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/////////////////////////////////////////////////////////////////////////
// Copyright 2011-2021 Simon Schneegans
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
/////////////////////////////////////////////////////////////////////////
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);
}
}
}
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