Simple-Circle-Button.md

@@ -54,6 +54,9 @@ for (int i = 0; i < bmb.getPiecePlaceEnum().pieceNumber(); i++) {
             // Set the radius of shadow of the boom-button.
             .shadowRadius(Util.dp2px(20))
 
+            // Set the corner-radius of the shadow.
+            .shadowCornerRadius(Util.dp2px(20))
+
             // Set the color of the shadow of boom-button.
             .shadowColor(Color.parseColor("#ee000000"))
 
@@ -118,12 +121,32 @@ for (int i = 0; i < bmb.getPiecePlaceEnum().pieceNumber(); i++) {
             .unable(false)
 
             // The radius of boom-button, in pixel.
-            .buttonRadius(Util.dp2px(40));
+            .buttonRadius(Util.dp2px(40))
+
+            // Set the corner-radius of button.
+            .buttonCornerRadius(Util.dp2px(20))
+
+            // Whether the button is a circle shape.
+            .isRound(false)
     bmb.addBuilder(builder);
 }
 ```
 After adding builders to BMB, it is ready for a boom.
 
+### Square Button
+From version 2.0.8, BMB supports square buttons base on the circle buttons. To make boom-button square, use the following methods for a builder([Example](https://github.com/Nightonke/BoomMenu/blob/master/app/src/main/java/com/nightonke/boommenusample/SquareAndPieceCornerRadiusActivity.java)):  
+```
+        return new SimpleCircleButton.Builder()
+                .isRound(false)
+                .shadowCornerRadius(Util.dp2px(20))
+                .buttonCornerRadius(Util.dp2px(20))
+                .normalImageRes(getImageResource());
+```
+<img src="https://github.com/Nightonke/BoomMenu/blob/master/Pictures/pieceCornerRadius.png" width=300/>
+<img src="https://github.com/Nightonke/BoomMenu/blob/master/Pictures/square.png" width=300/>
+
+And to make the transformation natural, you may want to make the pieces square, too. Check the `setPieceCornerRadius` method and `app:bmb_pieceCornerRadius` attribute [here](https://github.com/Nightonke/BoomMenu/wiki/Attributes-for-BMB-or-Pieces-on-BMB#for-pieces-on-bmb) to achieve that effect.
+
 ### Piece Place Enum for Simple Circle Button
 All piece-place-enum and button-place-enum can be found in [demo](https://github.com/Nightonke/BoomMenu/blob/master/app/src/main/java/com/nightonke/boommenusample/SimpleCircleButtonActivity.java).