From 279f17ac0e1b3d019c2b294098e834d249376686 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson@vistahigherlearning.com>
Date: Tue, 4 Jun 2019 20:49:16 -0400
Subject: Update chickadee manual.

---
 manuals/chickadee/Easings.html | 47 ++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 18 deletions(-)

(limited to 'manuals/chickadee/Easings.html')
diff --git a/manuals/chickadee/Easings.html b/manuals/chickadee/Easings.html
index 55f385c..14207d0 100644
--- a/manuals/chickadee/Easings.html
+++ b/manuals/chickadee/Easings.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
-<!-- Copyright (C) 2017  David Thompson davet@gnu.org
+<!-- Copyright (C) 2017, 2018, 2019  David Thompson davet@gnu.org
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3
@@ -13,6 +13,8 @@ A copy of the license is also available from the Free Software
 Foundation Web site at http://www.gnu.org/licenses/fdl.html.
 
 
+* Chickadee: (chickadee).     Game programming toolkit for Guile.
+
 The document was typeset with
 http://www.texinfo.org/ (GNU Texinfo).
  -->
@@ -96,72 +98,81 @@ Next: <a href="Bezier-Curves.html#Bezier-Curves" accesskey="n" rel="next">Bezier
 <a name="Easings-1"></a>
 <h4 class="subsection">2.2.7 Easings</h4>
 
+<p>Easing functions are essential for animation.  Each easing function
+provides a different path to go from an initial value to a final
+value.  These functions make an excellent companion to the
+<code>tween</code> procedure (see <a href="Tweening.html#Tweening">Tweening</a>).  Experiment with them to
+figure out which function makes an animation look the best.
+</p>
+<p>Pro tip: <code>smoothstep</code> provides nice results most of the time and
+creates smoother animation than using <code>linear</code>.
+</p>
 <dl>
-<dt><a name="index-linear"></a>Procedure: <strong>linear</strong> <em><var>t</var></em></dt>
+<dt><a name="index-linear"></a>Procedure: <strong>linear</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-smoothstep"></a>Procedure: <strong>smoothstep</strong> <em><var>t</var></em></dt>
+<dt><a name="index-smoothstep"></a>Procedure: <strong>smoothstep</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dquad"></a>Procedure: <strong>ease-in-quad</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dquad"></a>Procedure: <strong>ease-in-quad</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002dout_002dquad"></a>Procedure: <strong>ease-out-quad</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002dout_002dquad"></a>Procedure: <strong>ease-out-quad</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dout_002dquad"></a>Procedure: <strong>ease-in-out-quad</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dout_002dquad"></a>Procedure: <strong>ease-in-out-quad</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dcubic"></a>Procedure: <strong>ease-in-cubic</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dcubic"></a>Procedure: <strong>ease-in-cubic</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002dout_002dcubic"></a>Procedure: <strong>ease-out-cubic</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002dout_002dcubic"></a>Procedure: <strong>ease-out-cubic</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dout_002dcubic"></a>Procedure: <strong>ease-in-out-cubic</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dout_002dcubic"></a>Procedure: <strong>ease-in-out-cubic</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dquart"></a>Procedure: <strong>ease-in-quart</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dquart"></a>Procedure: <strong>ease-in-quart</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002dout_002dquart"></a>Procedure: <strong>ease-out-quart</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002dout_002dquart"></a>Procedure: <strong>ease-out-quart</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dout_002dquart"></a>Procedure: <strong>ease-in-out-quart</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dout_002dquart"></a>Procedure: <strong>ease-in-out-quart</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dquint"></a>Procedure: <strong>ease-in-quint</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dquint"></a>Procedure: <strong>ease-in-quint</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002dout_002dquint"></a>Procedure: <strong>ease-out-quint</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002dout_002dquint"></a>Procedure: <strong>ease-out-quint</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dout_002dquint"></a>Procedure: <strong>ease-in-out-quint</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dout_002dquint"></a>Procedure: <strong>ease-in-out-quint</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dsine"></a>Procedure: <strong>ease-in-sine</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dsine"></a>Procedure: <strong>ease-in-sine</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002dout_002dsine"></a>Procedure: <strong>ease-out-sine</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002dout_002dsine"></a>Procedure: <strong>ease-out-sine</strong> <em>t</em></dt>
 </dl>
 
 <dl>
-<dt><a name="index-ease_002din_002dout_002dsine"></a>Procedure: <strong>ease-in-out-sine</strong> <em><var>t</var></em></dt>
+<dt><a name="index-ease_002din_002dout_002dsine"></a>Procedure: <strong>ease-in-out-sine</strong> <em>t</em></dt>
 </dl>
 
 
-- 
cgit v1.2.3

