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% I5 N& Y6 C& I4 R7 }* O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。
+ J# I9 ]7 G) t! Z. m9 a" L7 W- importPackage (java.lang);' ^1 ? J" T2 J- N: N
- importPackage (java.awt);+ h0 ~ L1 J& ^ {
6 E8 ?* p$ M6 g! _3 c- include(Resources.id("mtrsteamloco:library/code/face.js"));
* @7 h" T: Z' [& n' M7 { - # U C3 V4 T+ E
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);; N, f# y3 s- M% K) M
% H ?+ {2 R) i% ]$ i1 C- function getW(str, font) {$ ]% j$ O, I, L. U: O% L
- let frc = Resources.getFontRenderContext();
$ m e5 r5 T: H8 x# p5 x+ ?+ ` - bounds = font.getStringBounds(str, frc);9 c1 _( U6 T0 h- G8 A( A* {
- return Math.ceil(bounds.getWidth());" @) b' w! e* h9 \' [
- }
; g5 Z$ W9 R/ q/ U% J! e5 v* l
( c9 ?# s9 i7 O/ i" Y- da = (g) => {//底图绘制
# q1 Q) Z4 U i& i% h& q" k, b - g.setColor(Color.BLACK);' K- N& s2 J3 Q/ ~: j0 E
- g.fillRect(0, 0, 400, 400);) {- a, V% v# d+ A
- }7 S. a) H# {! o0 }
1 E4 O) W! Y/ Z7 p- db = (g) => {//上层绘制
) {* b" F0 G0 w! i% [- ^4 [ - g.setColor(Color.WHITE);
) [. E+ L# A; z$ S/ b4 r - g.fillRect(0, 0, 400, 400); _* P4 c- V6 _4 X5 p8 @8 B) X
- g.setColor(Color.RED);, _# z; |% ] s
- g.setFont(font0);* Y* Y1 ?6 ]% [1 o+ ?+ p0 D# N* t
- let str = "晴纱是男娘";1 i$ N: Y4 Y. g0 v6 Y Z8 i
- let ww = 400;
% K4 ~' W1 T! I+ R( f - let w = getW(str, font0);" X3 f) \) b. |" P
- g.drawString(str, ww / 2 - w / 2, 200);4 p3 n C" u8 O+ w% g( n
- }2 }& P) [- A X/ K0 o, P
1 \, T( l, J4 m# n' ]- const mat = new Matrices();; [+ A4 o+ Y o
- mat.translate(0, 0.5, 0);) {9 [& k/ R1 R8 u1 M" A0 J
- 6 \7 n. c! A$ c" A0 A# Q* m; h
- function create(ctx, state, entity) {$ m* W$ N6 b6 N7 Y! z0 p( y
- let info = {* P r$ a" `+ X
- ctx: ctx,
" j% `1 A0 f' K1 K, c$ V - isTrain: false,0 \- L4 @, I! A8 K3 i- d
- matrices: [mat],
2 w7 ^: M$ ?8 h$ V" ]2 _" a( i, J - texture: [400, 400],6 W: Y3 S2 ~" p' _2 j2 j4 {
- model: {
$ L/ g4 C9 k/ d0 P - renderType: "light",+ q( u7 B& ~. ^6 D$ Z
- size: [1, 1],
* `9 } ?7 y# T5 S3 b8 h - uvSize: [1, 1]
( n; M& J) R, t% H6 g) N - }2 J1 W4 d; D. l
- }* y& y+ D8 e) s* F% M
- let f = new Face(info);9 ~$ {2 y# ? I: s, D1 c
- state.f = f;
, e. r+ V& Z& [( w3 a/ Q
# a5 z- u5 \' m% {- let t = f.texture;
) h4 j8 E, y5 _. r. ] - let g = t.graphics;
1 `2 Y: E& V+ F6 o - state.running = true;& y/ R1 `4 a- G) m' Q( T( Q- g
- let fps = 24;
9 r8 e# c$ [+ C7 s. j! _1 @ - da(g);//绘制底图
5 I) U5 ]2 a" N; p" ]( W9 y% Y - t.upload();
6 m+ E' D6 A8 R% ], r - let k = 0;# `! r! x# r% p8 m& w
- let ti = Date.now();
3 }' I. c- j" U, g2 h5 W" s7 r0 n - let rt = 0;
3 ?0 `0 D' q' w' k; x/ {: } - smooth = (k, v) => {// 平滑变化+ y5 _. s* d7 _* A$ w
- if (v > k) return k;
* A1 i# t: v0 ` - if (k < 0) return 0;% k' z$ g! f d) B* s
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;, A `- d7 b6 J
- }' |( Y0 S( s: k
- run = () => {// 新线程# V0 I: ~) j, B$ m) F
- let id = Thread.currentThread().getId();
4 i7 ]4 t R; M: h# V - print("Thread start:" + id);
$ S' l4 e9 A( G - while (state.running) {
6 _; v- q. c4 R4 ^5 l' x - try {. S! b5 k' c7 S" a5 F& O( h. s
- k += (Date.now() - ti) / 1000 * 0.2;; T, u8 H- h1 e; {
- ti = Date.now();
+ Z5 q, G& n( ~$ S4 f8 z - if (k > 1.5) {& r1 I5 u8 C* [) R6 T9 v! `
- k = 0;# _: u" K0 ~" w: i0 f
- }
8 X: Y# ]) J& c0 N. X - setComp(g, 1);, b2 `% e4 m* @& J/ s: Q s+ }
- da(g);
5 d: B" S- _5 x0 m& m - let kk = smooth(1, k);//平滑切换透明度
/ j" W. y' ^: P% ]8 w - setComp(g, kk);
# p5 r# |: M( T! Y& K7 s G* K - db(g);
H1 W& I# ?# | c# |" e$ x$ M - t.upload();
! V4 C4 \8 O' [% ?4 F* F4 P - ctx.setDebugInfo("rt" ,Date.now() - ti);/ J# @+ V% O" S. N
- ctx.setDebugInfo("k", k);0 e4 T8 C% e3 p' ]+ ?9 ^1 j4 Q: U
- ctx.setDebugInfo("sm", kk);
. W7 m7 v. L8 R$ O) _& V - rt = Date.now() - ti;
3 |" L; N1 W. q& G - Thread.sleep(ck(rt - 1000 / fps));
' K7 v; X1 j8 u6 [# M - ctx.setDebugInfo("error", 0)6 r5 n+ n7 ~- _% C3 D3 f
- } catch (e) {) S) \: {& |, x
- ctx.setDebugInfo("error", e);2 G+ A% @3 V- p* Q6 M' Z
- }
) B4 l5 c1 U+ ^3 _ - }0 U: y' c0 }' D, W3 @) W; n/ _+ e
- print("Thread end:" + id);
- d! ]8 d8 c7 K$ w- v9 `& b8 T - }3 ^9 v5 h7 V- J* A' |$ R
- let th = new Thread(run, "qiehuan");' t. @0 W( N4 t4 B9 N3 U+ g
- th.start();2 f" d& ?% T2 l: H* |! b& I; T$ ~* q
- }
6 t- Z* n9 t7 { - 3 D8 a- x3 d+ t! Y
- function render(ctx, state, entity) {
% x& o, F/ ~* T - state.f.tick();1 J8 h3 \+ C& @# e6 m
- }
1 Q* R3 C; Y, C! L - 7 L" T6 s7 C6 t5 a+ G! @: R1 B7 |
- function dispose(ctx, state, entity) {$ `- Q+ Q# G* \6 v, g6 B
- print("Dispose");/ z: Q$ D+ L7 y0 O! b. N
- state.running = false;, M! Y/ T" z3 Q+ T6 Q2 L& X
- state.f.close();
& I& T0 s8 A0 K9 E0 r& S# z - }
( b @7 q# X4 P6 U* I! Z
5 n# o- |6 N& N2 K- N6 |) D+ I! _6 x- function setComp(g, value) {
2 m7 m# @5 ~9 Q+ @& S3 J; i - g.setComposite(AlphaComposite.SrcOver.derive(value)); h$ u. C' N& h6 j1 q( }5 Y
- }
复制代码
/ d3 h" ~5 g J. z0 I& m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。% _8 u( ?" q# w5 G2 @! c, U
/ V2 O- Y) b- G1 l A2 q' x
* X- [; e3 W4 S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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