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5 y" X! W+ a6 g8 e! w, L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。
: F0 F: E# F3 J' m' A4 @3 }- importPackage (java.lang);
* ^, o8 x# N& y - importPackage (java.awt);: k/ [ w4 ^! t& V+ r
- 2 B9 d0 ^% g; r- O; r) C) g
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);3 G% B& n) i8 g% Y0 g: B9 h: V
- ) R5 v1 j4 s( x0 C
- function getW(str, font) {& R b! i- z1 e- [5 @6 O
- let frc = Resources.getFontRenderContext();, J3 B9 z/ w0 [" t# Y1 J$ ^
- bounds = font.getStringBounds(str, frc);1 B0 ]7 v7 G4 ^
- return Math.ceil(bounds.getWidth());
& S- t: N6 T1 H4 e6 j - }
/ L f' e0 \2 K/ D3 ]6 i# \9 y# z
: x' V) d8 G# g) Q4 s) C9 o& a- da = (g) => {//底图绘制& q5 a* ~) o2 B* ]: I, S- v
- g.setColor(Color.BLACK);/ {7 S _9 w) t
- g.fillRect(0, 0, 400, 400);
( g+ T% t/ q% g! Z9 f+ e8 v - }
" F7 s* n! s4 F' [) z: ?8 W - " O6 V8 M1 W) }
- db = (g) => {//上层绘制
3 g5 s+ u0 x) y7 j7 ~ - g.setColor(Color.WHITE);
% k4 v% g% W+ J2 p% [ - g.fillRect(0, 0, 400, 400);4 P! C6 D( t( G
- g.setColor(Color.RED);
- c1 s! h* b: [' y8 |, m9 S/ i! B - g.setFont(font0);
5 i4 { e C0 ~/ ? p - let str = "晴纱是男娘";& P0 I1 G& i) m$ F& D: h
- let ww = 400;
& C1 C6 ^# l" T- k8 S - let w = getW(str, font0);! [$ b$ S, u) F$ q$ U
- g.drawString(str, ww / 2 - w / 2, 200);
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- , o: V; x( G5 G+ }) O
- const mat = new Matrices();8 b- E1 s6 B" i" S4 M
- mat.translate(0, 0.5, 0);, p! u% v4 O4 F! o2 q0 S1 o9 H
- c5 B8 _& x: y/ P& d M9 C# A# o- i( H
- function create(ctx, state, entity) {
! d. R) m5 m2 ~% p7 H9 f - let info = {
. \+ D( O' Q4 h! J/ N% ]/ | - ctx: ctx,
& l3 \1 o" o F2 p: ^2 W- X% \ - isTrain: false,
7 h- ~% u2 B( n9 D6 O- C' G - matrices: [mat],4 |6 z) A% N0 |4 a- b
- texture: [400, 400],
3 _5 f( ?! W; s$ x! }; f" D - model: {
4 T2 b6 n6 |/ Q% ]# G3 u5 u - renderType: "light",
]6 {- q( V3 d w - size: [1, 1],
1 A: |1 d* O5 q7 I& @$ N - uvSize: [1, 1]
) N# V# f# b F R - }. @" x0 x' D9 f) z% [; a/ ^; _+ X7 x
- }2 x- O) X' g0 Y) e6 n* [
- let f = new Face(info);
7 U7 `& m' [. d( n# c( ]! G ?) t - state.f = f;5 [" m6 B# d" v0 L7 M
- & `. ?5 `0 G6 K+ a
- let t = f.texture;
7 c# G, e6 t h9 v - let g = t.graphics;
1 M {) f& u9 L: |& g1 v2 W$ C - state.running = true;4 g4 L7 i9 E5 q( V
- let fps = 24;
* d. K5 H+ Z% M+ z, M T' x - da(g);//绘制底图6 B4 B R3 X: E5 f% D
- t.upload();4 l( o7 a; H% H6 H& K$ f
- let k = 0;
$ M0 I8 c$ Y4 Y0 P - let ti = Date.now();
, H- W" n# X2 P! G2 H6 r - let rt = 0;
$ V" `2 | D2 `1 a# O+ s2 C+ S. b - smooth = (k, v) => {// 平滑变化
2 v; z7 w/ r7 `: a$ W - if (v > k) return k;* T$ k" {5 c7 G& T" `( [; @ Y
- if (k < 0) return 0;# U0 G/ J. @9 L* P" _+ v; {3 ^
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;9 _% \1 _2 t6 a
- }7 Y: y K- _$ G- m6 j) I" [. _
- run = () => {// 新线程+ {" J( |. h' j
- let id = Thread.currentThread().getId();. r" X% N j3 n! k& [& K* F
- print("Thread start:" + id);4 q% [- Y h5 E9 U N
- while (state.running) {$ s% l+ z9 f: l# `! g L
- try {3 ^) a; A" v* {, b
- k += (Date.now() - ti) / 1000 * 0.2;1 Y" q0 f( [8 {: e% f
- ti = Date.now();3 Z( N. @* d- _/ |) q- U
- if (k > 1.5) {
; L# h2 n1 t0 h4 K7 x - k = 0;
$ k0 U# m+ S5 P - }1 \( r& ` A5 E5 M3 H5 V
- setComp(g, 1);7 w! k" D- P9 o. Z: s( f+ L! X
- da(g);2 `* V5 U* R0 H
- let kk = smooth(1, k);//平滑切换透明度
$ p. O/ m. s6 c! S) {* t& p - setComp(g, kk);
9 M3 F9 }7 z1 _1 p9 E - db(g);1 N N3 q! d4 y$ T% u P1 {
- t.upload();
$ o+ t; u' u8 l6 z$ }/ } - ctx.setDebugInfo("rt" ,Date.now() - ti);
# y8 h- F# {% C4 H/ u/ a2 U/ Z9 s - ctx.setDebugInfo("k", k);
3 F- l" x7 W4 ?3 Z) H* L5 h - ctx.setDebugInfo("sm", kk);% `( F! A* D9 M+ u' A; A; b
- rt = Date.now() - ti;. h; h b1 T4 k4 H
- Thread.sleep(ck(rt - 1000 / fps));
; l7 A) B8 r6 q/ v/ w! e" `9 e - ctx.setDebugInfo("error", 0)$ X, Y5 a" \7 Y9 g7 v
- } catch (e) {3 W, J. G5 h' b1 e# {
- ctx.setDebugInfo("error", e);
0 j6 I) H# o6 `, {& ~6 M/ ^ - }
4 _, U' j4 Y3 P" d8 i2 j( H" O; B - }
- B" g9 t$ e* _ - print("Thread end:" + id);+ J0 j; ^+ Q: i2 J% Q
- }
1 l2 }; V p) ~+ N9 ]" U9 C/ T' L* H - let th = new Thread(run, "qiehuan");4 y; }3 A0 q Y2 Q
- th.start();
4 g- a* V3 ?# ? - }
3 |6 S* P9 f$ j$ P% V% W9 E
" Y- I6 F+ k6 Q# m' \# s- function render(ctx, state, entity) {* x& n" Z$ b. w/ \. F, {$ o
- state.f.tick();; ?6 w! b# a4 Q" c- d
- }5 y' T2 n( l2 M) p' N- d9 ?
- 2 E' _! Q& g! K' \1 B
- function dispose(ctx, state, entity) {; d& o7 C5 g* w# @& ~& M+ \
- print("Dispose");
* v) C$ b" F* v - state.running = false;- `& J6 S- S Q
- state.f.close();% j) P- f2 S2 X1 M0 l/ @
- }
. e) `& w6 S) n( ]: K* s& U/ V - 9 L/ V4 \0 I, W. Y! \, \0 K9 O
- function setComp(g, value) {
" k+ n- G7 p. Q" ]* Q( Z - g.setComposite(AlphaComposite.SrcOver.derive(value));/ f) H: G% x1 ^
- }
复制代码 % u0 k' Q$ D0 q# q1 F
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。$ l6 o# q; } r5 g
8 B1 S6 _- L% D& C* i
& O$ m ~' @7 @* C; g$ w: f) [顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)3 P/ j. @- _% H* c( |
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