New background-position YAML prop, plus position arg on image delim.

app/com/gitpitch/models/MarkdownModel.java

@@ -179,11 +179,17 @@ public class MarkdownModel implements Markdown {
                     yOpts.fetchImageBgSize(pp) : YAMLOptions.DEFAULT_BG_SIZE;
                 String defaultBgColor = (yOpts != null) ?
                     yOpts.fetchImageBgColor(pp) : YAMLOptions.DEFAULT_BG_COLOR;
+                String defaultBgPosition = (yOpts != null) ?
+                    yOpts.fetchImageBgPosition(pp) : YAMLOptions.DEFAULT_BG_POSITION;
 
                 return new StringBuffer(delimiter(md))
                         .append(imageService.buildBackground(md,
-                                dp, pp, defaultBgSize, defaultBgColor, this))
+                                                             dp,
-                        .toString();
+                                                             pp,
+                                                             defaultBgSize,
+                                                             defaultBgColor,
+                                                             defaultBgPosition,
+                                                             this)).toString();
 
             } else if (gistDelimFound(dp)) {
                 return gistService.build(md, dp, pp, yOpts, this);
@@ -647,6 +653,7 @@ public class MarkdownModel implements Markdown {
     public static final String DELIM_QUERY_LANG  = "lang";
     public static final String DELIM_QUERY_SIZE  = "size";
     public static final String DELIM_QUERY_COLOR = "color";
+    public static final String DELIM_QUERY_POSITION = "position";
     public static final String DELIM_QUERY_FILE  = "file";
     public static final String DELIM_QUERY_TITLE = "title";
 
@@ -662,6 +669,8 @@ public class MarkdownModel implements Markdown {
             "\" data-background-size=\"";
     public static final String MD_IMAGE_COLOR =
             "\" data-background-color=\"";
+    public static final String MD_IMAGE_POSITION =
+            "\" data-background-position=\"";
     public static final String MD_BG_COLOR =
             "<!-- .slide: data-background=\"";
     public static final String MD_CLOSER = "\" -->";

app/com/gitpitch/services/ImageService.java

@@ -46,7 +46,8 @@ public class ImageService {
 
         return buildBackground(yOpts.fetchImageBg(pp),
                                yOpts.fetchImageBgSize(pp),
-                               yOpts.fetchImageBgColor(pp));
+                               yOpts.fetchImageBgColor(pp),
+                               yOpts.fetchImageBgPosition(pp));
     }
 
     public String buildBackground(String md,
@@ -54,18 +55,21 @@ public class ImageService {
                                   PitchParams pp,
                                   String defaultSize,
                                   String defaultColor,
+                                  String defaultPos,
                                   MarkdownModel mdm) {
 
         String bgUrl = dp.get(MarkdownModel.DELIM_QUERY_IMAGE);
         bgUrl = mdm.linkLive(pp, bgUrl);
         String bgSize = dp.get(MarkdownModel.DELIM_QUERY_SIZE, defaultSize);
         String bgColor = dp.get(MarkdownModel.DELIM_QUERY_COLOR, defaultColor);
-        return buildBackground(bgUrl, bgSize, bgColor);
+        String bgPos = dp.get(MarkdownModel.DELIM_QUERY_POSITION, defaultPos);
+        return buildBackground(bgUrl, bgSize, bgColor, bgPos);
     }
 
     private String buildBackground(String bgUrl,
                                    String bgSize,
-                                   String bgColor) {
+                                   String bgColor,
+                                   String bgPosition) {
 
         return new StringBuffer(MarkdownModel.MD_SPACER)
                 .append(MarkdownModel.MD_IMAGE_OPEN)
@@ -74,6 +78,8 @@ public class ImageService {
                 .append(bgSize)
                 .append(MarkdownModel.MD_IMAGE_COLOR)
                 .append(bgColor)
+                .append(MarkdownModel.MD_IMAGE_POSITION)
+                .append(bgPosition)
                 .append(MarkdownModel.MD_CLOSER)
                 .append(MarkdownModel.MD_SPACER)
                 .toString();

app/com/gitpitch/utils/YAMLOptions.java

@@ -213,6 +213,15 @@ public final class YAMLOptions {
         }
     }
 
+    public String fetchImageBgPosition(PitchParams pp) {
+        String bgPosition = _yProps.get(IMAGE_BG_POSITION_OPTION);
+        if (bgPosition == null) {
+            return DEFAULT_BG_POSITION;
+        } else {
+            return bgPosition;
+        }
+    }
+
     public String fetchTransition(PitchParams pp) {
 
         String transition = _yProps.get(TRANSITION_OPTION);
@@ -390,6 +399,7 @@ public final class YAMLOptions {
     public static final String PITCHME_YAML = "PITCHME.yaml";
     public static final String DEFAULT_BG_SIZE = "100% 100%";
     public static final String DEFAULT_BG_COLOR = " ";
+    public static final String DEFAULT_BG_POSITION = "center";
     public static final String DEFAULT_TRANSITION = "slide";
     public static final String MATHJAX_DEFAULT = "TeX-MML-AM_CHTML";
     public static final String HIGHLIGHT_DARK_DEFAULT = "github-gist.css";
@@ -405,6 +415,7 @@ public final class YAMLOptions {
     private static final String IMAGE_BG_OPTION = "background";
     private static final String IMAGE_BG_SIZE_OPTION = "background-size";
     private static final String IMAGE_BG_COLOR_OPTION = "background-color";
+    private static final String IMAGE_BG_POSITION_OPTION = "background-position";
     private static final String TRANSITION_OPTION = "transition";
     private static final String AUTOSLIDE_OPTION = "autoslide";
     private static final String LOOP_OPTION = "loop";