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& G) ~! W- v- z8 x6 S2 Y+ g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。( r5 b% K, I* ?8 l# n
- importPackage (java.lang);1 m6 z5 E' t% z. |6 i A. P8 _
- importPackage (java.awt);" i. }2 X$ z; k2 Y
- . V- }, ]9 C9 g S* X* u
- include(Resources.id("mtrsteamloco:library/code/face.js"));' b) q4 ?- J# ]7 R- B1 G" L2 U
# b. ?6 k& k0 ]9 X8 @$ C- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);- ?" e: }" W/ r' e+ s% U
- 6 e ?; Y* X6 K- m4 v
- function getW(str, font) {* E! ~. u% }# E+ d. ?
- let frc = Resources.getFontRenderContext();# @0 ]% d" w4 s/ Y* v% [* U
- bounds = font.getStringBounds(str, frc);* R1 N- Z7 F0 L8 X
- return Math.ceil(bounds.getWidth());" g: \) i/ Z, H _9 l
- }- B8 a, s6 f$ @3 w8 N# A m) F
( T4 ~( Z0 O' P4 D! q+ v0 g- da = (g) => {//底图绘制& z" `4 ^2 q) U7 @5 J3 ^8 _
- g.setColor(Color.BLACK);9 {3 j6 l0 W. c. X8 P' h% b+ o' g
- g.fillRect(0, 0, 400, 400);; X4 K9 K r F& g) ~
- }8 e+ R; J# I n8 w0 ^6 _$ V) J5 P
6 I/ P1 D3 S, Y( ~7 P4 D- db = (g) => {//上层绘制
; K4 L4 K) t7 V0 j - g.setColor(Color.WHITE);0 t1 C4 J9 T+ Z" K1 ?; k4 N
- g.fillRect(0, 0, 400, 400);
% j$ I3 |4 d y3 `: k - g.setColor(Color.RED);( U$ W( N" w9 v6 j# `
- g.setFont(font0);3 X" l9 m- g. V8 m' M
- let str = "晴纱是男娘";
! J& r9 q/ x. W& ]" X" _ - let ww = 400;1 \/ x4 m/ k6 C# T8 F+ a: B
- let w = getW(str, font0);
8 T/ @$ c1 Z; a! J" t" U3 y/ G& @ - g.drawString(str, ww / 2 - w / 2, 200);3 j7 ?. E" \: e
- }
# F. s" {* @9 P, X" U8 e - 9 X9 M3 R+ N) n7 @+ t9 f
- const mat = new Matrices();' C: x4 j( x/ N; G
- mat.translate(0, 0.5, 0);
* J5 t( c* K. f% v m5 U7 v
: _5 j6 Y% Y- `: |' O5 `- function create(ctx, state, entity) {
9 g, P7 c; _0 @& U; ^- G0 m. j! D - let info = {; W: ]: x7 g `
- ctx: ctx,+ ~. z- L5 G+ C+ t9 |8 |
- isTrain: false,
; F9 T% r: d+ a# t8 x) T - matrices: [mat],2 }+ ]8 O% ]3 J
- texture: [400, 400],
& U& ?) D. ~' [1 R; X* z& k - model: {
% a/ R" E& D' l1 x( ~, Q! X - renderType: "light",
* o% s. T0 O8 ?9 l - size: [1, 1],: x c% [* b6 G- ~) F
- uvSize: [1, 1]
1 K# T; r/ }; w H# @6 f - }; ^$ Z* z" K+ x }; m" R8 I x0 ^
- }4 S* B% c+ x& c( @& H7 H9 r a* L
- let f = new Face(info);
+ j3 Q/ H; P( M1 n4 b - state.f = f;& M# |9 W: j0 X6 ]
- [ m1 m2 H, S8 l# Y0 Y& y
- let t = f.texture;
5 E1 ^6 o% j0 ` n" f( R2 V - let g = t.graphics; O9 w* J- d0 ]( Z8 L9 c
- state.running = true;
: g3 `. V2 i8 Z) R4 u( X% n - let fps = 24;
: Q+ J) D3 N2 r - da(g);//绘制底图! y* Q K a) _7 _" Z7 `7 r
- t.upload();6 v& ]( n" w8 `' O& V# h. E
- let k = 0;3 y) h3 Y! b2 i, @+ Q. c" B+ R7 H; B
- let ti = Date.now();! h6 a* `" l+ C( R, q& }. S
- let rt = 0;2 l& O8 l- X; c( w$ g g$ Y1 y
- smooth = (k, v) => {// 平滑变化
8 H5 f( c+ i$ o2 F7 T6 S - if (v > k) return k;
! `+ P! z! \; K. o - if (k < 0) return 0;
/ Q3 W; t( B; W# b - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;: x; {/ f6 r; B6 U. m+ i
- }0 ?6 V, r U. C- n: e# w" q! m& T
- run = () => {// 新线程- O$ Q; ^! Y8 o; `1 K
- let id = Thread.currentThread().getId();/ y& T7 T4 D" b2 M/ f/ t
- print("Thread start:" + id);
% Q4 a; n9 n0 K - while (state.running) {) o: s' T: O/ {, x1 W9 i
- try {
) Z4 K+ N. h; X g- E1 @9 E$ D - k += (Date.now() - ti) / 1000 * 0.2;6 N! I! c' {, A5 x7 V* D( K+ s, Q/ m
- ti = Date.now();
0 @2 @& r0 V3 d8 S& _3 }* a - if (k > 1.5) {
; G% ]+ r" q% t( X - k = 0; ~" p9 @% M7 t; {: q+ T
- }
3 p7 Z. l6 X% [8 f" k% K - setComp(g, 1);
2 h8 R$ ~* B1 M, n% S: u - da(g);! V- R- F; u; }
- let kk = smooth(1, k);//平滑切换透明度! Y- I, I! J5 \7 L; _* _$ K: U
- setComp(g, kk);0 L5 Y4 |( x% x5 _4 G. L. `
- db(g);
0 J( c3 z) T- w- Q, o9 W, w2 l - t.upload();* F" ^6 b# j. v. |
- ctx.setDebugInfo("rt" ,Date.now() - ti);
. H0 m4 G: }5 O6 c - ctx.setDebugInfo("k", k);( c6 q8 u# d: d" H5 k% Y$ e; E" {, E
- ctx.setDebugInfo("sm", kk);
8 |' V; ?$ u. Z5 m& N1 a - rt = Date.now() - ti;. x" X* j) V" E8 Q
- Thread.sleep(ck(rt - 1000 / fps));' i% X! g; U6 t+ [# G6 {
- ctx.setDebugInfo("error", 0)
; y' e5 y; M1 }2 n9 E' t6 B2 X8 A - } catch (e) {+ ?4 G; k5 c$ D, s% H
- ctx.setDebugInfo("error", e);
- C% X2 T& M @4 A6 q - }
) j, Z k* @/ U9 Y* K - }( V4 o# ] N: S6 V: R: g# q
- print("Thread end:" + id);
' z9 F0 g) k2 H- _5 r - }4 u& }# N; w. `) g R( v4 T1 ]
- let th = new Thread(run, "qiehuan");
. N( x) \% i: S - th.start();
7 s7 B4 ~, j' A7 D4 z - }
' p: Z7 q8 o8 V+ d0 V. v& i - * `0 ?! i8 F; N- a
- function render(ctx, state, entity) {/ b' s3 a! D7 e( M8 W) y
- state.f.tick();4 I5 q' z ?1 w; |6 t$ U
- }
8 K( X7 w$ q2 i( L: U+ t8 c7 l - ! z* f7 [& H: @6 C
- function dispose(ctx, state, entity) {
3 ~7 W: N/ `" F8 K7 \ - print("Dispose");8 s1 z0 W; L0 {4 b# N* r
- state.running = false;
3 |! Y; I7 Y9 g: g: u4 Q- j: v - state.f.close();
/ h- W5 N) i- D; W& D: K" }5 ` - }
1 G A1 u3 b6 J4 p$ ~ - ; Q; Y; ?+ Y3 r0 i( r* ]
- function setComp(g, value) {
) U3 L: a1 T/ R p% C, M - g.setComposite(AlphaComposite.SrcOver.derive(value));
% A y2 x/ l: n0 z2 }0 @& N+ b - }
复制代码 ! A, m3 h- e- ?5 @5 p& V
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。3 j! q2 O5 L# b9 m: n4 c
* O S2 p* s# J% K+ o _6 l
6 E5 A+ x1 j8 V1 t6 V" a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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