1 files changed, 81 insertions, 0 deletions
diff --git a/src/animation.rs b/src/animation.rs
new file mode 100644
index 0000000..24932b2
--- /dev/null
+++ b/src/animation.rs
@@ -0,0 +1,81 @@
+use ggez::graphics::Rect;
+use std::collections::HashMap;
+use std::f32::consts::PI;
+use std::time::Instant;
+
+use crate::entity::Action;
+use crate::tileset::Tileset;
+
+#[derive(Clone)]
+pub struct Animation {
+    pub animation: Vec<(usize, Rect)>,
+    pub animations: HashMap<Action, Vec<(usize, Rect)>>,
+    pub timer: Instant,
+    pub source: Rect,
+}
+
+impl Animation {
+    pub fn new(tileset: &Tileset) -> Animation {
+        let mut animations = HashMap::new();
+
+        let mut source = tileset.get_tile_by_entity_keyframe("player-top", 0);
+        source.h += tileset.get_tile_by_entity_keyframe("player-bottom", 0).h;
+        animations.insert(Action::IdleLeft, vec![(1, source)]);
+
+        let mut moving = tileset.get_tile_by_entity_keyframe("player-top", 1);
+        moving.h += tileset.get_tile_by_entity_keyframe("player-bottom", 1).h;
+
+        animations.insert(Action::MovingLeft, vec![(100, source), (100, moving)]);
+        animations.insert(Action::MovingUpLeft, vec![(100, source), (100, moving)]);
+        animations.insert(Action::MovingDownLeft, vec![(100, source), (100, moving)]);
+
+        source = flip(source);
+        moving = flip(moving);
+
+        animations.insert(Action::IdleRight, vec![(1, source)]);
+
+        animations.insert(Action::MovingRight, vec![(100, source), (100, moving)]);
+        animations.insert(Action::MovingUpRight, vec![(100, source), (100, moving)]);
+        animations.insert(Action::MovingDownRight, vec![(100, source), (100, moving)]);
+
+        Animation {
+            animations,
+            source,
+            timer: Instant::now(),
+            animation: Vec::new(),
+        }
+    }
+
+    pub fn update(&mut self, action: &Action) {
+        self.animation = self.animations.get(&action).cloned().unwrap_or_default();
+        let (source, timer) = next_source(self.source, &self.animation, self.timer);
+        self.source = source;
+        self.timer = timer;
+    }
+}
+
+pub fn next_source(source: Rect, animation: &[(usize, Rect)], timer: Instant) -> (Rect, Instant) {
+    if let Some(mut i) = animation.iter().position(|a| a.1 == source) {
+        if timer.elapsed().as_millis() > animation[i].0 as u128 {
+            i = if i == animation.len() - 1 { 0 } else { i + 1 };
+            (animation[i].1, Instant::now())
+        } else {
+            (source, timer)
+        }
+    } else if !animation.is_empty() {
+        (animation[0].1, timer)
+    } else {
+        (source, timer)
+    }
+}
+
+pub fn convert_angle_to_rad(angle: f32) -> f32 {
+    angle * (PI / 180.0)
+}
+
+pub fn flip(rect: Rect) -> Rect {
+    let mut r = rect;
+    r.x *= -1.0;
+    r.x -= rect.w;
+    r
+}