toward trace of camera

swissmx.py

@@ -410,6 +410,13 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
     #bm.setTransform(tr)  # assign transform
     grp.addItem(obj)
 
+    #--- camera tracong images ---
+    self._goTrace=grp=pg.ItemGroup() # the transformation is the same as for tracked objects
+    grp.setZValue(-20) #lower than other objects
+    self.vb.addItem(grp)
+
+
+
     #--- testing scan grid ---
     #self.track_objects() # first call is needed to initialize the structure self._goTracked
     # #go=UsrGO.Grid((120, -100), (200, 150), (30, 22), 2)
@@ -1070,12 +1077,29 @@ class WndSwissMx(QMainWindow, Ui_MainWindow):
         pFix=pg.Point(self._goFixGrp.mapFromScene(pos))
         pFix-=bm.pos()+bm.size()/2
 
+
+        #create trace
+        img=pg.ImageItem(self._goImg.image)
+        img.setZValue(100)
+        trImg=self._goImgGrp.transform()
+        trTrk=self._goTracked.transform()
+
+        tr=trImg*trTrk.inverted()[0] #TODO: check if oder correct !!!
+        #tr.scale(.5,.5)
+        img.setTransform(tr)
+
+        self._goTrace.addItem(img)
+
         _log.debug(f'dist to beam ({pFix[0]:>0.6g} {pFix[1]:>0.6g}mm)')
         fx_motor=self.tweakers["fast_x"]
         fy_motor=self.tweakers["fast_y"]
 
         fx_motor.move_rel(pFix[0])
         fy_motor.move_rel(pFix[1])
+        self._goTrace.setTransform(self._goTracked.transform())
+
+
+
         #fx_motor.move_abs(fx_motor.get_val()+pFix[0])
         #fy_motor.move_abs(fy_motor.get_val()+pFix[1])