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5 T' X! q- m, Q9 y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。
4 q# g1 @1 s7 U* O0 H/ m$ t- importPackage (java.lang);4 @- w" ^" Y. T) l/ O9 [/ {
- importPackage (java.awt);5 f7 p( y0 N' y
* I0 V8 [' w* ^+ F: W) M, V- include(Resources.id("mtrsteamloco:library/code/face.js"));
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2 |+ n% O0 F1 \3 t0 W, G- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);. f/ I$ ]/ }% j
0 F9 s+ h% R/ L6 H% C" `- function getW(str, font) {' i" s: t( I2 o3 B N8 v
- let frc = Resources.getFontRenderContext();) ~8 W8 o0 r/ h+ V& Z0 {
- bounds = font.getStringBounds(str, frc); Y+ M8 p. `; ?
- return Math.ceil(bounds.getWidth());
, q* z& w0 b4 Z' f% o v - }
$ @ Z0 y* @0 P - 2 F; M$ ]9 O9 @( |4 `
- da = (g) => {//底图绘制
- w' C1 L4 K3 ], F - g.setColor(Color.BLACK);
5 _ u, O2 F/ S% s$ m - g.fillRect(0, 0, 400, 400);
1 |. r* }4 ~* _& S1 n. c8 ~ - }
, O, b; t# B$ E0 @ H3 z - 2 J# g5 h; @, V
- db = (g) => {//上层绘制' H; U3 O: k+ \3 u
- g.setColor(Color.WHITE);' W, p! K5 k0 T' _) `1 k4 o
- g.fillRect(0, 0, 400, 400);( G9 `8 a& a2 g+ L7 i9 `
- g.setColor(Color.RED);& j2 g2 M* X) z
- g.setFont(font0);
! O9 a1 ~, M4 ?) K8 Y2 D - let str = "晴纱是男娘";# S# o2 F% V. P9 }8 R- d/ x
- let ww = 400;
7 O/ T! d4 V! L8 _ - let w = getW(str, font0);
$ \- \' m: _1 R7 Z I: C - g.drawString(str, ww / 2 - w / 2, 200);- P( ] A+ |0 A1 |1 j& ~" ^
- }
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3 U' F, m8 F. j/ }0 d- const mat = new Matrices();
: D8 _7 E) H8 d. z m - mat.translate(0, 0.5, 0);0 v3 c2 x; i+ |
- + M' T- S5 D% X. x6 ^3 ^: p8 k& B
- function create(ctx, state, entity) {
, v8 |: w: V8 ~0 P! @7 h, O3 I4 r2 N - let info = {
U7 R# e$ A5 z! M' m0 D0 O, W - ctx: ctx,
, r6 b5 @2 _0 L. A: I0 F - isTrain: false,
+ a6 V7 ^ d* V' j - matrices: [mat],' E. m& t0 d1 R' ?
- texture: [400, 400],. ^2 H! D& j( p, p
- model: {
3 C! c& c+ h0 I. P. s$ u# J v - renderType: "light",9 O" Z- h+ T, C
- size: [1, 1],
! Q0 [7 y1 _! Q$ [' W( g - uvSize: [1, 1]
! D0 W3 k) c, ~3 k - }
: h: X2 j9 T& ?1 o9 v" g$ U( @5 u' ], ^ - }) T2 x, x; x7 E* V- s
- let f = new Face(info);$ N! k( Z( J0 x0 c* F/ {! l
- state.f = f;9 h- _' s, H7 A$ u& D$ E8 D+ ?
3 m( ^% p* w; L5 \3 G' x( x7 E. E- let t = f.texture;
: [9 [: |7 O2 }+ ^% @& ?3 ^ - let g = t.graphics;
8 @% |& j) h; \. J, ~8 k& A9 m6 H - state.running = true;$ l& O, a! w$ S: T% h
- let fps = 24;3 p7 @! b4 L4 K: `4 a
- da(g);//绘制底图/ z+ C7 M9 s( u. V2 m
- t.upload();: g2 z7 Q4 p3 p) ]: p* h+ S* Y2 p
- let k = 0;8 ~8 i/ ~5 M1 y; |, }# w: B
- let ti = Date.now();
! h% P5 B9 E3 G3 w7 N! R3 \ - let rt = 0;( C+ g$ y$ F' u9 k% O4 c
- smooth = (k, v) => {// 平滑变化
, ?5 F2 h& J$ v2 K/ c) ?- K7 W - if (v > k) return k;( g" u" m* b% y& e
- if (k < 0) return 0;
2 B; `/ H3 Z5 P, L$ | - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
, I" C/ L1 p, E# z) M - }
5 d ?8 s3 H5 p% m' }! ~; g' N5 { - run = () => {// 新线程
/ c( j2 }0 E$ V1 Z8 D) ] - let id = Thread.currentThread().getId();
1 Z, ^* z9 L% L( u* ` - print("Thread start:" + id);( L, t5 k! c+ G: G
- while (state.running) {
% e4 {4 O# X. f - try {
8 S% n: D3 W& C! }6 F, p' D - k += (Date.now() - ti) / 1000 * 0.2;1 Z7 @, D3 A. U2 O( T' Q
- ti = Date.now();
* u2 D. p. W; ?; K - if (k > 1.5) {
) r. ?# C. D9 w. m; o8 P- _9 W - k = 0;& V E8 f4 J- V" N0 C% S' v
- }6 ?1 A5 h- U. e. n; G! g
- setComp(g, 1);
; l; ^! h5 @- c* T - da(g);
2 j w4 s: o7 U3 j6 M - let kk = smooth(1, k);//平滑切换透明度
% d' l6 B2 ?* h3 `/ r, z - setComp(g, kk);
: O# [- c. m3 W ]) V( a - db(g);
# v$ x c; t6 Y: l7 ? - t.upload();1 e: c/ m) z+ s
- ctx.setDebugInfo("rt" ,Date.now() - ti);. A( X; @8 w; C5 q! i3 J
- ctx.setDebugInfo("k", k);2 Q" f1 f8 a$ k7 d1 U- }$ ]+ a% l
- ctx.setDebugInfo("sm", kk);
8 Q8 z/ l% }4 E4 ^/ w - rt = Date.now() - ti;
& J2 Y# j$ D% S" u: f - Thread.sleep(ck(rt - 1000 / fps));
4 u6 k7 G# ?2 X) | Y6 c+ S2 f9 } - ctx.setDebugInfo("error", 0)$ X: r# ~0 g! l. d2 Y: |
- } catch (e) {
$ ] z/ D o+ D& ]- I/ O - ctx.setDebugInfo("error", e);' E2 A `! ~+ Q5 j
- }8 c, X% u- P7 l3 W; w, O# n4 |
- }
4 n0 j- E0 P& A! z' I) o2 j* i - print("Thread end:" + id);$ Z( ?4 W' J% i# B
- }! L" R v7 V* f# D+ x5 c! _; l7 Q4 N
- let th = new Thread(run, "qiehuan");8 g: o, x2 L" {) n( [1 y" l5 a+ _
- th.start();& i$ r/ w. _1 G( ]9 U; ? C
- }/ _- `; z; Z" N% B' I' k1 X4 F
' U- m; Y- d4 J- function render(ctx, state, entity) {
6 F w/ ^4 i0 _1 n8 Y! x+ n; C - state.f.tick();
4 e/ ]/ T. f$ n4 C8 T8 o - }" y' X3 |, m1 Q' F2 P8 ~1 o% p
. ^3 ^9 s1 I$ N5 C6 E- function dispose(ctx, state, entity) {
* F3 ]2 L; I* Y - print("Dispose");
( Q! f7 ]' ?# M2 y - state.running = false;
4 a0 V0 ]; ]9 u - state.f.close();
# K' A- f+ `1 U - }
1 @( p) r2 d2 ~: [5 N4 c& s
* Q- F4 F+ k3 L6 k- function setComp(g, value) {
e ?4 r9 b/ Z% Z - g.setComposite(AlphaComposite.SrcOver.derive(value));
' B4 R1 V/ z% f+ Z - }
复制代码
, r! [5 ? K/ }. d8 ^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 k% u+ X/ l& ]! \$ T2 l$ L9 E6 u/ g: w$ O9 }
) G, A& e5 K6 B0 J) C顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)
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