Merge branch 'termim-fixes' into develop

CHANGELOG

@@ -11,6 +11,7 @@ pyqtgraph-0.9.9  [unreleased]
     - Speed improvements in functions.makeARGB
     - ImageItem is faster by avoiding makeQImage(transpose=True)
     - ComboBox will raise error when adding multiple items of the same name
+    - ArrowItem.setStyle now updates style options rather than replacing them 
 
   New Features:
     - New HDF5 example for working with very large datasets

examples/Arrow.py

@@ -2,7 +2,7 @@
 """
 Display an animated arrowhead following a curve.
 This example uses the CurveArrow class, which is a combination
-of ArrowItem and CurvePoint. 
+of ArrowItem and CurvePoint.
 
 To place a static arrow anywhere in a scene, use ArrowItem.
 To attach other types of item to a curve, use CurvePoint.
@@ -45,6 +45,7 @@ p.setRange(QtCore.QRectF(-20, -10, 60, 20))
 ## Animated arrow following curve
 c = p2.plot(x=np.sin(np.linspace(0, 2*np.pi, 1000)), y=np.cos(np.linspace(0, 6*np.pi, 1000)))
 a = pg.CurveArrow(c)
+a.setStyle(headLen=40)
 p2.addItem(a)
 anim = a.makeAnimation(loop=-1)
 anim.start()

examples/SimplePlot.py

@@ -1,15 +1,10 @@
 import initExample ## Add path to library (just for examples; you do not need this)
 
-from pyqtgraph.Qt import QtGui, QtCore
 import pyqtgraph as pg
 import numpy as np
 plt = pg.plot(np.random.normal(size=100), title="Simplest possible plotting example")
-plt.getAxis('bottom').setTicks([[(x*20, str(x*20)) for x in range(6)]])
-## Start Qt event loop unless running in interactive mode or using pyside.
-ex = pg.exporters.SVGExporter.SVGExporter(plt.plotItem.scene())
-ex.export('/home/luke/tmp/test.svg')
 
 if __name__ == '__main__':
     import sys
-    if sys.flags.interactive != 1 or not hasattr(QtCore, 'PYQT_VERSION'):
+    if sys.flags.interactive != 1 or not hasattr(pg.QtCore, 'PYQT_VERSION'):
         pg.QtGui.QApplication.exec_()

pyqtgraph/graphicsItems/ArrowItem.py

@@ -16,12 +16,14 @@ class ArrowItem(QtGui.QGraphicsPathItem):
         Arrows can be initialized with any keyword arguments accepted by 
         the setStyle() method.
         """
+        self.opts = {}
         QtGui.QGraphicsPathItem.__init__(self, opts.get('parent', None))
+
         if 'size' in opts:
             opts['headLen'] = opts['size']
         if 'width' in opts:
             opts['headWidth'] = opts['width']
-        defOpts = {
+        defaultOpts = {
             'pxMode': True,
             'angle': -150,   ## If the angle is 0, the arrow points left
             'pos': (0,0),
@@ -33,12 +35,9 @@ class ArrowItem(QtGui.QGraphicsPathItem):
             'pen': (200,200,200),
             'brush': (50,50,200),
         }
-        defOpts.update(opts)
+        defaultOpts.update(opts)
         
-        self.setStyle(**defOpts)
-        
-        self.setPen(fn.mkPen(defOpts['pen']))
-        self.setBrush(fn.mkBrush(defOpts['brush']))
+        self.setStyle(**defaultOpts)
         
         self.rotate(self.opts['angle'])
         self.moveBy(*self.opts['pos'])
@@ -60,9 +59,9 @@ class ArrowItem(QtGui.QGraphicsPathItem):
                           specified, ot overrides headWidth. default=25
         baseAngle         Angle of the base of the arrow head. Default is
                           0, which means that the base of the arrow head
-                          is perpendicular to the arrow shaft.
+                          is perpendicular to the arrow tail.
         tailLen           Length of the arrow tail, measured from the base
-                          of the arrow head to the tip of the tail. If
+                          of the arrow head to the end of the tail. If
                           this value is None, no tail will be drawn.
                           default=None
         tailWidth         Width of the tail. default=3
@@ -70,13 +69,16 @@ class ArrowItem(QtGui.QGraphicsPathItem):
         brush             The brush used to fill the arrow.
         ================= =================================================
         """
-        self.opts = opts
+        self.opts.update(opts)
         
         opt = dict([(k,self.opts[k]) for k in ['headLen', 'tipAngle', 'baseAngle', 'tailLen', 'tailWidth']])
         self.path = fn.makeArrowPath(**opt)
         self.setPath(self.path)
         
-        if opts['pxMode']:
+        self.setPen(fn.mkPen(self.opts['pen']))
+        self.setBrush(fn.mkBrush(self.opts['brush']))
+        
+        if self.opts['pxMode']:
             self.setFlags(self.flags() | self.ItemIgnoresTransformations)
         else:
             self.setFlags(self.flags() & ~self.ItemIgnoresTransformations)
@@ -121,4 +123,4 @@ class ArrowItem(QtGui.QGraphicsPathItem):
         return pad
         
         
-    
+    

pyqtgraph/graphicsItems/AxisItem.py

@@ -688,7 +688,7 @@ class AxisItem(GraphicsWidget):
         ## determine mapping between tick values and local coordinates
         dif = self.range[1] - self.range[0]
         if dif == 0:
-            xscale = 1
+            xScale = 1
             offset = 0
         else:
             if axis == 0:
@@ -806,10 +806,10 @@ class AxisItem(GraphicsWidget):
                 ## measure all text, make sure there's enough room
                 if axis == 0:
                     textSize = np.sum([r.height() for r in textRects])
-                    textSize2 = np.max([r.width() for r in textRects])
+                    textSize2 = np.max([r.width() for r in textRects]) if textRects else 0
                 else:
                     textSize = np.sum([r.width() for r in textRects])
-                    textSize2 = np.max([r.height() for r in textRects])
+                    textSize2 = np.max([r.height() for r in textRects]) if textRects else 0
 
                 ## If the strings are too crowded, stop drawing text now.
                 ## We use three different crowding limits based on the number

pyqtgraph/graphicsItems/CurvePoint.py

@@ -112,6 +112,6 @@ class CurveArrow(CurvePoint):
         self.arrow = ArrowItem.ArrowItem(**opts)
         self.arrow.setParentItem(self)
         
-    def setStyle(**opts):
+    def setStyle(self, **opts):
         return self.arrow.setStyle(**opts)