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# c4 d. l9 Z; T% H% z1 _$ X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。
: F( U/ e8 N, v, b; |" V- importPackage (java.lang);
% K Q! v) ]8 P1 @6 O. s4 M7 t - importPackage (java.awt);
8 R. E$ V9 A- ?' i9 X - / f$ y7 s( F6 ]/ l
- include(Resources.id("mtrsteamloco:library/code/face.js")); d) ^2 p; G4 Y% c' V% U/ g$ J
7 K1 g. X9 I* o! d6 r+ d9 [ @- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
6 b* l! [- ~, e. _# W4 m/ k/ @/ a9 I - " w/ y0 \: i) T" D$ E' S% ~2 B
- function getW(str, font) {
5 c' B- U0 w8 n' ~. H - let frc = Resources.getFontRenderContext();- ?0 J1 }% b& l9 i) q
- bounds = font.getStringBounds(str, frc);9 [. M7 ?5 U0 q2 `( X1 E8 I+ _
- return Math.ceil(bounds.getWidth());
0 l4 R( Q/ t9 M) u0 t+ B - }. s7 L$ d1 v5 A# C- V
- 0 {# A" H! X) ~( X1 z2 V( R
- da = (g) => {//底图绘制
m" |: v3 {& _% B2 O: Y" H" c: r - g.setColor(Color.BLACK);
. C( y# ?) ~( _3 {3 f* ^5 K9 y8 \ - g.fillRect(0, 0, 400, 400);
) W! h3 F8 g3 v7 \ - }
' q( f, }/ n! x: M - : {" T" W2 S: [$ G5 _
- db = (g) => {//上层绘制 E* b# ^- B+ `& j# X
- g.setColor(Color.WHITE);$ E! Z4 e8 H2 B4 j/ k1 a
- g.fillRect(0, 0, 400, 400);
% s6 |9 k! C/ ?# s - g.setColor(Color.RED);- w% R/ J% M" G/ s$ I: D* {
- g.setFont(font0);
- \! Y: h* `* N6 Z# k! F) T: ^ - let str = "晴纱是男娘";
) c4 o) w- F* W8 _0 y - let ww = 400;# m! @4 W3 t, H9 \. ~' M
- let w = getW(str, font0);( |( r; N' \+ K4 W" Q/ t6 x. {8 p
- g.drawString(str, ww / 2 - w / 2, 200);
0 q, e3 N0 T$ v4 ?0 L - }
2 h9 e- W% k( D+ I' m
: L8 ?0 y0 m, ?8 S- const mat = new Matrices();2 ^7 ~* ^# _7 ~
- mat.translate(0, 0.5, 0);: G' V p/ y; \/ C- S5 j ^- o! i5 x8 U
- / E# V' m8 S/ |1 M
- function create(ctx, state, entity) {) r& A+ l1 M1 ?' ], o- W2 i
- let info = {5 x6 P3 R, n0 N* N3 z7 H, Y
- ctx: ctx,( Z: U( U1 I) c! [* z
- isTrain: false,
) _! @+ B4 [! o6 o+ {+ ]* r - matrices: [mat],
* q0 L* R* z* l) }: R% D - texture: [400, 400],3 Z9 f' D# _8 q! H( E% b9 z. k
- model: {$ D7 M: b [2 U: U: ]
- renderType: "light",7 a @& s) e/ e7 C
- size: [1, 1],
) p/ E3 v& E: f0 \% q, H' X7 Q! ?1 f - uvSize: [1, 1]/ L- A6 Z5 i: X7 Y
- }
+ d) P4 p4 S4 J - }
" O' T2 H: f: l - let f = new Face(info);# ~5 {, w+ U' r+ l
- state.f = f;* A: p6 e8 K* \) f% V
# Q1 o0 I; \( f- let t = f.texture;3 `$ c7 R. b$ L# p; y
- let g = t.graphics;8 V S9 k2 j0 `) Y
- state.running = true;
* {1 c4 \+ u0 D4 B - let fps = 24;7 }* B( V. q% k. h
- da(g);//绘制底图
7 ~) a+ z5 k& S; s5 p+ o - t.upload();- t2 E7 C! \ A0 j% ?4 E |
- let k = 0;7 s. ?5 Q# y- ]" S
- let ti = Date.now();
" W' I+ f L; N9 C i. r3 F - let rt = 0;
' n* {: B$ {$ } - smooth = (k, v) => {// 平滑变化+ F0 e% C; F( g2 K) r- J
- if (v > k) return k;
- e$ F# w+ G, ] - if (k < 0) return 0;
! Q$ i0 S0 _: l - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;1 C( K: S& W9 x1 v1 `
- }$ ?& t) I/ m% Y
- run = () => {// 新线程
& t9 H' C6 R& d, } f1 U' u - let id = Thread.currentThread().getId();
% h: g( m$ M3 [9 e - print("Thread start:" + id);
8 c" o- D: d7 Z' \3 f - while (state.running) {) B# u2 y9 ?. _5 \# P
- try {
. ~# ~6 ` g2 A9 @! u - k += (Date.now() - ti) / 1000 * 0.2;
, |5 j `* j* R& z8 ~ - ti = Date.now();
5 o z% `. T- d) h9 f - if (k > 1.5) {
! x' o' m) g6 u3 [: R/ S; i# b - k = 0;
1 J7 v1 c( w: y$ [' L6 `/ Z - }
3 \: N Z/ X* R' t! z | - setComp(g, 1);5 n- V4 D! ?$ y) \5 F8 N& j' \+ ]
- da(g);
9 k3 }0 T; f# i3 @: c; V: ? - let kk = smooth(1, k);//平滑切换透明度6 h& [+ @ ~8 b/ m G3 T
- setComp(g, kk);' F& T* @* E7 j7 s& T
- db(g);4 F9 x9 d9 h0 N' k
- t.upload();
' K9 m. m' A* b+ m- D8 _ - ctx.setDebugInfo("rt" ,Date.now() - ti);, W) n8 w; e, I/ s( l; ]
- ctx.setDebugInfo("k", k);- D: {1 y6 B% T6 ^5 a7 K! r
- ctx.setDebugInfo("sm", kk);
" _. F5 v# i1 ^! R0 ] - rt = Date.now() - ti;
0 ?/ v, ~$ c$ f - Thread.sleep(ck(rt - 1000 / fps));* X/ t5 r' x% y1 s; m
- ctx.setDebugInfo("error", 0)
) m r2 y( Z3 y7 n - } catch (e) {3 ~* h* r' `/ h# j$ f8 P! @* _6 F2 B" F
- ctx.setDebugInfo("error", e);0 x/ Q3 Z& P4 M& P9 \. M t
- }
3 F3 [1 l$ o" d& i0 Y - }
& {) d1 `! Z5 ~! ]: f - print("Thread end:" + id);
& Y( J5 B6 ] m! s+ g - }
; f4 |! t6 ?( @) E# Z, \2 m - let th = new Thread(run, "qiehuan");8 r' e- Q% _% `6 \3 ^$ \5 @
- th.start();8 H# n$ E" T) |, ~# g* A8 A/ y
- }) S2 e% w3 @" J+ C
- / D) m2 T9 Z6 _5 j* x( Y
- function render(ctx, state, entity) {$ q6 ] [ P* V$ e) e
- state.f.tick();
7 i; c- v" @4 u - } J- c8 K0 b; O' Z0 D& u3 _. c# ^4 C
- 5 W6 \- K7 d( X( g: Q) r
- function dispose(ctx, state, entity) {
; Y0 W- x: n% f, [2 S8 [ - print("Dispose");
5 Y, Z" ~1 X/ O3 c* E( U - state.running = false;! T, d3 a( |' @. `. j! Q$ m. H
- state.f.close();9 d, J$ ^& k* ?* W* K* s) C
- }
% ?2 |2 r6 P+ e- b# D8 d- s2 k - 4 O, I# G0 m/ D! g; Q- _6 w3 P3 B
- function setComp(g, value) {5 d4 i6 {6 y: T8 j* w
- g.setComposite(AlphaComposite.SrcOver.derive(value));9 \6 q$ O! y- I3 @9 R, P
- }
复制代码
& ?5 l# f1 _6 {" J- p* ]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 O' k& I! j) f2 l/ J! @6 _- k- \3 h- I# L
& l9 ~2 g" j& ^! F顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)/ c' \: Y$ U; w8 p6 G) j
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