Fixed a couple minor things in design docs

docs/design/designdoc.rst

@@ -77,7 +77,7 @@ directions).
 .. image:: screenshot.png
     :alt: A screenshot of Overviewer output
 
-The Overviewer is a sprite-based renderer. Each block corresponds to a
+The Overviewer is a sprite-based renderer. Each block type corresponds to a
 pre-rendered sprite (a small image). The basic idea is to iterate over the
 blocks of the world and draw these sprites to the appropriate location on the
 map.
@@ -86,8 +86,8 @@ These are the high-level tasks The Overviewer must preform in rendering a map:
 
 1. Render each block sprite from the textures
 2. Scan the chunks of the world and determine which tiles need rendering
-3. Render a single chunk from the blocks sprites
+3. Render a chunk by drawing the appropriate blocks sprites on an image
-4. Render a single tile of the map from chunk images
+4. Render a tile of the map from several chunk images
 5. Compose the lower-zoom tiles from the higher-zoom tiles
 
 The next sections will go over how these tasks work.

docs/design/tilerendering/chunkpositioning.svg

@@ -14,7 +14,10 @@
    id="svg4984"
    version="1.1"
    inkscape:version="0.48.1 r9760"
-   sodipodi:docname="chunkpositioning.svg">
+   sodipodi:docname="chunkpositioning.svg"
+   inkscape:export-filename="/home/andrew/mc/overviewer/anvil/docs/design/tilerendering/chunkpositioning.png"
+   inkscape:export-xdpi="26.505878"
+   inkscape:export-ydpi="26.505878">
   <defs
      id="defs4986">
     <marker
@@ -80,7 +83,7 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title />
+        <dc:title></dc:title>
       </cc:Work>
     </rdf:RDF>
   </metadata>