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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。
: m4 c4 |" j8 U' w1 N8 e- importPackage (java.lang);
- Z+ b3 Z5 f; v - importPackage (java.awt);
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, Z/ s8 \& O: O) E( m0 C- include(Resources.id("mtrsteamloco:library/code/face.js"));
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9 ^" @$ o: m e. m8 v) X. E5 e( o- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);+ u, h0 ~% H- w4 `3 S2 o3 z" e) _/ b
& Q1 }( V! A! z, y- function getW(str, font) {8 T+ i& X: l9 F2 B- T+ ~" j
- let frc = Resources.getFontRenderContext();
6 T- r7 p$ S- ?# \ - bounds = font.getStringBounds(str, frc);
3 A! V0 ] \! S7 X; T - return Math.ceil(bounds.getWidth());0 b* w( n9 M5 e! [$ n/ V- R
- }
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4 {2 l% }7 G8 \( k- da = (g) => {//底图绘制- l9 q$ `( Y% ~# e7 L0 |
- g.setColor(Color.BLACK);9 n+ z0 q3 F" t# i+ V
- g.fillRect(0, 0, 400, 400);
( i5 S4 Z3 ^3 `: W; F3 [% | - }
8 `/ b- h, o# b4 V9 j - 8 I" {% y# j4 E( m, B0 r# T$ u
- db = (g) => {//上层绘制
/ `. t! H. E c+ V2 ` - g.setColor(Color.WHITE);" n, k/ n2 z* L' P2 c
- g.fillRect(0, 0, 400, 400);9 G5 W% P E: J: z; i- `9 D
- g.setColor(Color.RED);) m: b' D- Z. Y" F, x
- g.setFont(font0);
) A5 t! J; k: }. e - let str = "晴纱是男娘";0 x, G# v' `) U! }) P: j% s
- let ww = 400;! i8 s2 P, h2 C0 R/ ]! ?1 x* o+ F g
- let w = getW(str, font0); d9 m5 a( Y9 F$ {" g
- g.drawString(str, ww / 2 - w / 2, 200);
" s7 y# ]2 @) }" m: y1 M4 ]8 w: Y - }
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- const mat = new Matrices();$ H9 B4 @: @: `6 k" d" L( t
- mat.translate(0, 0.5, 0);% O# F) B& N" e5 \2 I
- ^ A7 R7 i* D/ H& b
- function create(ctx, state, entity) {
M3 N, C- X9 U - let info = {3 h7 o8 P# \/ V2 L% u3 C
- ctx: ctx,
, D2 |; ^7 [# d& D( ~ - isTrain: false,1 F5 y6 D0 C/ L" o* V' H) \8 Y
- matrices: [mat]," i3 \8 p/ U, h+ d- N
- texture: [400, 400],
2 i' ]& Y2 z8 [5 b: S7 X. b/ E - model: {
* B' E& k. U# _4 t$ | - renderType: "light",
( I0 `: U1 A. b" U - size: [1, 1],
' q$ c9 E( |5 O' v - uvSize: [1, 1]
" V T9 A6 h) `( D8 D# r - }
/ G: ^+ O0 w# G7 G2 Z( g: k- Y0 D - }7 F6 p1 t- C% M! f
- let f = new Face(info);! G+ @% o# q* a( P3 p$ J
- state.f = f;" f* K/ U- `$ I. Z( d9 B' L+ z# v3 \6 y
6 t& B. h6 ?6 @- let t = f.texture;
9 ?- P, C$ W3 [9 T) }5 H% V4 w! B( ? - let g = t.graphics;4 w5 [: b7 X* Z) w
- state.running = true;
- K3 {9 Q; A" ?! p; j" b8 P - let fps = 24;6 {2 ]8 C. {) c
- da(g);//绘制底图# L$ e5 O* @" J0 }( P1 O( `
- t.upload();
0 S7 s7 @& P% Q# E - let k = 0;2 ]3 x2 A4 G4 t/ v
- let ti = Date.now();3 B1 T8 V& _. E5 W; C$ q! r
- let rt = 0;% t, v1 @7 m/ W3 R3 r, l3 }( w
- smooth = (k, v) => {// 平滑变化
# ]8 i: S7 ]. h+ x W% h, K. r0 |# } - if (v > k) return k;4 W: k( G. Y" S
- if (k < 0) return 0;8 O: B+ X* S; K) g: w5 D4 n
- return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;1 M4 m- k* ^/ U! |1 _
- }
1 E& u3 C" y D4 b - run = () => {// 新线程
/ u/ F( @7 C- N1 H4 g5 s5 R. T - let id = Thread.currentThread().getId();( p) M6 X, \1 I. D8 E" t' n+ Z
- print("Thread start:" + id);
4 \5 k" g: f( l) B7 x* i' H$ k - while (state.running) {* \' C2 b& b( j% e1 ~
- try {
, b2 g- j+ B& u - k += (Date.now() - ti) / 1000 * 0.2;
7 D3 n! l8 m' M0 ^4 ]. ~5 Q - ti = Date.now();& V& ]" O: n8 i: [
- if (k > 1.5) {
, K- u; v: S- S* e- q - k = 0;# r* O/ a- h7 P! G; h7 U
- }4 l1 N$ ^; X0 v. C6 Q& P2 w. \/ D
- setComp(g, 1);
: V6 `4 L' _6 `& P- e8 L# d - da(g);
4 ?* Y/ D) ~0 Z2 k6 O - let kk = smooth(1, k);//平滑切换透明度) y5 K T: T- u V: J- e$ o$ L( ]
- setComp(g, kk);
2 @$ |3 s: z' F( ]( ?5 ? - db(g);
0 d+ X0 N2 M7 F9 m. I - t.upload();# p$ @! |% u) ] h
- ctx.setDebugInfo("rt" ,Date.now() - ti);5 L; c3 Y7 g5 i8 e* {
- ctx.setDebugInfo("k", k);% X! z2 v- d! K) Y- f
- ctx.setDebugInfo("sm", kk);
) t( g+ E$ x& e, ~ - rt = Date.now() - ti;* Y8 }5 W$ g0 x) D' W
- Thread.sleep(ck(rt - 1000 / fps));
$ q' l# b$ g2 F) u- K" J9 y - ctx.setDebugInfo("error", 0)
$ b7 ?2 I/ S$ K5 {" X% z - } catch (e) {/ J+ r/ y) T$ _( S2 A$ S9 C9 e
- ctx.setDebugInfo("error", e);" b$ _0 |# {" W+ Q
- }# j7 r. E# a: S% a6 I
- }" v' ~# z9 S8 W Q7 H' d( | @* `" k, N
- print("Thread end:" + id);
' o* |) X7 R0 I4 F - }
* }! V; [ ]3 P' M9 P3 O7 X: g - let th = new Thread(run, "qiehuan");
. y: p8 F$ k' x9 l/ T - th.start();
" @4 ^) D5 ^4 q+ \+ C/ m3 ^+ g - }
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- function render(ctx, state, entity) {. `$ r0 J6 E- O: v
- state.f.tick();
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- ; E& f: R9 f5 I$ N+ }( d
- function dispose(ctx, state, entity) {/ w" U) s% {' }, @: F B
- print("Dispose");4 f3 S' y8 `. k& \9 V
- state.running = false;. P" D2 r+ z' f" T
- state.f.close();% K% l- v% d% Y1 Z$ r
- }' K0 K9 H% k6 k
2 ]; u# k* A: c& |1 L- function setComp(g, value) {
5 u3 S0 l! ]) u' D7 L+ S9 T - g.setComposite(AlphaComposite.SrcOver.derive(value));
' ^: s- L* `; y; m5 c. N3 T1 Y - }
复制代码
+ a. Y' e$ B! b& s3 n: f) s& _; 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。2 J: f- N" J2 r& a
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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)# F, c$ _, q$ a3 l
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