scaler.rb in tracksperanto-2.0.2

- old
+ new

@@ -6,11 +6,12 @@
   cast_to_float :x_factor, :y_factor
   
   # Called on export start
   def start_export( img_width, img_height)
     set_residual_factor
-    super( (img_width * x_factor).to_i, (img_height * y_factor).to_i)
+    @w, @h = (img_width * x_factor).to_i.abs, (img_height * y_factor).to_i.abs
+    super(@w, @h)
   end
   
   def y_factor
     @y_factor || DEFAULT_FACTOR
   end
@@ -18,12 +19,14 @@
   def x_factor
     @x_factor || DEFAULT_FACTOR
   end
   
   def export_point(frame, float_x, float_y, float_residual)
-    super(frame, 
-      (float_x * x_factor), 
-      (float_y * y_factor), 
+    return super if @y_factor == DEFAULT_FACTOR && @x_factor == DEFAULT_FACTOR
+    
+    super(frame,
+      x_factor < 0 ? (@w + (float_x * x_factor)) : (float_x * x_factor),
+      y_factor < 0 ? (@h + (float_y * y_factor)) : (float_y * y_factor),
       (float_residual * @residual_factor)
     )
   end
   
   private
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