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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。
+ y# F$ v! w, I$ E/ f" |- importPackage (java.lang);7 g8 c/ m2 y: I5 S0 x) L. z
- importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));/ a: h1 G4 ^2 D c; ]# z, Z
- H3 p0 N- E8 b8 }1 |2 z1 b
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
% f% y/ n/ C" {7 u' _. S
$ j* \9 x) J6 n9 O6 o9 V- function getW(str, font) {
- T5 @$ P- E w9 H - let frc = Resources.getFontRenderContext();/ o- [1 W7 H7 ]9 ^* h
- bounds = font.getStringBounds(str, frc);
3 W- T. R% k& W- [+ w- N- E - return Math.ceil(bounds.getWidth());
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- % X! p" x7 x* w0 S) |. y0 }
- da = (g) => {//底图绘制% X% ^# n& ~* u9 X) t, }: @
- g.setColor(Color.BLACK);7 K/ Q; T4 ?. `( |9 B E5 ^2 K
- g.fillRect(0, 0, 400, 400);5 `) X# N, j3 o$ ~' t: s* C6 F
- }2 }& h$ Y* N" S1 |- N8 {% j
- 7 H9 K2 N; F. g" x( B, p
- db = (g) => {//上层绘制
4 N6 h/ t4 i, B/ f7 c( b - g.setColor(Color.WHITE);
! R. ~) z/ `& g$ j - g.fillRect(0, 0, 400, 400);
. P6 s8 R& |2 ~) x! m5 ` - g.setColor(Color.RED);
4 g0 _" C! R9 A* Z - g.setFont(font0);; b8 Z. y6 e/ v6 G0 X! C
- let str = "晴纱是男娘";9 H. g2 z4 o( @- l+ V. M
- let ww = 400;6 V. T, e- m9 J
- let w = getW(str, font0);3 _: }! o9 J& u6 [" z* y
- g.drawString(str, ww / 2 - w / 2, 200);
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* Z8 ]3 T$ c. H# R/ e- const mat = new Matrices();3 w+ X$ p, w' G1 y4 e: i
- mat.translate(0, 0.5, 0);2 A# g# v/ i: r1 p" T
- / r0 j* {: ~) C, `) f4 r
- function create(ctx, state, entity) {
; ^" B/ h. f2 ~ ` - let info = {
- _) [5 m( g& @) A8 v# c3 e5 b - ctx: ctx,2 v# m. m' e: @* y0 c- ~: E
- isTrain: false,/ T2 L& ]9 H+ p
- matrices: [mat],
- g/ ~% E7 H: S: |* C J4 q" y - texture: [400, 400]," w3 n, b0 o6 o
- model: {* R; i+ x! d$ x/ [* W
- renderType: "light",
6 I7 p! h9 |, g3 Z! g) J - size: [1, 1],
1 t/ I# L, c7 S/ C - uvSize: [1, 1] V, [* @6 d9 d C' f4 `- ^+ S- H6 _
- }
! W! ^* V( o: j: \7 B - }
. g; a, l3 C" z - let f = new Face(info);$ v" B( ~& z5 F' H5 P
- state.f = f;$ O% m' P7 U e0 n
0 S! V5 a _- O2 N( Q- let t = f.texture;/ t# n0 m" G! ~' r, r
- let g = t.graphics;* f& J7 ^; R/ W. T7 M, Y* \
- state.running = true;
* d7 g% g" O; t8 t - let fps = 24;. I# J) H4 a& D& t- J& R6 A
- da(g);//绘制底图
0 m- @2 H% S7 g) z2 s0 W - t.upload();
* {- m q) o, \ - let k = 0;
! z" X2 R$ W' ~ - let ti = Date.now();3 x2 d, [: C2 \! Q4 d0 j8 u: W. \
- let rt = 0;2 o. O) A' S2 n5 T4 x5 j
- smooth = (k, v) => {// 平滑变化
! c- ?8 a% z' y2 Q' F2 D - if (v > k) return k;. f' [( k! c0 v6 C% X6 o+ h
- if (k < 0) return 0;* T! f+ C5 R. r- I" v9 B
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
3 a3 H" [3 U" M - }
; K. G' }5 {2 _+ q# ]+ u) y" a$ d - run = () => {// 新线程
D: K# V& j1 o s+ r; o - let id = Thread.currentThread().getId();6 ^. [/ S; [+ Y2 R9 ?, V( T) W
- print("Thread start:" + id);; c- I. F+ E4 h% b
- while (state.running) {
- f) Q) {/ _+ n" o+ P9 r# t - try {. ^! o% a( a0 q% H& N- u
- k += (Date.now() - ti) / 1000 * 0.2;! k: |! _; _& m# _* T
- ti = Date.now();
2 c4 U2 B# N1 c" {. d - if (k > 1.5) {
% ~# ?4 ^! F) p! I3 L+ w - k = 0;; o# t/ c& e& C" J3 `; l
- }
: R7 }8 ~& F5 u, s- J% v' T - setComp(g, 1);
1 [: u) w/ |7 E: Q. I. ^6 w - da(g);$ S! g* I. I- c' c7 D
- let kk = smooth(1, k);//平滑切换透明度6 ?/ }% X! U4 e$ K' t
- setComp(g, kk);
" E6 R' A" N0 v2 o, t, G9 _. ~ - db(g);
- v. J, }; q5 m1 w1 R/ K. s - t.upload();
6 l+ ~: w7 N) `& ~% \+ w$ D - ctx.setDebugInfo("rt" ,Date.now() - ti);5 l4 {9 H1 d0 e
- ctx.setDebugInfo("k", k);/ N& @& g! W( Z' Z' d9 V1 m
- ctx.setDebugInfo("sm", kk); @( n7 S; n: g2 |
- rt = Date.now() - ti;- k6 Y: E. H/ j# E2 u
- Thread.sleep(ck(rt - 1000 / fps));5 v" [6 a+ k9 v! J2 \0 {
- ctx.setDebugInfo("error", 0)
: i+ b2 P6 U6 M6 y: \; f+ w - } catch (e) {3 ~. z8 |% u1 D' u6 q4 T
- ctx.setDebugInfo("error", e);2 n; B; U: r) v+ I- a% K7 h8 I
- }
3 [. X( q; P- N+ m. S3 ?8 C6 v - }
5 Q- e$ d4 {/ n6 \" U) d. H - print("Thread end:" + id);
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J! n. [- u) J - let th = new Thread(run, "qiehuan");' L/ P3 C+ M/ c# l! P" L+ X
- th.start();
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- ' U* P# V' C" m& A+ r7 w
- function render(ctx, state, entity) {
0 a5 O& W. `; x) n1 q: { - state.f.tick();+ j9 D; X! g g; ~" Q
- }, s6 J; l2 D- f2 Y3 Y3 p" [
/ H U% m" f( n( B! f) S' b, ]1 R- function dispose(ctx, state, entity) {
5 y, X# M) B: d" X0 S5 w2 a - print("Dispose");
9 k3 B8 I/ m$ t5 a - state.running = false;8 s; U9 U; i. L# G
- state.f.close();6 n. Q& i% ]. T9 ^
- }
* a( d: d5 r. R* e3 U3 I0 i% M! K7 x - 5 t( m# K" R& w$ }
- function setComp(g, value) {
+ y) d i: B0 @, z" p0 J - g.setComposite(AlphaComposite.SrcOver.derive(value));
& d5 f7 B0 c0 z- i: ]; O - }
复制代码
8 w, Y6 J" B' w5 g: u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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M4 I) h# S, p顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)0 i0 Y3 s6 s3 |8 p% W
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