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Customizable camera linking does not work #783

@kushalkolar

Description

@kushalkolar

Not sure why, pygfx demo works, fpl is doing something additional I think:

import numpy as np
import fastplotlib as fpl
import pygfx

xs = np.linspace(0, 2 * np.pi, 100)
ys = np.sin(xs)

ys_big = np.random.rand(100) * 10

# create cameras, fov=0 means Orthographic projection
camera1 = pygfx.PerspectiveCamera(fov=0)
camera2 = pygfx.PerspectiveCamera(fov=0)

# create controllers, first add the "main" camera for the subplot
controller1 = pygfx.PanZoomController(camera1)
controller2 = pygfx.PanZoomController(camera2)

# add the other camera to each controller, but only include the 'x' state, i.e. 'y' for height is not included
# this must be done only after adding the "main" cameras to the controller as done above
controller1.add_camera(camera2, include_state={"x", "width"})
controller2.add_camera(camera1, include_state={"x", "width"})

# create figure using these cameras and controllers
figure = fpl.Figure(
    shape=(2, 1),
    cameras=[camera1, camera2],
    controllers=[controller1, controller2],
    size=(700, 560)
)


figure[0, 0].add_line(np.column_stack([xs, ys_big]))
figure[1, 0].add_line(np.column_stack([xs, ys]))

print(controller1._cameras)
print(controller2._cameras)

for subplot in figure:
    subplot.camera.zoom = 1.0

figure.show(maintain_aspect=False, autoscale=False)

I did make the following change to PlotArea:

Index: fastplotlib/layouts/_plot_area.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/fastplotlib/layouts/_plot_area.py b/fastplotlib/layouts/_plot_area.py
--- a/fastplotlib/layouts/_plot_area.py	
+++ b/fastplotlib/layouts/_plot_area.py	(date 1743405901011)
@@ -79,7 +79,9 @@
         self._camera = camera
         self._controller = controller
 
-        self.controller.add_camera(self._camera)
+        if self.camera not in self.controller.cameras:
+            self.controller.add_camera(self._camera)
+
         self.controller.register_events(
             self.viewport,
         )

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