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Diffstat (limited to 'src/images/renderedText.vala')
| -rw-r--r-- | src/images/renderedText.vala | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/images/renderedText.vala b/src/images/renderedText.vala new file mode 100644 index 0000000..2f4b82f --- /dev/null +++ b/src/images/renderedText.vala @@ -0,0 +1,152 @@ +///////////////////////////////////////////////////////////////////////// +// 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); + } +} + +} |