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
143
144
145
146
147
148
149
150
151
152
|
/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2015 by Simon Schneegans
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
/////////////////////////////////////////////////////////////////////////
namespace GnomePie {
/////////////////////////////////////////////////////////////////////////
/// A class representing string, rendered on an Image.
/////////////////////////////////////////////////////////////////////////
public class RenderedText : Image {
/////////////////////////////////////////////////////////////////////
/// C'tor, creates a new image representation of a string.
/////////////////////////////////////////////////////////////////////
public RenderedText(string text, int width, int height, string font,
Color color, double scale) {
this.render_text(text, width, height, font, color, scale);
}
/////////////////////////////////////////////////////////////////////
/// C'tor, creates a new image representation of a string. This
/// string may contain markup information.
/////////////////////////////////////////////////////////////////////
public RenderedText.with_markup(string text, int width, int height, string font,
Color color, double scale) {
this.render_markup(text, width, height, font, color, scale);
}
/////////////////////////////////////////////////////////////////////
/// Creates a new transparent image, with text written onto.
/////////////////////////////////////////////////////////////////////
public void render_text(string text, int width, int height, string font,
Color color, double scale) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
if (text != "") {
var ctx = this.context();
// set the color
ctx.set_source_rgb(color.r, color.g, color.g);
var layout = Pango.cairo_create_layout(ctx);
layout.set_width(Pango.units_from_double(width));
var font_description = Pango.FontDescription.from_string(font);
font_description.set_size((int)(font_description.get_size() * scale));
layout.set_font_description(font_description);
layout.set_text(text, -1);
// add newlines at the end of each line, in order to allow ellipsizing
string broken_string = "";
for (int i=0; i<layout.get_line_count(); ++i) {
string next_line = "";
if (i == layout.get_line_count() -1)
next_line = text.substring(layout.get_line(i).start_index, -1);
else
next_line = text.substring(layout.get_line(i).start_index, layout.get_line(i).length);
if (broken_string == "") {
broken_string = next_line;
} else if (next_line != "") {
// test whether the addition of a line would cause the height to become too large
string broken_string_tmp = broken_string + "\n" + next_line;
var layout_tmp = Pango.cairo_create_layout(ctx);
layout_tmp.set_width(Pango.units_from_double(width));
layout_tmp.set_font_description(font_description);
layout_tmp.set_text(broken_string_tmp, -1);
Pango.Rectangle extents;
layout_tmp.get_pixel_extents(null, out extents);
if (extents.height > height) broken_string = broken_string + next_line;
else broken_string = broken_string_tmp;
}
}
layout.set_text(broken_string, -1);
layout.set_ellipsize(Pango.EllipsizeMode.END);
layout.set_alignment(Pango.Alignment.CENTER);
Pango.Rectangle extents;
layout.get_pixel_extents(null, out extents);
ctx.move_to(0, (int)(0.5*(height - extents.height)));
Pango.cairo_update_layout(ctx, layout);
Pango.cairo_show_layout(ctx, layout);
}
}
/////////////////////////////////////////////////////////////////////
/// Creates a new transparent image, with text written onto.
/////////////////////////////////////////////////////////////////////
public void render_markup(string text, int width, int height, string font,
Color color, double scale) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
var ctx = this.context();
// set the color
ctx.set_source_rgb(color.r, color.g, color.g);
var layout = Pango.cairo_create_layout(ctx);
layout.set_width(Pango.units_from_double(width));
var font_description = Pango.FontDescription.from_string(font);
font_description.set_size((int)(font_description.get_size() * scale));
layout.set_font_description(font_description);
layout.set_markup(text, -1);
layout.set_ellipsize(Pango.EllipsizeMode.END);
layout.set_alignment(Pango.Alignment.CENTER);
Pango.Rectangle extents;
layout.get_pixel_extents(null, out extents);
ctx.move_to(0, (int)(0.5*(height - extents.height)));
Pango.cairo_update_layout(ctx, layout);
Pango.cairo_show_layout(ctx, layout);
}
}
}
|
