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0 L0 X7 H1 g. }# D& 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。
9 N, B+ d3 D+ A! d4 J" o8 [- importPackage (java.lang);1 _, G, E5 y+ Q8 D P
- importPackage (java.awt);+ }& I- r0 C3 [4 t7 j2 V
2 L& @0 E, w! G- include(Resources.id("mtrsteamloco:library/code/face.js"));# w8 x' t" S) n
- ( x5 y9 S) k* w/ W. u7 Y
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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- function getW(str, font) { p# E0 _* A/ P- n5 Z
- let frc = Resources.getFontRenderContext();. u/ R4 W0 u/ w/ A. G
- bounds = font.getStringBounds(str, frc);
* m- o- Q( l5 ^ K" q' n; _- m - return Math.ceil(bounds.getWidth());$ a" Y8 C" O; F" J8 W
- }
( r, l& f% P) ~/ x! e' E - & J" P) h: r, A5 m$ {
- da = (g) => {//底图绘制
O1 A: P5 Q. E% m7 N) K; E - g.setColor(Color.BLACK);0 N. x% b3 v9 `6 `9 a/ Y7 o
- g.fillRect(0, 0, 400, 400);) J) D9 Q4 ^, A+ r$ {; r
- }
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8 i' j$ R) a& N7 I# \( Q- db = (g) => {//上层绘制% L' ?- L; _) l! n" {
- g.setColor(Color.WHITE); x. _0 G. E* e" w7 U" `1 k
- g.fillRect(0, 0, 400, 400);
4 w7 @% c" ?5 q) l! B* @+ D - g.setColor(Color.RED);
3 r3 y' E3 s$ H- V - g.setFont(font0);
; ^0 P2 b7 C. F2 P8 e* v8 W# @ - let str = "晴纱是男娘";
, _# p: C; K2 z" Z. p3 L - let ww = 400;& [* {0 A h% S* K
- let w = getW(str, font0);
# g- N3 h0 @9 c - g.drawString(str, ww / 2 - w / 2, 200);
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" A5 Z$ D% _, X c$ t& G- const mat = new Matrices();' b& V1 g( v( y( y# {& |
- mat.translate(0, 0.5, 0);% t6 i" g7 m7 [3 z$ j# ?
- 8 g' V' q7 \* F) o/ I# {
- function create(ctx, state, entity) {
8 M7 _( L. B7 C1 @# o. d" X; o+ ~3 d - let info = {' p5 w& P2 J1 h3 |. ^
- ctx: ctx,& K; U' H/ |- M( C- c# o- t- @
- isTrain: false,
. {6 G9 W. n3 v% Y k - matrices: [mat],
8 U6 [/ s4 ^' Q5 d - texture: [400, 400],0 M4 R' f3 [2 f5 H& c+ I6 ]' y
- model: {
9 L" ]+ f F5 L7 _/ w$ v) l - renderType: "light",
6 }% g% A5 ^4 t - size: [1, 1],: d8 K' r2 V, }1 P6 F8 i' v
- uvSize: [1, 1]
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- }
0 }1 t6 z9 @4 M' F# C! [ - let f = new Face(info);
; J) K0 W* `3 |: O9 a% T# M - state.f = f;
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- let t = f.texture;7 i5 E) t% [& _( K; W! ?: a
- let g = t.graphics;* q% l: w( a: C4 @" `7 f
- state.running = true;
9 T; s3 i. t- ]+ s7 U - let fps = 24;
9 d @ l u u: P - da(g);//绘制底图! R/ N& Y. m8 w5 u
- t.upload();
& c. R$ |: z( P - let k = 0;
- l: H; ^+ x. ~* F5 V - let ti = Date.now();
% S/ C: j: t1 d6 J- [ - let rt = 0;7 C2 O( x; C ~- ^/ `
- smooth = (k, v) => {// 平滑变化
% {- L- [# h9 p- d, U - if (v > k) return k;; K8 a5 @9 A1 K" e8 I: Q1 [+ K
- if (k < 0) return 0;) S ~, V! v1 r
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
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- run = () => {// 新线程7 Q2 A2 J- }4 j; ?
- let id = Thread.currentThread().getId();
1 ]# J3 @( P% I) L, N7 V - print("Thread start:" + id); h3 \2 w7 Y& K
- while (state.running) {/ T @$ `; V% Z! q1 ^/ G
- try {6 t- M! n6 R* M' i" Y3 q
- k += (Date.now() - ti) / 1000 * 0.2;
2 f4 O. q9 k4 s5 H( a - ti = Date.now();# o/ g! [5 @7 s+ W' c V
- if (k > 1.5) {5 b' H$ |$ c1 }7 L5 b( m
- k = 0;
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- setComp(g, 1);2 [ e4 j/ S* ]% E" m" f
- da(g);
% T. ^& E" B* A1 P3 v/ f/ q - let kk = smooth(1, k);//平滑切换透明度
0 E4 l M6 x2 s) ~; f - setComp(g, kk); {9 C4 B' d. d$ P0 L
- db(g);
6 q# }' I6 j2 {1 K - t.upload();7 d/ v* Z/ g& _
- ctx.setDebugInfo("rt" ,Date.now() - ti);+ R/ p- q7 m0 _; E% ~6 `8 `
- ctx.setDebugInfo("k", k);
! P8 Y' \1 ~& t+ K' K - ctx.setDebugInfo("sm", kk);
, p* W. B, b& m$ G2 { - rt = Date.now() - ti;; C0 h5 ]5 X$ N/ \: R* g/ G" z
- Thread.sleep(ck(rt - 1000 / fps));
+ O7 Z& M# Q3 i/ s/ x. N4 ]0 I - ctx.setDebugInfo("error", 0)# i2 T2 v8 A+ O- w$ `9 C; k% Y; l
- } catch (e) {' f; b( R" k- x4 X
- ctx.setDebugInfo("error", e);3 _5 }1 D8 B0 g. f. `
- }/ y5 R7 G2 D6 o+ q# ]
- }# u8 Y6 A2 |# N& A) J, G2 N
- print("Thread end:" + id);# \5 l# {2 i: X" L: Z* L
- }
2 C; X8 V/ n5 ]+ S8 ` - let th = new Thread(run, "qiehuan");
. ^/ L6 ^" M+ Y9 Q - th.start();
" _7 b/ F. l0 f& j! \ - }
1 f& k$ ~. K0 {0 e3 E1 }
$ m$ r& t+ K1 [- function render(ctx, state, entity) {
9 h- U1 X W) f. y5 M, ]4 r7 ~ - state.f.tick();
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- $ N8 r9 h, z5 T4 r( v+ Q/ N( g
- function dispose(ctx, state, entity) {
2 a7 ?) L. N, o7 H8 e! V! C - print("Dispose");
: w% u/ Y: A/ b - state.running = false;5 v- ]0 i( g, M6 y
- state.f.close();' w& M/ h2 ^7 s4 e8 t2 {
- }" h; T- b1 T: w$ N
- 0 b, t2 r7 i5 Z
- function setComp(g, value) {
% g& \4 w% c5 V6 Q2 v5 _ - g.setComposite(AlphaComposite.SrcOver.derive(value));
* \" i( l4 m3 I - }
复制代码
$ Y6 V( G/ R3 P. w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。
$ O i0 z4 A+ A8 k' k7 O c6 f/ B* k0 L% c* P& `; G
r& Y8 \: w6 U l/ v, t$ h. F" ~
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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