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9 I4 u% ^; r/ Y9 n _) f* X% Z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。
! V2 d. c) z7 C& o- importPackage (java.lang);/ \4 t, y1 m$ G: s& K
- importPackage (java.awt);. ~" i( {+ L' t3 l
- 4 Y4 J1 r1 l y* f! Q
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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, _' \. Q* u( X0 X- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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- function getW(str, font) {
: m! Q% V" r1 N$ M8 D - let frc = Resources.getFontRenderContext();
* R, B$ M8 P* B$ r - bounds = font.getStringBounds(str, frc);
( |) Y8 c- g C7 i4 k - return Math.ceil(bounds.getWidth());/ ?& ^; d) t, E6 M; @+ d
- }
9 ~* ^3 c z' j# o - + z, R4 ^( E F# P! l; w
- da = (g) => {//底图绘制
! @, k$ e2 C+ H3 W+ m" g* F - g.setColor(Color.BLACK);0 {7 I9 l& d: ] S, ]
- g.fillRect(0, 0, 400, 400);
$ n7 b1 G" f+ H8 w, L - }6 p# ]' X# S. }' U* D
- $ _% Q" j. Y( @$ _2 }( r4 v* O* @
- db = (g) => {//上层绘制
7 V$ B% N" ?6 Q9 F - g.setColor(Color.WHITE);% |8 w. b2 w( |. h: c7 n( c3 y
- g.fillRect(0, 0, 400, 400);
3 G G1 Q0 S; d. t4 u - g.setColor(Color.RED);
3 v; [" v' O% d: R, E/ Z: q - g.setFont(font0);
3 ^7 ~8 {( ~- G, N7 w8 m: o; O - let str = "晴纱是男娘";
" z. C0 ^6 ^6 i9 Q, O- _; C - let ww = 400;7 P) Y4 ^- q a# X
- let w = getW(str, font0);
. c% ^3 |2 v# q; w- k - g.drawString(str, ww / 2 - w / 2, 200);
; X. T, Z% }, W9 x8 c - }* `" i0 E' h2 _; a4 V z% g% x
- ; j% i: {/ ]0 n: \- g
- const mat = new Matrices();
3 t% K7 L; G* f - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {
2 H7 a% h# i- D! ]: p# Z% Q: K - let info = {0 j# T3 H: I) K/ s3 s+ ^
- ctx: ctx,
# P8 z t ]5 O - isTrain: false,1 ]3 I, P% i3 y3 `7 p# l4 H
- matrices: [mat],5 P0 \. e( C, H* K, g( @
- texture: [400, 400],7 U$ W3 d. t+ `" k7 e
- model: {
6 N" q5 _1 _! Q - renderType: "light",
; X o- V q8 f - size: [1, 1],* |1 S# i0 L9 \1 d8 G- w( |
- uvSize: [1, 1]
7 I9 B5 w1 {+ j8 H# C7 Z6 m1 p. l6 c+ R - }8 {0 S; E+ u, p' ^# A3 d8 g8 l9 ^
- }
# M; h: y4 }6 t( |! R - let f = new Face(info);) \/ W0 W) l" x. t+ q( t
- state.f = f;
[0 \9 O$ Y4 t0 }# [0 Y
; S0 m7 b" s# ]+ \0 n7 ^2 i- let t = f.texture;
6 p0 [- F1 ]8 g - let g = t.graphics;5 E& B- H6 |2 x1 ]
- state.running = true;- F; S+ u, s" ?& \0 E1 h, h
- let fps = 24;
/ F5 e, g* ~: ~/ \6 R. \ - da(g);//绘制底图4 Z* |! m( r8 B1 C- b
- t.upload();
* l, z4 k# g0 Q& M$ ? - let k = 0;
8 z" v x- }6 H2 y' h - let ti = Date.now();
( W) y1 G/ t: A G9 N - let rt = 0;
1 t8 F: Z( _ N8 e8 G3 A - smooth = (k, v) => {// 平滑变化' Y( n. s) b" I9 d. ^
- if (v > k) return k;
+ @7 ~8 D4 P+ Y% i7 @* ?' z6 \ `) S3 t - if (k < 0) return 0;
9 z$ `8 R7 T$ Z6 } ~ - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;- X5 r4 F9 {. Y. l: Z; u
- }
) ]' I$ }7 n) Z; `, Y! p - run = () => {// 新线程
8 s" I. n) j, t - let id = Thread.currentThread().getId();' E1 q* B6 f9 K. L' m- d
- print("Thread start:" + id);: H$ d" ?, L J9 F
- while (state.running) {. e/ M4 |6 k- _* q3 B6 S
- try {4 z2 {9 j& e6 j. U! e: P
- k += (Date.now() - ti) / 1000 * 0.2;
, N% t9 K" c$ N6 @7 c - ti = Date.now();+ \3 F- P3 Q! }3 G, t1 N) F% ?
- if (k > 1.5) {0 |( s4 a9 _9 w' c5 ?& o
- k = 0;
; x5 F4 ]. Z' l; c+ e( g5 z7 O6 G* Q) A - }( k `. p$ w9 X! f. {: E2 ~+ _; c
- setComp(g, 1);
1 A: f, [" x& I/ A6 y - da(g);
5 a0 s2 p; c) J9 C, M+ d' W - let kk = smooth(1, k);//平滑切换透明度4 e# @' G& g0 g2 R7 Y
- setComp(g, kk);
5 {% x* D, Y. C3 C - db(g);
/ o; _- O- ?6 m. L2 L - t.upload();3 E2 w5 ]8 X+ d% G6 s
- ctx.setDebugInfo("rt" ,Date.now() - ti);, y4 S b$ T! k2 W3 X! k' u
- ctx.setDebugInfo("k", k);
1 a" b% v" O+ P4 C( h' Z - ctx.setDebugInfo("sm", kk);
! @1 k0 m3 T5 i |. _ - rt = Date.now() - ti;! ]# d; g p* J( w1 M
- Thread.sleep(ck(rt - 1000 / fps));
6 K/ T7 n: `- | H( r: Y/ \ - ctx.setDebugInfo("error", 0)- X! c a6 b0 `7 o8 i* _
- } catch (e) {
* ?% b% b: A; K F% m7 u - ctx.setDebugInfo("error", e);9 |- s3 V5 p* J1 o& ^% O& Z
- }& I( V* x3 Y) x1 ]8 H; ?5 G
- }
9 A9 x, X1 W+ \9 \* @ - print("Thread end:" + id);
5 P# A g" [4 M - }( [: k# B. s0 [0 {7 d
- let th = new Thread(run, "qiehuan");
5 ?5 p C; _4 I' x% ]! Y9 k - th.start();5 e" r3 x% T. O8 I# ?
- }
$ s6 q: C) n; W6 s! ]
; H' m: d& r0 G4 ~3 H3 I- function render(ctx, state, entity) {6 M. B2 T( j3 c; N" d" s5 Z* q
- state.f.tick();0 y- ]2 C6 V. U# c& I" }! N* j
- }# r$ Q; ~8 Y& C+ U; E: W$ O
- S- y8 e' C9 e$ G
- function dispose(ctx, state, entity) {6 W& G% a- o: A
- print("Dispose");
/ r0 X( u$ Y+ s# ?% j- Q - state.running = false;
1 K+ E+ T0 g. W8 B1 o - state.f.close();) T7 S; m% y1 |1 i/ ~
- }( u; J, ^% J# k) i! u
/ G9 I3 i( y7 f$ p. b2 @- function setComp(g, value) {
" v; [$ O* W1 O - g.setComposite(AlphaComposite.SrcOver.derive(value));
C+ w# J. O+ [: e F2 i - }
复制代码 ( Y( H1 ~$ _' x1 Y! h9 r' k
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)& {+ T1 G" m4 K9 r1 ?& @4 [' E
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