From 34e58f52d1d3bfcfbf04f0c5e75e8efd42e79542 Mon Sep 17 00:00:00 2001
From: Michael Zhang <iptq@protonmail.com>
Date: Thu, 8 Aug 2019 22:53:12 -0500
Subject: [PATCH] begin work on animations

---
 src/animations.rs  | 22 ++++++++++++++++++++++
 src/game.rs        | 39 ++++++++++++++++++++++++++++++---------
 src/level/block.rs |  2 ++
 src/level/mod.rs   | 28 ++++++++++++++++++++++++++++
 src/main.rs        |  1 +
 5 files changed, 83 insertions(+), 9 deletions(-)
 create mode 100644 src/animations.rs

diff --git a/src/animations.rs b/src/animations.rs
new file mode 100644
index 0000000..8ad9090
--- /dev/null
+++ b/src/animations.rs
@@ -0,0 +1,22 @@
+use std::collections::HashMap;
+
+type BlockOffsets = HashMap<usize, (u32, u32)>;
+type AnimationFn = Box<Fn(BlockOffsets, f32) -> BlockOffsets>;
+
+#[derive(Default)]
+pub struct AnimationState {
+    pub is_animating: bool,
+    pub last_move_success: bool,
+    pub progress: f32,
+    pub block_offsets: BlockOffsets,
+
+    progress_function: Option<AnimationFn>,
+}
+
+impl AnimationState {
+    pub fn begin_transition(&mut self, f: AnimationFn) {
+        self.is_animating = true;
+        self.progress = 0.0;
+        self.progress_function = Some(f);
+    }
+}
diff --git a/src/game.rs b/src/game.rs
index 4548c1f..c161959 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -4,6 +4,7 @@ use std::time::Duration;
 use glium::glutin::{ElementState, Event, VirtualKeyCode, WindowEvent};
 use glium::{Display, Frame};
 
+use crate::animations::AnimationState;
 use crate::enums::PushDir;
 use crate::level::Level;
 use crate::renderer::Renderer;
@@ -18,12 +19,15 @@ const SEGMENT_IMAGE: &[u8] = include_bytes!("../textures/segment.png");
 
 const LEVEL_TUTORIAL: &str = include_str!("../levels/tutorial.json");
 
+const ANIMATION_SPEED: f32 = 6.0;
+
 pub struct Game<'a> {
     pub resources: Resources,
     pub display: &'a Display,
     levels: Vec<Level>,
     current_level: usize,
     keymap: HashMap<VirtualKeyCode, bool>,
+    animations: AnimationState,
 }
 
 impl<'a> Game<'a> {
@@ -46,6 +50,7 @@ impl<'a> Game<'a> {
             levels,
             current_level: 0,
             keymap: HashMap::new(),
+            animations: AnimationState::default(),
         }
     }
 
@@ -93,21 +98,37 @@ impl<'a> Game<'a> {
             ($key:expr, $player:expr, $movement:expr) => {
                 if self.is_pressed(&$key) {
                     let level = self.get_current_level_mut();
-                    level.handle_movement($player, $movement);
+                    let result = level.handle_movement($player, $movement);
                     self.keymap.insert($key, false);
                 }
             };
         }
 
-        shit!(VirtualKeyCode::W, true, PushDir::Up);
-        shit!(VirtualKeyCode::A, true, PushDir::Left);
-        shit!(VirtualKeyCode::S, true, PushDir::Down);
-        shit!(VirtualKeyCode::D, true, PushDir::Right);
+        if self.animations.is_animating {
+            let delta_ms = delta.as_millis();
+            if self.animations.last_move_success {
+            } else {
+            }
+        } else {
+            shit!(VirtualKeyCode::W, true, PushDir::Up);
+            shit!(VirtualKeyCode::A, true, PushDir::Left);
+            shit!(VirtualKeyCode::S, true, PushDir::Down);
+            shit!(VirtualKeyCode::D, true, PushDir::Right);
 
-        shit!(VirtualKeyCode::I, false, PushDir::Up);
-        shit!(VirtualKeyCode::J, false, PushDir::Left);
-        shit!(VirtualKeyCode::K, false, PushDir::Down);
-        shit!(VirtualKeyCode::L, false, PushDir::Right);
+            shit!(VirtualKeyCode::I, false, PushDir::Up);
+            shit!(VirtualKeyCode::J, false, PushDir::Left);
+            shit!(VirtualKeyCode::K, false, PushDir::Down);
+            shit!(VirtualKeyCode::L, false, PushDir::Right);
+
+            // failed a move
+            if !self.animations.last_move_success {
+                self.animations
+                    .begin_transition(Box::new(|mut offsets, prog| {
+                        offsets.insert(0, (0, 0));
+                        offsets
+                    }));
+            }
+        }
     }
 
     pub fn render(&self, renderer: &mut Renderer) {
diff --git a/src/level/block.rs b/src/level/block.rs
index 0af1968..eaed205 100644
--- a/src/level/block.rs
+++ b/src/level/block.rs
@@ -13,6 +13,7 @@ pub trait Blockish {
 
 #[derive(Clone)]
 pub struct Block {
+    index: usize,
     movable: bool,
     position: (i32, i32),
     color: Color,
@@ -39,6 +40,7 @@ impl Block {
         let orientation = data.orientation.into();
         let color = Color::from_rgb_u32(data.color.0, data.color.1, data.color.2);
         Block {
+            index,
             movable,
             position,
             color,
diff --git a/src/level/mod.rs b/src/level/mod.rs
index 530804f..65e9591 100644
--- a/src/level/mod.rs
+++ b/src/level/mod.rs
@@ -114,6 +114,34 @@ impl Level {
 
     pub fn try_move(&self) {}
 
+    fn block_can_move(&self, block: impl Blockish) {
+        for segment in block.get_segments() {}
+    }
+
+    fn segment_can_move(&self, block: Block, segment: Segment, direction: PushDir) -> Option<()> {
+        let triple = (segment.position.0, segment.position.1, segment.board);
+        let target = triple + direction;
+
+        // is the target in the map?
+        if target.0 < 0
+            || target.0 >= self.dimensions.0 as i32
+            || target.1 < 0
+            || target.1 >= self.dimensions.1 as i32
+        {
+            return None;
+        }
+
+        // check if we're sharing a triangle cell
+        if let CellContents::Double((ind1, block1), (ind2, block2)) = self.cell_map.get(triple) {
+            // figure out which one is the other block
+
+            // check that we're pushing in the direction of the other block
+
+        }
+
+        Some(())
+    }
+
     // TODO: don't use a boolean here
     pub fn can_move(&self, player1: bool, direction: PushDir) -> Option<()> {
         // an absolute segment (as opposed to relative to a block)
diff --git a/src/main.rs b/src/main.rs
index ff62b29..5d3dcaf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ extern crate nalgebra_glm as glm;
 #[macro_use]
 extern crate serde_derive;
 
+mod animations;
 mod color;
 mod data;
 mod enums;