[gui][magnification] Update widget to use correct dataset method

darfix/gui/magnificationWidget.py

@@ -26,7 +26,7 @@
 
 __authors__ = ["J. Garriga"]
 __license__ = "MIT"
-__date__ = "02/06/2021"
+__date__ = "04/06/2021"
 
 
 from silx.gui import qt
@@ -34,7 +34,7 @@ from silx.gui import qt
 
 class MagnificationWidget(qt.QMainWindow):
     """
-    Widget to apply PCA to a set of images and plot the eigenvalues found.
+    Widget to apply magnification transformation to the data axes.
     """
     sigComputed = qt.Signal()
 
@@ -80,7 +80,15 @@ class MagnificationWidget(qt.QMainWindow):
         self.indices = indices
         self.bg_indices = bg_indices
         self.bg_dataset = bg_dataset
-        self._okButton.setEnabled(True)
+
+        if not self.dataset.dims:
+            msg = qt.QMessageBox()
+            msg.setIcon(qt.QMessageBox.Warning)
+            msg.setText("This widget has to be used before selecting any region of \
+                         interest and after selecting the dimensions")
+            msg.exec_()
+        else:
+            self._okButton.setEnabled(True)
 
     def getDataset(self):
         return self.dataset, self.indices, self.bg_indices, self.bg_dataset
@@ -108,9 +116,9 @@ class MagnificationWidget(qt.QMainWindow):
     def _saveMagnification(self):
 
         if self._checkbox2x.isChecked():
-            self.dataset.magnification = 0.00375
+            d = 3.75
         elif self._checkbox10x.isChecked():
-            self.dataset.magnification = 0.00075
+            d = 0.75
         else:
             magnification = self._manualLE.text()
             if magnification == "":
@@ -119,7 +127,7 @@ class MagnificationWidget(qt.QMainWindow):
                 msg.setText("Magnification value has to be entered when choosing manual")
                 msg.exec_()
                 return
-            else:
-                self.dataset.magnification = float(magnification)
+
+        self.dataset.compute_transformation(d)
 
         self.sigComputed.emit()