optimize view iteractions

pyqtUsrObj.py

@@ -515,34 +515,58 @@ class FixTargetFrame(pg.ROI):
     param['trf']=trf
     return param
 
-class TxtROI(pg.ROI):
-  def __init__(self, pos, size, **kargs):
-    pg.ROI.__init__(self, pos, size, **kargs)
-
-  def paint(self, p, *args):
-    #pg.ROI.paint(self, p, *args)
-    r=QtCore.QRectF(0, 0, self.state['size'][0], self.state['size'][1]).normalized()
-
-    p.setRenderHint(QtGui.QPainter.Antialiasing)
-    p.setPen(self.currentPen)
-    #p.translate(r.left(), r.top())
-    #p.scale(r.width(), r.height())
-    #p.drawRect(0, 0, 1, 1)
-    p.drawRect(r)
-    tr=p.worldTransform()
-    obj_info(tr)
-    tr.setMatrix(tr.m11(),tr.m12(),tr.m13(),tr.m21(),-tr.m22(),tr.m23(),tr.m31(),tr.m32(),tr.m33())
-    p.setWorldTransform(tr)
-    obj_info(tr)
-    obj_info(p.transform())
-    obj_info(p.worldTransform())
-    f=p.font();
-    f.setPixelSize(15)
-    p.setFont(f)
-    p.drawText(0, 5, 'Thierry')
 
 ## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__=='__main__':
+  # TODO: pg.ItemGroup does not support bounding box and therefore vb.autoRange() does not work
+  class ItemGroup(pg.ItemGroup):
+    # own item group that supports bounding rect
+    def __init__(self, *args, **kargs):
+      pg.ItemGroup.__init__(self, *args, **kargs)
+
+    def boundingRect(self):
+      # tr=self.transform()
+      boRects=[]
+      for item in self.childItems():
+        boRects.append(item.boundingRect())
+      if boRects:
+        # r=QtCore.QRectF(tr.map(boRects[0].bottomRight()),tr.map(boRects[0].topLeft()))
+        return boRects[0]
+      else:
+        return pg.ItemGroup.boundingRect(self)
+
+    def addItem(self, *args, **kargs):
+      self.setFlag(self.ItemHasNoContents, False)
+      pg.ItemGroup.addItem(self, *args, **kargs)
+
+
+  class TxtROI(pg.ROI):
+    def __init__(self, pos, size, **kargs):
+      pg.ROI.__init__(self, pos, size, **kargs)
+
+    def paint(self, p, *args):
+      # pg.ROI.paint(self, p, *args)
+      r=QtCore.QRectF(0, 0, self.state['size'][0], self.state['size'][1]).normalized()
+
+      p.setRenderHint(QtGui.QPainter.Antialiasing)
+      p.setPen(self.currentPen)
+      # p.translate(r.left(), r.top())
+      # p.scale(r.width(), r.height())
+      # p.drawRect(0, 0, 1, 1)
+      p.drawRect(r)
+      tr=p.worldTransform()
+      obj_info(tr)
+      tr.setMatrix(tr.m11(), tr.m12(), tr.m13(), tr.m21(), -tr.m22(), tr.m23(), tr.m31(), tr.m32(), tr.m33())
+      p.setWorldTransform(tr)
+      obj_info(tr)
+      obj_info(p.transform())
+      obj_info(p.worldTransform())
+      f=p.font();
+      f.setPixelSize(15)
+      p.setFont(f)
+      p.drawText(0, 5, 'Thierry')
+
+
   import sys
   import argparse
   #(h, t)=os.path.split(sys.argv[0]);cmd='\n  '+(t if len(h)>20 else sys.argv[0])+' '
@@ -638,6 +662,7 @@ if __name__=='__main__':
   w.setWindowTitle('pyqtgraph example: ROI Examples')
 
   vb=w.addViewBox(row=1, col=0, lockAspect=True,invertY=False)
+  vb.enableAutoRange(enable=False)
   try:
     g=pg.GridItem(pen=(0, 255, 0), textPen=(0, 255, 0))  # green grid and labels
   except: