Python vispy.app.run() Examples

def sheet_view(sheet, coords=None, interactive=True, **draw_specs_kw):
    """Uses VisPy to display an epithelium
    """
    draw_specs = sheet_spec()
    spec_updater(draw_specs, draw_specs_kw)

    if coords is None:
        coords = ["x", "y", "z"]
    canvas = scene.SceneCanvas(keys="interactive", show=True, size=(1240, 720))
    view = canvas.central_widget.add_view()
    view.camera = "turntable"
    view.camera.aspect = 1
    view.bgcolor = vp.color.Color("#222222")
    if draw_specs["edge"]["visible"]:
        wire = edge_visual(sheet, coords, **draw_specs["edge"])
        view.add(wire)
    if draw_specs["face"]["visible"]:
        mesh = face_visual(sheet, coords, **draw_specs["face"])
        view.add(mesh)

    canvas.show()
    view.camera.set_range()
    if interactive:
        app.run()
    return canvas, view 

def setup():
    """Called to setup initial sketch options.

    The `setup()` function is run once when the program starts and is
    used to define initial environment options for the sketch.

    """
    pass 

def save_frame(filename="screen.png"):
    """Save a numbered sequence of images whenever the function is run.

    Saves a numbered sequence of images, one image each time the
    function is run. To save an image that is identical to the display
    window, run the function at the end of :meth:`p5.draw` or within
    mouse and key events such as :meth:`p5.mouse_pressed` and
    :meth:`p5.key_pressed`. 

    If save_frame() is used without parameters, it will save files as
    screen-0000.png, screen-0001.png, and so on. Append a file
    extension, to indicate the file format to be used. Image files are
    saved to the sketch's folder. Alternatively, the files can be
    saved to any location on the computer by using an absolute path
    (something that starts with / on Unix and Linux, or a drive letter
    on Windows).

    :param filename: name (or name with path) of the image file.
        (defaults to ``screen.png``)

    :type filename: str

    """
    # todo: allow setting the frame number in the file name of the
    # saved image (instead of using the default sequencing) --abhikpal
    # (2018-08-14)
    p5.sketch.queue_screenshot(filename) 

def render(model, im_size, K, R, t, clip_near=100, clip_far=2000,
           surf_color=None, bg_color=(0.0, 0.0, 0.0, 0.0),
           ambient_weight=0.1, mode='rgb+depth'):

    # Process input data
    #---------------------------------------------------------------------------
    # Make sure vertices and faces are provided in the model
    assert({'pts', 'faces'}.issubset(set(model.keys())))

    # Set color of vertices
    if not surf_color:
        if 'colors' in model.keys():
            assert(model['pts'].shape[0] == model['colors'].shape[0])
            colors = model['colors']
            if colors.max() > 1.0:
                colors /= 255.0 # Color values are expected to be in range [0, 1]
        else:
            colors = np.ones((model['pts'].shape[0], 4), np.float32) * 0.5
    else:
        colors = np.tile(list(surf_color) + [1.0], [model['pts'].shape[0], 1])
    vertices_type = [('a_position', np.float32, 3),
                     #('a_normal', np.float32, 3),
                     ('a_color', np.float32, colors.shape[1])]
    vertices = np.array(list(zip(model['pts'], colors)), vertices_type)

    # Rendering
    #---------------------------------------------------------------------------
    render_rgb = mode in ['rgb', 'rgb+depth']
    render_depth = mode in ['depth', 'rgb+depth']
    c = _Canvas(vertices, model['faces'], im_size, K, R, t, clip_near, clip_far,
                bg_color, ambient_weight, render_rgb, render_depth)
    app.run()

    #---------------------------------------------------------------------------
    if mode == 'rgb':
        out = c.rgb
    elif mode == 'depth':
        out = c.depth
    elif mode == 'rgb+depth':
        out = c.rgb, c.depth
    else:
        out = None
        print('Error: Unknown rendering mode.')
        exit(-1)

    c.close()
    return out