1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <cairo.h>
#include "sp-linear-gradient.h"
#include "attributes.h"
#include "style.h"
#include "xml/repr.h"
/*
* Linear Gradient
*/
SPLinearGradient::SPLinearGradient() : SPGradient() {
this->x1.unset(SVGLength::PERCENT, 0.0, 0.0);
this->y1.unset(SVGLength::PERCENT, 0.0, 0.0);
this->x2.unset(SVGLength::PERCENT, 1.0, 1.0);
this->y2.unset(SVGLength::PERCENT, 0.0, 0.0);
}
SPLinearGradient::~SPLinearGradient() = default;
void SPLinearGradient::build(SPDocument *document, Inkscape::XML::Node *repr) {
this->readAttr(SPAttr::X1);
this->readAttr(SPAttr::Y1);
this->readAttr(SPAttr::X2);
this->readAttr(SPAttr::Y2);
SPGradient::build(document, repr);
}
/**
* Callback: set attribute.
*/
void SPLinearGradient::set(SPAttr key, const gchar* value) {
switch (key) {
case SPAttr::X1:
this->x1.readOrUnset(value, SVGLength::PERCENT, 0.0, 0.0);
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SPAttr::Y1:
this->y1.readOrUnset(value, SVGLength::PERCENT, 0.0, 0.0);
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SPAttr::X2:
this->x2.readOrUnset(value, SVGLength::PERCENT, 1.0, 1.0);
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
case SPAttr::Y2:
this->y2.readOrUnset(value, SVGLength::PERCENT, 0.0, 0.0);
this->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
default:
SPGradient::set(key, value);
break;
}
}
void
SPLinearGradient::update(SPCtx *ctx, guint flags)
{
// To do: Verify flags.
if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
SPItemCtx const *ictx = reinterpret_cast<SPItemCtx const *>(ctx);
if (getUnits() == SP_GRADIENT_UNITS_USERSPACEONUSE) {
double w = ictx->viewport.width();
double h = ictx->viewport.height();
double const em = style->font_size.computed;
double const ex = 0.5 * em; // fixme: get x height from pango or libnrtype.
this->x1.update(em, ex, w);
this->y1.update(em, ex, h);
this->x2.update(em, ex, w);
this->y2.update(em, ex, h);
}
}
}
/**
* Callback: write attributes to associated repr.
*/
Inkscape::XML::Node* SPLinearGradient::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
repr = xml_doc->createElement("svg:linearGradient");
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->x1._set) {
repr->setAttributeSvgDouble("x1", this->x1.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->y1._set) {
repr->setAttributeSvgDouble("y1", this->y1.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->x2._set) {
repr->setAttributeSvgDouble("x2", this->x2.computed);
}
if ((flags & SP_OBJECT_WRITE_ALL) || this->y2._set) {
repr->setAttributeSvgDouble("y2", this->y2.computed);
}
SPGradient::write(xml_doc, repr, flags);
return repr;
}
cairo_pattern_t* SPLinearGradient::pattern_new(cairo_t * /*ct*/, Geom::OptRect const &bbox, double opacity) {
this->ensureVector();
cairo_pattern_t *cp = cairo_pattern_create_linear(
this->x1.computed, this->y1.computed,
this->x2.computed, this->y2.computed);
sp_gradient_pattern_common_setup(cp, this, bbox, opacity);
return cp;
}
/*
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 :
|
