First application

Note

More documentation to read about this example at:

Here it is shown how to create the first pyforms app.

Create the first app

Create the file example.py and add the next code to it.

from pyforms.basewidget import BaseWidget
from pyforms.controls   import ControlFile
from pyforms.controls   import ControlText
from pyforms.controls   import ControlSlider
from pyforms.controls   import ControlPlayer
from pyforms.controls   import ControlButton

class ComputerVisionAlgorithm(BaseWidget):

    def __init__(self, *args, **kwargs):
        super().__init__('Computer vision algorithm example')

        #Definition of the forms fields
        self._videofile     = ControlFile('Video')
        self._outputfile    = ControlText('Results output file')
        self._threshold     = ControlSlider('Threshold', default=114, minimum=0, maximum=255)
        self._blobsize      = ControlSlider('Minimum blob size', default=110, minimum=100, maximum=2000)
        self._player        = ControlPlayer('Player')
        self._runbutton     = ControlButton('Run')

        #Define the function that will be called when a file is selected
        self._videofile.changed_event     = self.__videoFileSelectionEvent
        #Define the event that will be called when the run button is processed
        self._runbutton.value       = self.__runEvent
        #Define the event called before showing the image in the player
        self._player.process_frame_event    = self.__process_frame

        #Define the organization of the Form Controls
        self._formset = [
            ('_videofile', '_outputfile'),
            '_threshold',
            ('_blobsize', '_runbutton'),
            '_player'
        ]


    def __videoFileSelectionEvent(self):
        """
        When the videofile is selected instanciate the video in the player
        """
        self._player.value = self._videofile.value

    def __process_frame(self, frame):
        """
        Do some processing to the frame and return the result frame
        """
        return frame

    def __runEvent(self):
        """
        After setting the best parameters run the full algorithm
        """
        pass


if __name__ == '__main__':

    from pyforms import start_app
    start_app(ComputerVisionAlgorithm)

Now execute in the terminal the next command:

$ python example.py

You will visualize the next result:

../_images/gui-example-computervisionalgorithm.png