small TargetItem fixes (#1715)

* angle is just an int, not a method

* more TargetItem use in the example

* offset is needed before super sometimes

* use setLabel, too

examples/InfiniteLine.py

@@ -32,33 +32,29 @@ p1.addItem(inf1)
 p1.addItem(inf2)
 p1.addItem(inf3)
 
-targetItem1 = pg.TargetItem(
+targetItem1 = pg.TargetItem()
-    label=True,
-    symbol="crosshair",
-    labelOpts={
-        "angle": 0
-    }
-)
 
 targetItem2 = pg.TargetItem(
     pos=(30, 5),
     size=20,
-    label="vert={1:0.2f}",
     symbol="star",
     pen="#F4511E",
+    label="vert={1:0.2f}",
     labelOpts={
-        "angle": 45,
         "offset": QtCore.QPoint(15, 15)
     }
 )
+targetItem2.label().setAngle(45)
 
 targetItem3 = pg.TargetItem(
     pos=(10, 10),
     size=10,
-    label="Third Label",
+    symbol="x",
-    symbol="x", 
     pen="#00ACC1",
-    labelOpts={
+)
+targetItem3.setLabel(
+    "Third Label",
+    {
         "anchor": QtCore.QPointF(0.5, 0.5),
         "offset": QtCore.QPointF(30, 0),
         "color": "#558B2F",
@@ -66,6 +62,7 @@ targetItem3 = pg.TargetItem(
     }
 )
 
+
 def callableFunction(x, y):
     return f"Square Values: ({x**2:.4f}, {y**2:.4f})"
 

pyqtgraph/graphicsItems/TargetItem.py

@@ -354,7 +354,7 @@ class TargetItem(UIGraphicsItem):
             DeprecationWarning,
             stacklevel=2,
         )
-        if self.label() is not None and angle != self.label().angle():
+        if self.label() is not None and angle != self.label().angle:
             self.label().setAngle(angle)
         return None
 
@@ -393,11 +393,6 @@ class TargetLabel(TextItem):
         anchor=(0, 0.5),
         **kwargs,
     ):
-        super().__init__(anchor=anchor, **kwargs)
-        self.setParentItem(target)
-        self.target = target
-        self.setFormat(text)
-
         if isinstance(offset, Point):
             self.offset = offset
         elif isinstance(offset, (tuple, list)):
@@ -406,6 +401,12 @@ class TargetLabel(TextItem):
             self.offset = Point(offset.x(), offset.y())
         else:
             raise TypeError("Offset parameter is the wrong data type")
+
+        super().__init__(anchor=anchor, **kwargs)
+        self.setParentItem(target)
+        self.target = target
+        self.setFormat(text)
+
         self.target.sigPositionChanged.connect(self.valueChanged)
         self.valueChanged()