updated arrow example

examples/Arrow.py

@@ -15,17 +15,35 @@ import pyqtgraph as pg
 
 
 app = QtGui.QApplication([])
-mw = QtGui.QMainWindow()
-mw.resize(300,300)
 
-p = pg.PlotWidget()
-mw.setCentralWidget(p)
-c = p.plot(x=np.sin(np.linspace(0, 2*np.pi, 1000)), y=np.cos(np.linspace(0, 6*np.pi, 1000)))
+w = QtGui.QMainWindow()
+cw = pg.GraphicsLayoutWidget()
+w.show()
+w.resize(400,600)
+w.setCentralWidget(cw)
+
+p = cw.addPlot(row=0, col=0)
+p2 = cw.addPlot(row=1, col=0)
+
+## variety of arrow shapes
+a1 = pg.ArrowItem(angle=-160, tipAngle=60, headLen=40, tailLen=40, tailWidth=20, pen={'color': 'w', 'width': 3})
+a2 = pg.ArrowItem(angle=-120, tipAngle=30, baseAngle=20, headLen=40, tailLen=40, tailWidth=8, pen=None, brush='y')
+a3 = pg.ArrowItem(angle=-60, tipAngle=30, baseAngle=20, headLen=40, tailLen=None, brush=None)
+a4 = pg.ArrowItem(angle=-20, tipAngle=30, baseAngle=-30, headLen=40, tailLen=None)
+a2.setPos(10,0)
+a3.setPos(20,0)
+a4.setPos(30,0)
+p.addItem(a1)
+p.addItem(a2)
+p.addItem(a3)
+p.addItem(a4)
+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)
-p.addItem(a)
-
-mw.show()
-
+p2.addItem(a)
 anim = a.makeAnimation(loop=-1)
 anim.start()