more log fixes

svn path=/trunk/matplotlib/; revision=956

Author: jdh2358

src/_transforms.cpp

@@ -901,7 +901,13 @@ Transformation::nonlinear_only_numerix(const Py::Tuple & args) {
     double thisx = *(double *)(x->data + i*x->strides[0]);
     double thisy = *(double *)(y->data + i*y->strides[0]);
     //std::cout << "calling operator " << thisx << " " << thisy << " " << std::endl;
-    this->nonlinear_only_api(&thisx, &thisy);
+    try {
+      this->nonlinear_only_api(&thisx, &thisy);
+    }
+    catch (std::domain_error &err) {
+      throw Py::ValueError("Domain error on this->nonlinear_only_api(&thisx, &thisy) in Transformation::nonlinear_only_numerix");  
+    }
+
     *(double *)(retx->data + i*retx->strides[0]) = thisx;
     *(double *)(rety->data + i*rety->strides[0]) = thisy;
   }

src/_transforms.h

@@ -483,7 +483,14 @@ class Transformation: public Py::PythonExtension<Transformation> {
 
   Py::Object as_vec6_val(const Py::Tuple &args) {
     double a,b,c,d,tx,ty;
-    affine_params_api(&a, &b, &c, &d, &tx, &ty);
+    
+    try { 
+      affine_params_api(&a, &b, &c, &d, &tx, &ty);
+    }
+  catch (std::domain_error &err) {
+    throw Py::ValueError("Domain error on as_vec6_val in Transformation::as_vec6_val");  
+  }
+
     Py::Tuple ret(6);
     ret[0] = Py::Float(a);
     ret[1] = Py::Float(b);