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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。
0 O7 A* C$ M. a* C2 w! }- importPackage (java.lang);
8 y4 q$ n! U! c- b! V* m - importPackage (java.awt);0 S" p: F( {' P5 n
- ( [2 h- w" }! t/ s
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
5 ~9 X6 N/ K: x- H1 G! S
6 S: q ?+ `2 R8 x7 h n' U- function getW(str, font) {: Y& A/ Y: q& j
- let frc = Resources.getFontRenderContext();& N+ w- ?, r4 P2 I2 b, |
- bounds = font.getStringBounds(str, frc);
3 N+ C" l& |* C4 C0 | - return Math.ceil(bounds.getWidth());3 q$ Z+ ]- ?0 L: U7 ^: ]
- }
+ S0 v4 M1 @) @8 N$ o
! D+ n+ F9 `" M' B3 j1 J5 ^4 Y- da = (g) => {//底图绘制
Q9 S5 h3 T* Z9 s- v+ e3 ? - g.setColor(Color.BLACK);# R) ]) h0 Y- {. F
- g.fillRect(0, 0, 400, 400);$ _8 p& E7 ]! i; _' ]& P
- }! r; O/ q5 h1 ], ^! a0 D# ~
, W: O3 U. B" ?' |+ |- db = (g) => {//上层绘制: F2 y5 `& O+ J) j. ]
- g.setColor(Color.WHITE);
- T4 w8 ~$ P2 |; S: e - g.fillRect(0, 0, 400, 400);
. V6 x/ c1 M. H* q - g.setColor(Color.RED);& W5 U" i- U" o* x5 |
- g.setFont(font0);
. H3 |2 q, N( l - let str = "晴纱是男娘";
4 O4 p0 B. K9 m/ f! R& Y - let ww = 400;8 ~5 L. O/ h5 ]; N
- let w = getW(str, font0);
3 F5 q0 r; ?) e" R - g.drawString(str, ww / 2 - w / 2, 200);
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0 b! j$ ` D/ E o2 l: `! z/ J! k- const mat = new Matrices();! b2 ?3 H. v1 e
- mat.translate(0, 0.5, 0);
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! n- G3 g- m' o& t1 [- function create(ctx, state, entity) {; n" S" N0 I2 k, {. @& {$ [! L4 p
- let info = {. `2 o$ \+ S! G1 n: U# V% P; T
- ctx: ctx,
3 d( l, q/ [% h - isTrain: false,6 r2 A' N' v1 U) e! z
- matrices: [mat],
+ n1 q9 q! h- M* R( S& W$ R - texture: [400, 400],& Z2 {4 }) h+ n: J; N; D) L" @* G
- model: {
! r$ z* e3 g- X$ y! ?$ [5 J - renderType: "light",
7 [% m e8 Z0 i. x# H- n - size: [1, 1],4 g T* l6 [ ]' T! b
- uvSize: [1, 1]
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- }6 z- d e5 u! [+ N/ h# d
- let f = new Face(info);- x1 ~% S! C" o$ Y; q5 A
- state.f = f;
/ ?5 B2 ~% Q: ?1 L" `
% I$ B) [. b* f5 q* }" H7 [- let t = f.texture;# B. J& {9 H: o# }
- let g = t.graphics;
( s0 G# u" E& F9 f/ j - state.running = true;9 o6 S# k" E/ O. c* _& F% i
- let fps = 24;
- Z& W5 H; O7 i$ s( A1 l+ T - da(g);//绘制底图( x7 v3 f$ o& A9 I
- t.upload();
o- P: R! y) b( |* b - let k = 0;
, B1 `4 e' t- @4 j ]$ x6 `0 D; `1 r - let ti = Date.now();
2 k- M: L7 p! ~+ V9 x - let rt = 0;% W- b# c/ `2 K
- smooth = (k, v) => {// 平滑变化
: s- R) b% G1 ]5 K- u - if (v > k) return k;' X- V9 g. i) s2 m5 U
- if (k < 0) return 0;
) @2 Q) g: x% f8 Z1 i - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;) B! f2 h* f( t9 ?) F
- }) v7 t8 o y0 Z3 |/ Y' w
- run = () => {// 新线程* c1 I% w |2 V, t6 K. e5 X
- let id = Thread.currentThread().getId();
4 ^: p/ L% ]* V1 `' j - print("Thread start:" + id);; o# K9 y$ p/ {. `/ T6 C
- while (state.running) {
2 e* T* ]( L- E k5 L - try {/ S% Q3 I- P0 C3 l. X2 ]( c
- k += (Date.now() - ti) / 1000 * 0.2;* f: ~# ]- F l& e3 x# T7 \; F
- ti = Date.now();
$ \+ M" V4 z+ ]! T* S - if (k > 1.5) {+ F% h$ T$ K* O- u' p
- k = 0;
* \7 ]' G( h% v6 _3 x2 m6 U - }
: Y; y6 z! h; N - setComp(g, 1);
/ l' l/ v9 _6 F% d) n' P- u - da(g);
8 L& Y- [7 j; x( o& Y' ~ - let kk = smooth(1, k);//平滑切换透明度
: K r) i. a7 [6 b) l8 i- J* ` - setComp(g, kk);3 q- R' |( C \+ ] s
- db(g);
% M6 R% v+ \/ C1 z# h; T& y - t.upload();, L* K- z% x: n0 }( n
- ctx.setDebugInfo("rt" ,Date.now() - ti);2 C6 |. c @+ m
- ctx.setDebugInfo("k", k); ~+ `4 h& d' ~, J0 V
- ctx.setDebugInfo("sm", kk);
, O4 T0 T8 Q# Z) |( t1 @ - rt = Date.now() - ti;
3 {% H' \6 ?1 Z3 b - Thread.sleep(ck(rt - 1000 / fps));
9 {6 g& n+ d6 E3 ? - ctx.setDebugInfo("error", 0)
8 U- ]% J1 Q: U9 j- J4 i - } catch (e) {2 u- E5 ?" }. _. n* L, _
- ctx.setDebugInfo("error", e);8 B) J! a! Q0 v. D
- }
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- print("Thread end:" + id);
- c" I. c4 O9 x- c& F0 i( b - }
D( u1 V V/ U* ^ - let th = new Thread(run, "qiehuan");) m' H6 e V3 Z% p
- th.start();
& X6 K. ~4 p/ _2 O$ u - }
/ [" n- h& A2 n2 V: i) m- ]. Y
% M: ^. P4 O, k4 k" M- function render(ctx, state, entity) {6 e7 S$ Z, H0 }; o2 T8 h
- state.f.tick();
) R) X- w2 Z5 ^$ A: w3 x# L - }
: e# }' V; S8 J% f
+ [; r/ a( `5 P/ D% @ z- function dispose(ctx, state, entity) {3 k& F" a1 H C0 F) V4 Y, k
- print("Dispose");* ?; b/ s8 X8 \
- state.running = false;$ G6 ]2 x/ {, W& j8 g Z7 m
- state.f.close();
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- - I* e0 N& r( ~8 E/ c
- function setComp(g, value) {1 p. v/ D6 `5 O! l
- g.setComposite(AlphaComposite.SrcOver.derive(value));
/ w5 P7 i( c. N: B- @ - }
复制代码 $ I& `2 s" N! o# Y1 Y. U
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)# }" g3 E+ w ?. B8 t) S8 P
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