Switch to using specs ECS for the stuff

Cargo.lock

@@ -64,6 +64,11 @@ dependencies = [
  "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "atom"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "atty"
 version = "0.2.11"
@@ -291,6 +296,109 @@ dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crossbeam"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-channel 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "deflate"
 version = "0.7.19"
@@ -361,6 +469,14 @@ name = "fuchsia-cprng"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fxhash"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.8.3"
@@ -486,6 +602,15 @@ name = "glob"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "hibitset"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atom 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hound"
 version = "3.4.0"
@@ -529,6 +654,8 @@ version = "0.1.0"
 dependencies = [
  "ggez 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "specs 0.14.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "specs-derive 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiled 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -593,6 +720,15 @@ name = "linked-hash-map"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lock_api"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log"
 version = "0.3.9"
@@ -670,6 +806,11 @@ name = "memchr"
 version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "memoffset"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "miniz-sys"
 version = "0.1.11"
@@ -698,6 +839,11 @@ dependencies = [
  "miniz_oxide 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mopa"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "msdos_time"
 version = "0.1.6"
@@ -735,6 +881,11 @@ dependencies = [
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "nonzero_signed"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "num"
 version = "0.1.42"
@@ -802,6 +953,14 @@ name = "num-traits"
 version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "num_cpus"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ogg"
 version = "0.4.1"
@@ -828,6 +987,63 @@ dependencies = [
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "owning_ref"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "owning_ref"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "peeking_take_while"
 version = "0.1.2"
@@ -912,6 +1128,18 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.6.5"
@@ -1013,6 +1241,27 @@ name = "rawpointer"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rayon"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rdrand"
 version = "0.4.0"
@@ -1072,6 +1321,14 @@ name = "rustc-demangle"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rusttype"
 version = "0.5.2"
@@ -1085,6 +1342,11 @@ dependencies = [
  "stb_truetype 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "scopeguard"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "sdl2"
 version = "0.31.0"
@@ -1106,6 +1368,19 @@ dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "serde"
 version = "1.0.89"
@@ -1130,6 +1405,37 @@ dependencies = [
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "shred"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mopa 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "shred-derive"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "shrev"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sid"
 version = "0.5.2"
@@ -1152,6 +1458,40 @@ dependencies = [
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "specs"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "derivative 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hibitset 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mopa 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nonzero_signed 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shred 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shred-derive 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shrev 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tuple_utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "specs-derive"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "stable_deref_trait"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "stb_truetype"
 version = "0.2.6"
@@ -1252,6 +1592,11 @@ dependencies = [
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tuple_utils"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "twox-hash"
 version = "1.1.2"
@@ -1399,6 +1744,7 @@ dependencies = [
 "checksum app_dirs2 2.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0aa02944d8a100b79057d1619032b1ad39de5eed6567cdeccbd53908b326e082"
 "checksum approx 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08abcc3b4e9339e33a3d0a5ed15d84a687350c05689d825e0f6655eef9e76a94"
 "checksum arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "92c7fb76bc8826a8b33b4ee5bb07a247a81e76764ab4d55e8f73e3a4d8808c71"
+"checksum atom 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3c86699c3f02778ec07158376991c8f783dd1f2f95c579ffaf0738dc984b2fe2"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
 "checksum autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a6d640bee2da49f60a4068a7fae53acde8982514ab7bae8b8cea9e88cbcfd799"
 "checksum backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "cd5a90e2b463010cd0e0ce9a11d4a9d5d58d9f41d4a6ba3dcaf9e68b466e88b4"
@@ -1426,6 +1772,16 @@ dependencies = [
 "checksum cpal 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d58ae1ed6536b1b233f5e3aeb6997a046ddb4d05e3f61701b58a92eb254a829e"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
 "checksum crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ba125de2af0df55319f41944744ad91c71113bf74a4646efff39afe1f6842db1"
+"checksum crossbeam 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d7408247b1b87f480890f28b670c5f8d9a8a4274833433fe74dc0dfd46d33650"
+"checksum crossbeam-channel 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "7b85741761b7f160bc5e7e0c14986ef685b7f8bf9b7ad081c60c604bb4649827"
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+"checksum tuple_utils 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cbfecd7bb8f0a3e96b3b31c46af2677a55a588767c0091f484601424fcb20e7e"
 "checksum twox-hash 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "555cd4909480122bbbf21e34faac4cb08a171f324775670447ed116726c474af"
 "checksum typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "612d636f949607bdf9b123b4a6f6d966dedf3ff669f7f045890d3a4a73948169"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"

Cargo.toml

@@ -8,3 +8,5 @@ edition = "2018"
 ggez = "0.4.4"
 tiled = "0.8"
 itertools = "0.8"
+specs = "0.14"
+specs-derive = "0.4"

src/main.rs

@@ -1,10 +1,12 @@
-#[macro_use] extern crate itertools;
+#[macro_use] extern crate specs_derive;
 
 use ggez::{Context, ContextBuilder, GameResult};
 use ggez::event::{self, EventHandler};
 use ggez::graphics;
 
 use std::path::Path;
+use specs::{Component, RunNow, System, NullStorage, VecStorage};
+use specs::world::Builder;
 
 #[allow(dead_code)]
 mod consts {
@@ -19,91 +21,129 @@ mod consts {
         tiled::PropertyValue::BoolValue(true);
 }
 
-#[derive(Debug)]
-struct Board {
-    tiles: Vec<Option<Tile>>,
-    entities: Vec<Option<Tile>>,
-    decoration: Vec<Option<Tile>>,
+#[derive(Component, Debug)]
+#[storage(VecStorage)]
+struct Position {
+    x: f32,
+    y: f32,
 }
 
-impl Board {
-    fn from_file(path: &Path) -> Board {
-        let tiled::Map {
-            tilesets,
-            layers,
-            ..
-        } = tiled::parse_file(path).unwrap();
-        let read_layer = |idx: usize| {
-            layers[idx].tiles.iter()
-                .flat_map(|row| row)
-                .map(|&n| if n > 0 {
-                    Some(Tile::from_tileset(n, &tilesets[0]))
-                } else {
-                    None
-                })
-                .collect()
-        };
-        let tiles = read_layer(0);
-        let entities = read_layer(1);
-        let decoration = read_layer(2);
-        Board {
-            tiles,
-            entities,
-            decoration,
-        }
-    }
-
-    fn draw() {
-        
+impl Position {
+    fn to_point(&self) -> ggez::nalgebra::Point2<f32> {
+        ggez::nalgebra::Point2::new(self.x, self.y)
     }
 }
 
-#[derive(Debug, Clone)]
-struct Tile {
-    action: Action,
-    sprite: (u8, u8),
-    pass: bool,
+#[derive(Component, Debug)]
+#[storage(VecStorage)]
+struct Sprite {
+    u: u8,
+    v: u8,
 }
 
-impl Tile {
-    fn from_tileset(n: u32, tileset: &tiled::Tileset) -> Tile {
-        let x = (n - 1) % 32;
-        let y = (n - x - 1) / 32;
-        let pass = tileset.tiles[n as usize].properties.get("pass").eq(
-            &Some(&consts::TILED_TRUE));
-        Tile {
-            action: Action::NoAction,
-            sprite: (x as u8, y as u8),
-            pass: pass,
+impl Sprite {
+    fn to_rect(&self) -> graphics::Rect {
+        graphics::Rect {
+            x: (1.0 / 32.0) * self.u as f32,
+            y: (1.0 / 32.0) * self.v as f32,
+            w: 1.0 / 32.0,
+            h: 1.0 / 32.0,
         }
     }
+}
 
-    fn draw(&self, (y, x): (usize, usize)) -> graphics::DrawParam {
-        let (tx, ty) = self.sprite;
-        graphics::DrawParam {
-            src: graphics::Rect {
-                x: (1.0 / 32.0) * tx as f32,
-                y: (1.0 / 32.0) * ty as f32,
-                w: 1.0 / 32.0,
-                h: 1.0 / 32.0,
-            },
-            dest: ggez::nalgebra::Point2::new(
-                x as f32 * 24.0, y as f32 * 24.0),
-            ..Default::default()
-        }
-    }
+#[derive(Debug, Copy, Clone)]
+enum DrawLayer {
+    Background,
+    Foreground,
+    Decoration,
 }
 
-#[derive(Debug, Clone)]
-enum Action {
-    NoAction,
+static DRAW_LAYERS: [DrawLayer;3] = [
+    DrawLayer::Background,
+    DrawLayer::Foreground,
+    DrawLayer::Decoration,
+];
+
+#[derive(Component, Default, Debug)]
+#[storage(NullStorage)]
+struct Background;
+
+#[derive(Component, Default, Debug)]
+#[storage(NullStorage)]
+struct Foreground;
+
+#[derive(Component, Default, Debug)]
+#[storage(NullStorage)]
+struct Decoration;
+
+fn world_from_file(w: &mut specs::World, path: &Path) {
+    let tiled::Map {
+        layers,
+        ..
+    } = tiled::parse_file(path).unwrap();
+
+    for (phase, layer) in DRAW_LAYERS.iter().zip(layers) {
+        for (row, y) in layer.tiles.iter().zip(0..) {
+            for (&n, x) in row.iter().zip(0..) {
+                if n != 0 {
+                    let x = x as f32 * 24.0;
+                    let y = y as f32 * 24.0;
+                    let u = ((n - 1) % 32) as u8;
+                    let v = ((n - u as u32 - 1) / 32) as u8;
+                    let mut e = w.create_entity()
+                        .with(Position { x, y })
+                        .with(Sprite { u, v });
+                    e = match phase {
+                        DrawLayer::Background => e.with(Background),
+                        DrawLayer::Foreground => e.with(Foreground),
+                        DrawLayer::Decoration => e.with(Decoration),
+                    };
+                    e.build();
+            }
+        }
+    }
+    }
 }
 
 struct MyGame {
-    board: Board,
+    world: specs::World,
     sprites: graphics::spritebatch::SpriteBatch,
 }
 
+struct Draw<'t, Phase> {
+    ctx: &'t mut Context,
+    sprites: &'t mut graphics::spritebatch::SpriteBatch,
+    _phase: Phase,
+}
+
+impl<'a, 't, Phase: Component> System<'a> for Draw<'t, Phase> {
+    type SystemData = (
+        specs::ReadStorage<'a, Position>,
+        specs::ReadStorage<'a, Sprite>,
+        specs::ReadStorage<'a, Phase>,
+    );
+
+    fn run(&mut self, (positions, sprites, phase): Self::SystemData) {
+        use specs::Join;
+
+        for (pos, spr, _) in (&positions, &sprites, &phase).join() {
+            let param = graphics::DrawParam {
+                src: spr.to_rect(),
+                dest: pos.to_point(),
+                ..Default::default()
+            };
+            self.sprites.add(param);
+            graphics::draw(
+                self.ctx,
+                self.sprites,
+                ggez::nalgebra::Point2::new(0.0, 0.0),
+                0.0).unwrap();
+            self.sprites.clear();
+        }
+    }
+}
+
 impl EventHandler for MyGame {
     fn update(&mut self, _ctx: &mut Context) -> GameResult<()> {
         Ok(())
@@ -114,15 +154,11 @@ impl EventHandler for MyGame {
         use ggez::nalgebra as n;
         g::set_background_color(ctx, g::BLACK);
         g::clear(ctx);
-        for layer in [ &self.board.tiles, &self.board.entities, &self.board.decoration ].iter() {
-            for (pt, t) in iproduct!((0..consts::BOARD_HEIGHT),
-                                     (0..consts::BOARD_WIDTH)).zip(
-                layer.iter()) {
-                if let Some(t) = t {
-                    self.sprites.add(t.draw(pt));
-                }
-            }
-        }
+
+        Draw { ctx, sprites: &mut self.sprites, _phase: Background }.run_now(&self.world.res);
+        Draw { ctx, sprites: &mut self.sprites, _phase: Foreground }.run_now(&self.world.res);
+        Draw { ctx, sprites: &mut self.sprites, _phase: Decoration }.run_now(&self.world.res);
+
         g::draw(ctx, &self.sprites, n::Point2::new(0.0, 0.0), 0.0)?;
         self.sprites.clear();
         g::present(ctx);
@@ -131,8 +167,16 @@ impl EventHandler for MyGame {
 }
 
 fn main() -> Result<(), ggez::error::GameError> {
+    let mut world = specs::World::new();
+    world.register::<Position>();
+    world.register::<Sprite>();
+    world.register::<Background>();
+    world.register::<Foreground>();
+    world.register::<Decoration>();
+
+    world_from_file(&mut world, &Path::new("assets/main.tmx"));
+
     // Make a Context and an EventLoop.
-    let board = Board::from_file(&Path::new("assets/main.tmx"));
     let mut ctx = ContextBuilder::new("game", "me")
         .add_resource_path({
             let base = std::env::var("CARGO_MANIFEST_DIR").unwrap();
@@ -145,7 +189,7 @@ fn main() -> Result<(), ggez::error::GameError> {
     let sprites = graphics::spritebatch::SpriteBatch::new(image);
 
     let mut my_game = MyGame {
-        board,
+        world,
         sprites,
     };