gui: update easing functions to use arcade.anim

Author: eruvanos

arcade/examples/gui/transitions.py

@@ -1,10 +1,22 @@
 import arcade
-from arcade.easing import linear
+from arcade.anim import Easing
 from arcade.gui import UIManager, TransitionChain, TransitionAttr, TransitionAttrIncr
 from arcade.gui.transition import TransitionAttrSet
 from arcade.gui.widgets.buttons import UIFlatButton
 
 
+class AutoSizeButton(UIFlatButton):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.ui_label.fit_content()
+
+    def prepare_layout(self):
+        # update size hint min to fit children
+        min_w = max(map(lambda c: c.width, self.children))
+        min_h = max(map(lambda c: c.height, self.children))
+        self.size_hint_min = (min_w, min_h)
+
+
 class DemoWindow(arcade.Window):
     def __init__(self):
         super().__init__(800, 600, "UI Mockup", resizable=True)
@@ -14,7 +26,7 @@ def __init__(self):
         self.manager = UIManager()
         self.manager.enable()
 
-        button = self.manager.add(UIFlatButton(text="Click me I can move!"))
+        button = self.manager.add(AutoSizeButton(text="Click me I can move!"))
         button.center_on_screen()
 
         @button.event
@@ -29,16 +41,20 @@ def on_click(event):
             chain.add(TransitionAttrIncr(attribute="center_x", increment=100, duration=1.0))
             chain.add(
                 TransitionAttrIncr(
-                    attribute="center_y", increment=100, duration=1, ease_function=linear
+                    attribute="center_y", increment=100, duration=1, ease_function=Easing.LINEAR
                 )
             )
 
             # Go back
             chain.add(
-                TransitionAttr(attribute="center_x", end=start_x, duration=1, ease_function=linear)
+                TransitionAttr(
+                    attribute="center_x", end=start_x, duration=1, ease_function=Easing.LINEAR
+                )
             )
             chain.add(
-                TransitionAttr(attribute="center_y", end=start_y, duration=1, ease_function=linear)
+                TransitionAttr(
+                    attribute="center_y", end=start_y, duration=1, ease_function=Easing.LINEAR
+                )
             )
             chain.add(TransitionAttrSet(attribute="disabled", value=False, duration=0))
 
@@ -50,4 +66,5 @@ def on_draw(self):
 
 
 if __name__ == "__main__":
+    arcade.resources.load_kenney_fonts()
     DemoWindow().run()

arcade/gui/transition.py

@@ -3,7 +3,7 @@
 
 from pyglet.event import EventDispatcher
 
-from arcade.easing import linear
+from arcade.anim import Easing
 
 T = TypeVar("T", bound="TransitionBase")
 
@@ -100,7 +100,7 @@ def __init__(
         attribute,
         duration: float,
         start=None,
-        ease_function=linear,
+        ease_function=Easing.LINEAR,
         delay=0.0,
         mutation_function: Callable[[Any, str, float], None] = setattr,
     ):
@@ -140,7 +140,7 @@ def __init__(
         increment: float,
         attribute,
         duration: float,
-        ease_function=linear,
+        ease_function=Easing.LINEAR,
         delay=0.0,
         mutation_function: Callable[[Any, str, float], None] = setattr,
     ):