Actually commit the code changes which impliment a "scale" animation type.

simgear/scene/model/animation.cxx

@@ -79,6 +79,18 @@ set_translation (sgMat4 &matrix, double position_m, sgVec3 &axis)
   sgMakeTransMat4(matrix, xyz);
 }
 
+/**
+ * Set up the transform matrix for a scale operation.
+ */
+static void
+set_scale (sgMat4 &matrix, double x, double y, double z)
+{
+  sgMakeIdentMat4( matrix );
+  matrix[0][0] = x;
+  matrix[1][1] = y;
+  matrix[2][2] = z;
+}
+
 /**
  * Modify property value by step and scroll settings in texture translations
  */
@@ -449,6 +461,80 @@ SGTranslateAnimation::update()
 }
 
 
+
+////////////////////////////////////////////////////////////////////////
+// Implementation of SGScaleAnimation
+////////////////////////////////////////////////////////////////////////
+
+SGScaleAnimation::SGScaleAnimation( SGPropertyNode *prop_root,
+                                        SGPropertyNode_ptr props )
+  : SGAnimation(props, new ssgTransform),
+      _prop((SGPropertyNode *)prop_root->getNode(props->getStringValue("property", "/null"), true)),
+    _x_factor(props->getDoubleValue("x-factor", 1.0)),
+    _y_factor(props->getDoubleValue("y-factor", 1.0)),
+    _z_factor(props->getDoubleValue("z-factor", 1.0)),
+    _x_offset(props->getDoubleValue("x-offset", 1.0)),
+    _y_offset(props->getDoubleValue("y-offset", 1.0)),
+    _z_offset(props->getDoubleValue("z-offset", 1.0)),
+    _table(read_interpolation_table(props)),
+    _has_min_x(props->hasValue("x-min")),
+    _has_min_y(props->hasValue("y-min")),
+    _has_min_z(props->hasValue("z-min")),
+    _min_x(props->getDoubleValue("x-min")),
+    _min_y(props->getDoubleValue("y-min")),
+    _min_z(props->getDoubleValue("z-min")),
+    _has_max_x(props->hasValue("x-max")),
+    _has_max_y(props->hasValue("y-max")),
+    _has_max_z(props->hasValue("z-max")),
+    _max_x(props->getDoubleValue("x-max")),
+    _max_y(props->getDoubleValue("y-max")),
+    _max_z(props->getDoubleValue("z-max"))
+{
+}
+
+SGScaleAnimation::~SGScaleAnimation ()
+{
+  delete _table;
+}
+
+void
+SGScaleAnimation::update()
+{
+  if (_table == 0) {
+      _x_scale = _prop->getDoubleValue() * _x_factor + _x_offset;
+    if (_has_min_x && _x_scale < _min_x)
+      _x_scale = _min_x;
+    if (_has_max_x && _x_scale > _max_x)
+      _x_scale = _max_x;
+  } else {
+    _x_scale = _table->interpolate(_prop->getDoubleValue());
+  }
+
+  if (_table == 0) {
+    _y_scale = _prop->getDoubleValue() * _y_factor + _y_offset;
+    if (_has_min_y && _y_scale < _min_y)
+      _y_scale = _min_y;
+    if (_has_max_y && _y_scale > _max_y)
+      _y_scale = _max_y;
+  } else {
+    _y_scale = _table->interpolate(_prop->getDoubleValue());
+  }
+
+  if (_table == 0) {
+    _z_scale = _prop->getDoubleValue() * _z_factor + _z_offset;
+    if (_has_min_z && _z_scale < _min_z)
+      _z_scale = _min_z;
+    if (_has_max_z && _z_scale > _max_z)
+      _z_scale = _max_z;
+  } else {
+    _z_scale = _table->interpolate(_prop->getDoubleValue());
+  }
+
+  set_scale(_matrix, _x_scale, _y_scale, _z_scale );
+  ((ssgTransform *)_branch)->setTransform(_matrix);
+}
+
+
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGTexRotateAnimation
 ////////////////////////////////////////////////////////////////////////

simgear/scene/model/animation.hxx

@@ -221,6 +221,43 @@ private:
   sgVec3 _axis;
 };
 
+/**
+ * Animation to scale an object.
+ */
+class SGScaleAnimation : public SGAnimation
+{
+public:
+  SGScaleAnimation( SGPropertyNode *prop_root,
+                        SGPropertyNode_ptr props );
+  virtual ~SGScaleAnimation ();
+  virtual void update();
+private:
+  SGPropertyNode_ptr _prop;
+  double _x_factor;
+  double _y_factor;
+  double _z_factor;
+  double _x_offset;
+  double _y_offset;
+  double _z_offset;
+  SGInterpTable * _table;
+  bool _has_min_x;
+  bool _has_min_y;
+  bool _has_min_z;
+  double _min_x;
+  double _min_y;
+  double _min_z;
+  bool _has_max_x;
+  bool _has_max_y;
+  bool _has_max_z;
+  double _max_x;
+  double _max_y;
+  double _max_z;
+  double _x_scale;
+  double _y_scale;
+  double _z_scale;
+  sgMat4 _matrix;
+};
+
 /**
  * Animation to rotate texture mappings around a center point.
  *

simgear/scene/model/model.cxx

@@ -121,6 +121,8 @@ sgMakeAnimation( ssgBranch * model,
     animation = new SGRotateAnimation(prop_root, node);
   } else if (!strcmp("translate", type)) {
     animation = new SGTranslateAnimation(prop_root, node);
+  } else if (!strcmp("scale", type)) {
+    animation = new SGScaleAnimation(prop_root, node);
   } else if (!strcmp("texrotate", type)) {
     animation = new SGTexRotateAnimation(prop_root, node);
   } else if (!strcmp("textranslate", type)) {