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' u/ ^7 d1 e/ V' `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。
' @4 Q/ N, a! W; M/ H- importPackage (java.lang);
; L) E% M6 X$ [8 H0 ^4 H1 ? - importPackage (java.awt);9 S. i* [' I- J
- * ?' [3 l! w+ i% r% h9 h0 ^
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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2 ^( E/ d% o/ Z0 \- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);. |* p" r9 o# A% v
- - Z. G" D- {* v& D* K4 D+ Z& t
- function getW(str, font) {
% v8 l8 A9 i+ C. a5 p$ { - let frc = Resources.getFontRenderContext();7 Y1 Q! J; t5 I
- bounds = font.getStringBounds(str, frc);9 o0 U: H, \! N% W2 R
- return Math.ceil(bounds.getWidth());
2 M" x# U% u& ?5 M - }
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- da = (g) => {//底图绘制. P& o: }8 d* ?6 S/ C g/ d1 l
- g.setColor(Color.BLACK);
- t9 Q' b5 L/ q* f) ?" w - g.fillRect(0, 0, 400, 400);
2 z+ i& R) ]- [ - }
( L/ s D* ?. }% }5 Q- i2 Q
2 V( J4 @/ I6 D0 y( G0 w" k3 ]. L) A- db = (g) => {//上层绘制+ v- I: @ f" y* ^/ E0 S
- g.setColor(Color.WHITE);5 Z4 m' l. t9 c
- g.fillRect(0, 0, 400, 400);1 n8 d6 X: s7 Z; f: s( c
- g.setColor(Color.RED);4 W8 p8 l; |+ K, n" C
- g.setFont(font0);1 t! f, A. N( u& j% I+ ]0 ]; e
- let str = "晴纱是男娘";
! h# C, L: Q* r3 I - let ww = 400;* ]. q, S8 d" u3 a+ L; z% l
- let w = getW(str, font0); h+ p7 Z \$ V( I- j4 N. c! e
- g.drawString(str, ww / 2 - w / 2, 200);
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: ]9 u( @( m" `! i2 f1 A" N- const mat = new Matrices();2 P5 x& j4 j1 A1 X1 z& A% N: h$ b" z
- mat.translate(0, 0.5, 0);- w; T+ t+ Q+ {# }5 q
) m$ k% W) H2 u5 U- function create(ctx, state, entity) {
. |* ^" |4 Q. r5 O' @) D s3 v - let info = {
) C+ w% l/ h" d$ K5 s - ctx: ctx,
% u& w; p* F- z' K& Y: D* I* j& E - isTrain: false,( C* _4 {* x& v9 V- L5 v- X/ k
- matrices: [mat],
) m! L. x% [8 C. P4 H+ f0 G$ j - texture: [400, 400],; V# e. ^* r2 o* T- O% q4 M
- model: {
% }+ m. R% A+ c) C' B+ n* F$ a - renderType: "light"," x6 h0 z. Y, ]2 w# i
- size: [1, 1],- ~% j/ w- F$ F- N1 n
- uvSize: [1, 1]2 a1 n' E5 H& t- l, f2 h
- }+ P4 }7 ~; K4 i2 u, _6 u
- }, ^' u5 O/ I5 }4 d) c4 w# Y8 ^
- let f = new Face(info);
4 u2 ?- Z: `3 | - state.f = f;
- P( n' T6 J$ M) w& H% V+ i$ n* n - 9 h2 H/ t% m5 i0 A) V% H+ I
- let t = f.texture;
! C& \% T" @+ O) E2 p - let g = t.graphics;
3 n1 }) J E% J4 m% F+ J4 Y - state.running = true;
+ y9 l9 |+ k9 Z- X I - let fps = 24;
7 w2 x* A- p+ u6 L/ A* b - da(g);//绘制底图
1 C8 S* ?$ f5 ^& b9 o" a - t.upload();
% @' [5 Q, R9 a# t. ? q! x8 s2 t - let k = 0; L( f0 V6 r. b9 q
- let ti = Date.now();0 k: a" o9 O4 v
- let rt = 0;1 s) h$ i* P- ?; z6 H7 B7 U$ h
- smooth = (k, v) => {// 平滑变化
& W* M# g z! O* J( G - if (v > k) return k;
) [+ `0 Y0 `8 [5 {/ Q: ^6 {7 n- l - if (k < 0) return 0;* n5 ], b5 P1 O9 m+ _
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;9 Y! c0 T3 b, }( O
- }, a! d. B" W2 j8 E+ Q6 {/ D% }! S
- run = () => {// 新线程
, ]7 s+ _* A2 @& z+ l4 L5 Y9 { `5 f - let id = Thread.currentThread().getId();. p" Q3 v$ K4 Q$ m( b
- print("Thread start:" + id);; ^4 j5 ~. K( r" w
- while (state.running) {' z( E) r7 B: i4 U% J( Y
- try {$ }* @6 u2 W4 R$ q7 I, t
- k += (Date.now() - ti) / 1000 * 0.2;$ j9 d/ H6 K7 M$ A
- ti = Date.now();$ t% c' ~2 L5 m" r
- if (k > 1.5) {
& `3 v3 Q' K( @( X* w& E - k = 0;' k) ^* U, f( M" C7 h
- }
- J! h; R; Z. [8 A* {. {: L - setComp(g, 1);
/ n$ c) r5 j& l* K& \- u - da(g);. a0 ^4 r+ ~1 A# e% g
- let kk = smooth(1, k);//平滑切换透明度
0 K* F9 y5 l' p% A4 Y) { - setComp(g, kk);
D0 B, L# C( t* V, y - db(g);
0 U4 T- f. i, y* @ z5 x - t.upload();7 S" y$ F* ?# Y! v4 K: L
- ctx.setDebugInfo("rt" ,Date.now() - ti);
7 `; t" j$ P2 L# D: y - ctx.setDebugInfo("k", k);/ o b, N9 Q9 x6 F, P8 J+ t( o
- ctx.setDebugInfo("sm", kk);/ [4 o' H3 J; e2 R
- rt = Date.now() - ti;' o2 j' z% Q* n
- Thread.sleep(ck(rt - 1000 / fps));: t9 s1 E4 C" I/ c1 Q
- ctx.setDebugInfo("error", 0)- Q; N9 M3 ^' y Q2 ^6 f
- } catch (e) {
, a J1 ^/ e- v$ R/ T - ctx.setDebugInfo("error", e);/ }; X! B6 {" L; h7 h
- }
. n0 \" L) s# G. q! M8 N - }6 x7 O4 V+ h7 p7 R
- print("Thread end:" + id);2 @( T6 _+ q5 R6 k$ U0 E0 `9 ~
- }
`) I ]) l5 I5 @$ f' e" E- k3 f# Z - let th = new Thread(run, "qiehuan");$ Y. z* |5 y* a
- th.start();
0 d, I" }( M% Y" F( B2 e - }- ~( U% Z6 w- v8 `& A
8 ?& {7 f# n7 c" y- function render(ctx, state, entity) {
^9 o: w% b# Z. g - state.f.tick();
. m8 e, Y( X' Y3 Z, Y% Q - }
+ I' l6 w" @% L, z+ Y; Y - + L) H# |, S3 H4 N9 Z- \0 I
- function dispose(ctx, state, entity) {
7 q& p! [5 Q5 c# [. | - print("Dispose");) i" W7 M: z& t9 `3 ~" K9 ~* \
- state.running = false;
* u8 C/ e/ N* H! e I, L1 F - state.f.close();* b/ |' c# f' l Y
- }) t2 I( P. {/ T: S* i. @$ a
- 9 x( \ o1 z: x8 x% ~( U- ]
- function setComp(g, value) {
. e! |/ ~# s; K, { - g.setComposite(AlphaComposite.SrcOver.derive(value));, I, l1 K5 d2 A0 s. g
- }
复制代码
" j0 `7 \5 k; 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。
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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)
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