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samples/web/timeflow/lib/main.dart

261 lines
6.1 KiB

import 'dart:core';
import 'dart:math';
import 'package:flutter_web/material.dart';
import 'package:flutter_web/scheduler.dart';
import 'numberpicker.dart';
main() => runApp(MaterialApp(home: App(), debugShowCheckedModeBanner: false));
class App extends StatefulWidget {
@override
State<StatefulWidget> createState() => TM();
}
enum SI { pause, play, stop }
List<T> triangles;
var percent = 0.0, cTime = 0.0, dur = 120000.0, rng = Random(), rebuild = true;
class TM extends State<App> {
SI cState = SI.stop;
Ticker t;
var pTime = 0.0;
@override
initState() {
// Screen.keepOn(true);
t = Ticker(up);
super.initState();
}
up(Duration d) {
if (cState == SI.play) {
setState(() {
if (cTime >= dur)
stop();
else {
cTime = d.inMilliseconds.toDouble() + pTime;
percent = cTime / dur;
}
});
}
}
press() {
if (cState == SI.play)
pause();
else if (cState == SI.pause)
play();
else {
cState = SI.play;
t.start();
}
}
pause() {
setState(() {
cState = SI.pause;
t.stop();
});
}
play() {
setState(() {
cState = SI.play;
t.start();
pTime = cTime;
});
}
stop() {
setState(() {
cState = SI.stop;
t.stop();
pTime = 0.0;
cTime = 0.0;
percent = 0.0;
});
}
openDialog() {
showDialog<num>(
context: context,
builder: (BuildContext context) {
return NumberPickerDialog.integer(
initialIntegerValue: (dur + 1.0) ~/ 60000,
maxValue: 20,
minValue: 1,
title: Text('Minutes'));
}).then((num v) {
if (v != null) dur = 60000.0 * v;
});
}
@override
Widget build(BuildContext context) {
List<Widget> w = List();
if (cState == SI.pause) {
w.add(fab(Colors.green, play, Icons.play_arrow));
w.add(SizedBox(height: 10));
w.add(fab(Colors.red, stop, Icons.close));
w.add(SizedBox(height: 20));
}
if (cState == SI.stop) {
w.add(fab(Colors.lightBlue, openDialog, Icons.timer));
w.add(SizedBox(height: 10));
w.add(fab(Colors.yellow[900], () {
rebuild = true;
}, Icons.loop));
w.add(SizedBox(height: 20));
}
Column r = Column(mainAxisAlignment: MainAxisAlignment.end, children: w);
return Scaffold(
backgroundColor: Colors.black,
body: SizedBox.expand(
child: Container(
child: CustomPaint(
painter: P(),
child: FlatButton(
onPressed: press,
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [r]))))));
}
}
FloatingActionButton fab(Color c, VoidCallback f, IconData ic) =>
FloatingActionButton(backgroundColor: c, onPressed: f, child: Icon(ic));
class P extends CustomPainter {
@override
paint(Canvas canvas, Size size) {
var w = size.width, h = size.height, d = 2 / 3 * w;
if (w > 0.1 && h > 0.1) {
if (rebuild) {
rebuild = false;
setupT();
for (var t in triangles) t.setupdP(w / d, h / d);
}
for (var t in triangles) {
var cP = t.cP(), p = Path();
p.moveTo(cP[0].x * d + w / 2, cP[0].y * d + h / 2);
for (i = 1; i < 3; i++)
p.lineTo(cP[i].x * d + w / 2, cP[i].y * d + h / 2);
p.close();
canvas.drawPath(p, t.p);
}
}
}
@override
bool shouldRepaint(CustomPainter oldDelegate) => true;
}
int i;
class T {
List<Point> dP = List(3), sP = List(3);
Paint p;
T(Point p1, p2, p3, var c) {
p = Paint()..style = PaintingStyle.fill;
sP[0] = p1;
sP[1] = p2;
sP[2] = p3;
p.color = c[100 * (rng.nextInt(9) + 1)];
double x = 0, y = 0;
for (i = 0; i < 3; i++) {
x += sP[i].x;
y += sP[i].y;
}
x = 2 * x / 3;
y = 2 * y / 3;
if (x * x + y * y < 1) triangles.add(this);
}
setupdP(double wR, hR) {
var x = (rng.nextDouble() - 0.5) * (wR - 0.1),
y = (rng.nextDouble() - 0.5) * (hR - 0.1);
dP[0] = Point(x, y);
for (i = 1; i < 3; i++)
dP[i] = Point(sP[i].x + x - sP[0].x, sP[i].y + y - sP[0].y);
}
List<Point> cP() {
List<Point> res = List(3);
var p, k, o = 6000, r;
if (cTime < o)
p = 1 - cTime / o;
else
p = (cTime - o) / (dur - o);
k = 2 * ((cTime.toInt() % o) - o / 2).abs() / o;
r = min(min(1, (dur - cTime) / o), cTime / o);
this.p.color = this.p.color.withAlpha(255 - (200 * k * r).toInt());
for (i = 0; i < 3; i++)
res[i] = Point(
sP[i].x * p + dP[i].x * (1 - p), sP[i].y * p + dP[i].y * (1 - p));
if (cTime > o) {
var d = res[0].distanceTo(sP[0]);
var a = acos((sP[0].x - res[0].x) / d);
if (sP[0].y > res[0].y) a = 2 * pi - a;
var b = pi - a + p * pi * dur / 120000;
var dX = cos(b) * d, dY = sin(b) * d;
for (i = 0; i < 3; i++) res[i] = Point(sP[i].x + dX, sP[i].y + dY);
}
double mx = 0, my = 0;
for (i = 0; i < 3; i++) {
mx += res[i].x;
my += res[i].y;
}
mx /= 3;
my /= 3;
for (i = 0; i < 3; i++)
res[i] = Point(res[i].x + (res[i].x - mx) * (1 - k) * r / 2,
res[i].y + (res[i].y - my) * (1 - k) * r / 2);
return res;
}
}
setupT() {
int dim = 20, x, y;
List<Point> tri = List(dim * dim);
for (x = 0; x < dim; x++) {
for (y = 0; y < dim; y++) {
var dx = rng.nextDouble() - 0.5, dy = rng.nextDouble() - 0.5, off;
if (x % 2 == 0)
off = 0;
else
off = 0.5;
tri[x * dim + y] =
Point((x + dx) / (dim - 1) - 0.5, (y + off + dy) / (dim - 1) - 0.5);
}
}
triangles = List();
var r = rng.nextInt(5), c;
if (r == 0) c = Colors.lightBlue;
if (r == 1) c = Colors.yellow;
if (r == 2) c = Colors.lightGreen;
if (r == 3) c = Colors.red;
if (r == 4) c = Colors.pink;
for (x = 0; x < dim - 1; x++) {
for (y = 0; y < dim - 1; y++) {
int off = x * dim;
T(tri[y + off], tri[y + 1 + off], tri[y + off + dim], c);
T(tri[y + off + dim], tri[y + 1 + off], tri[y + 1 + off + dim], c);
}
}
}