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* w4 H2 E n8 b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。
) o+ t) g# R( A- importPackage (java.lang);
) W4 ~6 c- {' m6 \$ H - importPackage (java.awt);0 ^/ |5 S5 P: Z
- 2 V2 S5 {5 j5 L- C5 ~
- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
4 C( T8 y7 K5 J8 d! { - / [$ o' e- I. X- f% ~: \
- function getW(str, font) {- L0 I2 B& j1 f+ p
- let frc = Resources.getFontRenderContext();
8 r- c" E$ C7 `2 G# W - bounds = font.getStringBounds(str, frc);- }: |! P9 O' r: Z, k6 x
- return Math.ceil(bounds.getWidth());
% {% a; \, M8 G8 j - }' l( E* `6 E3 [0 ]) V5 x2 C( l
6 y7 x+ P H7 C- da = (g) => {//底图绘制7 m- W) s" w6 K) H! n
- g.setColor(Color.BLACK);6 l% O3 u" T8 ]8 r+ s b: L
- g.fillRect(0, 0, 400, 400);/ U5 W' C7 p( o1 e9 k
- }$ t. V% [8 Y( j. d
- - J# m1 q4 g. o5 ?5 n- n' Z; X
- db = (g) => {//上层绘制
8 U( @' J( [/ L - g.setColor(Color.WHITE);/ L' k+ [6 d: i1 e
- g.fillRect(0, 0, 400, 400);
1 \0 G# ?% z* e" B2 K - g.setColor(Color.RED);- `: _; x# f( j
- g.setFont(font0);
9 X' g T7 U' R) p2 }' c - let str = "晴纱是男娘";
5 N& C( @( E5 v; z% h2 u( d - let ww = 400;7 m. L" i5 z- T9 e- F3 L
- let w = getW(str, font0);
; l, J& w8 y# A& L; Q% q7 { - g.drawString(str, ww / 2 - w / 2, 200);
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( l9 T1 w5 F/ d% h( H. P1 C7 ^- const mat = new Matrices();3 C. `. Z n6 i+ x* b& e
- mat.translate(0, 0.5, 0);
7 T3 J q! U2 K
/ w7 P4 v# M/ u% ?" Y- function create(ctx, state, entity) {
3 `8 k2 T' @. f- V+ l9 Z - let info = {
) |5 k8 b2 v5 b1 \ s - ctx: ctx,* S1 F$ ~6 U' f( p- S* S
- isTrain: false,# O* y- l4 G+ C$ u% u: D( ^8 `
- matrices: [mat],
+ `) S4 g. H1 n7 Q - texture: [400, 400],
2 S* y$ {# `) L6 o& B - model: {' f! ^( [5 q& n1 w
- renderType: "light",
, }+ _1 U1 J! Z9 N. |( G - size: [1, 1],
' q- T# P$ u' [3 \; f3 I - uvSize: [1, 1], {! H) }# M0 P) D1 D7 A
- }
* h, n$ d( A) ?; b/ `" s6 R0 c9 t- W$ a* W - }
- r5 H2 L; [7 b9 v - let f = new Face(info);/ |3 M4 u. q' h2 \; e
- state.f = f;
1 J% K* c0 \7 k4 n* c# ?* e
' ]1 f" d& u. m! m: I6 ^* n% W8 E- let t = f.texture;
2 h( P2 T! ]4 z( w0 H0 w, H" k1 H - let g = t.graphics;
1 Z" [5 t, g6 |/ ?. ]3 |7 ?) s' T7 O - state.running = true;
1 k4 N: B1 f# Y6 N& n; G- f1 R9 |# w! O - let fps = 24;
/ h$ v2 D7 h. h$ T7 w! G U' Q - da(g);//绘制底图
) F2 X1 g: \8 h( b - t.upload();
5 j) q# |/ y5 s7 K% S) e9 [ _ - let k = 0;
! F4 o S9 }# F, m& i - let ti = Date.now();0 l, p, H2 p& u. ^
- let rt = 0;
( E, C3 d7 o W& | - smooth = (k, v) => {// 平滑变化
6 s: I; l" q( o5 k; X1 u - if (v > k) return k;
) t" f n2 _: t& G; R1 \" u9 b - if (k < 0) return 0;7 }; A" t6 F! |% w( U" i' Z
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
1 S0 j' h5 z& t - }
. {6 W+ ` L1 Z& S - run = () => {// 新线程7 y9 H/ D3 B3 Y
- let id = Thread.currentThread().getId();
. l0 Y7 F( b5 n* A5 M7 c5 p - print("Thread start:" + id);, D) Z4 a5 n6 ]& W! I2 `4 {+ h
- while (state.running) {7 l. g$ ~) W! n: o H( \* K
- try {
$ p" |5 H* A( v5 e - k += (Date.now() - ti) / 1000 * 0.2;" [# R1 ^% e9 W) h! ~( R
- ti = Date.now();( N* ?8 w6 T7 S! {2 R! a2 W4 i5 c' {% h
- if (k > 1.5) {
! l7 I' n. Y. ^1 I3 B. l! m - k = 0;
( ~: K+ B6 z; s- Y4 g" ? - }
! \% o7 w4 z& \9 f* l$ Q8 Z - setComp(g, 1);; y' T& r% L4 S& N" q* w5 U
- da(g);
+ {/ G- Y5 l, I# D - let kk = smooth(1, k);//平滑切换透明度
% n6 F6 B, N6 N7 y: W" t - setComp(g, kk);- J7 E% ?% i( g0 o5 Z
- db(g);4 j, \8 i) L# [' Q- @* T- H" A: i. ?- I
- t.upload();$ @+ Z0 g5 G3 e' R4 @
- ctx.setDebugInfo("rt" ,Date.now() - ti);7 d) k/ n8 j9 G1 w7 R) d3 X$ x
- ctx.setDebugInfo("k", k);& D6 z/ ^: E: u
- ctx.setDebugInfo("sm", kk);
! f2 G; i( F2 A - rt = Date.now() - ti;9 `, X4 r8 b3 Q9 Q2 ]/ @+ ~
- Thread.sleep(ck(rt - 1000 / fps));
9 w G( p' t: o* ^7 E - ctx.setDebugInfo("error", 0)
& H v# S/ ^/ o A* \ - } catch (e) {
, p" b: v. I- u$ Z0 M1 U6 ~2 \# k# z - ctx.setDebugInfo("error", e);# B7 Z# p5 |: D% H! [
- }8 ^# ~; c8 E& j4 J$ \' X
- }
. E( b( O- l8 _ X& E- P - print("Thread end:" + id);
! H# u3 M7 x. e - }
, v- l/ I- r7 A7 j% ?& u7 w- K - let th = new Thread(run, "qiehuan");" D. C! e h$ s: U, Y
- th.start();
) g$ p% ?; N( Z! c, N! { - }
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- function render(ctx, state, entity) {
: }3 v: p( ]" |+ H6 q - state.f.tick();
3 }# k2 o$ z' F8 u# K - }
6 b1 |$ I3 x) w+ h4 A - 7 I. s5 w5 `- A5 O2 h4 D+ D
- function dispose(ctx, state, entity) {( p% C2 F+ j' `1 P9 ]7 a) R
- print("Dispose");
- H% _ T; O, ^: ~: E - state.running = false;
; D& \" h& F# w# m - state.f.close();
0 s) j3 m3 A3 f, N# J; m6 Y - }
6 r9 L1 i" Q- z/ c, `2 }! K' a. W - 9 ?5 e; M, q# f( W5 @ n5 K# v
- function setComp(g, value) {: v' f0 l( I; F7 o3 H9 p
- g.setComposite(AlphaComposite.SrcOver.derive(value));
2 R& S7 D% i% Y: Q( f - }
复制代码 x* ?: s; h0 z. p
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。
% v( g: z( j9 v5 v& A) W2 r' D7 i" z& e% u! p& A% O+ Z* l
: p! N0 N! q- k& @* s9 k顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)7 n$ v! x" w7 B% n/ W
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