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% S3 Z/ `4 T' }$ K* s5 u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。
Y, T" \( j/ |( a- importPackage (java.lang);* h/ k2 N- I, ]3 n/ O' X/ i. ]& ], d
- importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));
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. l' p3 |; r3 q" F3 T- ?% [5 f- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);) k2 K6 y& p" \" Q2 e7 t
- & u3 d' |4 ]# ]: K2 ?- w7 N$ y
- function getW(str, font) {
% V! p9 D* e' a; O - let frc = Resources.getFontRenderContext();
* `0 ^6 W: t K2 S5 z$ S - bounds = font.getStringBounds(str, frc);
/ b7 `% @" n6 J, ] l - return Math.ceil(bounds.getWidth());
6 i3 X& j1 z! v# ?" H; u - }
9 h& x8 F% F$ A8 g- n, y - & Z1 c* w7 O2 F3 ~) D3 z6 @
- da = (g) => {//底图绘制
$ Q5 u/ S+ i0 Q, X, P - g.setColor(Color.BLACK);
- s& ?! O! w F. f' D - g.fillRect(0, 0, 400, 400);
: \! }( @) s# t9 ^ j Z7 c - } ]2 K% }/ e: e! W# }. J' x
9 U# [2 m$ U" f/ u- db = (g) => {//上层绘制! E0 \- O" Q1 i# _# o
- g.setColor(Color.WHITE);: e/ W+ H5 ^; |) Y3 ~6 o
- g.fillRect(0, 0, 400, 400);, Y: U0 J( r" n( s* u
- g.setColor(Color.RED);7 @1 E4 |# Y. Z0 l8 H- z
- g.setFont(font0);3 u2 X( I T. K& F" P) `/ L% n
- let str = "晴纱是男娘";% M8 a6 j4 W$ ^- H/ ^" I
- let ww = 400;
8 P* v" p7 q: Z* j# I - let w = getW(str, font0);
, r+ y; n$ y" Z! i - g.drawString(str, ww / 2 - w / 2, 200);+ M! q* j2 Q" q" j+ A
- }, n) Z' Z" v$ w. S/ x& Y# h
- 9 D4 N" h* {+ }4 J# v; I
- const mat = new Matrices();3 a9 A; ^2 Z& @% S
- mat.translate(0, 0.5, 0);
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% x. I: e; |6 w( B( P4 l1 d5 a* O- function create(ctx, state, entity) {; {0 k3 u0 B: J2 q0 k" U
- let info = {! M, ?* {( E% @
- ctx: ctx,
8 H" Q/ V: `+ @6 N; z - isTrain: false,; v# b/ c4 s+ c u" C
- matrices: [mat],
- S3 y/ k; R. i R: U - texture: [400, 400],( ]. Z: R1 y5 C2 w
- model: {* X3 z5 U" ^2 x. N
- renderType: "light",
) b0 [7 h- a3 o7 M& ~- S - size: [1, 1],
: }+ p5 Z1 h( |! s7 s0 R$ L - uvSize: [1, 1]
( U* h% q9 j9 e7 a - }
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- let f = new Face(info);
{* P8 B9 _2 l( e+ ?: W6 Z - state.f = f;. F$ i. m: o# E+ o+ @ E2 L6 y
- 0 c7 b! S# Z- O' }6 O- j
- let t = f.texture;
7 L1 C5 @& K( D5 m+ j+ X7 P - let g = t.graphics;- B3 F- f. [% {) \
- state.running = true;- _3 l) f/ p, _7 z: u. j: a- l, a1 E
- let fps = 24;* D) V, V- H' [0 k9 C+ S3 p
- da(g);//绘制底图
- t8 w) a! |4 F/ r - t.upload();
H) S2 I! E: T) o9 m - let k = 0;. ~( P4 q8 h7 j$ g4 W
- let ti = Date.now();
+ b# i- \# W' a" e: c - let rt = 0;
) x/ m. W r/ _4 V7 i6 Z8 d - smooth = (k, v) => {// 平滑变化+ C8 r# |+ S. v. A- C% \. i
- if (v > k) return k;
4 G1 U- ]; A- { f2 ]" @3 I - if (k < 0) return 0;
* ^" [; q' l% A& C# j( `* s - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
( @8 G0 k$ J; t0 K% L7 C - }( Q$ k8 d2 }( Y7 |# m+ ]
- run = () => {// 新线程0 b* Z$ M' b! V0 J$ w b# _
- let id = Thread.currentThread().getId();6 c( X2 O" F& m' r2 j6 z
- print("Thread start:" + id);3 f {2 j/ ?% _9 L
- while (state.running) {
7 D7 @* @8 C) d9 d9 S$ n - try {3 D+ W2 [7 |* K" C$ C8 W
- k += (Date.now() - ti) / 1000 * 0.2;
# G1 r+ Z4 f# Q3 R+ k, v: Q - ti = Date.now();
Q* j1 o3 K3 D - if (k > 1.5) {
9 m9 q( u/ \/ o# r9 [6 S" B - k = 0;! Q! U8 @" a4 f' H# S
- }
& E3 m: s+ j: T' G7 y$ v. d - setComp(g, 1); G+ J+ y& [; v( E
- da(g);$ L% I9 t! O% o
- let kk = smooth(1, k);//平滑切换透明度
- t: A% n$ V; l' _ - setComp(g, kk);
- l2 \( V9 X& E+ y7 |7 |, k+ j - db(g);
3 K1 y' s3 q% k5 y4 j - t.upload();
: {0 g' X7 x: s8 C - ctx.setDebugInfo("rt" ,Date.now() - ti);
; s% D. J0 n3 J i8 @% D - ctx.setDebugInfo("k", k);
9 c1 u8 a% e$ Q# C# e, o - ctx.setDebugInfo("sm", kk);# V# E; {. B& D
- rt = Date.now() - ti;
, @% k) k, R( L# k; Z2 G) |' y - Thread.sleep(ck(rt - 1000 / fps));5 t' m% ^7 j0 D
- ctx.setDebugInfo("error", 0), k5 A" K' e) n0 P9 |* v# {
- } catch (e) {4 C% ~, |) k( d1 J: H L" T
- ctx.setDebugInfo("error", e);" r E$ b. I( o q9 Q B
- }) Y+ s1 f3 b8 S+ n8 N- ~
- }
9 P* U! {, L; d3 b) w3 w6 B - print("Thread end:" + id);
4 [" W7 g. Z+ \5 U$ R - }
% w4 s. r0 F* T! S( ~ - let th = new Thread(run, "qiehuan");
: m- S& C2 h; @4 N+ Q! l$ V - th.start();
+ e/ p5 Z9 x6 p# {# T0 u - }3 S6 K: I; G# V# f3 Q
/ w( b: y/ X- y/ k; y* A- function render(ctx, state, entity) {
+ i" z- l( w( i. S - state.f.tick();; y( _9 }- g) t. \/ h3 k9 |# y
- }
' x0 f. p6 t8 ^" p5 h ?( k
0 ^' t8 @% j6 D7 M- y/ M9 r- function dispose(ctx, state, entity) {& j: I) f' D9 s" c
- print("Dispose");
j+ z* m- a- I0 A6 y) a) z - state.running = false;
; Q/ a3 V4 L6 @! Z( \ - state.f.close();
7 f4 ` S: Z4 I( x - }$ `- }; U- q( h4 u& |* \4 W: a
+ X* b3 J6 E& C3 p- O q, e- function setComp(g, value) {: z0 i: @ B/ U) b8 N% S1 j7 x
- g.setComposite(AlphaComposite.SrcOver.derive(value));6 g8 @4 b% |; E3 S, c% J. x
- }
复制代码 / |1 e9 \+ K. O& J, s
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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