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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。
) M# {0 M& G) H* c5 ]- importPackage (java.lang);/ k `# n* b0 ?
- importPackage (java.awt);
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! c+ _8 F5 @' k$ z2 M" I- include(Resources.id("mtrsteamloco:library/code/face.js"));. U) L3 A( P7 ~" Z* M% S: L
" _/ C0 a8 j1 ~4 Q- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80); X$ g, W1 c7 f$ f
. `2 o* e6 K5 @# E( V. f- function getW(str, font) {$ o- ^! |" e% P6 ?) T
- let frc = Resources.getFontRenderContext();" d' M5 I- }5 }9 Q* x, Z
- bounds = font.getStringBounds(str, frc);
" F" W) [5 \3 t* w - return Math.ceil(bounds.getWidth());
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- 7 l" Z7 i" F* ]
- da = (g) => {//底图绘制: h3 {% X7 H1 |+ f# d* {; o* F
- g.setColor(Color.BLACK);
9 \; J- m6 X& K2 S. t# e: Z- } - g.fillRect(0, 0, 400, 400);$ v- V6 M. o/ U1 D( m$ b+ E
- }) R y% L- c2 d! ~2 h: t
- v5 O1 t1 p; p. p1 l4 l9 G- db = (g) => {//上层绘制
c$ L8 A0 _ Y, M) U5 b" w0 ? - g.setColor(Color.WHITE);
( R( B& ]( L$ X: o; ~2 \& p - g.fillRect(0, 0, 400, 400);
& ]3 l+ S9 ~& t: U4 B - g.setColor(Color.RED);% X* A: B$ T: [0 m! n9 F) c; \2 `- g
- g.setFont(font0);
, u: |' B% Y; \3 z! s& s$ ? - let str = "晴纱是男娘";7 h4 c, m# ^" v, Z
- let ww = 400;/ @3 h8 p3 K, J% _# f( ?! L0 G
- let w = getW(str, font0);
7 x' h' t% ^5 [$ l5 Y! d - g.drawString(str, ww / 2 - w / 2, 200);) J+ U6 |. b- z" C0 a0 [$ w
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2 M# N' K; F) \ f) M+ e- const mat = new Matrices();
: E* a! Z6 |3 |' ^& Z H! [ - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {8 P/ g1 }# }( h% A. `
- let info = {
- M4 s" ]- r: ?. W& l, j+ h3 m - ctx: ctx,, K9 z6 C% o' c
- isTrain: false,+ {1 W# I( K4 w0 k O3 Z ]
- matrices: [mat],
9 s- U4 ^% Y# J* [. s3 k$ V& H - texture: [400, 400],
9 t5 \. t+ v8 i b r; J. t6 d; W - model: {% L, Y2 j2 ^+ w
- renderType: "light",2 K9 w3 t$ X0 ~- r4 P
- size: [1, 1],9 }) g$ z; R7 F3 E* j
- uvSize: [1, 1]
2 {4 Q5 B& Z- |) H+ \5 }) G - }
' n4 J: ?& j, {/ [ F! h - }
5 n; F" e7 z9 ~: d* _" P - let f = new Face(info);$ B/ i% i. }* g& Q3 v
- state.f = f;, j2 e: U6 }6 H3 I8 z" P3 Z( j8 u
- 8 {7 k6 n$ u% l2 C' U
- let t = f.texture;
- s4 O) \( ~* x - let g = t.graphics;
, J, X1 S0 `) y - state.running = true;
" i( @- J: e4 e I% N3 V. z - let fps = 24;
3 |$ ]. k u2 R1 F3 P; A+ o, ` - da(g);//绘制底图
5 v$ {5 l0 P/ H& @' s0 Z - t.upload();
' t7 M) s& v% s, F: B/ |7 b; {/ e - let k = 0;
; C' o7 p3 r2 a& q - let ti = Date.now();
: p9 Q/ G7 d ]& C, n- u - let rt = 0;9 ]2 e' t$ x, `, s, P3 W
- smooth = (k, v) => {// 平滑变化- E# v% u9 f! r/ E \* \) x* W7 Z
- if (v > k) return k;# E R8 H- Y+ x2 G1 M
- if (k < 0) return 0;% y) F/ H3 \3 T& Q4 ~7 s- m9 L
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
& @ i6 X6 C1 ?; q& o, R - }3 {7 ]7 }+ H( o1 X$ S, X
- run = () => {// 新线程+ K0 e* G8 r! d2 Y6 x
- let id = Thread.currentThread().getId();
! S; V: v3 J$ _1 u - print("Thread start:" + id);/ W0 Y. h; m$ w/ r0 t
- while (state.running) {( r. K U; c- {1 P
- try {
f. b. R# Y- r- m! h) v - k += (Date.now() - ti) / 1000 * 0.2;
0 u" K. ^$ D+ S. i - ti = Date.now();: z' ]" n! U+ I$ J& C1 W6 Q% ~$ F
- if (k > 1.5) {3 i" u& a2 s8 T9 D
- k = 0;
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- setComp(g, 1);7 X7 o7 W3 A9 g0 m
- da(g);. U, Z. {- G4 }; | o2 |/ H/ w
- let kk = smooth(1, k);//平滑切换透明度
$ r& Q; D8 {" c+ [- w0 L8 I - setComp(g, kk);3 r1 }& u0 q5 ]) F
- db(g);
& }& c* v0 W9 I- X i$ v - t.upload();( T2 [3 k4 ?5 L) k! S1 w
- ctx.setDebugInfo("rt" ,Date.now() - ti);# U5 s/ K, `; C$ I) M5 \1 t& o P
- ctx.setDebugInfo("k", k);
( ]6 c1 }2 u/ x, N7 N6 U - ctx.setDebugInfo("sm", kk);# K4 t8 C. O" [3 L
- rt = Date.now() - ti;* U% E1 _7 }* f+ E1 o1 S
- Thread.sleep(ck(rt - 1000 / fps));6 M8 Y% z+ @( _3 g- O
- ctx.setDebugInfo("error", 0)/ } E/ n: S' R" M- B% u
- } catch (e) {, ]- Z4 z) I2 X7 A" s4 T& a; k( d6 L
- ctx.setDebugInfo("error", e);
9 i+ G1 N# g7 b$ ~ t9 M - }
- F* f7 _; h# q: Y - }2 e% e1 a# h! j% s8 a) l3 W: \) f
- print("Thread end:" + id);6 y6 \( | f( Z! j0 X
- }
* q, P, m7 u- V. J' d8 I% U - let th = new Thread(run, "qiehuan");6 T( d; B6 V$ E" g
- th.start();
% ^- Q$ Q6 A" P - }
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- function render(ctx, state, entity) {
) E8 ^6 G- I; {! }. s - state.f.tick();+ P4 _. Y% v% T# M7 x! r5 L: K+ K
- }
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3 ^! u' b7 N- ~, q6 S- function dispose(ctx, state, entity) {
$ J$ a4 |; Y) O- `5 L) x- m$ n0 T - print("Dispose");/ p' X. p5 G* a& K6 I/ M' }
- state.running = false; q( ?. ~# f& o# x
- state.f.close();
m* K. v1 w2 d0 ~4 ? - }
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- function setComp(g, value) {
, y, `3 ?4 i+ Y. C' ?+ Z$ o - g.setComposite(AlphaComposite.SrcOver.derive(value));
+ D, o; n8 ]; K, Q - }
复制代码 ! ]! V( Z( U# ]0 n% q2 d. j" x
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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