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% z$ N9 {8 J( `5 D- P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 |6 A0 Q) g: ]* G) ]" e+ x" c+ e- importPackage (java.lang);. F- c3 y" u4 `6 Z2 h
- importPackage (java.awt);$ L; P8 I" I4 K: ?
# B( r/ j) r: q- include(Resources.id("mtrsteamloco:library/code/face.js"));
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! ^5 R9 W! Q% f$ E* E/ h+ E3 L s- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
% ]1 d" f" \7 h - 5 e; I+ m3 v W
- function getW(str, font) {
4 i1 y* E& a# y. S - let frc = Resources.getFontRenderContext();
2 t( \2 u; g& ^( G3 | - bounds = font.getStringBounds(str, frc);
2 Q) z' E7 ~( _/ S$ i; J! F, J - return Math.ceil(bounds.getWidth());0 ]5 D1 B( F ^( m! g/ T
- }' Z$ V9 _! `% L9 w6 }
- L8 x8 r$ b( D- da = (g) => {//底图绘制
3 X% ^0 U) o ]+ [3 ?# X - g.setColor(Color.BLACK);
4 m. i$ j" f+ u" H, O - g.fillRect(0, 0, 400, 400);
: a6 T0 p3 @4 Q, I, ]$ h# r - }% L1 ^9 D; ?( l
* u# d1 P3 c7 G1 z" z, t+ T, _- db = (g) => {//上层绘制* U' H# y- U8 p5 v4 h$ ~1 }; [
- g.setColor(Color.WHITE);! n4 N5 z* s3 a, |: J* C: \# V
- g.fillRect(0, 0, 400, 400);
! `5 W4 {- l3 Q4 m, b - g.setColor(Color.RED);
9 s$ R$ ]- ?! N: q7 s - g.setFont(font0);
2 m+ T. A/ c& q$ z3 _& G s - let str = "晴纱是男娘";
5 j J4 b4 N/ d2 H( {% ~2 l* R6 s - let ww = 400;
0 b% S* q4 w# [) L- l& l( A9 \ - let w = getW(str, font0);
, i# V& s: U2 A! G% Q% d; X* c - g.drawString(str, ww / 2 - w / 2, 200);, g. P% Y. i5 ]- M6 n$ Q
- }
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; B5 K; f, X+ A# g. s- const mat = new Matrices();# a' \$ l" P+ D6 T Q
- mat.translate(0, 0.5, 0);0 _7 g* y* w" d; i/ U, B% {' \
- 4 I4 q B. B0 }2 N* m2 E& F1 C" p
- function create(ctx, state, entity) {8 m2 d) H* L' T- [( Q# u) P6 `
- let info = {. p# D6 u$ Z7 m+ ^
- ctx: ctx,; q0 \3 c8 {/ F2 r3 j0 t, V
- isTrain: false,* t# {- G# |9 S# z/ {
- matrices: [mat],8 R$ h8 q% a6 M( d( d8 @+ }
- texture: [400, 400],+ P; R4 s2 Y: j5 B
- model: {
0 C, C: R1 s, ]* h - renderType: "light",% {1 Q; s1 A6 Q) i
- size: [1, 1],
# l0 S" l+ y7 }. R, N( Q @& Q) H6 Y - uvSize: [1, 1]7 {6 O* j7 |% z5 p
- }
) h* d7 \" f* U! q - }
0 O- k4 v5 n) O# O - let f = new Face(info);& Z8 t' h0 D1 C
- state.f = f;
& T% C$ q: U+ _6 p& ~ - 3 H) a1 l- p, Q' U. F1 f
- let t = f.texture;9 I* G* L5 [* m7 z5 e! M/ P
- let g = t.graphics;
3 k* X; Y7 Y) M9 J; v( `$ R - state.running = true;) t/ K9 I$ G8 U- A5 w- A) ~- V
- let fps = 24;
# ?, ]& B* n( X" n& u0 j - da(g);//绘制底图
& B% a0 j! U) Z; e5 f7 v - t.upload();# C& Y7 t7 i' t
- let k = 0;' m$ a, \; o, i( k" y
- let ti = Date.now();
: D8 k! W6 ~! t" y" I - let rt = 0;
, R; |; x ^. v$ E/ d3 e+ p - smooth = (k, v) => {// 平滑变化8 f6 a& B& [! x# B7 S$ |' B; R
- if (v > k) return k;& A5 O# W) v; w2 W* w9 W
- if (k < 0) return 0;4 f( y1 L* N6 N) W$ M; H3 o3 {. R
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;; s5 @6 i- j3 l3 Q" j
- }, @: Z( B' c# D
- run = () => {// 新线程( M/ j/ N/ [1 ?# r, B
- let id = Thread.currentThread().getId();
" g6 J: g) G+ G0 U - print("Thread start:" + id);0 p. T9 `; j, O3 {, J. a& b. w
- while (state.running) {( Z& \- I6 ^. _- X( S/ O P& R' p
- try {
( ?, J8 H9 u& U4 s' L - k += (Date.now() - ti) / 1000 * 0.2;
8 N0 X- p2 @& i4 I - ti = Date.now();! m: c7 Z# y" ]) x j
- if (k > 1.5) {
5 K9 b3 H. E+ @" N# y - k = 0;% j& ~9 Y+ H" L: ~
- }
, P2 r8 K. s s - setComp(g, 1);; G" W o9 w: \( P f) `6 E
- da(g);; N' z0 W* _& `2 v" `' R* x9 J
- let kk = smooth(1, k);//平滑切换透明度
0 E. F' x' ^7 C0 J: f, j - setComp(g, kk);5 p/ t8 J5 A8 e& q# `$ `5 D
- db(g);" ]1 ~" @( ?' X; J
- t.upload();
- n1 ]* ?; i/ U* t - ctx.setDebugInfo("rt" ,Date.now() - ti);7 p. q' t: ^! o% q# a" v
- ctx.setDebugInfo("k", k);
$ J( X, q3 y1 | - ctx.setDebugInfo("sm", kk);% s3 i0 [7 Q' H4 ]
- rt = Date.now() - ti;/ n9 s) v9 \9 T& v% d; C
- Thread.sleep(ck(rt - 1000 / fps));
% {) U' F8 b$ ?$ j& K* C2 E - ctx.setDebugInfo("error", 0)
. \5 f8 A4 k, ^ - } catch (e) {. Q$ A1 D, l7 V3 W
- ctx.setDebugInfo("error", e);
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- }& o8 @( _" y8 ]+ b- K
- print("Thread end:" + id);
9 M( u, Y" d \7 T - }
* w' K$ H& A; R) H1 \" m X' r - let th = new Thread(run, "qiehuan");0 C* `' a' s0 [. H* d n
- th.start();1 O* B+ S/ y& g
- }5 W* a8 z% X) y: `+ u; M# L. X- R( Y
- F5 {% u l8 a( l& C: g- function render(ctx, state, entity) {
$ p+ o- {+ g' ^# n- i - state.f.tick();" _4 R7 r* x- n, w8 ]
- }- e+ O$ E( ^3 @8 N; t
3 P% y( C8 w0 W& p; n f- function dispose(ctx, state, entity) {: g/ \- P! [& W* W
- print("Dispose");
/ a& L. \, I& p* w1 D( j m - state.running = false;6 ~9 B# {3 |! e. H1 S
- state.f.close();
( i' E% a7 A0 g$ q0 R! ]# s - }* D/ X( m4 }' r$ ~
- 8 B; l! }1 V0 {. z1 X, |6 g
- function setComp(g, value) {
) q6 v, N. J9 N6 ?/ ? - g.setComposite(AlphaComposite.SrcOver.derive(value));7 ` b9 h5 `$ S: U; b+ F" x* w0 w" x# ~
- }
复制代码
c# S) U7 ]0 Z& n9 B0 D1 N# Y# y5 r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。
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顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)5 _2 G- p6 M4 @5 D! }, f; [1 X
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