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# U0 U. {0 V% r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。
8 p" w1 y( O# `$ ?. R- importPackage (java.lang);3 i# }$ [7 r& h x! Y9 Z: I; x* b
- importPackage (java.awt);4 [$ r8 O& l0 d9 B9 E9 j
- ' U, t' A( l" e. n* d4 e
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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5 d0 d# I, V+ Y4 h- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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- function getW(str, font) {
9 h& x; k# y1 I" ^# u - let frc = Resources.getFontRenderContext();6 V! y: C2 r# }# O
- bounds = font.getStringBounds(str, frc);. `; ^- S' X5 Z. T. z1 ?/ H
- return Math.ceil(bounds.getWidth());& l4 F" T# N6 W1 M" a
- }% f3 v! l7 K! a7 x4 R2 I3 T
- ' R9 G( b: u) N" O0 E6 u F
- da = (g) => {//底图绘制
4 F( y7 @, \1 y - g.setColor(Color.BLACK);
3 G; u9 j/ `% Q7 K! d - g.fillRect(0, 0, 400, 400);
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- 6 _% F8 {) ?& f e n
- db = (g) => {//上层绘制8 H/ S/ v# ]: M: _
- g.setColor(Color.WHITE);2 u( C+ j, y' h& f; |* Z
- g.fillRect(0, 0, 400, 400);
' E& O/ I* N8 m! p/ U - g.setColor(Color.RED);' x; e/ t! V9 Y8 @# x
- g.setFont(font0);! z4 m2 |$ h; t8 ?8 g9 P, R8 N
- let str = "晴纱是男娘";
! M- d+ U) @$ B# U5 I# R& s - let ww = 400;) e N6 {' S- V2 ]8 G0 B! r& b
- let w = getW(str, font0);
8 I$ h' u" y* z& N' T; c5 s: D - g.drawString(str, ww / 2 - w / 2, 200);
( l1 H9 W( J: f: q - }
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6 M, L- H* d7 P8 w- const mat = new Matrices();
1 j# \. K7 |9 }0 T4 a2 \0 Z v - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {
% l; a; C# D6 I, D& H% y - let info = {$ O+ h- m; ]4 ]( G( E
- ctx: ctx,+ ~) a0 t; x G
- isTrain: false,3 [! g" B* r. J0 s
- matrices: [mat],7 X2 J# u) d0 L, G' t+ B
- texture: [400, 400],
8 B- S% |1 I0 c2 L; E& V - model: {
5 v. x, @8 N p* [: ~ - renderType: "light",- `8 h' s3 R ~! E8 m+ d
- size: [1, 1],: p O# j r) l# k5 R1 i- y
- uvSize: [1, 1]$ ]- `" V- X/ Q9 v" d8 p
- }
) }& }( M; D0 A+ j; u, K - }
! S7 d2 \) @/ ]. S; D; S7 F - let f = new Face(info);+ O) Z. X2 r" m/ ?% L
- state.f = f;& i a2 r7 c7 h% P: G7 |5 i0 L: F B
1 Z: f* I5 l. b4 r: ]7 }0 v+ B- let t = f.texture;
# L6 B8 v z ? - let g = t.graphics;
4 w. v' }$ x# H# L - state.running = true;1 N! O5 S) x0 G) I
- let fps = 24;) R8 j) {: S- Q( S, [# S
- da(g);//绘制底图% h; r W* |! ?
- t.upload();3 f" \. x p n i
- let k = 0;. n: [9 i+ G" ?7 a
- let ti = Date.now();
: L! `$ V1 x9 @' N$ F, q - let rt = 0;
2 u4 N" s, D7 j8 S - smooth = (k, v) => {// 平滑变化
2 ^5 G6 |: n% `( h( P2 M1 N - if (v > k) return k;
8 u7 A$ ~8 g% }' M; g' V9 d - if (k < 0) return 0;% I* ?, @, o* Z. R; Z% N
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
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- run = () => {// 新线程" i7 w1 Z0 A. ]9 [
- let id = Thread.currentThread().getId();( y O$ l. ^7 o+ y. F( H* b/ N
- print("Thread start:" + id);
3 A" ^8 D' J8 k$ L - while (state.running) {
" k5 ]5 F% G; M! k+ L: u - try {
( G8 J* [4 W7 L- O( ]; z& Y - k += (Date.now() - ti) / 1000 * 0.2;9 o0 k- a0 R4 U* A
- ti = Date.now();$ ?, y8 a( [3 ? {: B( D
- if (k > 1.5) {: p) r( S! q; g2 x9 ~; ^3 r# E" ~
- k = 0;8 v$ ?& q! w: U
- }5 O5 c0 ~' T7 Y' A* Q! q
- setComp(g, 1);
4 x1 @( D, g) C' d' M/ _0 j9 G - da(g);
8 i+ F" T7 m w; {' A - let kk = smooth(1, k);//平滑切换透明度+ N x1 m9 ~0 V# r
- setComp(g, kk);9 [8 k+ c4 K7 R% W
- db(g);
7 F$ ^& K9 o/ H - t.upload();
/ P1 G1 I0 [3 i3 l) |$ R! `4 _! c - ctx.setDebugInfo("rt" ,Date.now() - ti);! C; m; A/ E+ z
- ctx.setDebugInfo("k", k);
) R+ A$ E, r4 D- O) b - ctx.setDebugInfo("sm", kk);2 n$ R( X% Y. Y8 h8 p
- rt = Date.now() - ti;
( k4 k6 _6 W& Z9 I" ~+ x - Thread.sleep(ck(rt - 1000 / fps));- S6 D; M; C& a- z
- ctx.setDebugInfo("error", 0)* \3 s& h! e8 [) t" T; r
- } catch (e) {
! ^) T" A' X, E, u/ o - ctx.setDebugInfo("error", e);- q4 i0 u' ~0 [& i u* o& Z
- }
- V5 G% p" H6 H G - }. `6 I" v; d) E! P4 U3 g
- print("Thread end:" + id); e/ {* R, ]/ F: w0 l5 y0 G
- }
* f! X) Z$ E" v0 n) i - let th = new Thread(run, "qiehuan");+ ~! h/ H g) b. _9 D; T
- th.start();4 E7 [6 \2 B" ~) Q2 L4 X
- }
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) T, q g1 a t- i- function render(ctx, state, entity) {
8 N( p; n) r4 {+ r; k$ Y - state.f.tick();
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/ L0 B; R) Y4 P& T$ @$ [- function dispose(ctx, state, entity) {
& h+ D; i9 G7 A, D% O4 Y, e - print("Dispose");
# G N7 l8 K! w2 g9 Q7 a; \- F( |- H - state.running = false;; j2 x6 P' ]7 }* i1 b/ f
- state.f.close();. H5 h g1 S- ^1 a# c: Y
- }6 z& n4 i. a) Z, e& t; P+ G
- Q/ t; }2 _" H! Q- function setComp(g, value) {( [. R: v4 y% d8 A8 Q, H: i
- g.setComposite(AlphaComposite.SrcOver.derive(value));( z3 ]3 A# _% I' j- x6 Y: \
- }
复制代码 * a# o: f5 J. M
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); s0 q) O5 X1 D/ d" ^' Z$ Y
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