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0 W6 `( b X7 U- ^( J+ v4 M: ^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。
* `$ l- c+ L; f, e) ~8 E |- importPackage (java.lang);
( o4 i, M: Q# G3 J$ v; `' P - importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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- function getW(str, font) {
4 B( C b5 v( H4 n5 n - let frc = Resources.getFontRenderContext();' ]* i- p# `0 {& K3 B/ s; Q8 n
- bounds = font.getStringBounds(str, frc);7 f! c6 S% s: ?9 ~) C8 g
- return Math.ceil(bounds.getWidth());$ j! K8 r# d- B
- }
% _$ q% [+ {% ^# L: E - - |1 W; X7 K, V! M2 k7 _0 |& o2 T% k
- da = (g) => {//底图绘制6 Q+ h0 X. o o: @$ e
- g.setColor(Color.BLACK);
2 S0 o6 l+ s [* l8 X2 D# I w: k - g.fillRect(0, 0, 400, 400);$ \# ^: V. |! w! ~# X
- } [$ D& [: I! O1 ~& @/ y
- ) } B/ G4 A1 R7 c7 g4 U6 b3 h
- db = (g) => {//上层绘制
7 T1 s w! Q. C3 Z. w% c+ R - g.setColor(Color.WHITE);% {* q$ P1 M: m% k( B
- g.fillRect(0, 0, 400, 400);) U7 C% E7 {' |; i
- g.setColor(Color.RED);1 Q% X; Z$ v2 c/ b
- g.setFont(font0);
J, Z8 |; B# h - let str = "晴纱是男娘";* W! d) E9 O/ l, p1 _& i- t* \2 S
- let ww = 400;
2 E1 g, n, A. |) c6 s5 N ` - let w = getW(str, font0);, A4 i6 Q8 b) G
- g.drawString(str, ww / 2 - w / 2, 200); a( \( j% n/ {
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- . C7 H$ n8 g# e2 X, V! k. P( x
- const mat = new Matrices();
! c. z: o8 F: u2 M5 ? - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {
3 y1 l0 W$ J Q+ u - let info = {
$ a! h; Z/ g- ]( Y: V/ z - ctx: ctx," `$ h6 |7 |8 p$ [ F0 Y3 i/ H
- isTrain: false,
, G' Q- a; ^$ r$ B9 t. ` - matrices: [mat],- \" ], B- O z% V- n7 F3 k- S
- texture: [400, 400],! R- R, q' P% i0 w" v. a2 W
- model: {/ f& M, R v) \. ^8 m
- renderType: "light",- y. P+ E# i" Q( |7 s+ F
- size: [1, 1],. w% D4 W' H8 e# Q& _7 g. t
- uvSize: [1, 1]
3 ~& O( v- ~4 m" k/ p- C9 w" y - }
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- let f = new Face(info);# v A6 R& \6 U
- state.f = f;
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. r$ \3 d& N5 \- let t = f.texture;
7 o+ k- s+ N2 s( _) U - let g = t.graphics;
- h5 p5 s; A ?9 d3 y) V - state.running = true;8 G1 r B9 ^ D4 g* G
- let fps = 24;9 ]2 _" x6 b! o3 E
- da(g);//绘制底图
V/ J% s% y9 {2 F8 J - t.upload();, a {6 u, }/ W: a, m* {
- let k = 0;
: x/ y/ B/ X1 j5 w# y8 N4 ? - let ti = Date.now();
, C' P" L8 r$ v4 t: g2 Y- C' q - let rt = 0;
5 A% ~5 o- d6 b* X" Z5 J( A+ a - smooth = (k, v) => {// 平滑变化* J! \9 } ^8 J( \
- if (v > k) return k;" Y8 y3 V/ _7 s; F) k5 O
- if (k < 0) return 0;
6 g! h2 H7 T9 Z& H) c7 D/ t - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;* q l8 F" S6 l4 Z" E
- }; o' f+ w2 \1 x5 ~& q# ^( x
- run = () => {// 新线程- F: J. X9 g: S1 f3 B, c
- let id = Thread.currentThread().getId();6 ?( W; x6 a; ]" M c" J. A' d
- print("Thread start:" + id);
& H' j4 n% k- D/ h& c; H6 M# ? - while (state.running) {3 t4 ^0 ^% P3 ?9 s1 y
- try {
7 j( I' N* W0 ] - k += (Date.now() - ti) / 1000 * 0.2;
) `" n: M; E; {& { - ti = Date.now();
) f, t( O2 t% P8 Q# Z* O1 D2 p+ P - if (k > 1.5) {3 m) ?, d/ v0 ?/ g
- k = 0;
3 E* M( N: O4 W - }9 ~7 x. v" [( W0 U& X0 O
- setComp(g, 1);
& k0 ^% `% R* _$ [+ i# V% r - da(g);
7 E9 j" [$ f/ X0 P4 Z" U; Z# j - let kk = smooth(1, k);//平滑切换透明度
* i8 ~& H+ N% [$ m4 s - setComp(g, kk);
, B- d2 D0 K* J7 G& g - db(g);2 }4 @' n, @9 D5 {
- t.upload();) `3 n' }% V: Z# {: a
- ctx.setDebugInfo("rt" ,Date.now() - ti);8 v% e+ I" f# z9 B
- ctx.setDebugInfo("k", k);6 c/ G" E( K0 B; d* ]# g* y
- ctx.setDebugInfo("sm", kk);, l2 Q/ h0 c. d+ Z$ W' Q: a
- rt = Date.now() - ti;
& H. y; {: Y/ k - Thread.sleep(ck(rt - 1000 / fps));
/ I2 Z! w: _/ n4 F7 a - ctx.setDebugInfo("error", 0)5 s) l8 f( G$ r
- } catch (e) {
0 S+ s; c1 k0 I7 t+ W! `2 P - ctx.setDebugInfo("error", e);
0 V; x2 P1 p' u" p8 w - }! i3 ]/ o" ?% w1 V( x1 u& a9 k0 q
- }
* q# x8 D5 [( w9 b - print("Thread end:" + id);: B* F2 H2 o: ? l6 v
- }/ I' |. E9 k5 p; d$ ? k+ s! U5 y
- let th = new Thread(run, "qiehuan");8 I! u% Y6 S1 k
- th.start();
2 I0 l; t* u* _0 G- d; e" N - }) `, u1 y- _+ C6 X; ~1 o
- 8 z/ n2 _3 u' t* M
- function render(ctx, state, entity) {
/ ]3 f+ q3 L! E2 p" z! h5 x- | - state.f.tick();/ h: ~* b! A3 y7 C# d5 s$ W' j
- }! f, N9 A0 n9 M
- 6 j/ r( q8 d- b {: m$ q
- function dispose(ctx, state, entity) {
3 A, M$ W* d# } - print("Dispose");
! P' l* }* A7 S( n- \ - state.running = false;
( D! ?, ^1 ]! O - state.f.close();# N7 e* t( y) B# D
- }
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& W6 ?! I4 _3 t0 c- function setComp(g, value) {
) j7 y2 Y- a4 J# o" _+ K - g.setComposite(AlphaComposite.SrcOver.derive(value));$ D* r$ ]; |' ~+ m. L5 f+ h
- }
复制代码 3 M; Z# y, D: [" h0 Z& r/ o5 o/ V
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)0 z+ M. m+ {) M3 z0 S+ O
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