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' ?: @! o7 z$ U' o. 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。
. i S' q* c; r# p. I8 x- importPackage (java.lang);
$ C( e4 M& H, Y. o1 |: b# ?" x - importPackage (java.awt);$ c4 v$ F% Z# F, z Z& v
$ d' z w' _9 L8 p% W- include(Resources.id("mtrsteamloco:library/code/face.js"));3 D }; U9 z* h' P
- 6 y' E5 G' f7 h- b9 w; v; Y/ Y' b$ T/ G
- const font0 = Resources.getSystemFont("Serif").deriveFont(Font.PLAIN, 80);
$ p! g) S2 b9 G/ \) D% j
9 Z% H. L! N6 w: \$ I% {$ A0 Q- function getW(str, font) {6 f+ L2 ?0 c' Z5 b+ S6 d) g2 C
- let frc = Resources.getFontRenderContext();
! V# S @! A% O - bounds = font.getStringBounds(str, frc);5 K9 L2 ~. Q0 ]: s, k
- return Math.ceil(bounds.getWidth());
7 S$ _6 R. B( d/ o - }
, I8 H/ X1 O. @; ~$ z/ G
# L; E" ~! C, E5 g1 Z- da = (g) => {//底图绘制
. m& Q. a3 y: }) x - g.setColor(Color.BLACK);
7 O1 T( j' Q4 o1 T4 `5 ?: E - g.fillRect(0, 0, 400, 400);' v* x# {3 O, T* B
- }* N9 a8 y$ B, E* A) F/ ]
- ) N5 S. ?) X4 J( s0 a/ L8 H
- db = (g) => {//上层绘制
; f, G! b) e$ B - g.setColor(Color.WHITE);
& P8 M+ s7 x8 h+ w9 Z: x - g.fillRect(0, 0, 400, 400);
* @" X2 }! @, A5 G - g.setColor(Color.RED);
1 S$ G# ~$ V& X& V1 x) i - g.setFont(font0);
) c8 c; [6 U4 B$ e) A - let str = "晴纱是男娘";* i& H* d6 E* e( ]3 \+ P) W I' T
- let ww = 400;
. o% b; A: e: O; Y - let w = getW(str, font0);
1 c( I5 Y/ n+ [; b, ]6 Y4 q+ a - g.drawString(str, ww / 2 - w / 2, 200);
3 R* m7 P3 v- t! R9 b6 y- j - }# ^2 f6 P5 G9 G I; w7 |
. D% @9 {; s4 u4 {' k( U- const mat = new Matrices();/ W. X# I; r; T$ u& v
- mat.translate(0, 0.5, 0);
1 W$ n- a* n F' Y9 Q7 I5 k$ z c5 Q
" a& r& u# c7 D6 B, `+ i1 r( D& `- function create(ctx, state, entity) {( \5 T* ^8 O1 p2 M- ?) P2 Y$ \
- let info = {: n* d1 S1 s: b
- ctx: ctx,; M- @# \# F# u% \' @, h" V
- isTrain: false,$ t* Y1 t- x9 Q8 U& H/ [ C
- matrices: [mat],( c, y; V$ M; i* A
- texture: [400, 400],; w/ R) k/ Z7 Z1 ?
- model: {- d, Y3 u9 H, ?) g/ u) h, f2 B
- renderType: "light",
, t1 S. r5 X9 y - size: [1, 1],- M& z6 I2 _% R$ R! c8 X
- uvSize: [1, 1]
0 ^/ m; K" t! w - }- G& _* \; L- G: M$ V5 Z
- }" K/ ]* ~" D6 n8 J
- let f = new Face(info);
1 U, f$ x, D+ z4 I# e% Y - state.f = f;3 y: i; D! E5 [# c5 B9 S( X% k
2 p8 W1 R0 R% l+ V4 V( |4 ]/ o, e- let t = f.texture;
3 ^! D+ `4 R5 N% @* X3 Z+ r - let g = t.graphics;0 B6 f9 v) {, ^% ]
- state.running = true;7 d4 Z' R6 q* i1 h9 ?
- let fps = 24;
1 Y* q7 A4 u3 p) D& W - da(g);//绘制底图2 S% u& o2 P \! O, x
- t.upload();
! Y7 r# q# X* a) u& E* w - let k = 0;1 w, `0 ]9 d- f- z2 b. i
- let ti = Date.now();
5 c8 u* T* \5 |( `4 C# Q - let rt = 0;' m! @% Z4 O! u7 h9 a$ I' n3 e. E
- smooth = (k, v) => {// 平滑变化
7 x7 |; m3 M# P, b( j3 z1 G - if (v > k) return k;
( z( J8 E1 E6 S; w6 t - if (k < 0) return 0;
6 I; ~0 i# o6 I0 k- l5 ]/ a - return (Math.cos(v / k * Math.PI + Math.PI) + 1) / 2 * k;& K+ N0 }4 `2 J3 B; ^( V
- }
% x0 @) N% x, p: w [/ C; }2 c - run = () => {// 新线程
: w5 p2 }( I( g3 p/ ?! h - let id = Thread.currentThread().getId(); y) x, R) O# m( p
- print("Thread start:" + id);
% U6 D9 m8 l- k( _9 K+ e - while (state.running) {: \& V! D5 b4 d k1 \
- try {. l0 X/ C/ G" `& X% l3 y j7 F) Y4 H
- k += (Date.now() - ti) / 1000 * 0.2;3 y g) ]1 g% Y, l. G' a
- ti = Date.now();
' R5 X# v) E: v0 p) U6 c5 e - if (k > 1.5) {
; U. @. J$ {$ I7 _ - k = 0;- E. B. e% ]/ p# t
- }
2 g L4 a7 B. Z& T* a - setComp(g, 1);; M. g( q; @" n8 }
- da(g);7 {: h- a* B6 A. N" T
- let kk = smooth(1, k);//平滑切换透明度- u# t( n# r% |# G- q6 ~
- setComp(g, kk);7 @- Y" u6 z/ D0 g) ?6 |
- db(g);
7 F7 E0 f8 ^' |5 q - t.upload();
) e; m" k0 I- A2 D( ?8 R9 C - ctx.setDebugInfo("rt" ,Date.now() - ti);2 _' M2 J3 _# L5 _2 k- i+ X( m
- ctx.setDebugInfo("k", k);2 G" W) c/ z" E! W- J" T
- ctx.setDebugInfo("sm", kk);2 T# Q2 o$ U, Z4 a( `' m: ^
- rt = Date.now() - ti;
# f) O; ]* {) ^4 g( [ n - Thread.sleep(ck(rt - 1000 / fps));
, B8 G& c7 R, h! P" Y - ctx.setDebugInfo("error", 0)
; {# L' b9 [6 s- S/ g - } catch (e) {0 X( n$ w2 a O/ ]2 S1 b
- ctx.setDebugInfo("error", e);
6 j- [$ s8 h" s3 l - } r6 I, Z5 K- B& O# o6 O0 o
- }
, j: w4 \# P) L) H" G; R - print("Thread end:" + id);; F0 v `& K+ w5 y# W
- }# C7 G! t6 W. k5 t0 y c1 d* u
- let th = new Thread(run, "qiehuan");! O" M* D/ t- d. Q0 Y( Q
- th.start();' A& k; {, p6 r' N% e% E
- }2 e* G0 O7 R! v* B! T& Q1 G
2 u2 n7 h5 R* O5 Y9 K+ ]- function render(ctx, state, entity) {
& h: @# M+ p/ T, H9 P - state.f.tick();
! V6 r; x, Z& h9 T3 \: o$ O; G, `4 Q - }
/ X7 R1 x& d# P: f" d1 w - 0 U5 G5 _9 }2 Q% Z* `% w
- function dispose(ctx, state, entity) {
- F2 D8 p* z t+ @0 v3 w - print("Dispose");
* `* c( ]! A9 D - state.running = false;
7 w- p. ]. w; ? K+ O1 C1 R& E - state.f.close();' P4 h% {; i% t( t' F4 j
- }
* e% r; b8 L8 |6 o
0 `9 T2 m/ m/ ~6 E& v- function setComp(g, value) {4 j" p0 [) N Q
- g.setComposite(AlphaComposite.SrcOver.derive(value));$ T2 L2 C5 x( Z( b
- }
复制代码 6 z$ ^. j" \2 ~2 z3 h8 n* J5 v& p
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。( l0 p7 |' k7 c! ~& `; s* _
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" C4 ~' u+ d3 |# k$ p! Q) \顺带一提,完成的时间挺短的,一次是 2 ms 左右(当前情况下)2 l- R+ \$ I+ m, k2 W' N. A
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