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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。; t/ N3 q- R! r: Q7 F+ S% O
- importPackage (java.lang);
$ H$ }. J% W1 d5 L - importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));: X& l8 `1 b& b, q) e* x- O& o
) d5 P+ j$ s8 Z4 h1 x' j% e, z i! }- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80); R2 U9 a2 a3 R& z+ {. ^( X
' `" l! G* }4 }+ e/ G) S1 f; a& ~- function getW(str, font) {2 b1 U8 x0 `, f: _( l
- let frc = Resources.getFontRenderContext();. P- u& D; z1 j$ E7 }
- bounds = font.getStringBounds(str, frc);1 s r; o7 \0 \9 q. B+ m5 r7 u" n
- return Math.ceil(bounds.getWidth());
& b2 J5 V& S9 ? - }
& Y$ z& m5 J/ }4 T! h4 I& P - " r: m" U" r8 X1 ]
- da = (g) => {//底图绘制2 Z$ n. m! l( R9 u) E* k. }* w
- g.setColor(Color.BLACK);
4 l, p1 P* }% _. @6 G, A - g.fillRect(0, 0, 400, 400);( O4 x# u* y$ l$ N
- }3 e7 B2 V4 w# c, E* \8 {( @7 Q; {0 E, X
; P4 p& x v" J( Z- g6 |" q- db = (g) => {//上层绘制: y; c; [! G. o# D% h
- g.setColor(Color.WHITE);
$ K- t( d% G+ P. I' Z, W3 @ - g.fillRect(0, 0, 400, 400);
3 ^6 Q3 A3 N' Y# k4 ], Q - g.setColor(Color.RED);
% E9 X- R( Z ]! f# z, A3 u9 d- x - g.setFont(font0);
0 i/ W% N9 A$ I% n; o5 ?" H - let str = "晴纱是男娘";0 X: r. `2 n1 h/ B1 p0 c& g/ M
- let ww = 400;3 l) i( U: D. M# b- a5 {3 F0 ?0 I
- let w = getW(str, font0);
) m- y, v/ e# D( K7 A - g.drawString(str, ww / 2 - w / 2, 200);
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- " f6 `7 m) G& k. d
- const mat = new Matrices();6 n6 ~9 H* K: i) t
- mat.translate(0, 0.5, 0);' t, m/ H. x- J1 {7 q4 v, `
- ; Y8 i/ ^$ f: V1 Y T! [! b- {6 y
- function create(ctx, state, entity) {0 B, ~; H* T& r
- let info = {
6 o7 a. V o3 J - ctx: ctx,. d t' [% S$ o) f5 O
- isTrain: false,
% M- [" y8 ~: ]& p. T% y: l - matrices: [mat],
8 P. I& ^. T# C) A$ z - texture: [400, 400],
& }0 m. ~$ z7 W- h; n+ S - model: {
+ ?5 o5 e7 L6 \' t0 u! S - renderType: "light",
! ^- A( | O$ d) U/ Z' C - size: [1, 1],
; f$ W3 c+ t) w6 L0 R - uvSize: [1, 1]* g2 I* S4 w' |8 ~8 W2 V. @) }
- }
+ {/ ?7 @" J, m# h - }, V+ u% [4 x- ~3 X4 R- D& b: b% ]
- let f = new Face(info);3 d+ v6 j h( M h+ B
- state.f = f;
6 f2 }8 `2 C: V/ k+ Y9 y
8 p2 ?; M" e, C+ J% N3 V- let t = f.texture;
- _3 U! W$ x+ o H9 O- F( B U. r - let g = t.graphics;
" X' ^; A) `# X+ f2 w - state.running = true;# j; f4 c$ G; T6 }1 T
- let fps = 24;
9 b; J0 [% r; L3 |$ M - da(g);//绘制底图
) ?( L( I3 a ^* N7 M% v9 G - t.upload();8 v) \9 Q, K) p$ w. m3 v
- let k = 0;9 r, b3 [' H2 o* `6 {! j+ D# L
- let ti = Date.now();
# V, H9 t/ a" p: n9 [ - let rt = 0;
9 ~ h! v6 S7 ^% Q - smooth = (k, v) => {// 平滑变化
! c+ n) S. \ _4 }; t - if (v > k) return k; B& e! \: `6 n& o
- if (k < 0) return 0;
8 K: \* w) ~5 K2 V! Z/ i- j% Z - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
* d6 Y) [. \9 _ q- } [ }( g - }
% V6 k- D4 X5 T3 C7 q1 B' ^& s - run = () => {// 新线程* _. d; v' }6 z" e0 f% H8 \
- let id = Thread.currentThread().getId(); ` x8 P& Z2 F( N% Z+ O
- print("Thread start:" + id);
2 G" x; b7 `& h! Q6 D$ \. } - while (state.running) {
1 r+ f b s6 k - try {
: Z Y% t7 K5 I6 T% x - k += (Date.now() - ti) / 1000 * 0.2;
% h8 \% h& |! M! i) W! z - ti = Date.now();
; ^9 F% y \! D0 O; S - if (k > 1.5) {# I! ]# ^$ L K
- k = 0;+ {, C2 |, D& t( A) Q1 b
- }
+ w# h1 X9 D2 o- X% ^ - setComp(g, 1);' |: M) e: J4 f& i
- da(g);
$ P% a9 g1 Z/ r - let kk = smooth(1, k);//平滑切换透明度
2 {4 }7 S6 ?' J: h2 @ - setComp(g, kk);
# f/ g. }* e+ @" X1 \" | - db(g);$ P9 j' d8 _( |& C: l+ |) D ]9 O
- t.upload();
# I* P* O* @$ I; M6 k8 F - ctx.setDebugInfo("rt" ,Date.now() - ti);) D: c( x5 {8 G4 X
- ctx.setDebugInfo("k", k);
+ U9 u D g, a% x' x" l; C, _ - ctx.setDebugInfo("sm", kk);
( R3 M2 U2 _& a - rt = Date.now() - ti;
7 x% c. D* |* U7 |3 p* ^- W8 ~; ^: y( [ - Thread.sleep(ck(rt - 1000 / fps));
. H/ e/ O4 }& f0 E - ctx.setDebugInfo("error", 0)) [% P9 c6 C# R7 L
- } catch (e) {
p( x$ e) w- l9 j - ctx.setDebugInfo("error", e);
& b# r4 _5 @; W! O - }
0 ~& d7 u1 a$ M6 \6 }& T - }
; |/ z* R+ F' ?" d0 T - print("Thread end:" + id);
6 C% _3 b7 q5 z& A - }
" J( u2 {+ X& C8 {$ ~( q( w - let th = new Thread(run, "qiehuan");8 C6 i+ i6 g8 C z
- th.start();7 N1 `4 l$ }0 Y6 N8 r) Q; @) G/ b
- }' R& k4 }4 V. @( ?$ i
- 1 l$ u5 L% Z$ G( x, X0 i
- function render(ctx, state, entity) {. r' {" Q7 S( h+ a$ w. C
- state.f.tick();
- F) B9 Y- _ I/ @ - }. A1 @+ } {! @/ _
- 5 c! b6 M( \5 q
- function dispose(ctx, state, entity) {& f0 ?2 T. z& m/ p& x8 H0 B5 S
- print("Dispose");
" R' i2 E3 N7 ]+ v3 B - state.running = false;9 c3 `9 w; I( ^ e0 t# j$ \
- state.f.close();# D( r4 t/ C- E9 P
- }
C5 i, O8 \& C/ a. w* u
4 ?* v) P( ]( U4 b! U- function setComp(g, value) {
0 E' x4 D9 A3 j% {2 C% ? - g.setComposite(AlphaComposite.SrcOver.derive(value));
' W5 i& X: ~& g - }
复制代码 , A0 r- Z* V9 N6 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。& r* K: l) S! Y& o0 L! N3 n' _
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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)6 x' S# \! t G/ Z! y3 {
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