added from black perspective to image generation (#109)

* added from black perspective to image generation * flipped black files Co-authored-by: Logan Spears <logan@logan-desktop.lan>
notnil · Aug 14, 2022 · 7c0de58 · 7c0de58
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diff --git a/image/README.md b/image/README.md
@@ -40,6 +40,18 @@ mark := image.MarkSquares(yellow, chess.D2, chess.D4)
 image.SVG(file, pos.Board(), mark)
 ```
 
+### Perspective
+
+Perspective is designed to be used as an optional argument
+to the SVG function.  It draws the board from the perspective
+of the given color.  White is the default.  The following 
+generates a board from Black's perspective:
+
+```go
+fromBlack := image.Perspective(chess.Black)
+image.SVG(file, pos.Board(), fromBlack)
+```
+
 ### Example Program
 
 ```go