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' o0 I2 S0 ]; o# }9 A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。8 G4 m. r7 X- d2 K; T( r
- importPackage (java.lang);
% Q& c1 ^" q/ W0 v2 H8 o - importPackage (java.awt);
7 R. V+ ~- R- t - m! l: O5 C# a E3 e& Y% {
- include(Resources.id("mtrsteamloco:library/code/face.js"));% j7 @7 J: A6 B1 o$ e, P) ?: J
- ! M: X& G% f4 T6 G: Q
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
9 h% [! A+ o. {. Y4 v - . C0 D2 T1 v7 R& p' v" j9 K& l; B# v
- function getW(str, font) {
, B: h* C) X* _' I& ~) ]5 Z+ ~ - let frc = Resources.getFontRenderContext();
3 M7 \2 c8 I/ K* C" A& [& p - bounds = font.getStringBounds(str, frc);
/ t1 c# K$ C" ~: f7 L - return Math.ceil(bounds.getWidth());3 O$ a! v0 \2 O y5 g( K1 g; N- p
- }, R* d/ q) j6 J$ Z
- 3 t) {* Y; I( p: w, P& n% M- D
- da = (g) => {//底图绘制
+ _1 v8 M( ^, X( Y! T, E3 k - g.setColor(Color.BLACK);* R- i2 a7 ^( F- C2 Z. W+ r( x" ~
- g.fillRect(0, 0, 400, 400);' N$ ]' a" ]' M& Q
- }
" I; c4 O2 Q H9 Z6 N4 p
. W9 h: P' H9 R9 o# }3 A6 u- db = (g) => {//上层绘制, ^! s9 I" p, p7 {' f1 ]
- g.setColor(Color.WHITE);7 r3 ?; Q$ w2 F6 M+ @! d
- g.fillRect(0, 0, 400, 400);. p0 ^6 E) ? I" e
- g.setColor(Color.RED);, ]' C6 F+ c$ D! V$ R# |/ X
- g.setFont(font0);' _3 f8 M7 h; o% C" ^ x
- let str = "晴纱是男娘";! h/ @6 ^' h" d1 Z
- let ww = 400;
9 G0 E F4 A1 _! G; z& h - let w = getW(str, font0);
/ C& h' c& w6 U1 O& D9 _& F - g.drawString(str, ww / 2 - w / 2, 200);
: z7 }, i, V2 B) |7 p - }2 b$ ]/ B% D) {: k7 y
- / A8 \# K5 P- A& j
- const mat = new Matrices();
5 Q8 O* v" b4 H8 |! Q0 _0 J - mat.translate(0, 0.5, 0);3 Q: w- i$ ?' v7 K6 B. R4 s4 v
- / y2 S5 o7 m- ^# q. [: s; D7 F2 ]
- function create(ctx, state, entity) {
7 w! H5 d! l+ K! D1 l) n - let info = {/ y7 j& h( i0 o: g( S. T
- ctx: ctx,& E7 y# f" _' M; Y( X+ W" i' Q
- isTrain: false,
9 N# L+ N1 x- B& F - matrices: [mat],
" H, I6 U" X$ b3 U9 \' Z - texture: [400, 400],
; `! D. t1 v/ L( V# r - model: {; r4 t! Q G2 w: e. I* V' h; t
- renderType: "light",- a3 t( L2 Z# d5 q/ N
- size: [1, 1],
: v- g0 D+ z! e0 Y - uvSize: [1, 1]; V* w2 C/ U, j# y: C9 B' J f$ z
- }5 {* s: a+ l/ X& ]" M7 ]
- }
P- P- a, Q9 J" ]# _; S# ? - let f = new Face(info);
; E5 H! S8 Q. G' b' N* M! \ D - state.f = f;
& J @3 `; ^, o( |
1 P F U. a$ k+ L' l( d- let t = f.texture;
6 s5 b# s' S, ]9 _7 E/ x - let g = t.graphics;
3 `9 d. |! Y# V* x5 g - state.running = true;' P/ E. ^( V+ X) e+ M/ p/ C
- let fps = 24;& R8 m8 @- e* ^! L7 N
- da(g);//绘制底图6 ~# N" w4 G R
- t.upload();
( m* x3 Z. v) b0 [, n1 g - let k = 0;
# t& F4 l7 I1 a k - let ti = Date.now();3 W7 y; f5 L: |# s
- let rt = 0;1 R& [* k- c3 H+ r& d* Z
- smooth = (k, v) => {// 平滑变化 c$ L! @' K: P+ Q- X+ Y" y' n
- if (v > k) return k;
6 |' b) ~) J# L' V - if (k < 0) return 0;8 t7 T; q s3 s W8 q7 n
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;3 B Y Z; P/ l# `1 J4 e
- }6 |3 E7 Z% M5 N0 [1 g
- run = () => {// 新线程
6 F$ K# T2 I. X, B# E' U, A5 I - let id = Thread.currentThread().getId();
; S- ~- P1 @0 M8 M; p. D. { - print("Thread start:" + id);" l2 |, n$ \# x, I' [# { D
- while (state.running) {
* ]9 r- ^8 ^. p7 Q( x/ t6 B+ j0 }, l - try {% B+ v# @- f, M. N$ {1 }7 u$ \9 O1 Y
- k += (Date.now() - ti) / 1000 * 0.2; f( N- G* p7 d" l2 u7 W
- ti = Date.now();1 q6 \! i# E' G9 \# b0 E' ]4 {. F
- if (k > 1.5) {
; _3 z5 R5 w3 I' G - k = 0;
7 }% `8 R( m3 I% u6 { d6 t7 N - }
3 ]' B& Z' t* A0 J' t3 q - setComp(g, 1);
) Q: J2 j- M; Z# j" u" w, t. ^ - da(g);# F. h5 z+ x" |2 z8 q
- let kk = smooth(1, k);//平滑切换透明度
l( B: T$ ^0 g3 T( o - setComp(g, kk);
: s5 L! E; V$ a; x4 | - db(g);5 ?/ O: T4 U4 p# F& ^1 y. r
- t.upload();
4 E+ R8 X, d1 l0 x - ctx.setDebugInfo("rt" ,Date.now() - ti);
+ c6 y& y3 R' v/ s. {. m - ctx.setDebugInfo("k", k);- [& F3 @- \4 t8 h' X$ m3 I
- ctx.setDebugInfo("sm", kk); F: A5 w2 _% A+ E5 ~1 Z0 R
- rt = Date.now() - ti;
# D' b4 [2 r+ W/ w6 t- F - Thread.sleep(ck(rt - 1000 / fps));
) ?& U7 h, B1 ^# g! Z1 G - ctx.setDebugInfo("error", 0)% z/ w$ K, C6 k% ~' e# y
- } catch (e) {& ~( G$ q$ X6 l1 w- P% m7 e5 j( d
- ctx.setDebugInfo("error", e);
9 Z% {' Z. T S2 x - }
?; ]8 G3 u* m# B( [" y0 @/ o$ N - } T% ]+ `' a; |! N) c c: e/ k
- print("Thread end:" + id);4 p* t; n' S6 q o
- }7 J* ^% l6 w( N4 U
- let th = new Thread(run, "qiehuan");
9 e+ C& x4 ?5 x6 f5 ^1 v" e - th.start();
# O/ k- x# N; S G( n7 l4 n7 K - }, J7 p! e/ a* T7 R
2 P! X i' P4 J3 w- function render(ctx, state, entity) {3 H# t7 _" {( s) _4 M
- state.f.tick();
8 F6 {8 g& [7 E - }
9 `0 g8 k2 |& f/ `- D0 X$ Z - 6 @+ X& C6 \( E
- function dispose(ctx, state, entity) {
4 p, a! X- ~, Y1 g6 d - print("Dispose");, p/ d# x5 a* R) O/ y) a
- state.running = false;9 _ j8 F) w8 }# {
- state.f.close();
8 i/ I+ m A& a% [) x - }
% x' N+ i2 ^9 U2 k% X
& K+ G# ^3 @; I- function setComp(g, value) {" r+ e, A+ Q; J. c9 a4 `
- g.setComposite(AlphaComposite.SrcOver.derive(value));* E) Q8 w; W7 q0 F- K
- }
复制代码 + l; l; y' ~4 O2 p |
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。
) ]. F6 Y/ u9 ~: R7 h& V/ x; F1 R M% ?6 O% u! B
* T* U4 p @5 Y3 ~顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)
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