->fr.read(value)) {
this->fr.unset(SVGLength::PERCENT, 0.0, 0.0);
}
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
default:
SPGradient::set(key, value);
break;
}
}
/**
* Write radial gradient attributes to associated repr.
*/
Inkscape::XML::Node* SPRadialGradient::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
repr = xml_doc->createElement("svg:radialGradient");
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->cx._set) {
sp_repr_set_svg_double(repr, "cx", this->cx.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->cy._set) {
sp_repr_set_svg_double(repr, "cy", this->cy.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->r._set) {
sp_repr_set_svg_double(repr, "r", this->r.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->fx._set) {
sp_repr_set_svg_double(repr, "fx", this->fx.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->fy._set) {
sp_repr_set_svg_double(repr, "fy", this->fy.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->fr._set) {
sp_repr_set_svg_double(repr, "fr", this->fr.computed);
}
SPGradient::write(xml_doc, repr, flags);
return repr;
}
cairo_pattern_t* SPRadialGradient::pattern_new(cairo_t *ct, Geom::OptRect const &bbox, double opacity) {
this->ensureVector();
Geom::Point focus(this->fx.computed, this->fy.computed);
Geom::Point center(this->cx.computed, this->cy.computed);
double radius = this->r.computed;
double focusr = this->fr.computed;
double scale = 1.0;
double tolerance = cairo_get_tolerance(ct);
// NOTE: SVG2 will allow the use of a focus circle which can
// have its center outside the first circle.
// code below suggested by Cairo devs to overcome tolerance problems
// more: https://bugs.freedesktop.org/show_bug.cgi?id=40918
// Corrected for
// https://bugs.launchpad.net/inkscape/+bug/970355
Geom::Affine gs2user = this->gradientTransform;
if (this->getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX && bbox) {
Geom::Affine bbox2user(bbox->width(), 0, 0, bbox->height(), bbox->left(), bbox->top());
gs2user *= bbox2user;
}
// we need to use vectors with the same direction to represent the transformed
// radius and the focus-center delta, because gs2user might contain non-uniform scaling
Geom::Point d(focus - center);
Geom::Point d_user(d.length(), 0);
Geom::Point r_user(radius, 0);
Geom::Point fr_user(focusr, 0);
d_user *= gs2user.withoutTranslation();
r_user *= gs2user.withoutTranslation();
fr_user *= gs2user.withoutTranslation();
double dx = d_user.x(), dy = d_user.y();
cairo_user_to_device_distance(ct, &dx, &dy);
// compute the tolerance distance in user space
// create a vector with the same direction as the transformed d,
// with the length equal to tolerance
double dl = hypot(dx, dy);
double tx = tolerance * dx / dl, ty = tolerance * dy / dl;
cairo_device_to_user_distance(ct, &tx, &ty);
double tolerance_user = hypot(tx, ty);
if (d_user.length() + tolerance_user > r_user.length()) {
scale = r_user.length() / d_user.length();
// nudge the focus slightly inside
scale *= 1.0 - 2.0 * tolerance / dl;
}
cairo_pattern_t *cp = cairo_pattern_create_radial(
scale * d.x() + center.x(), scale * d.y() + center.y(), focusr,
center.x(), center.y(), radius);
sp_gradient_pattern_common_setup(cp, this, bbox, opacity);
return cp;
}
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