RangeFinder: remove raw_value, orientation variables

This saves 10bytes of RAM

libraries/AP_RangeFinder/RangeFinder.cpp

@@ -25,21 +25,13 @@
 
 // Public Methods //////////////////////////////////////////////////////////////
 
-void RangeFinder::set_orientation(int x, int y, int z)
+// Read Sensor data - post of the ahrd work is done by the child class's convert_raw_to_distance
+int16_t RangeFinder::read()
 {
-    orientation_x = x;
-    orientation_y = y;
-    orientation_z = z;
-}
-
-// Read Sensor data - only the raw_value is filled in by this parent class
-int RangeFinder::read()
-{
-    int temp_dist;
+    int16_t temp_dist;
 
-    raw_value = _analog_source->read_average();
     // convert analog value to distance in cm (using child implementation most likely)
-    temp_dist = convert_raw_to_distance(raw_value);
+    temp_dist = convert_raw_to_distance(_analog_source->read_average());
 
     // ensure distance is within min and max
     temp_dist = constrain_float(temp_dist, min_distance, max_distance);

libraries/AP_RangeFinder/RangeFinder.h

@@ -26,33 +26,28 @@ protected:
         _mode_filter(filter) {
     }
 public:
-    // raw_value: read the sensor
-    int  raw_value;
     // distance: in cm
-    int  distance;
+    int16_t  distance;
     // maximum measurable distance: in cm
-    int  max_distance;
+    int16_t  max_distance;
     // minimum measurable distance: in cm
-    int  min_distance;
-
-    int  orientation_x, orientation_y, orientation_z;
-    void set_orientation(int x, int y, int z);
+    int16_t  min_distance;
 
     /**
      * convert_raw_to_distance:
      * function that each child class should override to convert voltage
      * to distance (in cm)
      */
-    virtual int convert_raw_to_distance(int _raw_value) {
-        return _raw_value;
+    virtual int16_t convert_raw_to_distance(int16_t raw_value) {
+        return raw_value;
     }
     /**
      * read:
      * read value from sensor and return distance in cm
      */
-    virtual int read();
+    virtual int16_t read();
 
-    AP_HAL::AnalogSource*       _analog_source;
+    AP_HAL::AnalogSource*   _analog_source;
     FilterInt16 *           _mode_filter;
 };
 #endif // __RANGEFINDER_H__