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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。
/ w6 y/ c# m C% M: u- importPackage (java.lang);" E; E! \" x8 F& P b' h1 `
- importPackage (java.awt);
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- include(Resources.id("mtrsteamloco:library/code/face.js"));
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4 Y1 _3 E9 b H; Q" B- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
+ L) t. t1 s3 T: b
/ q# W! Y) ~; Q6 ~5 y0 }8 }- function getW(str, font) {0 o' h, e F: Y; s$ s* d! U$ X/ J
- let frc = Resources.getFontRenderContext();9 \/ m% p9 z+ e a1 J D' i
- bounds = font.getStringBounds(str, frc);5 A, V8 a, z4 b1 ^( J8 {% x0 |
- return Math.ceil(bounds.getWidth());
6 E. Z j+ a: j ~ - }
/ O# r* z6 K: Q& M3 b( h' ` - ; E% \5 B* K( L0 s( o0 R
- da = (g) => {//底图绘制
2 h" G' z8 U( `( e4 I1 F6 [ - g.setColor(Color.BLACK);% U! ?- `- H+ H1 }6 S
- g.fillRect(0, 0, 400, 400);8 l' [9 t4 j1 J; E1 u$ Q& @
- }
9 f! u: Z' c# U/ v3 a6 Q6 ^ - / S% K9 F) {7 t- e4 `$ O# F
- db = (g) => {//上层绘制
$ y+ j, i5 B+ }: H - g.setColor(Color.WHITE);
& D c# f3 l' ~7 d - g.fillRect(0, 0, 400, 400);
) _; L5 @& i. e" ] - g.setColor(Color.RED);
: i% N+ a0 P4 p - g.setFont(font0);. z/ Q' p# W7 P5 B9 e6 @
- let str = "晴纱是男娘";
; T0 i& U0 X5 r4 n) ^, p9 \8 ~ - let ww = 400;' j# h: \8 z2 e
- let w = getW(str, font0);
8 s2 \# m6 p6 F* f6 x) H - g.drawString(str, ww / 2 - w / 2, 200);7 W+ z* G6 O1 Y
- }
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- const mat = new Matrices();
# h& x; T, B4 q# m8 E3 t# G - mat.translate(0, 0.5, 0);$ z2 ~# [2 M# Q
5 k" g6 c: G9 J/ p- function create(ctx, state, entity) {: u& ~) e. M p
- let info = {
/ N! @& Y3 J" T/ y* U% `( D+ a) R - ctx: ctx,
# s8 M2 a% U. k" [! @5 h' j - isTrain: false,
6 J" T4 F% N& H+ ] - matrices: [mat],$ ^6 D( M2 r% P8 v+ R! h% U! b8 f' _
- texture: [400, 400],0 j, q# x% X! d# ]
- model: {% F) ^/ g M- z
- renderType: "light",
$ A/ N' H5 K$ q: w1 F - size: [1, 1],( o& I- Z$ H0 a
- uvSize: [1, 1]
/ U( r1 J) H6 d( } - }
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- let f = new Face(info);
- r0 n- I6 |0 [$ i6 N3 Y - state.f = f;
+ o8 w4 X+ d8 ]; [# C4 H. ?% x
- p/ @$ i1 Y* X1 j- let t = f.texture;$ N; g2 ]; d( k% T! V1 {
- let g = t.graphics;
7 G6 @+ U7 h4 Y* m. M, M5 L2 J - state.running = true;
, G. s g8 w: Z- i - let fps = 24;+ @% ?8 g' _3 e1 X6 t
- da(g);//绘制底图! ~8 w) G0 r! M
- t.upload();
; ~! x' Y" j5 S; B( p% B* I& J - let k = 0;& o, r5 F! E$ {0 v, [5 m) H# H/ ]
- let ti = Date.now();8 s' ^' p! p. }( @5 K* N# `
- let rt = 0;
$ U1 I: y+ D; t. |, _ - smooth = (k, v) => {// 平滑变化
% S. W$ Z. P. d# h - if (v > k) return k;5 `4 [9 X$ n- H; ]! f; X
- if (k < 0) return 0;
+ r3 X. b# U% }( N! E - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;
4 a( h' q" ]- a - }7 [, P& m4 Q" h q, M: f1 _$ }4 x
- run = () => {// 新线程
9 t( c/ S, }9 M1 [$ w- A - let id = Thread.currentThread().getId(); w1 j% j0 q# O) P
- print("Thread start:" + id);
3 t. ~: [( A; i8 k" P8 S( M1 t - while (state.running) {" Q# j8 ]# s9 M
- try {
8 e- Z) k r% r# S/ g - k += (Date.now() - ti) / 1000 * 0.2;
& ]0 t' z& V; v# S' i - ti = Date.now();
j6 j1 [3 `% E/ K7 f* ?2 o - if (k > 1.5) {8 h4 L2 q, B- I0 q
- k = 0;! Q4 W9 x; n+ ^1 F( H! j% A8 p- v4 F
- }
9 Q% O9 _1 P* u0 G - setComp(g, 1);7 u4 s" \5 P5 @$ R( i2 \
- da(g);
+ n" ^' H3 R% `4 n* I - let kk = smooth(1, k);//平滑切换透明度
6 N) a& y- c3 o9 Z - setComp(g, kk);1 r4 M0 v) B$ ~* _/ }' G" S
- db(g);$ A0 Q! c, I( E4 ]) {( d: V& b
- t.upload();+ b- g2 E$ Q9 z' n% q1 c0 W
- ctx.setDebugInfo("rt" ,Date.now() - ti);
2 p, N) `2 d4 T- F - ctx.setDebugInfo("k", k);
9 J% p1 @/ z& L4 \7 t" ?0 q* U - ctx.setDebugInfo("sm", kk);
- ^: Y: X( B/ s3 Z& e - rt = Date.now() - ti;9 K2 S/ X- |+ _) h; V# x& O
- Thread.sleep(ck(rt - 1000 / fps));
" A1 j0 T. N- z) a$ ^) L V u - ctx.setDebugInfo("error", 0)
- I$ s" t) P! T/ {# a- n - } catch (e) {" L& M4 |6 N& G
- ctx.setDebugInfo("error", e);9 W8 Q' j9 m/ \& t, N$ U* ?, l1 X* z
- }
( A/ m% @# a! L+ t" [ - }
1 Y% n! Q1 X( q: S3 c - print("Thread end:" + id);- X2 j" W) v% h/ l* N* ?1 o% U
- }$ Y5 j3 X8 y+ i9 r$ K' a* f5 @
- let th = new Thread(run, "qiehuan");2 c( n2 X6 [5 N
- th.start(); n C8 M7 N% X5 H8 r
- }
M/ T: m) ~: B) |! W4 j7 ^: \
- J) ?* v5 T+ S, P3 v: Z x. S+ T: O- function render(ctx, state, entity) {
/ ~# f1 r" G8 w - state.f.tick();6 d6 `! K$ n' C. L5 H
- }7 M+ a* v- |$ U7 F( e3 k' [3 b
- - \ ^! r; Y0 \' t) ^
- function dispose(ctx, state, entity) {
* A9 L5 b$ n* {; d+ u5 s - print("Dispose");9 ^/ W# A; J+ M* n
- state.running = false;
2 e0 o0 G: l, g6 v - state.f.close();$ i ]8 a! ^6 w! N8 X
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: S; X1 `. D6 [/ i' J' I- function setComp(g, value) {0 J( D9 y+ M$ d- a" T% E
- g.setComposite(AlphaComposite.SrcOver.derive(value));
/ g2 a2 G& j5 p8 k. h - }
复制代码 - s! J5 q& h& l1 d7 K5 L3 d
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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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 z2 ?+ |/ H) J* f
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