Add image showing patches with different numbers of control points

doc/manual.adoc

@@ -740,10 +740,13 @@ the patch in the current 2D view (the third dimension is not important, since
 the patch will be infinitely thin once created).
 . With the brush selected, choose *Create Simple Patch Mesh* from the *Patch*
 menu.
-. In the dialog which appears, choose the number of control points which should
-control the shape of the patch along its width and height. A patch can have
-between 3 and 15 control points in each dimension; there will always be a
-control point at the extreme edge, and one in the middle. More control points
-allow more complex shapes but also require more manual adjustment -- creating a
-simple arch is much easier with just three control points.
+. In the dialog, choose the number of control points to define the shape of the
+patch along its width and height. A patch can have between 3 and 15 control
+points in each dimension; there will always be a control point at the extreme
+edge, and one in the middle. More control points allow more complex shapes but
+also require more manual adjustment -- creating a simple arch is much easier
+with just three control points.
 . Click *OK* to create the patch.
+
+.Simple patches with 3, 7 and 15 control points in both dimensions
+image::SimplePatchesControlPoints.png[align="center"]

doc/manual.html

@@ -1642,26 +1642,32 @@ <h4 id="_creating_a_simple_patch">Creating a simple patch</h4>
 menu.</p>
 </li>
 <li>
-<p>In the dialog which appears, choose the number of control points which should
-control the shape of the patch along its width and height. A patch can have
-between 3 and 15 control points in each dimension; there will always be a
-control point at the extreme edge, and one in the middle. More control points
-allow more complex shapes but also require more manual adjustment&#8201;&#8212;&#8201;creating a
-simple arch is much easier with just three control points.</p>
+<p>In the dialog, choose the number of control points to define the shape of the
+patch along its width and height. A patch can have between 3 and 15 control
+points in each dimension; there will always be a control point at the extreme
+edge, and one in the middle. More control points allow more complex shapes but
+also require more manual adjustment&#8201;&#8212;&#8201;creating a simple arch is much easier
+with just three control points.</p>
 </li>
 <li>
 <p>Click <strong>OK</strong> to create the patch.</p>
 </li>
 </ol>
 </div>
+<div class="imageblock" style="text-align: center">
+<div class="content">
+<img src="img/SimplePatchesControlPoints.png" alt="SimplePatchesControlPoints">
+</div>
+<div class="title">Figure 5. Simple patches with 3, 7 and 15 control points in both dimensions</div>
+</div>
 </div>
 </div>
 </div>
 </div>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2018-08-28 21:24:10 BST
+Last updated 2018-08-29 20:52:44 BST
 </div>
 </div>
 </body>