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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。
" f- \9 h# a3 H- importPackage (java.lang);3 G: d$ i8 _) C7 \2 E, C# N4 o, X; e- H/ t
- 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);2 {4 l' `: M# P$ D0 J8 `
# i1 r( W4 s) I; \# c- function getW(str, font) {$ @# d; C9 K' X3 ~( n' v
- let frc = Resources.getFontRenderContext();
& Z7 o0 y t3 x5 t4 ` - bounds = font.getStringBounds(str, frc);
' j2 S" B, d4 P4 ?$ t - return Math.ceil(bounds.getWidth());
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0 U$ g) w; i/ O! E& y- da = (g) => {//底图绘制
- \9 e* V$ j2 C1 {, ?" O/ r - g.setColor(Color.BLACK);
8 `& R/ s* w: P( r1 l - g.fillRect(0, 0, 400, 400);) a6 {( N8 z1 l- s1 S) {
- }7 O$ ?4 I T# Q0 T
$ N$ J& Z2 \, i3 D) g- db = (g) => {//上层绘制
3 E+ ^- a7 H J+ V3 B - g.setColor(Color.WHITE);6 W. p4 ~9 ~8 O
- g.fillRect(0, 0, 400, 400);: N2 w8 s6 I8 U0 }8 y. F) u( N+ A
- g.setColor(Color.RED);) H( p( A9 ^! G- j
- g.setFont(font0);9 p5 L" [8 i8 O. c- v
- let str = "晴纱是男娘";
1 G$ ^. Q# ^$ C+ R$ j - let ww = 400;
: C- R! a4 \; t- V. n+ ~ - let w = getW(str, font0);
4 T" Z/ r* I4 a& f' w( _ - g.drawString(str, ww / 2 - w / 2, 200);: c" i6 B2 u6 D6 i* _
- }
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- const mat = new Matrices();
) e J9 N% y( K+ V2 F9 d9 @ - mat.translate(0, 0.5, 0);
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- function create(ctx, state, entity) {/ I. c! S f# ]& Q
- let info = {
; V" l6 M3 r( e0 i6 u/ ^ - ctx: ctx,% M2 a2 H! ]( r* Z6 d
- isTrain: false,# l- G0 m* O' I6 x
- matrices: [mat],
; t) F8 n; F* R( u! q& h( ^5 B - texture: [400, 400],& ^) O" P1 x0 c5 J c- w/ K
- model: {
" G6 N2 j4 e5 z4 z - renderType: "light",7 M' N# S( A$ y8 J
- size: [1, 1],
% L8 r) S; n7 \2 u: f( l6 { - uvSize: [1, 1]
& ^- t9 J; d- i - }
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- let f = new Face(info);
+ F- I- m+ ^9 D D: C+ ? - state.f = f;
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- let t = f.texture; f3 [6 @9 R. P! E( C3 G
- let g = t.graphics;
5 p0 z( U- D% g3 z! W - state.running = true;
& D3 B' C0 G2 Y( i& L3 f - let fps = 24;7 t I [! n- h9 ?5 c; @7 V
- da(g);//绘制底图
4 O; l9 L* j0 N6 e% E$ w0 y) A - t.upload();% f% p) ]. m g' U( @
- let k = 0;+ l/ g0 z) R6 S! _4 ]
- let ti = Date.now();' B: A* q# s7 h! T/ n. r+ }# _
- let rt = 0;
" i' N2 [# L) n% u% w6 I' x - smooth = (k, v) => {// 平滑变化0 P1 x4 P# n* |
- if (v > k) return k;! U& P) q W! i4 c! y: j9 ^
- if (k < 0) return 0;
# C6 b& R x' m% r' \0 H4 l1 ^$ B# _ - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;% C3 @* p! t9 {9 R8 U& b3 U3 q1 M& Z
- }# O. n& D0 [- @* D Q
- run = () => {// 新线程, Z$ H6 S' p2 g
- let id = Thread.currentThread().getId();% N% [ w5 K1 f ?# l+ t! E
- print("Thread start:" + id);
' I2 J# i* Q( h/ t6 Y$ t( f - while (state.running) {
1 a3 Z$ t3 I' N- i3 m( o* N. L - try {
' A- F L" E0 t! r - k += (Date.now() - ti) / 1000 * 0.2;6 i7 Z3 m3 U1 U6 |7 Y8 Q
- ti = Date.now();2 }4 G5 G# a: Y% D5 M& ]
- if (k > 1.5) {! v2 J/ B4 M0 Z
- k = 0;% _6 L$ U$ i2 q. ]# L
- }
! {* k- }3 X9 T, Y3 r3 }" u - setComp(g, 1);( B3 L* `+ N3 @ Q
- da(g);6 H. B- \" f" }; b' |
- let kk = smooth(1, k);//平滑切换透明度$ V7 i$ z' E2 n5 B( ~$ k
- setComp(g, kk);3 l7 D4 V7 R0 \5 ~
- db(g);
8 g% f1 F6 V6 C1 W) F - t.upload();
. ]! }. a- U4 G* r* J - ctx.setDebugInfo("rt" ,Date.now() - ti);* P* y8 s% B6 \0 h7 ~% l
- ctx.setDebugInfo("k", k);; Z7 L- k& b! q" J
- ctx.setDebugInfo("sm", kk);# T% D6 G% O- k
- rt = Date.now() - ti;
8 `" T6 E7 S, p* x/ ^& D+ z - Thread.sleep(ck(rt - 1000 / fps));3 Y) `( o4 p4 w: [, _. h, M: W
- ctx.setDebugInfo("error", 0)
4 r7 D* ~0 ~5 l# {. v7 \ ?* k - } catch (e) {
% k$ L5 ^' r0 D# l - ctx.setDebugInfo("error", e);
9 [2 Q @3 p5 X2 ?/ C/ J - }
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- print("Thread end:" + id);
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- let th = new Thread(run, "qiehuan");# C# x8 l% r; L$ B
- th.start();4 E1 O2 k6 {- Z3 T
- }8 \* o; K* D$ |1 R
- 8 N3 E9 d% Z6 M/ ^! L$ Q
- function render(ctx, state, entity) {
+ j/ e$ n! B& h8 f% d2 e; h( | - state.f.tick();: P4 J2 _( \0 X; A/ F+ o' t
- }' i9 o0 W, n/ Y9 @, @$ r6 H% T
- 2 k y6 i l/ V0 W: y: c/ ~& x0 [
- function dispose(ctx, state, entity) {. u6 l: w0 B m
- print("Dispose");
5 m4 C3 { F2 f3 @6 C0 q+ A - state.running = false;+ c1 l- H( f: A* f3 j8 ^2 X: m
- state.f.close();
4 e9 M }; f$ b! w - }8 y8 N& Z; o+ V' d% O) n* Y
6 V) `: v) `" r- function setComp(g, value) {/ v+ N9 l! j8 w& w2 G0 S2 q
- g.setComposite(AlphaComposite.SrcOver.derive(value));1 \( J- B- Y, I, J$ L; o7 m! m
- }
复制代码
6 s8 T3 w: i: z; Y. _7 N3 l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。
4 O) u, d+ E5 D: L9 U1 T2 z: Q- t+ z# b7 F: Z+ B
- ?7 K( ]1 l3 L# N! G顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)
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