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/*
* Copyright © 2004 Keith Packard
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Keith Packard
*
* Contributor(s):
* Keith Packard <keithp@keithp.com>
*/
autoimport Cairo;
real π = pi;
real text_width (cairo_t cr, string text) = text_extents (cr, text).width;
real text_height(cairo_t cr, string text) = text_extents (cr, text).height;
void circle_text (cairo_t cr, string text)
{
real circumference = 0;
for (int i = 0; i < String::length(text); i++)
circumference += text_width (cr, String::substr(text,i,1));
real radius = circumference / (2 * π);
real height = text_height (cr, text) * 2;
translate (cr, radius + height, radius + height);
real θ = -π ÷ 2;
for (int i = 0; i < String::length(text); i++)
{
string c = String::substr (text, i, 1);
real width = text_width (cr, c);
save (cr);
rotate (cr, θ + π ÷ 2);
translate (cr, -width ÷ 2, -radius);
move_to (cr, 0, 0);
show_text (cr, c);
restore (cr);
θ += asin ((width ÷ 2) / radius) * 2;
}
}
void spiral_text (cairo_t cr, string text)
{
real circumference = 0;
translate (cr, width(cr) / 2, height(cr) / 2);
real height = text_height (cr, text) * 3;
real θ = -π ÷ 2;
for (int i = 0; i < String::length(text); i++)
{
string c = String::substr (text, i, 1);
real width = text_width (cr, c);
real radius = ((θ + π) * height / (2 × π));
save (cr);
rotate (cr, θ + π ÷ 2);
set_source_hsv (cr, θ / (2 * pi), 1, 0.7);
translate (cr, -width ÷ 2, -radius);
move_to (cr, 0, 0);
show_text (cr, c);
restore (cr);
θ += asin ((width ÷ 2) / radius) * 2;
}
}
void pie (int bits)
{
cairo_t cr = new (700, 700);
sleep (100);
set_font (cr, "sans\\-serif-10");
spiral_text (cr, sprintf ("%.-g", pi_value (bits)));
}
if (dim(argv) > 0) {
pie (8192);
while (true) sleep (1000);
}
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