def __init__(self):
app.Canvas.__init__(self,
title='Arrows example',
keys='interactive',
size=(1050, 650))
line1 = curves.curve4_bezier((10.0, 0.0), (50, -190), (350, 190),
(390, 0.0))
arrows1 = np.array([line1[-2], line1[-1]]).reshape((1, 4))
line2 = curves.curve4_bezier((10.0, 0.0), (190, -190), (210, 190),
(390, 0.0))
arrows2 = np.array([line2[1], line2[0], line2[-2], line2[-1]]).reshape(
(2, 4))
line3 = curves.curve3_bezier((10.0, 0.0), (50, 190), (390, 0.0))
arrows3 = np.array([line3[-2], line3[-1]]).reshape((1, 4))
arrow_types = ["curved", "stealth", "inhibitor_round", "angle_60"]
self.lines = []
for i, arrow_type in enumerate(arrow_types):
arrows = [
visuals.ArrowVisual(line1,
color='w',
width=6,
method='agg',
arrows=arrows1,
arrow_type=arrow_type,
arrow_size=30.0),
visuals.ArrowVisual(line2,
color='w',
width=2,
method='agg',
arrows=arrows2,
arrow_type=arrow_type,
arrow_size=5.0),
visuals.ArrowVisual(line3,
color='w',
width=4,
method='agg',
arrows=arrows3,
arrow_type=arrow_type,
arrow_size=10.0)
]
# Translate each line visual downwards
for j, visual in enumerate(arrows):
x = 50 + (i * 250)
y = 100 + (200 * j)
visual.transform = STTransform(translate=[x, y],
scale=(0.5, 1.0))
visual.events.update.connect(lambda event: self.update())
self.lines.extend(arrows)
self.show()
def __init__(self):
app.Canvas.__init__(self,
title="Quiver plot",
keys="interactive",
size=(830, 430))
self.arrow_length = 20
self.grid_coords = None
self.line_vertices = None
self.last_mouse = (0, 0)
self.generate_grid()
self.visual = visuals.ArrowVisual(color='white',
connect='segments',
arrow_size=8)
self.visual.events.update.connect(lambda evt: self.update())
self.visual.transform = NullTransform()
self.show()