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+ ^+ c6 J) [, W: K# X# i4 g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。
2 D0 F6 a( n3 @, i1 x& B, y! M- L/ _- importPackage (java.lang);! Y0 d# K% @7 |2 ]/ n
- importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));
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- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);& J1 e- x5 w' J
. V, c+ Q* l+ X) A. G- function getW(str, font) {( S* k" x, y3 z! M, o1 h
- let frc = Resources.getFontRenderContext();* M! y9 u: C9 p- s+ L5 ?
- bounds = font.getStringBounds(str, frc);
7 |* Y6 v6 y; q$ u( @ - return Math.ceil(bounds.getWidth());, g% x. E6 J. Z; I+ A! x
- }( K8 N# o I9 G7 {9 g
7 z( z# K7 K+ L* k3 e" {0 l- da = (g) => {//底图绘制" O F, O8 L7 ^4 a' r9 e
- g.setColor(Color.BLACK);# M" Q$ c; h# p& V) i! L1 v
- g.fillRect(0, 0, 400, 400);
. c8 @! E9 ^) _& W - }
; H# J- W# }+ [0 K0 { - / ]% Z0 e# U( h# L
- db = (g) => {//上层绘制0 b- }3 u* H. \, x6 C3 ?
- g.setColor(Color.WHITE);( N( m( S' w% k+ g d/ \# q
- g.fillRect(0, 0, 400, 400);
- W% S) N9 H5 e$ x: r: n- a& C - g.setColor(Color.RED);, \- G3 | W/ b. ]1 d% ]* Q- K$ H8 }
- g.setFont(font0);! u% X* |) M+ `" n& z, `1 L) K9 @- F
- let str = "晴纱是男娘";
( \# u. D* p L& ?1 l: g! R7 i - let ww = 400;
; @6 D5 k# t, x+ V* N - let w = getW(str, font0);
1 B2 Q- a7 r V5 E& J8 x( v - g.drawString(str, ww / 2 - w / 2, 200);
: x' K* O4 U/ ~$ N - }
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* G9 N' ^& N; N1 Y3 o- const mat = new Matrices();& g$ }2 m/ `# L- R
- mat.translate(0, 0.5, 0);
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3 g. ?" ]0 s! f0 j( \- function create(ctx, state, entity) {4 c) ?9 ?6 O' A; `, N# }
- let info = {
( A# U. D1 x, A4 P4 P$ U, { - ctx: ctx,$ U+ ^5 d* s+ v
- isTrain: false,
8 I4 p3 Q5 u4 i- }( Y - matrices: [mat],, M$ |) W: i B0 ]" x
- texture: [400, 400],
: U: K7 T6 S+ C/ r5 I+ T# b) f0 g. p - model: {
( Z, ?4 I+ U$ ]$ l - renderType: "light",
* r1 B$ e8 m( ~: M( W: Y4 }# g - size: [1, 1],9 l- E) j/ u" y
- uvSize: [1, 1]1 G' [1 |! }' i) j) Q8 n- H
- }" B/ p- f0 r; X$ P
- }) g: ^$ k* G9 D5 \: u. \
- let f = new Face(info);
7 E+ ? S( W8 S9 v - state.f = f;
4 E; P: m2 ]4 ~1 h - 6 F Q* P# Q/ v8 \$ {/ d
- let t = f.texture;
6 `! R. H0 D9 T. |/ v - let g = t.graphics;
" Q) t( r; q2 a; v& U - state.running = true;2 M4 r' Q2 ?! @; M
- let fps = 24;
6 F' G+ p9 q7 I/ X7 K: N$ i - da(g);//绘制底图
9 F+ X9 n! s( ?- w8 } - t.upload();+ d5 Q% w1 a& B( w* \+ S
- let k = 0;
5 Y: u3 i3 w# m1 U+ H - let ti = Date.now();
4 i4 ^) ^6 ~ i5 J2 t - let rt = 0;4 ` U6 Q9 n/ O' e
- smooth = (k, v) => {// 平滑变化
7 R& ~2 L( c4 R, d$ ` - if (v > k) return k;
( Q ?! a0 W. Q. J - if (k < 0) return 0;3 S. a0 C' N) U. N4 p7 I( S! W5 \
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;/ p2 o: ~) ~: E2 _. M5 L0 L
- }
& N6 X+ n! D5 ? - run = () => {// 新线程! E! V0 v; c, B
- let id = Thread.currentThread().getId();$ O. E# q5 r+ m C; Y
- print("Thread start:" + id);
6 }$ x# ^$ k9 _0 T - while (state.running) {& Q# @: D+ _" ^
- try {
c8 X' k( w* U$ f5 o - k += (Date.now() - ti) / 1000 * 0.2;9 r. N! e- |9 F1 W2 M i
- ti = Date.now();
$ y8 Q7 J2 [9 }" l- F& k2 y - if (k > 1.5) {5 z! O" B6 l' [; X6 N6 _
- k = 0;
; ^3 P; d7 J7 `1 \, G7 o$ k" o - }
! w, d$ Z( h: h/ x7 K - setComp(g, 1);8 K4 g1 B% w' p$ u" n+ i* n( P+ f
- da(g);
* [1 b% ]! u* D4 k& H# { - let kk = smooth(1, k);//平滑切换透明度& o4 r, Y* P- y
- setComp(g, kk);
$ U" p/ |4 C8 b k2 E5 L3 B - db(g);
6 ?% |8 v0 U" b3 o+ \ C5 Q. l9 H - t.upload();
' ^5 e. R6 p* e+ u9 T" E7 @7 J - ctx.setDebugInfo("rt" ,Date.now() - ti);
$ _' U$ }# Z2 c; u1 l0 g - ctx.setDebugInfo("k", k);
& e# m) ?' P5 G$ i9 ]/ F% J: K; @ - ctx.setDebugInfo("sm", kk);
8 s- W% Q4 F' D: x* q$ E - rt = Date.now() - ti;. P. p. G+ p8 ?, R) e" w
- Thread.sleep(ck(rt - 1000 / fps));; `0 ~: j4 F; {8 O6 x2 l3 m
- ctx.setDebugInfo("error", 0)8 y. s. {+ m' V- j
- } catch (e) {; G6 }$ \7 p( U- g
- ctx.setDebugInfo("error", e);# y0 _; u! I$ b. ]4 B% q
- }+ u2 N, p1 `, ]* [& r
- }3 J! r( r& T* p% x
- print("Thread end:" + id);
& l+ T7 m' ]; a& E* f9 p - }
/ p5 n# Z0 e- H# d - let th = new Thread(run, "qiehuan");
4 @* S c, a( u3 h/ ]$ j - th.start();
' Y/ K$ Q/ U+ e) V - }
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% V& T9 ~# G9 L" v: I- function render(ctx, state, entity) {. F R8 M9 w( u" B! m
- state.f.tick();' O+ b4 {6 d7 t1 F. s' Y2 Y
- }
' [" k! X0 }! `/ t5 v - ; a* [6 Q4 d% S/ D! j9 T; B2 j, I
- function dispose(ctx, state, entity) { `: Z3 q6 k: j. b( u2 |+ ]
- print("Dispose");
7 j9 x5 H% W/ n5 l' h5 ]9 j1 _7 _ - state.running = false;
* J( {/ ~3 f& r( X. o# e - state.f.close();
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5 L# w# A% `% Q; e5 s6 h- function setComp(g, value) {. ]- l+ D" H! r
- g.setComposite(AlphaComposite.SrcOver.derive(value));
8 m* Z+ C) K1 [ - }
复制代码
. F. u0 `. X( N) z" M0 b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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( a0 K! x, I9 |顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)9 T; r' N; i* n% ?
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