add app

app/src-tauri/src/animation/primitives/utils.rs

@@ -0,0 +1,29 @@
+use super::{
+    entities::AnimationData,
+    keyframe::{Keyframe, RenderedKeyframe},
+};
+
+pub fn timestamp_to_frame(timestamp: f32, fps: i16) -> i32 {
+    return (timestamp * fps as f32).round() as i32;
+}
+
+pub fn render_keyframe(
+    keyframe: Keyframe,
+    animation_data: &AnimationData,
+    index: usize,
+    curr_frame: i32,
+    fps: i16,
+) -> RenderedKeyframe {
+    let animation_start_frame = timestamp_to_frame(animation_data.offset, fps);
+    let frame_offset = timestamp_to_frame(keyframe.offset, fps);
+    let absolute_frame = animation_start_frame + frame_offset;
+    let distance_from_curr = absolute_frame - curr_frame;
+
+    RenderedKeyframe {
+        absolute_frame,
+        keyframe,
+        index,
+        distance_from_curr,
+        abs_distance_from_curr: distance_from_curr.abs(),
+    }
+}