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! |/ x/ m: ?' 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。
' [0 s5 u6 R# t' R; e9 P9 `- importPackage (java.lang); A) ]" ~$ ?/ u
- importPackage (java.awt);1 ]3 \6 ^0 \$ \( v9 u
7 k8 V1 F2 ?' r+ W) |- include(Resources.id("mtrsteamloco:library/code/face.js"));
/ ^7 s8 x. u; K7 Y% I
) Z% Y1 p& r7 K* T- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);7 L- d g* }, q, q
- 7 K' p4 A2 W# j( o
- function getW(str, font) {
, W2 n7 R3 y7 S4 _5 B - let frc = Resources.getFontRenderContext();# j) m$ U" m$ ?+ t
- bounds = font.getStringBounds(str, frc);
9 C; w9 h, k U/ O. z# X - return Math.ceil(bounds.getWidth());+ I/ p9 x( g1 E
- }+ g: g: Y' c$ _# A6 f( p. c$ x6 R
- ( n" M3 R8 v+ l
- da = (g) => {//底图绘制
" {; y5 l: a& f4 K) ~ - g.setColor(Color.BLACK);
7 F6 }( | C. U2 e3 @ - g.fillRect(0, 0, 400, 400);
. e6 i# Q& l& b7 h% C/ @* a+ h$ o | - }1 I- o; z% J1 ?5 x w |
- 4 O4 p0 b/ D/ t. u/ V% O# q
- db = (g) => {//上层绘制* ]8 M- j% @/ o( n1 s
- g.setColor(Color.WHITE);
{* N- H: y9 V8 n - g.fillRect(0, 0, 400, 400);2 J9 f3 E2 D. T7 _3 V, s) M
- g.setColor(Color.RED);- l, a3 X+ O( A# C
- g.setFont(font0);2 l/ Z8 D. i% ^1 o7 O
- let str = "晴纱是男娘";
) g3 \, y6 [; D8 K - let ww = 400;2 P+ }1 {. i }# h3 P6 Z* m* n2 S
- let w = getW(str, font0);
8 s' t# M- V: n( q9 P0 I - g.drawString(str, ww / 2 - w / 2, 200);
" ?3 } i" Z" j m; T - }
( a3 I3 y+ j# o! }4 B8 h
/ g1 S3 V: s1 k x) p- z- const mat = new Matrices();
& k) i8 W; R/ l( y - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {7 w8 p9 X2 g" {/ t8 r6 R. G! d
- let info = {
5 S3 O6 q8 h! P; v' l7 i - ctx: ctx,
2 A3 ~" _, a7 o/ A* ] - isTrain: false,4 I' I- p% G9 O: U" q, p& f- V
- matrices: [mat],
. o5 B q ]9 o9 u4 q - texture: [400, 400],0 T4 J6 Y, a3 E$ @' h5 j
- model: {
6 t9 I" T7 m2 T - renderType: "light",
0 e. Q8 X) f; ?8 p7 b - size: [1, 1],% q8 Y# f& g4 {5 g) l
- uvSize: [1, 1]
8 x$ V3 j1 m& L6 A; `) ? - }1 Y* H- ^) _; x1 C
- }
* z6 H# d) k& B3 V' g; g J - let f = new Face(info);
2 q6 ^% B- V+ |3 t - state.f = f;$ J/ L# E( l* a; G
0 P) A! ?+ H* s! R! D0 d) @/ V- let t = f.texture;6 z2 t' k. F( a
- let g = t.graphics;& T6 M# z. A( B
- state.running = true;# ^1 n6 U: k% U
- let fps = 24;8 t2 o3 M M( ]( D! Z( A
- da(g);//绘制底图, y0 `* B5 S' n: c. r2 _- w
- t.upload();; ~, C, w s4 m/ ^! F! U1 \
- let k = 0;
4 P3 S3 l6 [+ _9 i - let ti = Date.now();
}. [9 F+ G! Q& H+ Y( r8 d, j - let rt = 0;
8 V- |, c# k6 Y# Z- r* [$ s - smooth = (k, v) => {// 平滑变化
$ m6 e9 \& ~+ }; S0 w - if (v > k) return k;
0 E" c/ F2 q9 c. Y* d* E$ R7 Q: Q - if (k < 0) return 0;
, e9 o6 r p" S7 e- ^/ |2 |9 l - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;! O" t( c% B! x8 ], A0 Q
- }
) M; k9 |2 n" p: _* c u# Y6 `& U! [ - run = () => {// 新线程
; x6 P4 B3 P' S" J3 s! a6 b - let id = Thread.currentThread().getId();+ M$ F2 }/ {) x, A
- print("Thread start:" + id);8 [7 @# x8 r8 x9 P m4 J9 S
- while (state.running) {
6 L y+ V& s9 H - try {- m9 t) P# z% F/ E' [; N$ K4 R
- k += (Date.now() - ti) / 1000 * 0.2;, j/ Q3 w0 `+ i9 g, u+ k
- ti = Date.now();
" p* r9 ^; F* j5 [" T) I$ r- T - if (k > 1.5) {% H) e' ~. Z7 M0 S" L* U
- k = 0;
& e. d, u2 x0 d# Q' N X& D - }: b" K7 C/ M8 `7 z% G6 S8 D
- setComp(g, 1);
: ?3 j2 ?- `& o0 W0 l9 I( z5 F2 K - da(g);
# u; e4 {, U# [/ R( ?% y - let kk = smooth(1, k);//平滑切换透明度
0 o1 Q% o+ i( l, e) f - setComp(g, kk);) h, U5 E1 a( U- D
- db(g);
2 p- u- L/ i' R' l) j" j' T - t.upload();
& H- Z3 f0 P5 _' x x' @ - ctx.setDebugInfo("rt" ,Date.now() - ti);
. o) a# d0 p) t0 _ - ctx.setDebugInfo("k", k);
5 a6 q% O6 w$ Z: Z - ctx.setDebugInfo("sm", kk);
$ ^1 r8 i S" g/ q - rt = Date.now() - ti;$ Q0 i [* {7 g+ x4 {
- Thread.sleep(ck(rt - 1000 / fps));. g0 h4 L3 v2 ?; S% a- D5 T
- ctx.setDebugInfo("error", 0)* Y6 q& N$ z4 l2 I" J
- } catch (e) {
3 T9 `- z6 C2 v$ N7 w - ctx.setDebugInfo("error", e);
$ H4 i: {2 U& c- `; d - }
% i. H1 M' p& G" X c% P - }
1 ` s/ M3 V4 \: y% A - print("Thread end:" + id);, N) v# W5 L9 W- J
- }2 o$ T l5 {! t0 { ?2 W
- let th = new Thread(run, "qiehuan");
, a1 V" v8 {& l1 h3 u& R - th.start();# B/ X" D3 a( i! q R) _
- }; f2 n8 q* l4 `7 q& ?
- 1 @. [* U0 k# f& S
- function render(ctx, state, entity) {
6 W2 O- i; d- F1 W/ T/ { - state.f.tick();5 P# }& z+ }: }3 _$ c+ a3 R
- }. O5 j5 n7 J' Y& [
$ y0 _+ [6 D v- function dispose(ctx, state, entity) {4 b, N7 _8 r& y4 \' d @
- print("Dispose");1 _# H$ ?, H% m1 G9 N+ m# G' B
- state.running = false;
( ]5 }/ Y {9 }! b. b - state.f.close();
" B: `/ j8 s- ? - }; s: i* j A% K" i; X& v
, L1 x: f* Y2 _& g& L( m8 h- function setComp(g, value) {. B/ x6 R) D1 j
- g.setComposite(AlphaComposite.SrcOver.derive(value));" c' L; A$ M5 L9 Y+ P
- }
复制代码 . E; R" ?) y6 z8 T; P/ a5 A
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。' v5 ~3 u9 u* N# K
0 a) d: e$ v! N0 [ ]
9 \1 t) J7 M G$ t! s! |5 }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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