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. P* U" w: B% f6 e% _- c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。
; ? r0 k9 S7 W! y6 H/ z- importPackage (java.lang);
) p2 `7 }6 C; `# L - importPackage (java.awt);
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- ~8 g( u1 @: r/ S- include(Resources.id("mtrsteamloco:library/code/face.js"));
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' X5 }6 M* [; y# {8 J+ T7 H- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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6 E, g1 L3 |7 R% q6 m: w* r- function getW(str, font) {
4 b% s& C6 @' M - let frc = Resources.getFontRenderContext();
. }3 I' h2 \* d- p4 B - bounds = font.getStringBounds(str, frc);
: ^7 j i: j/ ~8 X8 X. f - return Math.ceil(bounds.getWidth());' Z& B7 L; F4 v* R% \
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- da = (g) => {//底图绘制
' o# c F4 k; f& t3 F - g.setColor(Color.BLACK);
0 w$ |7 B7 J1 j* J - g.fillRect(0, 0, 400, 400);; x0 x( d. n, ^ w% J# d4 f
- }/ `6 P+ s0 n# y6 [* @
- Z+ r. s& ^) `- db = (g) => {//上层绘制. W0 {) K5 ]1 N; s c
- g.setColor(Color.WHITE);1 r% c' T' e$ b
- g.fillRect(0, 0, 400, 400);& q* {6 s3 y& r [$ H, b W
- g.setColor(Color.RED);6 ?: d( H/ T$ u6 I: Q
- g.setFont(font0);
' ]$ c" [5 @' g& Y7 i! @7 d - let str = "晴纱是男娘";
6 U2 p7 Z3 N# A4 q. b - let ww = 400;, r9 |$ r* R2 c: m$ Y+ F
- let w = getW(str, font0);
; S! E- h" G$ {( e - g.drawString(str, ww / 2 - w / 2, 200);
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- const mat = new Matrices();
& @, n0 L# V- s: ^ - mat.translate(0, 0.5, 0);
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% a! _- e' M/ N; ~( V/ r7 ]- function create(ctx, state, entity) {
3 `/ F3 i+ t m' h - let info = {& T4 e. C3 j+ ]2 f$ I: l
- ctx: ctx,7 ~. ?- F* }3 \: [) P& X
- isTrain: false,: k" E9 y9 A1 l1 ]9 q* X
- matrices: [mat],0 e _! L/ k, |6 W1 `7 R# b
- texture: [400, 400],2 P: j" E. [8 v
- model: {
3 m" z. O* p; o9 C( u - renderType: "light",7 {' ?5 r1 \( D6 M. G) U$ a
- size: [1, 1],; M" R s0 {, X3 P
- uvSize: [1, 1]
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- let f = new Face(info);$ n: ~5 Z% H0 m+ \7 m
- state.f = f;
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- let t = f.texture;
- ^4 C& a4 Z" j* ? - let g = t.graphics;8 T. o# q! y; F" K
- state.running = true;. c! c3 }. f8 M* G
- let fps = 24;
! v* S% g- V3 ~' z( [ - da(g);//绘制底图 s' S: p' S; [# I; h7 T
- t.upload();' D, s2 y3 _, N5 j% R
- let k = 0;$ z, N8 e& i) M% v$ {) A
- let ti = Date.now();; i7 F/ x+ p9 o7 j' j/ a
- let rt = 0;8 [$ I" Z3 y6 w8 ^" t. P
- smooth = (k, v) => {// 平滑变化& U k$ V* R8 M e% u3 r
- if (v > k) return k;; g$ X+ m! _9 W( h* Y& k
- if (k < 0) return 0;( _' A) D/ C4 T5 E g
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;1 C5 B2 K5 Z( K1 B7 _* B! w3 ~
- }
0 G/ s$ b) ^8 i) O2 M - run = () => {// 新线程% Y1 J+ O! ^; U: D* j1 o6 F
- let id = Thread.currentThread().getId();
" I/ w. z2 l' i - print("Thread start:" + id);8 S% t' {% f5 _1 p. |8 Z6 i
- while (state.running) {9 M7 j' a/ O: i. Y! |0 c# W; X) }
- try {
6 w! ~& I) `- C, K ^1 } b5 ~ - k += (Date.now() - ti) / 1000 * 0.2;8 @+ S, e. w& q, n% c1 A
- ti = Date.now();
/ Y5 ]) l5 Z2 l! n! j - if (k > 1.5) {
- P8 L% m8 h8 q - k = 0;* f$ \7 ^6 K( k& i; k
- }
K4 T& p" q+ L9 K4 S, f. l - setComp(g, 1);3 {- e: C4 [3 F. n
- da(g);" D( h8 [: Z4 |% G
- let kk = smooth(1, k);//平滑切换透明度
0 B' w% e& i' ?0 c - setComp(g, kk);
9 ~) @" M2 Z4 k, m% U; F - db(g);2 j5 v) a0 e. T% F
- t.upload();
5 ?( s I% W5 D: f8 p5 [# V7 R - ctx.setDebugInfo("rt" ,Date.now() - ti);
6 ~0 C( \% g8 h$ p - ctx.setDebugInfo("k", k);
c+ L7 G8 }7 Z - ctx.setDebugInfo("sm", kk);( c% E5 Z0 a- n: `6 ~3 g4 Y$ L
- rt = Date.now() - ti;
- L/ E- i) d- v) C4 k( X% r - Thread.sleep(ck(rt - 1000 / fps));
9 S2 w5 [0 V! J7 b* I: \9 J - ctx.setDebugInfo("error", 0)
0 m' F N/ c; T7 S - } catch (e) {
5 c! Q( O, J; S& w& ` - ctx.setDebugInfo("error", e);6 W+ t0 _' U; S# q) c; T7 d: H2 E
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- print("Thread end:" + id);
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- let th = new Thread(run, "qiehuan");
% l: b, l, k' |! B - th.start();$ m& k" m. @) i( Q$ J
- }
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0 B, V1 p2 ~6 J8 V) a% F( @- function render(ctx, state, entity) {6 s4 v8 l( u r# Z ?, @2 y0 u. G
- state.f.tick();0 z, {1 |! i A3 I) f* \
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) b, ]6 K( f- r% J( F+ A. E$ i- function dispose(ctx, state, entity) {1 z5 w7 W% {* N- G
- print("Dispose");6 V: \5 d" G+ Y& q
- state.running = false;
$ |6 z h. v+ r( z3 [: D - state.f.close();
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- 2 U: C$ N5 y. Y- n& n" f
- function setComp(g, value) {6 D! r% F! k' Y
- g.setComposite(AlphaComposite.SrcOver.derive(value));
5 q7 O. j# l' N* r. S, h - }
复制代码
" u6 g7 |6 a$ _9 [3 C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)
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