add pyqtgraph example

Author: jordens

examples/view.py

@@ -0,0 +1,78 @@
+from __future__ import (print_function, unicode_literals, division,
+        absolute_import)
+
+import time
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtCore, QtGui
+
+from pydc1394 import Camera
+
+
+class CameraPlot:
+    def __init__(self, camera):
+        self.camera = camera
+        self.init_win()
+        self.init_camera()
+    
+    def init_win(self):
+        self.win = QtGui.QMainWindow()
+        self.win.show()
+        self.win.resize(600, 400)
+        self.win.setWindowTitle("pydc1394 + pyqtgraph")
+        self.img = pg.ImageView()
+        self.win.setCentralWidget(self.img)
+
+    def init_camera(self):
+        print("Vendor:", self.camera.vendor)
+        print("Model:", self.camera.model)
+        print("GUID:", self.camera.guid)
+        print("Mode:", self.camera.mode)
+        print("Framerate: ", self.camera.rate)
+        print("Available modes", [mode.name for mode in self.camera.modes])
+        print("Available features", self.camera.features)
+        #modes = self.camera.modes
+        #self.camera.mode = modes[0]
+       
+    def start_camera(self):
+        self.camera.start_capture()
+        self.camera.start_video()
+
+    def process_images(self):
+        QtCore.QTimer.singleShot(50, self.process_images)
+        frame = None
+        while True:
+            frame_ = self.camera.dequeue(poll=True)
+            if frame_ is not None:
+                if frame is not None:
+                    frame.enqueue()
+                frame = frame_
+            else:
+                break
+        if frame is None:
+            return
+        im = frame.copy().T
+        frame.enqueue()
+        self.img.setImage(im, autoRange=False, autoLevels=False,
+            autoHistogramRange=False)
+
+    def stop_camera(self):
+        self.camera.stop_video()
+        self.camera.stop_capture()
+        
+    def deinit_camera(self):
+        pass
+
+    
+if __name__ == "__main__":
+    app = QtGui.QApplication([])
+    cam = CameraPlot(Camera())
+    try:
+        cam.start_camera()
+        time.sleep(.5)
+        cam.process_images()
+        cam.img.autoRange()
+        cam.img.autoLevels()
+        QtGui.QApplication.instance().exec_()
+    finally:
+        cam.stop_camera()
+        cam.deinit_camera()