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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。
' g& `& _4 g& h. ]' k" T- importPackage (java.lang);
( `$ [& G9 h( n' M: v+ Y - importPackage (java.awt);, ~4 ]& {# Z9 j2 N& ~- q4 F
- 1 P5 E% u. Y( @2 l
- include(Resources.id("mtrsteamloco:library/code/face.js"));) o% p4 A* d5 K: V4 ]( b: J' i2 N; O
5 O6 i5 j7 F; ^- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);1 Z, J. X3 e8 h$ w. r. ` f2 u
2 H( {( ]2 W( Y7 {- function getW(str, font) {& P' F% t" I# c1 y
- let frc = Resources.getFontRenderContext();
7 B, Z5 B# e* s$ ^$ J - bounds = font.getStringBounds(str, frc);+ r, c# K# n4 m r: s3 ^
- return Math.ceil(bounds.getWidth());9 j& l. |4 G+ c3 [4 H+ t- m* w
- }
2 m, K' ]- b) [% `, K, Q
" o5 A3 J- D& U% W/ q+ ~/ C- da = (g) => {//底图绘制
( `! }, `% V4 O; V - g.setColor(Color.BLACK);
& Q4 [8 q! U' W' O8 L - g.fillRect(0, 0, 400, 400);) C' U$ H: Z4 ~/ k
- }
# I5 l" p$ N6 Z6 x1 b( `0 r! ]) K
- s8 B6 s) ]1 ~ K- db = (g) => {//上层绘制% E5 ^8 {8 V( J, M N
- g.setColor(Color.WHITE);5 A3 X' i* Z9 I' p5 O0 u
- g.fillRect(0, 0, 400, 400);
7 d2 V( k5 s; ?& v - g.setColor(Color.RED);
$ u7 {1 h' B6 y0 E: I" d( W - g.setFont(font0);7 @$ w. r+ X' x* B. C) n& Z5 [# Z
- let str = "晴纱是男娘";
& x6 Q$ t4 \( N- i( w. j& h - let ww = 400;
! E8 P, Y. b2 T$ V# k5 S - let w = getW(str, font0);, x( g) J% ^2 E$ V/ D% l
- g.drawString(str, ww / 2 - w / 2, 200);2 y1 G" R3 P+ g+ ]
- }
$ ?1 O& l7 P: M, a1 v, r
( }% m4 m* u& f" u+ l( u0 X& r8 F- const mat = new Matrices();- q* p) N" L2 H; V0 |( {0 z* ^4 |
- mat.translate(0, 0.5, 0);
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: ^4 X+ l3 n9 V7 S- function create(ctx, state, entity) {
$ J! x3 r/ \/ X - let info = {
1 ^# Q7 a3 ]4 \: W3 _# d' [4 E% s - ctx: ctx,
: i8 d: d6 S Z1 ]1 B( \2 S - isTrain: false,
% k0 [1 F, } D - matrices: [mat],
# b+ h) Z5 Q! Q2 { d$ Q - texture: [400, 400],
0 p# T$ _8 a4 M0 s8 A( Z - model: {
/ \8 d2 _3 j; U# C- a - renderType: "light",
4 P/ z) ]% D9 K - size: [1, 1],0 d6 l& P& d2 J9 y: h) f! \4 B; d* z' F
- uvSize: [1, 1]% J6 m# e3 ?8 c9 f1 l
- }) E1 o# Y7 @( |+ ]
- }
, m% |" w# [; }. t% o - let f = new Face(info);
d: W3 a0 z, w& |% ~5 b, G/ f - state.f = f;9 f) a3 u0 O3 V1 `! z( t* s
/ j, Z. o& y6 l9 W' W4 }- let t = f.texture;% U2 r9 R7 P7 k( Z: i) X* C$ a3 T# I
- let g = t.graphics;
0 u6 X: k9 j2 }& s l! l8 H - state.running = true;( \& |' T: o# @3 c( _, D$ Z
- let fps = 24;: ]- n7 d8 S9 U" E9 R
- da(g);//绘制底图2 X `: R) O& g& ?6 D9 J2 S
- t.upload();6 u, g( j- J2 m: y4 o8 j
- let k = 0;
( B. [% L* `# M& A6 x* o - let ti = Date.now();2 z9 \7 N- M3 f8 X5 R
- let rt = 0;
7 n/ I% k0 t( {8 d0 k( ~% n/ w - smooth = (k, v) => {// 平滑变化
& n: G4 y4 `" b6 j* Z( h - if (v > k) return k;- d8 s7 y4 O3 u- F# i( D
- if (k < 0) return 0;! J1 ^4 B% c2 i. Z7 M4 b
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
7 [& F% m: u& S2 x# V6 [: o# a! g - }
4 z$ w+ M& i# p' R- A, D - run = () => {// 新线程8 E/ W, ^: Y [$ W1 o
- let id = Thread.currentThread().getId();
/ G {4 Z4 t z7 I7 t - print("Thread start:" + id);3 v& T7 ]( q$ |. d, R
- while (state.running) {0 i( J1 o$ @$ M1 W# U3 ]% _
- try {
$ H9 M- `) S/ d- b7 i P - k += (Date.now() - ti) / 1000 * 0.2;
6 f V9 T5 T; a8 t; q* T - ti = Date.now();
6 n0 r+ @# x. z9 n" ^ - if (k > 1.5) {
1 b7 N4 v9 ?8 t q& m$ v& c - k = 0;
9 ?" b$ f4 p, m8 d - }& a' Z. ~. R4 E0 S1 c5 {' `+ j! w
- setComp(g, 1);; s7 t# w6 c- K( c
- da(g);4 X! V" d1 l4 G
- let kk = smooth(1, k);//平滑切换透明度
( o: i* x) X# C9 g, ^ - setComp(g, kk);
9 I: V6 T" \& [7 a/ u - db(g);& t V; a/ S3 ?1 `, F4 {- @! e
- t.upload(); K/ {; }( x- g3 j+ N" w
- ctx.setDebugInfo("rt" ,Date.now() - ti);
0 I$ `8 Y/ g2 p; } - ctx.setDebugInfo("k", k);1 Z# y% X3 R5 `/ R) Z
- ctx.setDebugInfo("sm", kk); e3 O6 L" f+ q& C2 _" U
- rt = Date.now() - ti;
: K+ E9 X( K& ^3 q& M# @) A4 M) { - Thread.sleep(ck(rt - 1000 / fps));
- x- O6 B6 @3 V1 X' ^ - ctx.setDebugInfo("error", 0)
+ L& C' T) b! b- N y6 j# ` - } catch (e) {$ I, u j) }9 t: P
- ctx.setDebugInfo("error", e);: R3 W3 I; O: c. o3 B6 _
- }* ^1 ^6 J9 T. U. e) [# |7 p9 o! Q
- }" u5 ` W2 K. j2 s; Z( r
- print("Thread end:" + id);, \3 s( E/ @/ h, ]& d4 g
- }
$ [4 K9 E1 K) E) o. G - let th = new Thread(run, "qiehuan");! r7 J8 a$ c; G6 @
- th.start();
) s& H! x6 R# u' G3 u - }
( f8 U# a# s9 M$ T. m& ]) s - ( d# |# S2 B: {# A8 v: r8 ]
- function render(ctx, state, entity) {' v* m. O$ M* k1 y. Y) N! y7 n' C0 z
- state.f.tick();' e T* M: E- ]% }
- }
: {% v- C3 M* y" u7 i7 R Q/ e$ [
" j, V; w }5 J" ]( @# J4 I- function dispose(ctx, state, entity) {8 ?1 h: u9 h9 ~% ^4 b% A
- print("Dispose");
9 V7 ^0 S0 H. b5 l+ I! g( W - state.running = false;. A: f6 \( V2 C4 G( W- h) N# f0 J5 L
- state.f.close();
. F) `8 R/ E6 B: O; | - }
9 ?; m5 H7 D0 @; H2 Z
" R: C# k) a2 E$ H* r" J+ N- N- function setComp(g, value) {' ? t6 E: f7 |- w, U) }+ r
- g.setComposite(AlphaComposite.SrcOver.derive(value));
9 D9 v1 g s+ o3 Q% k - }
复制代码
" `0 _: O4 w0 i6 \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。9 j+ s' a8 e; I4 l6 w' V1 d: Z
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8 x* d9 M a% f j# k6 k$ m顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下); a1 y1 R& f8 Z3 b* S! U
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