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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。
# D/ i0 F8 N3 T/ ?+ T- importPackage (java.lang);3 G/ `) v- o$ U, E# P: K, u
- importPackage (java.awt);, w3 a6 r' P z; S
7 s9 K- O# M) _% ~, m1 k- include(Resources.id("mtrsteamloco:library/code/face.js"));
% _" W& @% x+ L9 x# R
& z; B. m$ w5 R* J$ @) F- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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- function getW(str, font) {
, I& M0 E& X9 Y8 w - let frc = Resources.getFontRenderContext();
5 F: [! `. b/ `& Z9 T/ e - bounds = font.getStringBounds(str, frc);: G6 K( p! N& |7 d) H
- return Math.ceil(bounds.getWidth());. r# {( E8 u2 j2 |7 |3 A: q, c
- }
# Y" Z/ E% A6 l
o: d$ C) ^8 e6 r- da = (g) => {//底图绘制
7 m1 t0 h; l. G+ \& B. D - g.setColor(Color.BLACK);. j! n4 `# c# @
- g.fillRect(0, 0, 400, 400);
2 Z- A2 i1 U2 Y- j) Q$ [ - }
2 h* z+ T: ]& X) i# _
5 E0 |& B4 t: X# J7 l- db = (g) => {//上层绘制
; l. c9 h7 }4 ~7 }$ X. f - g.setColor(Color.WHITE);3 Y6 f3 B& d& h2 A" V2 w" R" ~
- g.fillRect(0, 0, 400, 400);
4 I) G7 g# V5 t6 s" p' [7 i - g.setColor(Color.RED);( J+ \% a0 J4 h
- g.setFont(font0);
& J/ @1 N6 ~! @4 k+ J7 @! Q7 w" u - let str = "晴纱是男娘";
I0 }: h w9 @+ e! |, w+ S8 q - let ww = 400;+ A U8 ^ b* @1 k
- let w = getW(str, font0);& Q/ v& j8 L4 n* w
- g.drawString(str, ww / 2 - w / 2, 200);& O8 {$ Q- q. W2 g; [5 D s
- }, T4 o& E# y# a/ _" c2 V
Y, Z' v9 B" f# |- const mat = new Matrices();
0 |6 B! L: e% r$ g - mat.translate(0, 0.5, 0);# j t' _! u5 s! z8 _
- - t2 f9 ~1 r$ P8 j* L
- function create(ctx, state, entity) {) L% s8 w; ?9 F
- let info = {! v. V( J) s; @+ ^" J
- ctx: ctx,1 v/ C! V# S; p2 n0 y" `# t& H
- isTrain: false,: ? f; |0 r# K, w/ U
- matrices: [mat],( m3 \+ C4 ]3 C, p
- texture: [400, 400],1 C2 A+ X* M6 u9 v
- model: {
; u. v \9 Y. t' r* r - renderType: "light",
E0 Z3 G, I0 F, e- F1 S - size: [1, 1],
5 E6 T: m: q* U! q# v# i* B - uvSize: [1, 1]' d2 n/ w) }$ u3 b( w8 X$ ^
- }0 Q3 Y9 ]/ \4 r- Z
- }
0 @$ t4 s$ T. U$ s1 _. x - let f = new Face(info);
. L/ P& K- F6 O - state.f = f;; K5 L) @0 `" q- v5 c
- ) @" T+ v7 \7 a6 R
- let t = f.texture;: n6 Y! U# _5 x( b2 h/ `4 Q
- let g = t.graphics;3 j/ j Q: C& b7 \1 L5 Y
- state.running = true;4 @% n. u- M2 {: U0 U9 G
- let fps = 24;
; }" `) a# V7 T! T+ ^) o - da(g);//绘制底图
6 e/ ]4 @/ i$ d& k - t.upload();
7 r' ^ z9 F8 t% _% p - let k = 0;
" ^! A# ^' ^' i6 m+ `/ j - let ti = Date.now();7 ?& T- h- \5 a+ l
- let rt = 0;
/ L2 b8 V+ S5 U - smooth = (k, v) => {// 平滑变化
: Z7 E" y4 n% E6 G* n; i3 Q; q/ k - if (v > k) return k;7 U. L5 L5 V$ s) o3 R7 g6 z
- if (k < 0) return 0;
; k8 ?; Q: d* S3 i1 e' l, p - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
- g. L! e: M/ H% l& W - }
- ^9 u0 ?2 J3 U G1 n - run = () => {// 新线程
2 {: y# r b5 _ - let id = Thread.currentThread().getId();8 r! j0 Q6 M( D# J
- print("Thread start:" + id);! `/ J0 t: _0 M4 F T i! e. x
- while (state.running) {5 J: P. ^/ Z6 K+ o) A
- try {5 Q g) S. h& R6 V/ Z( {
- k += (Date.now() - ti) / 1000 * 0.2;
2 f) S6 o1 N1 u: p$ |' ~ - ti = Date.now();
+ a3 ~4 v9 j! o- t+ H - if (k > 1.5) {
/ k5 U& l" B. |. a+ V - k = 0; @) g& a- c, J
- }
4 R% X2 K% u4 } - setComp(g, 1);
g" G! z* T2 \$ F9 T, `- m - da(g);( s' v" T! h2 Q3 B& r
- let kk = smooth(1, k);//平滑切换透明度" I* ~& v% N" l6 ^1 L
- setComp(g, kk);
( l' w! e+ [- V- s* s - db(g);
9 c& V# p O1 j& k - t.upload();5 \" t6 l% s- m$ m6 K9 I
- ctx.setDebugInfo("rt" ,Date.now() - ti);3 a- Z: w. b, K- r% l" o! {% R0 i
- ctx.setDebugInfo("k", k);
" K7 E0 i3 b7 n# k2 f+ }) v4 m8 K - ctx.setDebugInfo("sm", kk);6 l1 M8 H! g$ X; E* E9 w' f
- rt = Date.now() - ti;
% w; p6 q0 d( l1 V - Thread.sleep(ck(rt - 1000 / fps));
0 j6 E: ^9 @2 H+ H/ j - ctx.setDebugInfo("error", 0)7 P/ w* A" Q* s- |* y
- } catch (e) {. W; [$ z! A, H% M m& z, M1 Y
- ctx.setDebugInfo("error", e);
4 k; X! w& v0 } O - } M8 X: F. K/ t# b* K
- }
5 E8 A( U y% _; b8 d/ l - print("Thread end:" + id);3 Q& \1 }8 X' b& R& A4 L- y
- }9 I/ s) n C$ }+ o
- let th = new Thread(run, "qiehuan");
* v: g# n6 e$ d# ]3 s0 O' r - th.start();
, W" h' v& G7 I4 m, l - }
8 q& h; ^2 |1 P$ s) W5 w - * f6 p( r. q9 Z0 e) d
- function render(ctx, state, entity) {
) B1 d& x, a6 K ?* \5 d - state.f.tick();
9 v3 s5 U1 @" C; Y; o - }
% ?; ^1 D2 i6 d" l& f- O: z4 l3 f! w - # L5 Q$ n: ` g" D8 d
- function dispose(ctx, state, entity) {
* }! d& S S& F. d5 ^ - print("Dispose");" t! ~' k% H2 i7 M6 h) N( U
- state.running = false;! G- L7 P$ A- ?4 y' Q( l
- state.f.close();
3 _6 z" N$ K! x1 n - }- ?# F, V% L& ]0 x% a7 M) w& t
5 y- R$ U" {3 ?- x6 d7 L1 r- function setComp(g, value) {/ H) O2 r6 U% N: M. T5 m$ r2 F
- g.setComposite(AlphaComposite.SrcOver.derive(value));
2 D$ j4 L2 s$ N: s, C: Y$ C9 F5 }, J - }
复制代码
# [) ^, Y2 K. Q. [2 G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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( x1 Y6 `1 {# l3 |3 P5 t顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)4 }4 g9 `& u+ Q
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