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/*
Copyright (c) 2011 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 = "";
var lines = layout.get_lines().copy();
foreach (var line in lines) {
string next_line = text.substring(line.start_index, line.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;
layout.set_text(broken_string_tmp, -1);
Pango.Rectangle extents;
layout.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);
}
}
}
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