:ambulance: Update third-party lustre_animation package to new api.

1 files changed, 52 insertions, 0 deletions

diff --git a/compat/lustre_animation/README.md b/compat/lustre_animation/README.md
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+# Lustre Animation
+
+The basic usage is
+ * keep 1 `Animations` value
+ * add animations by some trigger
+ * call `animation.cmd()` on your value and let your lustre `update()` return it.
+   This will cause a dispatch on the next JS animation frame, unless all animations have finished (and auto-removed)
+ * update the animations with the new time.
+ * evaluate for each animation you are interested in.
+
+e.g. like this:
+```gleam
+import lustre/animation as a
+
+pub type Msg {
+    Trigger
+    Tick(Float)
+}
+
+pub fn update(model: Model, msg: Msg) {
+    let m = case msg of {
+        Trigger -> {
+            let new_anim = a.add(model.animations, "id", 1.0, 2.0, 0.250)
+            Model(1.0, animations: new_anim)
+        }
+        Tick(t) -> {
+            let new_anim = a.tick(model.animations, t)
+            let new_value = a.value(new_anim, "id", model.value)
+            Model(new_value, new_anim)
+        }
+    }
+    #(m, animation.cmd(m.animations, Tick))
+}
+```
+
+In the above `type Model`, `init` and `render` have been omitted.
+
+There are fully functional examples animations in the `test/` directory,
+which you can build by
+```bash
+gleam test
+npx vite
+````
+
+and then pointing your browser to the URL that vite indicates.
+
+## TODO
+* `every(Minute)`, etc
+* `after(seconds: 2.5)`
+* quadratic, cubic, etc interpolators
+* Compose animations
+  `from("anim", 1.0) |> after(0.250) |> cubic(3.0, 0.250) |> after(0.250) |> quadr(2.0, 0.250)`
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