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5 ~% A5 M! ~ e# x i这些天想了想怎么给LCD做丝滑的动画,稍微想了想,便有了下面这些代码。
' k6 P2 U1 {, s7 n ?* b- importPackage (java.lang);
8 y5 d4 F3 u$ u/ n - importPackage (java.awt);1 L7 W& @$ K: ]( A4 J/ t4 M
- 4 _; O/ X& `" x$ H$ w/ _1 l! J
- include(Resources.id("mtrsteamloco:library/code/face.js"));
' ]# G U5 D& m v# e& ] - 5 L6 b# _% f$ R1 Y7 ^2 {
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
- T G: u; [ N( N - 4 O. H- H1 ~3 _3 g/ y$ H
- function getW(str, font) {! U8 q% n: Q& \
- let frc = Resources.getFontRenderContext();
$ r0 i7 E* |4 [; C1 v* s - bounds = font.getStringBounds(str, frc);
4 u8 h" i: p# X. X) G - return Math.ceil(bounds.getWidth());4 |: o5 P4 ^7 A
- }! p! G F# o2 F0 Y1 ]) |, \/ L
- t1 H+ Y5 j5 a
- da = (g) => {//底图绘制
% v% D) f8 {" m8 l3 K4 n) H - g.setColor(Color.BLACK);' N, ?2 S- p& I
- g.fillRect(0, 0, 400, 400);. f0 U I( U0 a2 y8 a
- }
P1 d6 e3 f3 K/ R4 A7 ? \
0 f7 I$ _( C2 E- db = (g) => {//上层绘制( B0 Y, ?. L; C7 ~% v" c: `2 w3 _/ [
- g.setColor(Color.WHITE);
9 H: O2 @/ j3 h/ [1 H' _ - g.fillRect(0, 0, 400, 400);
+ o$ ^# H# [7 F: A9 W2 T7 z7 U' x - g.setColor(Color.RED);- z& s+ f# `! ~1 C+ H
- g.setFont(font0);
7 G3 w$ M8 o" b- A' v0 w - let str = "晴纱是男娘";4 E J t0 p" a8 m2 o6 x! i- U7 A
- let ww = 400;7 `8 x9 C% T, x' J4 y/ d
- let w = getW(str, font0);8 c5 Q9 }( v% P3 R% b
- g.drawString(str, ww / 2 - w / 2, 200);- ?4 {8 c( u5 s% |1 v0 ~4 T
- }# b" ]. X7 D$ W4 z0 P# @
N- m6 t: Z3 C- const mat = new Matrices();* C/ t+ e0 ?, O$ n* R3 A
- mat.translate(0, 0.5, 0);7 h, I& J8 j" O( E! D/ S
) g# K# g( \( \4 M+ d- a9 g3 ?- function create(ctx, state, entity) {9 y. r$ I% K B, h# R
- let info = {0 k/ i& t, E8 s% y1 O
- ctx: ctx,
1 E4 d/ ~" [0 p, Z3 P - isTrain: false,# V: v8 {+ Q$ C
- matrices: [mat],$ @8 P: x7 O1 I
- texture: [400, 400],4 y- y z* W7 L8 o) z; L
- model: {. [3 G! Y. X3 q6 Y: J& E; ~3 t0 z
- renderType: "light",! @. ?7 z! M& V) g8 S$ O
- size: [1, 1],0 P/ p3 g/ x: L+ Z }
- uvSize: [1, 1]
$ W: S/ V& G8 j, ~ - }6 K. ?& G, Y3 w4 Y2 W
- }
* Q( l) @) o* a- _, { - let f = new Face(info);; D$ c" {5 r3 J1 ]3 ]4 E8 ~) z7 ?
- state.f = f;6 p! s. C; v2 X
n# m) z8 E2 I$ @! ^% V9 J- let t = f.texture;, e/ I) z M! [( X. v) h+ `2 W
- let g = t.graphics;( j5 q3 l3 M5 l# e, L
- state.running = true;
7 j4 f9 @; a, o; \' K, _ - let fps = 24;
7 L# ^- }6 N1 _! `) p6 n - da(g);//绘制底图
* \/ q' Z5 a! i$ z6 q% u% r8 Y - t.upload();
3 i5 _* w9 e* u: i- S" W, e - let k = 0;
- g4 @# a% s' o2 k. N5 b6 O - let ti = Date.now();
1 z( d& o9 k a v* e - let rt = 0;
4 Y- k' P/ d0 z/ K& ~- p8 K6 V - smooth = (k, v) => {// 平滑变化
* u- Y6 p6 o0 u. Z6 h - if (v > k) return k;
9 j3 I' p3 }; p" s/ T$ M - if (k < 0) return 0;
3 M6 ?* H L: Z* ~; |$ o9 [ - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;0 ^# h) D' L9 Q; d4 {, r
- }6 e8 K# [0 M0 s( Y/ J; C
- run = () => {// 新线程' _% k5 z$ B: x* _: X9 l
- let id = Thread.currentThread().getId();
" }7 s* H/ a; _9 e( | - print("Thread start:" + id);5 \2 i$ q) m$ I/ A, D5 t+ T0 ?
- while (state.running) {5 d% L8 p9 ~: r- {
- try {: q9 U1 B" k5 B$ H
- k += (Date.now() - ti) / 1000 * 0.2;
; e. Y# ]' @! x! ^7 o/ } V - ti = Date.now();9 o7 I( S7 l) K+ Z/ W
- if (k > 1.5) {
B, {1 x$ b; \4 O - k = 0;
. D6 F" o- y) v3 e; v - }
4 c L0 P4 s) F- w* w0 F, y - setComp(g, 1);
% |3 I( e6 M6 b/ [% f9 S% V - da(g);
! J3 A- T* q7 k* i) `% i5 x( q - let kk = smooth(1, k);//平滑切换透明度" M6 T8 L2 `4 ^3 \- `
- setComp(g, kk);' S8 X( U+ U7 P5 x' r7 J
- db(g);3 _6 R4 }' t- A, v% P& x. `
- t.upload();- [* G1 r! {) m2 t8 P
- ctx.setDebugInfo("rt" ,Date.now() - ti);2 y4 E, L4 Y( T
- ctx.setDebugInfo("k", k);
0 {! g, f4 h7 B) b8 x2 @ - ctx.setDebugInfo("sm", kk);
8 h$ t# m4 G. x: ?- K1 Q, | - rt = Date.now() - ti;
1 E: J# D! s& i$ J# ^9 f$ w3 u - Thread.sleep(ck(rt - 1000 / fps));
1 G$ k; R8 ]5 U, a/ A2 } - ctx.setDebugInfo("error", 0)
' T e/ s0 i4 K, p8 z - } catch (e) {
# V2 m+ K7 b+ ?3 B5 B% \ - ctx.setDebugInfo("error", e);
, ?0 w, o! U. _6 A* x& b/ | - }
d0 k0 @! o/ w4 x! N - }
O6 \( J! {5 a4 L+ W9 a - print("Thread end:" + id);
( S9 n. f: T, h! w - }
5 |- z" B- z }- [' W, e( t - let th = new Thread(run, "qiehuan");
- `" Z l" o3 {4 F - th.start();
! ?* d# c; B4 g3 o - }
: k& o, }+ n; G; p
6 v8 G& _8 N% [# `, a" ?. z- function render(ctx, state, entity) {6 ` T& j+ u1 h! E Q
- state.f.tick();
6 ~ u G8 y3 n M: { - } T# D6 S* L, l
: D) P2 v# q6 B: q5 ?- function dispose(ctx, state, entity) {( W3 t$ U ]/ e4 g y
- print("Dispose");0 W: l' i/ L6 M
- state.running = false;
. Z( _3 e! U* s; R. N( c; E - state.f.close();
! V: `9 h" U9 ~ - }
: y& U+ W E, \7 u* f6 R - 3 o$ ~7 U3 o6 s& `7 _7 _% m, n |
- function setComp(g, value) {% x2 c1 m: S% x& Q0 S9 \. b
- g.setComposite(AlphaComposite.SrcOver.derive(value));$ `, k3 M% y7 Z8 D% ]
- }
复制代码
$ z6 S: e, A w% C5 z& x写了这么久的js,我便渐渐发觉使用 render 来写更新内容有局限性,比如说会拉高延迟.....等等(但可能也没什么影响?)。在这里我用新建 Thread (线程) 然后在新的 Thread 里来处理图片更新逻辑,实现丝滑切换。
! F; D% q( n6 z' ~3 q# t
) H( J5 Z9 L7 Z! x9 J O
" e1 v* L4 e Q/ P, f2 \: a0 n顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)" g( V5 f" e% r$ V8 p7 x
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