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. S% h' L% i% J! j3 {" ?4 S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。
" q; n" q& ]2 m8 B- W! F+ w3 ?- importPackage (java.lang);
9 I F+ ]$ R$ Z: X$ V/ J - importPackage (java.awt);
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0 [* J9 i! Z- M5 D7 s6 U2 R- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80); @, e- ~# B9 [8 ` J6 ~0 {
1 x$ o5 e. ^: {+ X. {& d9 Q1 _& T& c- function getW(str, font) {
4 P+ J, u4 Z( [! j6 o( D - let frc = Resources.getFontRenderContext();) V E1 q' e; b
- bounds = font.getStringBounds(str, frc);3 N) k& k8 {1 N/ J' m/ ?/ G
- return Math.ceil(bounds.getWidth());
/ I3 g& D E1 M5 s - }; b% ?! f. Y x; }
- $ o. W8 e% R: D2 e
- da = (g) => {//底图绘制) h1 x; c2 U+ n9 P- P9 t" n" G+ V3 o. f8 _
- g.setColor(Color.BLACK);
: h0 e7 O( `) d0 g - g.fillRect(0, 0, 400, 400);
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3 a: o) R& q7 {$ h" h2 x I. o- db = (g) => {//上层绘制
& m0 Z4 D- s5 ~$ z. V - g.setColor(Color.WHITE);8 f7 l, f7 K% M# K9 Z- L% k! ]
- g.fillRect(0, 0, 400, 400);
* K) J- j; H! W' C' D& z i - g.setColor(Color.RED);& N- m: n7 g. o5 X# j" H
- g.setFont(font0);% o$ R2 | C$ x' I* y: j/ t2 H+ y" x
- let str = "晴纱是男娘";
t7 a# h0 f& e - let ww = 400;
, _9 u- c7 v4 O) |- Z! H) \6 g - let w = getW(str, font0);
6 L ~2 Z6 F$ j$ P) D2 n - g.drawString(str, ww / 2 - w / 2, 200);2 Q' @# U4 W% c1 X; q
- }
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- const mat = new Matrices();" N$ p3 I) H: H6 G
- mat.translate(0, 0.5, 0);0 D6 D1 D, k# `- W' I: e
- _) v" D& Z+ m, |- function create(ctx, state, entity) {
' b- D, a; v: A: \, f" \5 }% {0 F - let info = {5 a3 Y) V- B4 m( p
- ctx: ctx," c6 n4 d! y6 z2 m; j
- isTrain: false,( j( W# Q+ w6 ]- u2 A: M2 l) \8 J1 t
- matrices: [mat],
# g# r7 h! b# j; F: Y# m1 N - texture: [400, 400],) W- |+ Y/ j: o8 ]
- model: {, z; M/ h$ F% R6 w
- renderType: "light",
. \ C; ^0 L, Z, u G9 J; W5 w - size: [1, 1],
7 Z' g; }, ^) j. m2 O' Y - uvSize: [1, 1]
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- }5 o8 _6 W& n; c+ l. @: M [/ a3 J# r
- let f = new Face(info);* p, ~# I: v) N0 I! E$ e3 E
- state.f = f;+ o" b0 |) Y, J" A; u
- 6 h: Z, C1 E- ^! m/ E
- let t = f.texture;) B( T& g; u* V" ?
- let g = t.graphics;
" [4 o" \- O9 M& w. a) ^2 k4 d - state.running = true;
5 n2 ?0 p! {& L3 I - let fps = 24;
+ u @ ?( s9 t9 J - da(g);//绘制底图
, V/ F. E$ N0 A6 R! e& X" o - t.upload();) M9 u. @& | k# B* s; E2 a
- let k = 0;/ [8 {8 v5 x' i# G8 L$ ]8 u0 C! o5 G
- let ti = Date.now();
, X# q, j) a# O" e - let rt = 0;& i- v2 u4 R% ^
- smooth = (k, v) => {// 平滑变化$ Q$ v& t, Z, K. h1 \, X
- if (v > k) return k;6 l. m1 n0 y) s* L, v
- if (k < 0) return 0;0 i9 R4 v: I+ R/ }7 Y& p
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;5 H4 G/ m7 B2 Z& y7 Y
- }
+ u0 y# b z" ^1 R6 |& d/ A2 s9 P0 W; p - run = () => {// 新线程% {& S3 Q! n( F* t
- let id = Thread.currentThread().getId();2 B* m2 i' }. Z9 {' e) l4 D3 H u
- print("Thread start:" + id);% f5 `/ l* K/ G( L
- while (state.running) {
: X8 e+ H! d3 b0 _2 P5 |5 Q' G8 ^ - try {3 q* V; `8 F1 \; \' P4 [
- k += (Date.now() - ti) / 1000 * 0.2;9 M3 [. a. \% t1 \9 E- X. P
- ti = Date.now();
. p, k# H' q! v* h. R - if (k > 1.5) {
: E! a" M7 z' s+ w+ j - k = 0;$ [9 H5 v! F$ p; A7 V5 m; I( i- k& B
- }; m6 r# S4 U7 p& G7 y
- setComp(g, 1);' _. h y: e9 N$ E
- da(g);
) P# ^5 N8 V9 ]$ ?5 p9 p! ]8 A - let kk = smooth(1, k);//平滑切换透明度
: V$ P! l7 w8 M - setComp(g, kk);
- \, b- u6 u# I/ b y) W' G - db(g);' U. S/ _1 H9 Z% Z
- t.upload();
6 t4 L7 L- k! V - ctx.setDebugInfo("rt" ,Date.now() - ti);
+ {. f+ ^& X( p2 w - ctx.setDebugInfo("k", k);
0 h" d5 |- U) l, L9 j& } - ctx.setDebugInfo("sm", kk);$ d. e0 V& U5 \1 _
- rt = Date.now() - ti;4 I2 S7 _- b H( x3 H, ^( O
- Thread.sleep(ck(rt - 1000 / fps));. _4 ^$ E% r1 Q5 c' j l/ c
- ctx.setDebugInfo("error", 0) Z6 e. }1 A" o0 F5 R# Z. l
- } catch (e) {
- p" H }2 B6 T+ |$ T0 I - ctx.setDebugInfo("error", e);
. n8 A4 S6 Z( ?! a+ j% n - }
; @5 `9 j: ~! I2 d - }
- k* D9 n1 S" R3 {3 j! N - print("Thread end:" + id);
- a/ A. b: t+ y2 l7 \ - }* [/ h: B7 M; @) K/ L, b+ g+ M
- let th = new Thread(run, "qiehuan");
0 }5 g0 g' |# n _& F - th.start();! l, r: _) `+ d. v4 S7 u
- }- v1 F. f# T' O5 e$ a( m) }! y
- ) h5 G* ?1 n* R& C: O) x
- function render(ctx, state, entity) {
- G0 K+ n# ]" f. J6 { n: l7 Y1 R - state.f.tick();
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- v0 p$ W! P2 W
- function dispose(ctx, state, entity) {
: w+ d- v# d8 V0 B - print("Dispose"); R$ q1 | z3 Z+ g! F) [
- state.running = false;( d5 F3 Z4 m7 m* y- u- \
- state.f.close();8 R+ [% _: e" j
- }
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$ {1 m/ K, C) w: ~" q4 E- function setComp(g, value) {, |3 \# a$ H+ A4 f4 W' n% L
- g.setComposite(AlphaComposite.SrcOver.derive(value));" h i. W, M4 r8 i' V. J) `: V
- }
复制代码 9 j0 t" D- \& T* O6 j
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。2 h3 D8 c6 R K# H2 r9 b' e E
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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)! S# [4 s- t8 u3 S
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