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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。
7 ]" d5 g5 _3 E# @$ ~& j. |- importPackage (java.lang);
' ~2 H4 i' |) D& y) { - importPackage (java.awt);
/ r. {. ]: X1 K+ a* i( u* m
8 e# J& [& D4 n0 j- include(Resources.id("mtrsteamloco:library/code/face.js"));# f, K6 e. d$ l9 K& A7 o( G
- & h- w9 a6 d( I8 G9 J* Y+ u6 I3 _
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
6 X1 l" Q' V$ p" `1 F# [# L - 9 W% e' c s% l. b6 r; E' ]
- function getW(str, font) {
# @- s/ @' L$ F- k - let frc = Resources.getFontRenderContext();
. X3 P! Z6 I4 p$ q" i( p - bounds = font.getStringBounds(str, frc);- H+ k3 _+ d4 N* X7 [- ^
- return Math.ceil(bounds.getWidth());
$ A; t% [4 u, V8 P& O2 b - }3 ^0 N/ z# g- m* B) t
- `+ V% t2 x* Z }" K6 t- da = (g) => {//底图绘制. ?# X3 ~6 e+ t7 N7 a E: ]/ `' w
- g.setColor(Color.BLACK);
; X% e$ w" \( c3 d& N8 j0 g" v - g.fillRect(0, 0, 400, 400); J' N1 O0 {4 k D; d i
- }
& A. B# q5 B$ _' T
; g0 m8 ] j- D" Y& ]- db = (g) => {//上层绘制
8 {% o. i, @% ]% i7 b6 v* l7 d - g.setColor(Color.WHITE);
$ Q4 L; }' d; G' O2 I& q7 f; v - g.fillRect(0, 0, 400, 400);
9 f8 |- f$ _; A# }, j3 A - g.setColor(Color.RED);4 v/ H1 s. n4 E5 O
- g.setFont(font0);
. n" [2 ^( ?% ?. T9 f - let str = "晴纱是男娘";
( ~6 ^. \/ x( o; Y+ H G8 F - let ww = 400;: C9 R2 f( a! A: D( L1 S( a
- let w = getW(str, font0);2 t/ {& q3 A2 E* E& F
- g.drawString(str, ww / 2 - w / 2, 200);+ J; P" r$ Z! ]1 F6 R
- }" A+ Y9 B9 ?/ X
- + h: H0 W/ r0 u6 m" q( K9 B
- const mat = new Matrices();
8 U$ e' o. J2 W. x. i4 M/ ^/ n& N2 L - mat.translate(0, 0.5, 0); Z/ `/ Y( E) c4 u3 Y
' O. B% S" f1 L6 `7 B9 {; s- function create(ctx, state, entity) {$ d) f1 P1 W# n2 j# K7 b8 b) V- ^) l
- let info = {' v# H1 F# H/ |) U
- ctx: ctx,* i* j4 @ X0 M+ h
- isTrain: false,3 s O% _( @, _0 F
- matrices: [mat],2 W5 Y8 s: y, \) m
- texture: [400, 400],
5 m! B1 {! g' G# C* j. |0 n/ E& p5 Q - model: {9 g7 g0 Y$ f T! \1 d/ G2 H& H' j
- renderType: "light",7 a/ P: [% L2 n2 Y& W! @
- size: [1, 1],
, n, \* Q! d( H- U* P - uvSize: [1, 1]
1 v5 F. m5 ]0 `0 c' x; ` - }
5 @. V8 p) }( L7 [' v, J( T* l$ } - }
, f7 `6 c+ c) Z7 u' ^9 t, w - let f = new Face(info);1 B% S- @2 v' A6 v6 ~
- state.f = f;3 I: r& r1 U3 X6 g% A
; V' B0 c# d4 B& r; g; T2 _# Y- let t = f.texture;
9 o; P; I; g# N z, X6 Q0 @3 r - let g = t.graphics;
6 i" }( T& `0 ]1 L) j - state.running = true;
6 |+ w$ j+ W' r7 s. a3 t; I, R! l$ ] - let fps = 24;
; s5 |: [# h# @3 K& w - da(g);//绘制底图2 D% K& r+ ]0 y4 X5 p; o
- t.upload();; A' v2 `% ?1 {- q
- let k = 0;! H; H: v; K$ L6 d
- let ti = Date.now();
1 H& [( W0 G# i. O' U - let rt = 0;
; \7 s8 r- K8 D3 z - smooth = (k, v) => {// 平滑变化& W2 Z. X9 c8 m4 A: ^0 f& r" h& X
- if (v > k) return k;
+ h5 v: t$ p0 n. F8 a9 x - if (k < 0) return 0;
' Q# D0 R) J& x4 R$ u - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
6 [' S4 z# L9 c w" } - }
& _6 k- X' ]& n! u9 g/ r$ Q5 k/ v - run = () => {// 新线程
5 C- Z1 K/ ^5 ]% n& @. z - let id = Thread.currentThread().getId();) \& \; f# e6 U: k( [- e/ Q
- print("Thread start:" + id);
% R) X3 o. i E2 X& @ - while (state.running) {0 T& C# I0 f+ Q7 T" ]0 n
- try {
% x M6 P% d$ N( z - k += (Date.now() - ti) / 1000 * 0.2;
+ m3 M0 `* j" Y3 \! s - ti = Date.now();4 b) w: B& [' | M
- if (k > 1.5) {
. t) `) \. E2 q8 w - k = 0;
5 q9 S; X* R7 o6 r - }
/ {7 e( K2 W, O* Y# b8 v/ A - setComp(g, 1);) r! m, C" a/ i2 @( r: H. X& } N7 \
- da(g);
7 Y6 j8 ?' j- R! S1 s8 L0 L& r+ |. L - let kk = smooth(1, k);//平滑切换透明度
4 {8 a# R) q) L7 e% {+ x - setComp(g, kk);
n F! ^' O+ h0 `4 ^# r - db(g);# U% H$ M9 |4 m: Y$ J
- t.upload();: Y/ p% N) _; I: Q
- ctx.setDebugInfo("rt" ,Date.now() - ti);
. F7 L; i7 j# ?1 K - ctx.setDebugInfo("k", k);
# B, o7 Z& T; C# E/ ~ - ctx.setDebugInfo("sm", kk);
& ~$ X( d5 C; m% i' ?& Z# R - rt = Date.now() - ti;! G* o% }* P- D
- Thread.sleep(ck(rt - 1000 / fps));. E: Y3 e+ p H# N
- ctx.setDebugInfo("error", 0)
' K7 K* f( R/ I' t6 D - } catch (e) {$ o8 v& s+ a7 R# l& ^
- ctx.setDebugInfo("error", e);
, l9 W5 C, G9 B+ x: d - }
n' ]# q2 |( t/ d" j+ D$ ^ - }
y# t7 `, b' f6 o \- V - print("Thread end:" + id);
) ^1 {. h( m% Z- c- l - }
: q2 c- F. |$ I8 A& N$ W - let th = new Thread(run, "qiehuan");
5 ], N3 F) F3 [$ S6 }/ V8 R - th.start();1 |% @9 e' \6 |( ?& Q% C
- }
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- function render(ctx, state, entity) {" W! z; E! b! c8 t# a- w
- state.f.tick();
6 u0 f+ Y5 J) I7 H. g2 H0 w& m - }. e" ]1 {) y" N& S
9 M- a3 [$ \( n( Z- function dispose(ctx, state, entity) {
& F1 G2 G8 H: }+ }( |$ ~ - print("Dispose");
0 E7 Z4 G6 v; t/ h - state.running = false;0 l) g" z: a* a8 |4 T3 Z' r- g
- state.f.close();
, \* E' q Z1 I3 l; ~- F4 w5 \ - }
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) r) q. _8 r9 W/ O- function setComp(g, value) {1 R' h* Q! [$ k. ~
- g.setComposite(AlphaComposite.SrcOver.derive(value));
5 f2 [3 U( z4 D, S1 ^8 s - }
复制代码 7 ?: o, h$ F9 q( o' H- L
写了这么久的js,我便渐渐发觉使用 render 来写更新内容有局限性,比如说会拉高延迟.....等等(但可能也没什么影响?)。在这里我用新建 Thread (线程) 然后在新的 Thread 里来处理图片更新逻辑,实现丝滑切换。5 [5 V, ^: \) |; F6 S5 }
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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). y, t6 F3 ]2 S( f' s# D
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