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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。
; \6 K% T% |! X5 q- importPackage (java.lang);
/ g5 v( I6 ]' T4 U) y& `5 s8 h - importPackage (java.awt);2 ]0 P4 y- F$ b6 f( W
- 4 A9 A- e9 q/ q6 U9 r
- include(Resources.id("mtrsteamloco:library/code/face.js"));# J+ s$ {( U! J$ [* |% i U
- 5 I7 K( e7 i" Y+ ~5 _2 _& O. [
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
# U% y( P: P3 [: H8 M/ w' X* }
' ?( I2 y; ]5 U- function getW(str, font) {2 N) g( B' U1 q- O, k; s
- let frc = Resources.getFontRenderContext();2 X. ^# j: @0 v
- bounds = font.getStringBounds(str, frc);( _- q+ U0 u0 j6 J
- return Math.ceil(bounds.getWidth());8 o4 R t( @0 p; i# s9 p
- }" v" ~3 B: Z3 j% u3 D
9 C W6 F. S- {# k- da = (g) => {//底图绘制
; R( U7 g5 d+ j - g.setColor(Color.BLACK);
; k5 [8 x' I t y - g.fillRect(0, 0, 400, 400);
6 B: k; _1 B7 {# ~! { - }* c; W* B& v. E$ u3 S
- 8 q- S- q* r) y4 }7 \# `- F
- db = (g) => {//上层绘制$ W' ?" M2 ~9 O8 ^6 G) Q
- g.setColor(Color.WHITE);$ p' v# I: q$ T: c2 Q: w
- g.fillRect(0, 0, 400, 400);; H" q4 F8 g. I- n4 I! G! d
- g.setColor(Color.RED);2 B2 B- }3 ~3 @, @% d
- g.setFont(font0);
+ o8 `; F. I# L4 a) m/ Y5 m - let str = "晴纱是男娘";
8 y" j7 p r A, W$ N y - let ww = 400;
3 |& W6 G7 g7 u! Q - let w = getW(str, font0);9 T- h1 i3 G# Z9 H4 A% B( I
- g.drawString(str, ww / 2 - w / 2, 200);/ ]- w1 f; q! \
- } Z; `/ c/ ~" z$ k0 A; g
- - R( P2 J l3 t( e- C
- const mat = new Matrices();- W# m9 i4 ?" A! @" N9 M; P3 W
- mat.translate(0, 0.5, 0);! q9 a: ~* @' a
- - y. E ^0 @) {/ W
- function create(ctx, state, entity) {* e- r/ ~/ d* R; t- n# P: J
- let info = {
. R6 B- K$ T4 b6 _/ W. m# _ - ctx: ctx,
& i" H; P6 a8 ^% z - isTrain: false,; m; R) N7 F/ h! n, S8 w0 n% W1 a
- matrices: [mat],% |& b \# t3 s7 e" G" a* ?
- texture: [400, 400],
$ K0 F6 D7 j8 L - model: {& Y) }% V. G, |/ b6 O2 X7 u% ?
- renderType: "light",8 q! n" k9 v8 ~7 k6 i
- size: [1, 1],
; e8 t# R7 K! |. W, V - uvSize: [1, 1]7 c" ~* ^$ [/ R% j
- }/ F/ G' U3 {; `- C. ^
- }: x- d0 U# D3 X5 W
- let f = new Face(info);/ J) v8 G# ~$ H/ Y G
- state.f = f;
5 I. ] l& V9 c. v0 _5 K) f& c
" |4 E [+ A% M3 o* }- let t = f.texture;
8 e# J m& ]6 F {+ X& t6 V1 [7 q - let g = t.graphics;4 q+ V* t: `; _0 I: E( F
- state.running = true;0 s2 S% n; {9 r: ~& V5 K1 r) j# W
- let fps = 24;4 Z) ]! T4 ?$ e$ Q7 E/ o" k
- da(g);//绘制底图
: Z/ ~6 c/ `8 g" I9 e& G" } - t.upload();
$ R3 _( m8 ?/ m; w0 v4 g7 B2 Z. f - let k = 0;0 F! T2 Z$ ^# ~: K- R
- let ti = Date.now();
# u2 W% g' A' `) ]' Z0 X& d - let rt = 0;/ z9 d, x0 U4 D9 H4 ?" N
- smooth = (k, v) => {// 平滑变化
: b$ K( S' o) l L; K$ [. C/ g - if (v > k) return k;% L+ p+ ~* [& J( p9 n3 e
- if (k < 0) return 0;1 v/ U0 v" z; N- _
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;2 \5 W, c' V+ Z$ k" l3 P! l
- }# M4 i% A1 g4 r6 ?) ~1 K' B
- run = () => {// 新线程
- w- X" W$ Z. ~5 y$ ]; J' A/ \ - let id = Thread.currentThread().getId();3 {. B( g* v' ]0 B3 `4 x4 Z
- print("Thread start:" + id);& d, W+ v1 [3 ~7 }5 J4 M
- while (state.running) {; r n u5 @4 b8 v$ v D
- try {$ [, f, {: }* T6 {# {
- k += (Date.now() - ti) / 1000 * 0.2;
% T4 Q! w( w8 k; F - ti = Date.now();5 Y2 U$ J0 U, Y9 U! k) O7 i4 b/ W
- if (k > 1.5) {
+ V' Q. S0 X* `9 @% h+ h - k = 0;6 v( }2 a! p% g5 v6 i t9 b
- }
3 B4 @) v9 ^5 ` - setComp(g, 1);3 }( V. E/ E5 d6 I% d
- da(g);; K) a+ l d/ f Q5 T* N. V
- let kk = smooth(1, k);//平滑切换透明度
- K$ s; m4 D; O& O - setComp(g, kk);: k; C! F: b7 a5 n
- db(g);
& H) V1 G! F! o5 P( {, e( E - t.upload();+ A# A2 [$ c: m- I% S h
- ctx.setDebugInfo("rt" ,Date.now() - ti);
0 D( x }' [; S% ~ - ctx.setDebugInfo("k", k);
1 C9 L! Y% ^; i8 { - ctx.setDebugInfo("sm", kk);( I+ A$ V; @! {6 [5 i7 S& }( Q
- rt = Date.now() - ti;1 O3 i+ z: k# ~ B8 M# d& d
- Thread.sleep(ck(rt - 1000 / fps));) V6 H; g$ i) ]
- ctx.setDebugInfo("error", 0). a; P- b1 T! i( S4 x/ c
- } catch (e) {
3 i' V' r2 ^ P* ` - ctx.setDebugInfo("error", e);6 K D: a+ l% \+ i$ L: V
- }
" g- `6 o1 s$ @. U% C8 R - }
, Z3 A0 v1 e% W* o! } - print("Thread end:" + id);1 Y# E" O2 o% _% F. n
- }3 Y; c# x& d- H" M1 O: H+ v% m) D
- let th = new Thread(run, "qiehuan");0 }6 N/ g+ t% K- Y& I1 _
- th.start();
+ ^ C9 v+ d: \" p; [3 p' J - }
; X* y% M0 z* q8 X9 r, y# W
1 V' b2 ] c# a$ z o E7 \" r- function render(ctx, state, entity) {
% Q! W+ @5 B8 k - state.f.tick();9 L' g1 d9 I) J( E" |
- }, H; F4 L& S. G7 s& f
- * a j" S y9 n2 `! m& w
- function dispose(ctx, state, entity) {0 l5 c/ l, [. O) w( u2 [7 H
- print("Dispose");
! l9 E* E. f) ]/ Y# I! m2 i - state.running = false;: d* E4 E, U; S( k) O
- state.f.close();; H; H' Z: {3 p6 @* Y0 D1 E P
- }
# a/ i/ K1 {6 n3 ?6 V7 C; M - # U& s2 \ _% V9 w. u: K. E; l0 `7 ?
- function setComp(g, value) {
7 v. a6 n* _. [4 U# R" X" f Z2 I - g.setComposite(AlphaComposite.SrcOver.derive(value));8 s; ?# W4 K. R% e/ v9 ~9 v
- }
复制代码
! `" e$ `6 j1 M' [5 B2 |* |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。" D" I/ \( |& B% ~# n
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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)% R- j6 r2 v9 e
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