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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。
0 M$ w0 J8 Y5 s& A& X' p" q# s( ^- importPackage (java.lang);: J7 N5 |+ R3 c% v( Q
- importPackage (java.awt);
; ?9 C: [8 f# |
3 g) g0 Y% g8 z0 \- include(Resources.id("mtrsteamloco:library/code/face.js"));
+ X# Y* z/ t1 u# S" C* F
. {5 Q+ d2 c: }- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80); l: L" t6 ^6 ]
- P. P: n6 m! g% X0 F
- function getW(str, font) {
; ^5 X) O4 O0 p+ c3 N* [ - let frc = Resources.getFontRenderContext();
: ^# c, o8 C% ^% Z( @7 m - bounds = font.getStringBounds(str, frc);
5 D( h6 c. S3 E* u9 l r - return Math.ceil(bounds.getWidth());$ |9 R% ~4 Z g7 x7 q
- }2 m2 ^# |0 W1 J* r6 n
3 A" I$ Z7 ?: S: B( ~1 C. Z- da = (g) => {//底图绘制3 R( q* d! I4 |; e) K" S+ B5 b
- g.setColor(Color.BLACK);
& b% j" Z3 f- o2 X' k6 x! C/ O6 d - g.fillRect(0, 0, 400, 400);
9 q- i% p+ m! d' M/ S: O: G; v" p% o - }
n; Y X0 \ O; y: Z - 7 f! m4 y& N% H: _1 B
- db = (g) => {//上层绘制% [+ i% o# w8 P8 A" {
- g.setColor(Color.WHITE);, `1 e3 Z/ G6 K! @
- g.fillRect(0, 0, 400, 400);
" p# m. p8 n9 X - g.setColor(Color.RED);
# y- _% V3 M3 w, B( ~6 U' k - g.setFont(font0);7 Y$ Z% K7 d- H, E
- let str = "晴纱是男娘";
9 j& j8 y; {& I1 E6 C6 r. e - let ww = 400;9 s# I* k5 p, }" ^& y3 Z7 b
- let w = getW(str, font0);( m' d+ K! j; h
- g.drawString(str, ww / 2 - w / 2, 200);1 z; t; {; U$ K8 f4 M/ v+ G$ P
- }/ ^/ N! ]( d/ Q& T3 O4 T
$ l" c4 k! `0 h0 j* @- const mat = new Matrices();
% A2 G* [- N$ Y, c: l. ` - mat.translate(0, 0.5, 0); N3 R2 b" m; Q. ~& @6 G& Q1 k/ `
- ! X# y3 K, Z4 t M1 W
- function create(ctx, state, entity) {
! v) o3 @" |3 E0 W$ T - let info = {3 g. q. u& h0 s$ b% d, d
- ctx: ctx,
: ]5 Q( X) [8 o2 N& b - isTrain: false,
' b6 Y7 F6 y! x9 Z2 W6 e/ [ - matrices: [mat],: h8 h- }1 J: O+ e7 z
- texture: [400, 400],
. E# I$ }, p; X7 }8 X' p - model: {
' B+ E8 `2 H) I# B; N6 L" b+ n- M - renderType: "light",, t) }# }7 U- Y% n( ]
- size: [1, 1],3 C) U# D+ H9 \2 _! `/ X& D
- uvSize: [1, 1]
) s- M$ p/ i. X& `( G$ q - }
4 p3 \; f/ e& M u4 h3 U - }
1 B& {% H4 B( Q8 l* D4 i3 j! {5 e - let f = new Face(info);
: T( q& X. K: K, N! J - state.f = f;
0 ]8 l4 }1 ~% `$ u. { - M+ f/ l e4 D$ o! A3 q. S
- let t = f.texture;' j2 }' M- Z E. y' u2 ~! g1 c$ R' H6 Q
- let g = t.graphics;
7 W! d' O2 i" Z - state.running = true;
; M: v+ t! o4 I3 K: x4 R. K6 { - let fps = 24; X! F/ d) i. V
- da(g);//绘制底图: A5 L: C6 x/ ? y) }7 h
- t.upload();# } _5 R0 V' p% z$ ~3 O
- let k = 0;
5 C2 A/ q9 ^ p, `+ }1 V - let ti = Date.now();) a3 U( ^! U* N/ t7 V1 E
- let rt = 0; z/ ] l5 G a6 l. m" R% z8 m
- smooth = (k, v) => {// 平滑变化
% M- W. [8 T+ `) ` - if (v > k) return k;: f0 Y% H( O# D1 [8 d
- if (k < 0) return 0;
1 I/ H9 H, {* K% q. d1 i' j. m - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
) d# M3 `9 b' v! N$ Y8 S1 u+ |4 m - }
$ u8 e: }4 y4 D# f# k - run = () => {// 新线程
v% j, |& L% Y- S, h2 b - let id = Thread.currentThread().getId();; s2 ~3 b* j, ?! x0 J! u9 l0 T
- print("Thread start:" + id);( m/ p& \2 \, ]' d8 d( d0 Q4 ^
- while (state.running) {" K0 c+ m5 d+ ^ R- |# ^( y2 Y2 U
- try {4 F) } \9 [( {# z% Z% b, J8 a; h5 R. M
- k += (Date.now() - ti) / 1000 * 0.2;2 H0 q% u8 _6 c9 D# @ _
- ti = Date.now();6 L% R4 k/ X3 F) g* c/ h
- if (k > 1.5) {
# G' g, `, y4 \9 v( |, w - k = 0;5 W/ Y$ m1 h C: V
- }
7 m& p* j1 H# r - setComp(g, 1);
+ A2 ]) |3 N$ w) Q - da(g);
, }% ^8 ~# {9 s: z+ s! K - let kk = smooth(1, k);//平滑切换透明度
& [2 l6 P- P& B4 |2 e - setComp(g, kk);
- S4 s& s% i5 c7 V. U - db(g);4 E, Z0 L1 Y7 F
- t.upload();
" k( w' T8 ^9 x! J8 F5 W - ctx.setDebugInfo("rt" ,Date.now() - ti);, E) o4 Q% J2 ] u1 G# z, j X& _
- ctx.setDebugInfo("k", k);
" m# w7 r$ K3 ~4 j0 }- Q - ctx.setDebugInfo("sm", kk);; W8 G- G( h9 C$ Z7 q3 g! w
- rt = Date.now() - ti;
% c# i; S1 m' A8 f6 l - Thread.sleep(ck(rt - 1000 / fps));
6 O! S+ J* Y, }* Y& \ - ctx.setDebugInfo("error", 0)
4 ? }9 x+ d6 c0 k( m' H# b - } catch (e) {
' P- T1 u9 f1 G) s+ J$ b: p8 o - ctx.setDebugInfo("error", e);
! O* T% M. C( L4 f - }" `$ @! N" ]0 v/ Z7 ^; k
- }
* ^) a4 W s& r. v# t. e! S! E( h - print("Thread end:" + id);
, q6 ?/ i, U$ x X8 j* I* I - }
) X( s8 ~6 A0 J E( Q( S6 ^( r1 g. @ - let th = new Thread(run, "qiehuan");. S2 A: ?: _6 n
- th.start();
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2 ^+ y% \7 }" N% Z$ _/ \$ P! j- d- function render(ctx, state, entity) {
0 _; l1 `9 I' H; X8 s, o3 H* h - state.f.tick();7 V2 E( |: |- L
- }" r C* t: N2 P" m
/ r- I3 c7 ^+ b3 W- function dispose(ctx, state, entity) { e7 C) F1 M% f* g
- print("Dispose");$ P( [* R% x! w$ U2 d j) d W8 d0 m
- state.running = false;! o9 H5 H6 b: f2 Z f
- state.f.close();* [. v2 R9 b" x E6 X$ I
- }) F. z( G2 g2 f
- / h W: m9 j8 C& o- C9 K$ y) X5 x
- function setComp(g, value) {
6 i, I4 w) ^; S: D2 G/ C7 Y( h" B - g.setComposite(AlphaComposite.SrcOver.derive(value));
/ }8 {0 f; q9 M6 ?! Q# U - }
复制代码 f0 I2 d u3 m4 L% Z7 J# W
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)/ f6 j0 `1 U2 Y$ H. `0 S; M
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