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q& M5 I$ V- G/ D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。
8 {, K! S8 N! C! ~4 V- importPackage (java.lang);5 u9 ^! G- ^" M6 s
- importPackage (java.awt);7 A2 l1 i6 J, r& E
" R0 K# t! {1 A7 M4 J- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);) o3 c: r/ p; b4 x; J; |8 p3 X" G
; g4 v( q& l# i- A! @- function getW(str, font) {' e; U6 j' N/ K. |3 |' U
- let frc = Resources.getFontRenderContext();
% a6 C3 \' y i - bounds = font.getStringBounds(str, frc);. m8 p: N$ p2 Y- w! t1 v9 G
- return Math.ceil(bounds.getWidth());
' \, k8 Q8 Y$ W& c1 y - }
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/ w3 d+ V6 L. i/ G- da = (g) => {//底图绘制( z2 ]4 C, Q3 d) G& z, X ^
- g.setColor(Color.BLACK);
Y/ |" ~$ M P5 p - g.fillRect(0, 0, 400, 400);0 n% Z& s6 m! v" H4 O
- }; z3 Z4 n% ]- |' t2 a! D0 P
: e. A) Q7 E9 e9 C# g- db = (g) => {//上层绘制( |1 U: Q7 H' t6 y6 x; S/ M' x
- g.setColor(Color.WHITE);
5 f, ^# z( j% h, f - g.fillRect(0, 0, 400, 400);+ A( Y! C, }" D5 E
- g.setColor(Color.RED);
0 V6 s' r) |" W! I A - g.setFont(font0);
$ O: N8 G( ^" [. }3 B - let str = "晴纱是男娘";
" B- |6 M8 R a9 q. z1 a+ Y T& Y, H - let ww = 400;) U' X$ L0 Q& M/ z
- let w = getW(str, font0);" I( F+ s( Y1 Z% ~* ]) [
- g.drawString(str, ww / 2 - w / 2, 200);7 A+ u" x2 S6 P, l5 e
- }
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$ \1 v2 V' @6 T6 O- const mat = new Matrices();
, V- F8 F: s& z; t - mat.translate(0, 0.5, 0);
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( L5 F+ Z+ m4 _9 m- function create(ctx, state, entity) {
- R/ V+ {) s+ U( A - let info = {
' P6 ?7 `1 k% p) H. B7 ?) ?8 ? - ctx: ctx,4 w9 W1 @9 I% h/ Y* t, N, Y& F8 W4 X
- isTrain: false,- P; ?" z( l# m" p$ J3 ~
- matrices: [mat],% @& A/ u" n9 Z* _
- texture: [400, 400],4 K, \' n/ f) t" X }1 q6 @
- model: {
- b2 P9 o1 r( q! c z; c" x - renderType: "light",
2 q' t7 M; @/ J, c9 a& T7 \7 e9 V/ y& M - size: [1, 1],. q8 h( O) f, B, c, c& M- l9 Q
- uvSize: [1, 1]
/ [& t$ Y' N7 H0 F1 Q$ O - }
: U2 {8 p: J) ?. f8 k9 _ - }
( `4 e( n0 q/ j3 w- V5 J' T - let f = new Face(info);0 w$ [& o" `! O
- state.f = f;
* {* p/ W8 I1 M, h, ^
8 ]: R- e5 h5 _- let t = f.texture;
) f# h0 m$ u) j' [* U9 l2 z# b - let g = t.graphics;$ i7 v0 l: k6 g& b# `1 L% K
- state.running = true;7 ]. U2 B2 g; N* n8 y0 p z
- let fps = 24;- V* _, I: H, j; {
- da(g);//绘制底图1 P+ @- Z- J( _- g1 N4 G
- t.upload();
8 `; Y7 n- W# J, @8 R3 V! P - let k = 0;
# A1 X( v' O' d( q - let ti = Date.now();, Q3 T& q) n' {' E
- let rt = 0;
- t! I7 x4 m" R2 Q7 z7 h/ o - smooth = (k, v) => {// 平滑变化
6 G a9 l5 [! o4 l2 H3 J- \ - if (v > k) return k;6 ~" A( |: K( R
- if (k < 0) return 0;' a8 y1 q% v& N' Y7 f0 }
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
$ k+ \1 R$ L9 ]$ u' u7 e& o - }2 M9 e& S5 M$ ?9 W
- run = () => {// 新线程
- C, a. U, S3 y {4 I - let id = Thread.currentThread().getId();9 O# S0 b" c( Q% e9 b
- print("Thread start:" + id);
( u; I r4 B. X% c; A( F - while (state.running) {! j! \& G! N. z: \6 {
- try {& _: K6 [9 I. B4 U5 \0 ?* ?
- k += (Date.now() - ti) / 1000 * 0.2;
1 j" Y; M1 f. E; X. ^ - ti = Date.now();: d/ d* ^# n1 |3 o% r
- if (k > 1.5) {3 W- _/ j$ l+ k7 _6 ^
- k = 0;
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- setComp(g, 1);
6 u3 _- l9 }2 I: o" g8 m# @$ K - da(g);
% Y5 H3 P5 c6 G/ P7 F2 u8 u1 b - let kk = smooth(1, k);//平滑切换透明度3 |$ ]/ o0 W; B, ^8 g2 k6 r
- setComp(g, kk);
% J$ C, t% \, s" W# r# W - db(g);! }/ D" x$ U8 P
- t.upload();
; J& t6 C! L( }/ @ - ctx.setDebugInfo("rt" ,Date.now() - ti);( J5 \8 r2 ?& H. M/ m `
- ctx.setDebugInfo("k", k);
2 p8 |( R' \; P - ctx.setDebugInfo("sm", kk);
' z, x+ ~# o1 W8 V - rt = Date.now() - ti;
6 y! e0 a) m! T) y+ G! l2 o - Thread.sleep(ck(rt - 1000 / fps));3 X7 j/ m$ L- B+ H5 |' e( M
- ctx.setDebugInfo("error", 0)
* p' s9 F, A9 {! I1 o - } catch (e) {
: Q" ]' x& _7 |5 d - ctx.setDebugInfo("error", e);! t8 g- ?8 d0 N; e2 J: U
- }
) |* h) j5 Y( f6 O, w) z - }
: q4 O% p5 D, G( V7 K4 n - print("Thread end:" + id);
7 Y+ G Q- K" {" G! s$ j' J% | - }* \1 r7 g2 W1 C) u. l/ @9 |( }
- let th = new Thread(run, "qiehuan");
5 _* |; y0 x; T. Y+ w4 I1 y% ` - th.start();
+ X: Z/ ]4 p) h9 e - }
" c; y- o4 N+ A2 B. n9 Z, r - : u5 _* L4 t. o3 d6 U$ o& Z0 V, H
- function render(ctx, state, entity) {
7 u. E1 U, {$ i, P( b2 e - state.f.tick();
% t N$ f" A' q+ p - }
! z8 n7 @' K4 _ - + [* ?0 U7 `! L; O2 g e8 @! K; X
- function dispose(ctx, state, entity) {& H7 D1 y2 n" L6 e2 V5 d9 P
- print("Dispose");
9 S/ J. V! X0 @' ]4 S - state.running = false;
4 r, i) M1 N% J( o1 @ _8 { - state.f.close();
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- + Z8 R* l2 U) p5 |/ x5 R
- function setComp(g, value) {; H6 h; Z0 `5 Z% ?2 m
- g.setComposite(AlphaComposite.SrcOver.derive(value));
# ]# l" Z1 h+ v5 ^' f - }
复制代码
& ^* n ^- E: L) {0 x3 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。
, L0 G! L9 Y1 X4 t$ {
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$ r; P" s% `: ?$ x8 W! D2 Z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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