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 "svg/svg.h"
18 #include "prefs-utils.h"
19 #include <algorithm>
21 Inkscape::SVG::PathString::PathString() :
22 allow_relative_coordinates(0 != prefs_get_int_attribute("options.svgoutput", "allowrelativecoordinates", 1)),
23 force_repeat_commands(0 != prefs_get_int_attribute("options.svgoutput", "forcerepeatcommands", 0))
24 {}
26 void Inkscape::SVG::PathString::_appendOp(char abs_op, char rel_op) {
27 bool abs_op_repeated = _abs_state.prevop == abs_op && !force_repeat_commands;
28 bool rel_op_repeated = _rel_state.prevop == rel_op && !force_repeat_commands;
29 unsigned int const abs_added_size = abs_op_repeated ? 0 : 2;
30 unsigned int const rel_added_size = rel_op_repeated ? 0 : 2;
31 if ( false && _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size && allow_relative_coordinates ) {
32 // Copy rel to abs
33 _abs_state = _rel_state;
34 _abs_state.switches++;
35 abs_op_repeated = false;
36 // We do not have to copy abs to rel:
37 // _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size
38 // _rel_state.str.size()+rel_added_size < _abs_state.str.size()+2
39 // _abs_state.str.size()+2 > _rel_state.str.size()+rel_added_size
40 } else if ( false && _abs_state.str.size()+2 < _rel_state.str.size()+rel_added_size ) {
41 // Copy abs to rel
42 _rel_state = _abs_state;
43 _abs_state.switches++;
44 rel_op_repeated = false;
45 }
46 if ( !abs_op_repeated ) _abs_state.appendOp(abs_op);
47 if ( !rel_op_repeated ) _rel_state.appendOp(rel_op);
48 }
50 void Inkscape::SVG::PathString::State::append(NR::Coord v) {
51 SVGOStringStream os;
52 os << ' ' << v;
53 str.append(os.str());
54 }
56 void Inkscape::SVG::PathString::State::append(NR::Point p) {
57 SVGOStringStream os;
58 os << ' ' << p[NR::X] << ',' << p[NR::Y];
59 str.append(os.str());
60 }
62 void Inkscape::SVG::PathString::State::append(NR::Coord v, NR::Coord &rv) {
63 SVGOStringStream os;
64 os << v;
65 str += ' ';
66 str += os.str();
67 double c;
68 sp_svg_number_read_d(os.str().c_str(), &c);
69 rv = c;
70 }
72 void Inkscape::SVG::PathString::State::append(NR::Point p, NR::Point &rp) {
73 SVGOStringStream osx, osy;
74 osx << p[NR::X];
75 osy << p[NR::Y];
76 str += ' ';
77 str += osx.str();
78 str += ',';
79 str += osy.str();
80 double x, y;
81 sp_svg_number_read_d(osx.str().c_str(), &x);
82 sp_svg_number_read_d(osy.str().c_str(), &y);
83 rp[NR::X] = x;
84 rp[NR::Y] = y;
85 }
87 // NOTE: The following two appendRelative methods will not be exact if the total number of digits needed
88 // to represent the difference exceeds the precision of a double. This is not very likely though, and if
89 // it does happen the imprecise value is not likely to be chosen (because it will probably be a lot longer
90 // than the absolute value).
92 void Inkscape::SVG::PathString::State::appendRelative(NR::Coord v, NR::Coord r) {
93 SVGOStringStream os;
94 int precision = (int)os.precision();
95 int digitsBegin = (int)floor(log10(fabs(v-r))); // Position of first digit of difference
96 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
97 os << ' ';
98 if (r == 0) {
99 os.precision(precision);
100 os << v;
101 } else if (v == 0) {
102 os.precision(precision);
103 os << -r;
104 } else if (digitsBegin>digitsEnd) {
105 os.precision(digitsBegin-digitsEnd);
106 os << (v-r);
107 } else {
108 // This assumes the input numbers are already rounded to 'precision' digits
109 os << '0';
110 }
111 str.append(os.str());
112 }
114 void Inkscape::SVG::PathString::State::appendRelative(NR::Point p, NR::Point r) {
115 SVGOStringStream os;
116 int precision = (int)os.precision();
117 int digitsBeginX = (int)floor(log10(fabs(p[NR::X]-r[NR::X]))); // Position of first digit of difference
118 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
119 int digitsBeginY = (int)floor(log10(fabs(p[NR::Y]-r[NR::Y]))); // Position of first digit of difference
120 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
121 os << ' ';
122 if (r[NR::X] == 0) {
123 os.precision(precision);
124 os << p[NR::X];
125 } else if (p[NR::X] == 0) {
126 os.precision(precision);
127 os << -r[NR::X];
128 } else if (digitsBeginX>digitsEndX) {
129 os.precision(digitsBeginX-digitsEndX);
130 os << (p[NR::X]-r[NR::X]);
131 } else {
132 // This assumes the input numbers are already rounded to 'precision' digits
133 os << '0';
134 }
135 os << ',';
136 if (r[NR::Y] == 0) {
137 os.precision(precision);
138 os << p[NR::Y];
139 } else if (p[NR::Y] == 0) {
140 os.precision(precision);
141 os << -r[NR::Y];
142 } else if (digitsBeginY>digitsEndY) {
143 os.precision(digitsBeginY-digitsEndY);
144 os << (p[NR::Y]-r[NR::Y]);
145 } else {
146 // This assumes the input numbers are already rounded to 'precision' digits
147 os << '0';
148 }
149 str.append(os.str());
150 }
152 /*
153 Local Variables:
154 mode:c++
155 c-file-style:"stroustrup"
156 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
157 indent-tabs-mode:nil
158 fill-column:99
159 End:
160 */
161 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :