44b474dd246162541d722850834c447d5db0789d
1 /*
2 * Inkscape::SVG::PathString - builder for SVG path strings
3 *
4 * Copyright 2008 Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * See the file COPYING for details.
12 *
13 */
15 #include "svg/path-string.h"
16 #include "svg/stringstream.h"
17 #include "prefs-utils.h"
18 #include <algorithm>
20 Inkscape::SVG::PathString::PathString() :
21 allow_relative_coordinates(0 != prefs_get_int_attribute("options.svgoutput", "allowrelativecoordinates", 1)),
22 force_repeat_commands(0 != prefs_get_int_attribute("options.svgoutput", "forcerepeatcommands", 0))
23 {}
25 void Inkscape::SVG::PathString::_appendOp(char abs_op, char rel_op) {
26 bool abs_op_repeated = _abs_state.prevop == abs_op && !force_repeat_commands;
27 bool rel_op_repeated = _rel_state.prevop == rel_op && !force_repeat_commands;
28 unsigned int const abs_added_size = abs_op_repeated ? 0 : 2;
29 unsigned int const rel_added_size = rel_op_repeated ? 0 : 2;
30 if ( false && _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size && allow_relative_coordinates ) {
31 // Copy rel to abs
32 _abs_state = _rel_state;
33 _abs_state.switches++;
34 abs_op_repeated = false;
35 // We do not have to copy abs to rel:
36 // _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size
37 // _rel_state.str.size()+rel_added_size < _abs_state.str.size()+2
38 // _abs_state.str.size()+2 > _rel_state.str.size()+rel_added_size
39 } else if ( false && _abs_state.str.size()+2 < _rel_state.str.size()+rel_added_size ) {
40 // Copy abs to rel
41 _rel_state = _abs_state;
42 _abs_state.switches++;
43 rel_op_repeated = false;
44 }
45 if ( !abs_op_repeated ) _abs_state.appendOp(abs_op);
46 if ( !rel_op_repeated ) _rel_state.appendOp(rel_op);
47 }
49 void Inkscape::SVG::PathString::State::append(NR::Coord v) {
50 SVGOStringStream os;
51 os << ' ' << v;
52 str.append(os.str());
53 }
55 void Inkscape::SVG::PathString::State::append(NR::Point p) {
56 SVGOStringStream os;
57 os << ' ' << p[NR::X] << ',' << p[NR::Y];
58 str.append(os.str());
59 }
61 void Inkscape::SVG::PathString::State::append(NR::Coord v, NR::Coord &rv) {
62 SVGOStringStream os;
63 os << ' ' << v;
64 str.append(os.str());
65 double c;
66 sscanf(os.str().c_str(), " %lf", &c);
67 rv = c;
68 }
70 void Inkscape::SVG::PathString::State::append(NR::Point p, NR::Point &rp) {
71 SVGOStringStream os;
72 os << ' ' << p[NR::X] << ',' << p[NR::Y];
73 str.append(os.str());
74 double x, y;
75 sscanf(os.str().c_str(), " %lf,%lf", &x, &y);
76 rp[NR::X] = x;
77 rp[NR::Y] = y;
78 }
80 // NOTE: The following two appendRelative methods will not be exact if the total number of digits needed
81 // to represent the difference exceeds the precision of a double. This is not very likely though, and if
82 // it does happen the imprecise value is not likely to be chosen (because it will probably be a lot longer
83 // than the absolute value).
85 void Inkscape::SVG::PathString::State::appendRelative(NR::Coord v, NR::Coord r) {
86 SVGOStringStream os;
87 int precision = (int)os.precision();
88 int digitsBegin = (int)floor(log10(fabs(v-r))); // Position of first digit of difference
89 int digitsEnd = (int)floor(log10(std::min(fabs(v),fabs(r)))) - precision; // Position just beyond the last significant digit of the smallest (in absolute sense) number
90 os << ' ';
91 if (r == 0) {
92 os.precision(precision);
93 os << v;
94 } else if (v == 0) {
95 os.precision(precision);
96 os << -r;
97 } else if (digitsBegin>digitsEnd) {
98 os.precision(digitsBegin-digitsEnd);
99 os << (v-r);
100 } else {
101 // This assumes the input numbers are already rounded to 'precision' digits
102 os << '0';
103 }
104 str.append(os.str());
105 }
107 void Inkscape::SVG::PathString::State::appendRelative(NR::Point p, NR::Point r) {
108 SVGOStringStream os;
109 int precision = (int)os.precision();
110 int digitsBeginX = (int)floor(log10(fabs(p[NR::X]-r[NR::X]))); // Position of first digit of difference
111 int digitsEndX = (int)floor(log10(std::min(fabs(p[NR::X]),fabs(r[NR::X])))) - precision; // Position just beyond the last significant digit of the smallest (in absolute sense) number
112 int digitsBeginY = (int)floor(log10(fabs(p[NR::Y]-r[NR::Y]))); // Position of first digit of difference
113 int digitsEndY = (int)floor(log10(std::min(fabs(p[NR::Y]),fabs(r[NR::Y])))) - precision; // Position just beyond the last significant digit of the smallest (in absolute sense) number
114 os << ' ';
115 if (r[NR::X] == 0) {
116 os.precision(precision);
117 os << p[NR::X];
118 } else if (p[NR::X] == 0) {
119 os.precision(precision);
120 os << -r[NR::X];
121 } else if (digitsBeginX>digitsEndX) {
122 os.precision(digitsBeginX-digitsEndX);
123 os << (p[NR::X]-r[NR::X]);
124 } else {
125 // This assumes the input numbers are already rounded to 'precision' digits
126 os << '0';
127 }
128 os << ',';
129 if (r[NR::Y] == 0) {
130 os.precision(precision);
131 os << p[NR::Y];
132 } else if (p[NR::Y] == 0) {
133 os.precision(precision);
134 os << -r[NR::Y];
135 } else if (digitsBeginY>digitsEndY) {
136 os.precision(digitsBeginY-digitsEndY);
137 os << (p[NR::Y]-r[NR::Y]);
138 } else {
139 // This assumes the input numbers are already rounded to 'precision' digits
140 os << '0';
141 }
142 str.append(os.str());
143 }
145 /*
146 Local Variables:
147 mode:c++
148 c-file-style:"stroustrup"
149 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
150 indent-tabs-mode:nil
151 fill-column:99
152 End:
153 */
154 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :