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. U8 M% J0 J* W C" J6 K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。
; D7 U; ]" }' b8 z- importPackage (java.lang);
X% j5 s7 m* H% L+ q# q - importPackage (java.awt);3 ~! Z8 A! b2 T( q5 Q
7 f2 t/ C# F: \0 p' e" t4 B- include(Resources.id("mtrsteamloco:library/code/face.js"));# g5 i+ U8 w/ j! f$ C2 C
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
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) C S9 |7 ^- r% b; n) Z) l- function getW(str, font) {
2 ~" l4 O( h7 R: [ - let frc = Resources.getFontRenderContext();
) d5 U" L: ^' B1 H; F+ z - bounds = font.getStringBounds(str, frc);
h. ]6 [2 [) U" ~ - return Math.ceil(bounds.getWidth());$ E7 g3 R% V8 G% b" l# c6 J
- }7 F: U$ C- A) y3 ]
- 3 Y# g6 f. ]/ \( D5 U5 Q9 l
- da = (g) => {//底图绘制+ a4 {" A8 K0 O/ K1 s
- g.setColor(Color.BLACK);
2 K3 u9 E, F0 Y P# [5 A5 i - g.fillRect(0, 0, 400, 400);
& `! l6 Y0 }$ `2 ^8 \ - }$ B) Q7 S- i0 _$ O9 k
w/ _3 \) I* B6 w) Z, O0 a" u9 \- db = (g) => {//上层绘制
* d1 m6 C/ Q% @ F - g.setColor(Color.WHITE);3 n3 o+ O3 e" t# K( O' {6 W6 S& W
- g.fillRect(0, 0, 400, 400);
$ }& N+ X {) N$ B6 I0 b - g.setColor(Color.RED);
5 Q$ a6 H8 r+ \$ D' i' o4 I6 ? - g.setFont(font0);
$ w) a/ v+ K- I5 d+ l( o - let str = "晴纱是男娘";0 \* g; M U" D- f9 P! _7 w
- let ww = 400;$ b F9 R, v' n* r7 d& `
- let w = getW(str, font0);) D' H$ j6 P ~7 P, E( P" s. ~
- g.drawString(str, ww / 2 - w / 2, 200);
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7 r. `) u# M0 X) e3 r" h6 }3 U4 | V8 u& B - ! o7 o+ i% w* c3 s) q
- const mat = new Matrices();
c# l. S( n8 a3 X2 y/ v/ T - mat.translate(0, 0.5, 0);+ q- L* w$ z J
- $ w2 Z1 F3 c" O3 g$ _) z$ D( w
- function create(ctx, state, entity) {( Q y1 Z$ e+ M6 k7 V
- let info = {' D$ i3 Q! w0 S1 E) C' D7 i* K
- ctx: ctx,
" w' |1 C7 R( S y3 @, V# u6 F - isTrain: false,
. H' R, ^8 l: L5 S' V' _% t7 Z1 ~( Y - matrices: [mat],8 E, P, S* r$ W. m# m* }% v: p; s
- texture: [400, 400],
& N" ?( I/ R' V' W1 K* B - model: {
7 B( n& J, {: B- \- C7 Q" l x - renderType: "light",- F4 L& f' v8 ?6 W4 K) O- z
- size: [1, 1],
5 c. r$ J( x4 I% ]% K - uvSize: [1, 1]+ u( @9 k! z; X4 A( O2 G
- }3 V' z/ V) ?5 U, x# @' g
- }
/ Q7 V! G8 z2 i - let f = new Face(info);
! _7 H j& R, r9 ^: ^/ F0 B - state.f = f;
- z X7 Q7 M* y" Z' }9 U
+ I0 L% G! O. ^- C! @- let t = f.texture;. }, ~/ r+ J( G+ Y% A! Y" _
- let g = t.graphics;- o4 R% ], j3 G: r+ [
- state.running = true;
# T+ T; k1 ]# r9 | - let fps = 24;, o6 ^6 u7 ^( e' L8 I
- da(g);//绘制底图1 u% k3 A" L% f4 g& O8 v# j3 t+ q
- t.upload();
- u. G# x! D! J) @& _9 ]3 `. ?5 x% y - let k = 0;
% W# @" P2 i0 x3 P- \ - let ti = Date.now();
- L% b+ _% n! D+ O$ c. b- Q - let rt = 0;
7 t7 h' }) T c4 K- H1 l* u( s0 v1 J' z; A - smooth = (k, v) => {// 平滑变化
1 g2 f1 ?3 t5 x Z- K" h" {9 ?2 {% Z5 p - if (v > k) return k;
. y2 z) S* b2 m2 h+ m } - if (k < 0) return 0;/ |# P% H2 I% Q
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;- u* G9 S8 X8 r
- }8 m! f- }/ V t; Z5 W
- run = () => {// 新线程9 f2 ]' ?6 H! H. X: D4 ^
- let id = Thread.currentThread().getId();0 b1 a& m$ a9 a }" P& r' m
- print("Thread start:" + id);9 {6 A: i/ T1 q5 o' o# {0 |
- while (state.running) {
' H$ a2 `$ E8 }: \& { - try {
3 ?9 T3 C1 e5 m: q1 E2 G9 c* T" b/ C - k += (Date.now() - ti) / 1000 * 0.2;+ q5 A5 [4 f* A' o
- ti = Date.now();
; L6 ]* |* |5 z+ f. B3 k1 @' I - if (k > 1.5) {1 ^& v$ c: x9 T
- k = 0;
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- setComp(g, 1);8 l7 c6 n7 ]( u( C' L" F
- da(g);
% C2 ?* w1 D) { - let kk = smooth(1, k);//平滑切换透明度* ~8 M+ v8 f' \9 o. G
- setComp(g, kk);! t: U# g/ P* l; {' D$ f
- db(g);
- x+ X% ^+ a: ]% p/ t - t.upload();& X; v2 \: ^9 s' y. Y# ^
- ctx.setDebugInfo("rt" ,Date.now() - ti);* l1 t5 F6 v+ T6 L/ ?0 N
- ctx.setDebugInfo("k", k);
/ A' ^$ X: b& u" j/ b7 s, y# B - ctx.setDebugInfo("sm", kk);, o% m; E, |+ b- h. G4 A8 |
- rt = Date.now() - ti;
" Q9 b! p: j" |+ A' G - Thread.sleep(ck(rt - 1000 / fps));/ N( P* L# Q x: ^( o; W' n. @
- ctx.setDebugInfo("error", 0)
4 X. Q# A' Q. o# C7 Q5 e - } catch (e) {
6 j/ {3 i7 D# @) _. e - ctx.setDebugInfo("error", e);
* i# `" Q* |. q4 `8 f, \2 u& t - }/ E* h5 t& F3 W2 @4 C0 R( Z8 e
- }, I8 z# c) c+ O
- print("Thread end:" + id);
4 _6 o& a* e% ]4 F$ m$ J3 N* o - }
w+ S9 F" X# s - let th = new Thread(run, "qiehuan");
8 \0 l) s- R6 z% k/ `6 H& r5 p - th.start();8 I% s% ^3 b8 W4 A* h# J1 E8 P8 U# A" O
- }
4 T4 b7 N# _7 E. p+ ~7 }6 [, n
/ ]4 E' q' a+ K5 x: X- function render(ctx, state, entity) {$ G; U- `& e& O
- state.f.tick();( X( ^. A! n5 l, e& L$ M# L
- }
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- function dispose(ctx, state, entity) {5 A) k6 [' q j( a, b% [0 ]0 H
- print("Dispose");1 [5 B) |; B& c
- state.running = false;0 g; ^* W4 `; [! q" z
- state.f.close();
8 G/ p! G3 o8 f - }
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- function setComp(g, value) {- m5 {" h& r& a
- g.setComposite(AlphaComposite.SrcOver.derive(value));7 K9 r. I" r1 H9 u% h6 W+ y
- }
复制代码 . Q ^" s1 Q; \
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。' k( E8 D2 X7 F1 A6 F4 _5 _' F4 x
+ |; q" O- u3 Z2 S. c! H0 p. ]# E6 }# ~" j
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 M0 S& \% a( x3 @- z
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