A couple of minor improvements

 + added hasFired() method to the view
 + do not draw shape if it is empty, i.e. radius == 0 or rect.isEmpty()

library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java

@@ -433,6 +433,10 @@ private void updateDismissButton() {
         }
     }
 
+    public boolean hasFired() {
+        return mPrefsManager.hasFired();
+    }
+
     /**
      * REDRAW LISTENER - this ensures we redraw after activity finishes laying out
      */

library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/CircleShape.java

@@ -47,7 +47,9 @@ public void setRadius(int radius) {
 
     @Override
     public void draw(Canvas canvas, Paint paint, int x, int y, int padding) {
-        canvas.drawCircle(x, y, radius + padding, paint);
+        if (radius > 0) {
+            canvas.drawCircle(x, y, radius + padding, paint);
+        }
     }
 
     @Override

library/src/main/java/uk/co/deanwild/materialshowcaseview/shape/RectangleShape.java

@@ -50,14 +50,15 @@ private void init() {
 
     @Override
     public void draw(Canvas canvas, Paint paint, int x, int y, int padding) {
-        canvas.drawRect(
-                rect.left + x - padding,
-                rect.top + y - padding,
-                rect.right + x + padding,
-                rect.bottom + y + padding,
-                paint
-        );
-        rect.offset(-x, -y);
+        if (!rect.isEmpty()) {
+            canvas.drawRect(
+                    rect.left + x - padding,
+                    rect.top + y - padding,
+                    rect.right + x + padding,
+                    rect.bottom + y + padding,
+                    paint
+            );
+        }
     }
 
     @Override