gradient-chemistry.cpp revision 96d6bc601d13d7b733fbd67725bcc3e83fb96e24
#define __SP_GRADIENT_CHEMISTRY_C__
/*
* Various utility methods for gradients
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* bulia byak
* Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
*
* Copyright (C) 2007 Johan Engelen
* Copyright (C) 2001-2005 authors
* Copyright (C) 2001 Ximian, Inc.
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "style.h"
#include "document-private.h"
#include "desktop-style.h"
#include "sp-gradient-reference.h"
#include "sp-gradient-vector.h"
#include "sp-linear-gradient.h"
#include "sp-radial-gradient.h"
#include "sp-stop.h"
#include "widgets/gradient-vector.h"
#include "sp-text.h"
#include "sp-tspan.h"
#include <libnr/nr-matrix-fns.h>
#include "xml/repr.h"
#include "svg/svg.h"
#include "svg/svg-color.h"
// Terminology:
//
// "vector" is a gradient that has stops but not position coords. It can be referenced by one or
// more privates. Objects should not refer to it directly. It has no radial/linear distinction.
//
// "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
// radial). It references a vector for the actual colors. Each private is only used by one
// object. It is either linear or radial.
static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
SPGradient *
sp_gradient_ensure_vector_normalized(SPGradient *gr)
{
g_return_val_if_fail(gr != NULL, NULL);
g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
/* If we are already normalized vector, just return */
if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
/* Fail, if we have wrong state set */
if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
return NULL;
}
/* First make sure we have vector directly defined (i.e. gr has its own stops) */
if (!gr->has_stops) {
/* We do not have stops ourselves, so flatten stops as well */
sp_gradient_ensure_vector(gr);
g_assert(gr->vector.built);
// this adds stops from gr->vector as children to gr
sp_gradient_repr_write_vector (gr);
}
/* If gr hrefs some other gradient, remove the href */
if (gr->ref->getObject()) {
/* We are hrefing someone, so require flattening */
SP_OBJECT(gr)->updateRepr(((SPObject *) gr)->repr, SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
}
/* Everything is OK, set state flag */
gr->state = SP_GRADIENT_STATE_VECTOR;
return gr;
}
/**
* Creates new private gradient for the given vector
*/
static SPGradient *
sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
{
g_return_val_if_fail(document != NULL, NULL);
g_return_val_if_fail(vector != NULL, NULL);
g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
// create a new private gradient of the requested type
Inkscape::XML::Node *repr;
if (type == SP_GRADIENT_TYPE_LINEAR) {
repr = xml_doc->createElement("svg:linearGradient");
} else {
repr = xml_doc->createElement("svg:radialGradient");
}
// privates are garbage-collectable
repr->setAttribute("inkscape:collect", "always");
// link to vector
sp_gradient_repr_set_link(repr, vector);
/* Append the new private gradient to defs */
SP_OBJECT_REPR(defs)->appendChild(repr);
Inkscape::GC::release(repr);
// get corresponding object
SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
g_assert(gr != NULL);
g_assert(SP_IS_GRADIENT(gr));
return gr;
}
/**
Count how many times gr is used by the styles of o and its descendants
*/
guint
count_gradient_hrefs(SPObject *o, SPGradient *gr)
{
if (!o)
return 1;
guint i = 0;
SPStyle *style = SP_OBJECT_STYLE(o);
if (style
&& style->fill.type == SP_PAINT_TYPE_PAINTSERVER
&& SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
&& SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
{
i ++;
}
if (style
&& style->stroke.type == SP_PAINT_TYPE_PAINTSERVER
&& SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
&& SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
{
i ++;
}
for (SPObject *child = sp_object_first_child(o);
child != NULL; child = SP_OBJECT_NEXT(child)) {
i += count_gradient_hrefs(child, gr);
}
return i;
}
/**
* If gr has other users, create a new private; also check if gr links to vector, relink if not
*/
SPGradient *
sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
SPGradientType type, SPObject *o)
{
g_return_val_if_fail(gr != NULL, NULL);
g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
// Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
// but i think we should not abort on this - maybe just write a validity warning into some sort
// of log
if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
return (gr);
// user is the object that uses this gradient; normally it's item but for tspans, we
// check its ancestor text so that tspans don't get different gradients from their
// texts.
SPObject *user = o;
while (SP_IS_TSPAN(user)) {
user = SP_OBJECT_PARENT(user);
}
// Check the number of uses of the gradient within this object;
// if we are private and there are no other users,
if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
// check vector
if ( gr != vector && gr->ref->getObject() != vector ) {
/* our href is not the vector, and vector is different from gr; relink */
sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
}
return gr;
}
SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
SPObject *defs = SP_DOCUMENT_DEFS(doc);
if ((gr->has_stops) ||
(gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
(SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
(SP_OBJECT_HREFCOUNT(gr) > 1)) {
// we have to clone a fresh new private gradient for the given vector
// create an empty one
SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
// copy all the attributes to it
Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
if (SP_IS_RADIALGRADIENT(gr)) {
repr_new->setAttribute("cx", repr->attribute("cx"));
repr_new->setAttribute("cy", repr->attribute("cy"));
repr_new->setAttribute("fx", repr->attribute("fx"));
repr_new->setAttribute("fy", repr->attribute("fy"));
repr_new->setAttribute("r", repr->attribute("r"));
} else {
repr_new->setAttribute("x1", repr->attribute("x1"));
repr_new->setAttribute("y1", repr->attribute("y1"));
repr_new->setAttribute("x2", repr->attribute("x2"));
repr_new->setAttribute("y2", repr->attribute("y2"));
}
return gr_new;
} else {
return gr;
}
}
SPGradient *
sp_gradient_fork_vector_if_necessary (SPGradient *gr)
{
if (SP_OBJECT_HREFCOUNT(gr) > 1) {
SPDocument *document = SP_OBJECT_DOCUMENT(gr);
Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate();
SP_OBJECT_REPR (SP_DOCUMENT_DEFS (document))->addChild(repr, NULL);
SPGradient *gr_new = (SPGradient *) document->getObjectByRepr(repr);
gr_new = sp_gradient_ensure_vector_normalized (gr_new);
Inkscape::GC::release(repr);
return gr_new;
}
return gr;
}
/**
* Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
* instead. No forking or reapplying is done because this is only called for newly created privates.
* @return The new gradient.
*/
SPGradient *
sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
{
Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
// calculate the bbox of the item
sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
g_assert( bbox );
NR::Coord const width = bbox->dimensions()[NR::X];
NR::Coord const height = bbox->dimensions()[NR::Y];
NR::Point const center = bbox->midpoint();
if (SP_IS_RADIALGRADIENT(gr)) {
sp_repr_set_svg_double(repr, "cx", center[NR::X]);
sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
sp_repr_set_svg_double(repr, "fx", center[NR::X]);
sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
sp_repr_set_svg_double(repr, "r", width/2);
// we want it to be elliptic, not circular
NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
NR::Matrix (NR::scale(1, height/width)) *
NR::Matrix (NR::translate (center));
gr->gradientTransform = squeeze;
{
gchar *c=sp_svg_transform_write(gr->gradientTransform);
SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
g_free(c);
}
} else {
sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
}
// set the gradientUnits
repr->setAttribute("gradientUnits", "userSpaceOnUse");
return gr;
}
/**
* Convert an item's gradient to userspace if necessary, also fork it if necessary.
* @return The new gradient.
*/
SPGradient *
sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
{
g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
// First, fork it if it is shared
gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
// calculate the bbox of the item
sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
NR::Matrix bbox2user;
NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
if ( bbox ) {
bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
0, bbox->dimensions()[NR::Y],
bbox->min()[NR::X], bbox->min()[NR::Y]);
} else {
// would be degenerate otherwise
bbox2user = NR::identity();
}
/* skew is the additional transform, defined by the proportions of the item, that we need
* to apply to the gradient in order to work around this weird bit from SVG 1.1
* (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
*
* When gradientUnits="objectBoundingBox" and gradientTransform is the identity
* matrix, the stripes of the linear gradient are perpendicular to the gradient
* vector in object bounding box space (i.e., the abstract coordinate system where
* (0,0) is at the top/left of the object bounding box and (1,1) is at the
* bottom/right of the object bounding box). When the object's bounding box is not
* square, the stripes that are conceptually perpendicular to the gradient vector
* within object bounding box space will render non-perpendicular relative to the
* gradient vector in user space due to application of the non-uniform scaling
* transformation from bounding box space to user space.
*/
NR::Matrix skew = bbox2user;
double exp = skew.expansion();
skew[0] /= exp;
skew[1] /= exp;
skew[2] /= exp;
skew[3] /= exp;
skew[4] = 0;
skew[5] = 0;
// apply skew to the gradient
gr->gradientTransform = skew;
{
gchar *c=sp_svg_transform_write(gr->gradientTransform);
SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
g_free(c);
}
// Matrix to convert points to userspace coords; postmultiply by inverse of skew so
// as to cancel it out when it's applied to the gradient during rendering
NR::Matrix point_convert = bbox2user * skew.inverse();
if (SP_IS_RADIALGRADIENT(gr)) {
SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
// original points in the bbox coords
NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
double r_b = rg->r.computed;
// converted points in userspace coords
NR::Point c_u = c_b * point_convert;
NR::Point f_u = f_b * point_convert;
double r_u = r_b * point_convert.expansion();
sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
sp_repr_set_svg_double(repr, "r", r_u);
} else {
SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
NR::Point p1_u = p1_b * point_convert;
NR::Point p2_u = p2_b * point_convert;
sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
}
// set the gradientUnits
repr->setAttribute("gradientUnits", "userSpaceOnUse");
}
// apply the gradient to the item (may be necessary if we forked it); not recursive
// generally because grouped items will be taken care of later (we're being called
// from sp_item_adjust_paint_recursive); however text and all its children should all
// refer to one gradient, hence the recursive call for text (because we can't/don't
// want to access tspans and set gradients on them separately)
if (SP_IS_TEXT(item))
sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
else
sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
return gr;
}
void
sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
{
if (set) {
gradient->gradientTransform = postmul;
} else {
gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
}
gradient->gradientTransform_set = TRUE;
gchar *c=sp_svg_transform_write(gradient->gradientTransform);
SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
g_free(c);
}
SPGradient *
sp_item_gradient (SPItem *item, bool fill_or_stroke)
{
SPStyle *style = SP_OBJECT_STYLE (item);
SPGradient *gradient = NULL;
if (fill_or_stroke) {
if (style && (style->fill.type == SP_PAINT_TYPE_PAINTSERVER)) {
SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
if (SP_IS_GRADIENT (server)) {
gradient = SP_GRADIENT (server);
}
}
} else {
if (style && (style->stroke.type == SP_PAINT_TYPE_PAINTSERVER)) {
SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
if (SP_IS_GRADIENT (server)) {
gradient = SP_GRADIENT (server);
}
}
}
return gradient;
}
SPStop*
sp_first_stop(SPGradient *gradient)
{
for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
if (SP_IS_STOP (ochild))
return SP_STOP(ochild);
}
return NULL;
}
SPStop*
sp_prev_stop(SPStop *stop, SPGradient *gradient)
{
if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
return NULL;
SPObject *found = NULL;
for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
if (SP_IS_STOP (ochild)) {
found = ochild;
}
if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
break;
}
}
return SP_STOP(found);
}
SPStop*
sp_next_stop(SPStop *stop)
{
for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
if (SP_IS_STOP (ochild))
return SP_STOP(ochild);
}
return NULL;
}
SPStop*
sp_last_stop(SPGradient *gradient)
{
for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
if (sp_next_stop (stop) == NULL)
return stop;
}
return NULL;
}
SPStop*
sp_get_stop_i(SPGradient *gradient, guint stop_i)
{
SPStop *stop = sp_first_stop (gradient);
for (guint i=0; i < stop_i; i++) {
if (!stop) return NULL;
stop = sp_next_stop (stop);
}
return stop;
}
void
sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (!gradient || !SP_IS_GRADIENT(gradient))
return;
SPGradient *vector = sp_gradient_get_vector (gradient, false);
switch (point_type) {
case POINT_LG_BEGIN:
case POINT_RG_CENTER:
case POINT_RG_FOCUS:
{
GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
gtk_widget_show (dialog);
}
break;
case POINT_LG_END:
case POINT_RG_R1:
case POINT_RG_R2:
{
GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
gtk_widget_show (dialog);
}
break;
case POINT_LG_MID:
case POINT_RG_MID1:
case POINT_RG_MID2:
{
GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
gtk_widget_show (dialog);
}
break;
default:
break;
}
}
guint32
sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (!gradient || !SP_IS_GRADIENT(gradient))
return 0;
SPGradient *vector = sp_gradient_get_vector (gradient, false);
if (!vector) // orphan!
return 0; // what else to do?
switch (point_type) {
case POINT_LG_BEGIN:
case POINT_RG_CENTER:
case POINT_RG_FOCUS:
{
SPStop *first = sp_first_stop (vector);
if (first) {
return sp_stop_get_rgba32(first);
}
}
break;
case POINT_LG_END:
case POINT_RG_R1:
case POINT_RG_R2:
{
SPStop *last = sp_last_stop (vector);
if (last) {
return sp_stop_get_rgba32(last);
}
}
break;
case POINT_LG_MID:
case POINT_RG_MID1:
case POINT_RG_MID2:
{
SPStop *stopi = sp_get_stop_i (vector, point_i);
if (stopi) {
return sp_stop_get_rgba32(stopi);
}
}
break;
default:
break;
}
return 0;
}
void
sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (!gradient || !SP_IS_GRADIENT(gradient))
return;
SPGradient *vector = sp_gradient_get_vector (gradient, false);
if (!vector) // orphan!
return;
vector = sp_gradient_fork_vector_if_necessary (vector);
if ( gradient != vector && gradient->ref->getObject() != vector ) {
sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
}
switch (point_type) {
case POINT_LG_BEGIN:
case POINT_RG_CENTER:
case POINT_RG_FOCUS:
{
SPStop *first = sp_first_stop (vector);
if (first) {
sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
}
}
break;
case POINT_LG_END:
case POINT_RG_R1:
case POINT_RG_R2:
{
SPStop *last = sp_last_stop (vector);
if (last) {
sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
}
}
break;
case POINT_LG_MID:
case POINT_RG_MID1:
case POINT_RG_MID2:
{
SPStop *stopi = sp_get_stop_i (vector, point_i);
if (stopi) {
sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
}
}
break;
default:
break;
}
}
void
sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (!gradient || !SP_IS_GRADIENT(gradient))
return;
SPGradient *vector = sp_gradient_get_vector (gradient, false);
if (!vector) // orphan!
return;
vector = sp_gradient_fork_vector_if_necessary (vector);
if ( gradient != vector && gradient->ref->getObject() != vector ) {
sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
}
GSList *child_reprs = NULL;
GSList *child_objects = NULL;
std::vector<double> offsets;
for (SPObject *child = sp_object_first_child(vector);
child != NULL; child = SP_OBJECT_NEXT(child)) {
child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
child_objects = g_slist_prepend (child_objects, child);
offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
}
GSList *child_copies = NULL;
for (GSList *i = child_reprs; i != NULL; i = i->next) {
Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
child_copies = g_slist_append (child_copies, repr->duplicate());
}
for (GSList *i = child_objects; i != NULL; i = i->next) {
SPObject *child = SP_OBJECT (i->data);
child->deleteObject();
}
std::vector<double>::iterator iter = offsets.end() - 1;
for (GSList *i = child_copies; i != NULL; i = i->next) {
Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
vector->appendChildRepr(copy);
sp_repr_set_svg_double (copy, "offset", 1 - *iter);
iter --;
Inkscape::GC::release(copy);
}
g_slist_free (child_reprs);
g_slist_free (child_copies);
g_slist_free (child_objects);
}
// FIXME: make general global function
static double
get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
{
double length = NR::L2(end - begin);
NR::Point be = (end - begin) / length;
double r = NR::dot(p - begin, be);
if (r < 0.0) return 0.0;
if (r > length) return 1.0;
return (r / length);
}
/**
Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
*/
void
sp_item_gradient_set_coords (SPItem *item, guint point_type, guint point_i, NR::Point p_w, bool fill_or_stroke, bool write_repr, bool scale)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (!gradient || !SP_IS_GRADIENT(gradient))
return;
gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
NR::Matrix i2d = sp_item_i2d_affine (item);
NR::Point p = p_w * i2d.inverse();
p *= (gradient->gradientTransform).inverse();
// now p is in gradient's original coordinates
Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
if (SP_IS_LINEARGRADIENT(gradient)) {
SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
switch (point_type) {
case POINT_LG_BEGIN:
if (scale) {
lg->x2.computed += (lg->x1.computed - p[NR::X]);
lg->y2.computed += (lg->y1.computed - p[NR::Y]);
}
lg->x1.computed = p[NR::X];
lg->y1.computed = p[NR::Y];
if (write_repr) {
if (scale) {
sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
}
sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
case POINT_LG_END:
if (scale) {
lg->x1.computed += (lg->x2.computed - p[NR::X]);
lg->y1.computed += (lg->y2.computed - p[NR::Y]);
}
lg->x2.computed = p[NR::X];
lg->y2.computed = p[NR::Y];
if (write_repr) {
if (scale) {
sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
}
sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
case POINT_LG_MID:
{
// using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
SPGradient *vector = sp_gradient_get_vector (lg, false);
lg->vector.stops.at(point_i).offset = offset;
SPStop* stopi = sp_get_stop_i(vector, point_i);
stopi->offset = offset;
if (write_repr) {
sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
}
}
break;
default:
break;
}
} else if (SP_IS_RADIALGRADIENT(gradient)) {
SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
NR::Point c (rg->cx.computed, rg->cy.computed);
NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
// prevent setting a radius too close to the center
return;
}
NR::Matrix new_transform;
bool transform_set = false;
switch (point_type) {
case POINT_RG_CENTER:
rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
rg->cx.computed = p[NR::X];
rg->cy.computed = p[NR::Y];
if (write_repr) {
sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
case POINT_RG_FOCUS:
rg->fx.computed = p[NR::X];
rg->fy.computed = p[NR::Y];
if (write_repr) {
sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
case POINT_RG_R1:
{
NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
double r1_angle = NR::atan2(r1_w - c_w);
double move_angle = NR::atan2(p_w - c_w) - r1_angle;
double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
NR::Matrix (NR::rotate(-r1_angle)) *
NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
NR::Matrix (NR::rotate(r1_angle)) *
NR::Matrix (NR::rotate(move_angle)) *
NR::Matrix (NR::translate (c_w));
new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
transform_set = true;
break;
}
case POINT_RG_R2:
{
NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
double r2_angle = NR::atan2(r2_w - c_w);
double move_angle = NR::atan2(p_w - c_w) - r2_angle;
double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
NR::Matrix (NR::rotate(-r2_angle)) *
NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
NR::Matrix (NR::rotate(r2_angle)) *
NR::Matrix (NR::rotate(move_angle)) *
NR::Matrix (NR::translate (c_w));
new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
transform_set = true;
break;
}
case POINT_RG_MID1:
{
NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
double offset = get_offset_between_points (p, start, end);
SPGradient *vector = sp_gradient_get_vector (rg, false);
rg->vector.stops.at(point_i).offset = offset;
SPStop* stopi = sp_get_stop_i(vector, point_i);
stopi->offset = offset;
if (write_repr) {
sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
}
break;
}
case POINT_RG_MID2:
NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
double offset = get_offset_between_points (p, start, end);
SPGradient *vector = sp_gradient_get_vector (rg, false);
rg->vector.stops.at(point_i).offset = offset;
SPStop* stopi = sp_get_stop_i(vector, point_i);
stopi->offset = offset;
if (write_repr) {
sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
}
break;
}
if (transform_set) {
gradient->gradientTransform = new_transform;
gradient->gradientTransform_set = TRUE;
if (write_repr) {
gchar *s=sp_svg_transform_write(gradient->gradientTransform);
SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
g_free(s);
} else {
SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
}
}
}
SPGradient *
sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (gradient)
return sp_gradient_get_vector (gradient, false);
return NULL;
}
SPGradientSpread
sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
if (gradient)
return sp_gradient_get_spread (gradient);
return SP_GRADIENT_SPREAD_PAD;
}
/**
Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
in desktop coordinates.
*/
NR::Point
sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
{
SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
NR::Point p (0, 0);
if (!gradient)
return p;
if (SP_IS_LINEARGRADIENT(gradient)) {
SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
switch (point_type) {
case POINT_LG_BEGIN:
p = NR::Point (lg->x1.computed, lg->y1.computed);
break;
case POINT_LG_END:
p = NR::Point (lg->x2.computed, lg->y2.computed);
break;
case POINT_LG_MID:
{
gdouble offset = lg->vector.stops.at(point_i).offset;
p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
}
break;
}
} else if (SP_IS_RADIALGRADIENT(gradient)) {
SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
switch (point_type) {
case POINT_RG_CENTER:
p = NR::Point (rg->cx.computed, rg->cy.computed);
break;
case POINT_RG_FOCUS:
p = NR::Point (rg->fx.computed, rg->fy.computed);
break;
case POINT_RG_R1:
p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
break;
case POINT_RG_R2:
p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
break;
case POINT_RG_MID1:
{
gdouble offset = rg->vector.stops.at(point_i).offset;
p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
}
break;
case POINT_RG_MID2:
{
gdouble offset = rg->vector.stops.at(point_i).offset;
p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
}
break;
}
}
if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
if (bbox) {
p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
0, bbox->dimensions()[NR::Y],
bbox->min()[NR::X], bbox->min()[NR::Y]);
}
}
p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
return p;
}
/**
* Sets item fill or stroke to the gradient of the specified type with given vector, creating
* new private gradient, if needed.
* gr has to be a normalized vector.
*/
SPGradient *
sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
{
g_return_val_if_fail(item != NULL, NULL);
g_return_val_if_fail(SP_IS_ITEM(item), NULL);
g_return_val_if_fail(gr != NULL, NULL);
g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
SPStyle *style = SP_OBJECT_STYLE(item);
g_assert(style != NULL);
guint style_type = is_fill? style->fill.type : style->stroke.type;
SPPaintServer *ps = NULL;
if (style_type == SP_PAINT_TYPE_PAINTSERVER)
ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
if (ps
&& ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
(type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
{
/* Current fill style is the gradient of the required type */
SPGradient *current = SP_GRADIENT(ps);
//g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
if (SP_OBJECT_HREFCOUNT(current) == 1 ||
SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
// current is private and it's either used once, or all its uses are by children of item;
// so just change its href to vector
if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
/* href is not the vector */
sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
}
SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
return current;
} else {
// the gradient is not private, or it is shared with someone else;
// normalize it (this includes creating new private if necessary)
SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
g_return_val_if_fail(normalized != NULL, NULL);
if (normalized != current) {
/* We have to change object style here; recursive because this is used from
* fill&stroke and must work for groups etc. */
sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
}
SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
return normalized;
}
} else {
/* Current fill style is not a gradient or wrong type, so construct everything */
SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
constructed = sp_gradient_reset_to_userspace(constructed, item);
sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
SP_OBJECT_STYLE_MODIFIED_FLAG ));
return constructed;
}
}
static void
sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
{
g_return_if_fail(repr != NULL);
g_return_if_fail(link != NULL);
g_return_if_fail(SP_IS_GRADIENT(link));
gchar *ref;
if (link) {
gchar const *id = SP_OBJECT_ID(link);
size_t const len = strlen(id);
ref = (gchar*) alloca(len + 2);
*ref = '#';
memcpy(ref + 1, id, len + 1);
} else {
ref = NULL;
}
repr->setAttribute("xlink:href", ref);
}
/*
* Get default normalized gradient vector of document, create if there is none
*/
SPGradient *
sp_document_default_gradient_vector(SPDocument *document, guint32 color)
{
SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
repr->setAttribute("inkscape:collect", "always");
// set here, but removed when it's edited in the gradient editor
// to further reduce clutter, we could
// (1) here, search gradients by color and return what is found without duplication
// (2) in fill & stroke, show only one copy of each gradient in list
Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
gchar b[64];
sp_svg_write_color(b, 64, color);
{
gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
stop->setAttribute("style", t);
g_free(t);
}
stop->setAttribute("offset", "0");
repr->appendChild(stop);
Inkscape::GC::release(stop);
stop = xml_doc->createElement("svg:stop");
{
gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
stop->setAttribute("style", t);
g_free(t);
}
stop->setAttribute("offset", "1");
repr->appendChild(stop);
Inkscape::GC::release(stop);
SP_OBJECT_REPR(defs)->addChild(repr, NULL);
Inkscape::GC::release(repr);
/* fixme: This does not look like nice */
SPGradient *gr;
gr = (SPGradient *) document->getObjectByRepr(repr);
g_assert(gr != NULL);
g_assert(SP_IS_GRADIENT(gr));
/* fixme: Maybe add extra sanity check here */
gr->state = SP_GRADIENT_STATE_VECTOR;
return gr;
}
/**
Return the preferred vector for \a o, made from (in order of preference) its current vector,
current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
*/
SPGradient *
sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
SPObject *const o, bool const is_fill)
{
guint32 rgba = 0;
if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
rgba = sp_desktop_get_color(desktop, is_fill);
} else {
// take the color of the object
SPStyle const &style = *SP_OBJECT_STYLE(o);
SPIPaint const &paint = ( is_fill
? style.fill
: style.stroke );
if (paint.type == SP_PAINT_TYPE_COLOR) {
rgba = sp_color_get_rgba32_ualpha(&paint.value.color, 0xff);
} else if (paint.type == SP_PAINT_TYPE_PAINTSERVER) {
SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
if (SP_IS_GRADIENT (server)) {
return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
} else {
rgba = sp_desktop_get_color(desktop, is_fill);
}
} else {
// if o doesn't use flat color, then take current color of the desktop.
rgba = sp_desktop_get_color(desktop, is_fill);
}
}
return sp_document_default_gradient_vector(doc, rgba);
}
SPGradient *
sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
{
SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
vector = sp_gradient_fork_vector_if_necessary (vector);
if ( gradient != vector && gradient->ref->getObject() != vector ) {
sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
}
return vector;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :