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& O, ^* L |& K* S0 d0 P8 B2 T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。
7 M# C: g1 A3 `" W9 l m1 W- importPackage (java.lang);
. w1 t# x6 ~$ q( L+ [ - importPackage (java.awt);7 @, {+ \2 }% |3 Q6 J
+ }# z/ k# R) p- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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6 {+ S* c8 n4 G8 o% m* `; p- function getW(str, font) {
8 h% M+ L4 W6 A1 I" Y7 J# F - let frc = Resources.getFontRenderContext();
& O7 X* N: l' ?+ ^4 r' P0 M/ i - bounds = font.getStringBounds(str, frc);0 z7 i1 H7 O( i" P3 `
- return Math.ceil(bounds.getWidth());
- p& R& X' O# w/ d) ^/ D0 ?% |# Z4 ] - }
& B3 w& W! \" Q3 ]0 b9 s - ' N( L j9 R/ l! D* A. [9 O4 Z
- da = (g) => {//底图绘制
. B' W1 B* m& O' c: H' n" ]. Q - g.setColor(Color.BLACK);
! Y- ?8 R: o: }1 J - g.fillRect(0, 0, 400, 400);3 N" o) m2 e$ k% B* l
- }& {2 _% D/ j8 P5 |( L
- 7 H( ~$ h0 i7 @/ q
- db = (g) => {//上层绘制
9 @% E6 T$ E) q1 C9 R0 p+ s - g.setColor(Color.WHITE);5 X$ [" ^# V' T. `
- g.fillRect(0, 0, 400, 400);
8 ~8 K9 k1 W0 Y: K* B! _5 H - g.setColor(Color.RED);% G2 f9 W2 v' Z% [
- g.setFont(font0);
$ E" a2 w! F) Q2 o - let str = "晴纱是男娘";
0 N' H0 k' Q3 Y" O% X - let ww = 400;
3 d- K8 h, z, Z - let w = getW(str, font0);
) B8 [( b. D# J* o - g.drawString(str, ww / 2 - w / 2, 200);0 Q) U L3 i6 U, q
- }
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- const mat = new Matrices();
" o! ^8 x S; P$ R3 W/ u - mat.translate(0, 0.5, 0);% t9 G/ t1 k# d( q6 v0 J' c- u
( L& t! L, b5 `& U8 v- function create(ctx, state, entity) {$ ?+ A) q3 j+ H' o
- let info = {
2 t( E: r+ P# G) \6 e, J - ctx: ctx,+ ~4 C( K, R. ~! U3 d0 p! A) A
- isTrain: false,
! M- u/ y1 J& o2 L - matrices: [mat],& b1 M( N3 E# D8 N/ ~) W
- texture: [400, 400],
( \8 D1 Q' }2 Q( \# T) T) q( E* ? H- o - model: {8 i( E* q6 d2 F
- renderType: "light",
7 ]2 {# c8 @( A% I. b- R; }6 K# b - size: [1, 1],
: E0 U4 G2 r1 X; X+ c9 I1 d - uvSize: [1, 1]* V, x8 q) f# Y+ C8 z
- }1 J/ F& z* R1 V5 T
- }
+ Z6 k* Z/ b! c# K3 A6 d - let f = new Face(info);- u% d: s+ g" U8 d3 j7 \; A9 l# c5 L
- state.f = f;8 ]5 P1 J _2 i$ f& i
- ( O8 y+ D: H/ ?2 R
- let t = f.texture;
( k8 R: H$ K2 J5 B$ Q3 e - let g = t.graphics;
1 z8 D6 J- M5 U3 t/ U% r# b \8 m - state.running = true;
6 X, _7 ?) e: K# d$ G4 T' w - let fps = 24;
# K: i- u" r- S) {6 [( j' C( p* r - da(g);//绘制底图: k8 q! Y; c4 p" Y& h p( R- d
- t.upload();$ l3 J0 K* Z1 D% n+ b
- let k = 0;/ u% X7 L Z$ t" V3 K& `
- let ti = Date.now();9 N/ V7 b- t8 ?2 }7 t8 m% n
- let rt = 0;9 d9 R' t( u/ f) u/ ~0 b- d- z1 a
- smooth = (k, v) => {// 平滑变化
- y5 u: o- a) ]3 r/ D; m( T - if (v > k) return k;* H( \5 T2 S( B0 _$ u( o2 }
- if (k < 0) return 0;
1 s; x$ |' _! t( l6 J2 C - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;7 r. N) Q. D- ~3 |$ P
- }
! B; c( p U0 @0 ?- U: z1 ^ - run = () => {// 新线程5 o2 C+ C* A6 A6 X# ?$ A$ `
- let id = Thread.currentThread().getId();" L1 ^6 ]$ i+ d8 _2 |8 q
- print("Thread start:" + id);
4 y% H# X. M# Q8 j1 w" Y - while (state.running) {1 c- P! G5 S+ t9 Q
- try {. b. o0 O5 g" p T
- k += (Date.now() - ti) / 1000 * 0.2;
$ p- z; L& c: i* w1 ]/ W - ti = Date.now();
6 y; W( j' u( y0 x; y7 I' N5 U - if (k > 1.5) {
/ E5 B; e* H$ k8 C: P3 v4 ?0 ?4 D8 _ - k = 0;1 E) q6 D D5 r, a; S( L7 t2 H
- }, C3 T. L) i! {
- setComp(g, 1);+ N: b) H# F6 i6 E. V
- da(g);. k9 h8 m) z2 f; k0 M5 l8 \
- let kk = smooth(1, k);//平滑切换透明度: V3 H$ m' }0 l3 P
- setComp(g, kk);3 ~6 _3 U/ S' K; F1 Y! u' n
- db(g);7 L( h+ s$ Y( t( p; S! N3 r2 w3 Y
- t.upload();& g/ U# P0 s: |0 Y J5 b+ v/ {9 A
- ctx.setDebugInfo("rt" ,Date.now() - ti);
; k+ o# n" b! d9 s& d0 m - ctx.setDebugInfo("k", k);
: G# O0 D- j g; B: @ Y; a - ctx.setDebugInfo("sm", kk);
9 t2 i% i2 Z3 W2 v6 G - rt = Date.now() - ti;
7 a; t8 l% [ Y! `5 C1 I/ h& M: ?: _ - Thread.sleep(ck(rt - 1000 / fps));
1 L7 u. n9 W7 D4 \; }; m - ctx.setDebugInfo("error", 0)5 ?+ C3 S2 F- \% L# H6 j* M
- } catch (e) {
: R! s v$ [, I& t4 t - ctx.setDebugInfo("error", e);
# R' l- z5 a( H% V( @0 y - }
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- print("Thread end:" + id);
8 Z4 b6 ~. `2 p0 }7 \; ` - }: [, s. A2 M0 y
- let th = new Thread(run, "qiehuan");
* z- W( r m5 p& o/ Y - th.start();
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- ! Y, y4 k# C) f* Z
- function render(ctx, state, entity) {; l6 L5 _7 J; S) K1 M4 D
- state.f.tick();
! \9 _0 a3 Q* Q1 B# o$ Y) L - }
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- function dispose(ctx, state, entity) {/ A- n; x% X& V& P3 W# c4 T# O, A
- print("Dispose");
/ l, z8 [5 ]9 }# h8 b9 u I4 s; [ - state.running = false;2 v# F- a+ \" E+ l$ v, F/ L
- state.f.close();2 u4 r5 V, v. t* w4 w
- }
# Z" z8 I8 F- f- C1 c( Q) Y
% _: J: C P: e& L- function setComp(g, value) {3 _; m8 Y/ O9 B$ U: D& G
- g.setComposite(AlphaComposite.SrcOver.derive(value));5 {- ^5 M# D& ~: \) M; _/ H# I
- }
复制代码 ! T# E+ d! f/ v7 D
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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$ V. e0 `; k# r& W' F$ L顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)8 f- N/ Y# g7 n5 d: p
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