130 lines
4.3 KiB
Dart
130 lines
4.3 KiB
Dart
import 'dart:math';
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import 'dart:ui';
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import 'package:equations/equations.dart';
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import 'package:flutter/material.dart';
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import 'package:notes/canvas/my_painter.dart';
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import 'document_types.dart';
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class DrawingCanvas extends StatefulWidget {
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const DrawingCanvas({Key? key}) : super(key: key);
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@override
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State<DrawingCanvas> createState() => _DrawingCanvasState();
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}
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class _DrawingCanvasState extends State<DrawingCanvas> {
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List<Stroke> _strokes = [];
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bool allowDrawWithFinger = false;
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(backgroundColor: Colors.blueGrey),
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body: _buildCanvas(),
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);
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}
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double _calcTiltedWidth(double baseWidth, double tilt){
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return baseWidth * tilt;
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}
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double _calcAngleDependentWidth(List<Point> pts, double basetickness){
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// todo do correct linear interpolation and extimate angle
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final lininterpol = PolynomialInterpolation(nodes: pts.map((e) => InterpolationNode(x: e.point.dx, y: e.point.dy)).toList(growable: false));
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lininterpol.compute(1.0);
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print(lininterpol.buildPolynomial().toString());
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// double angle = atan((pt2.dy - pt1.dy)/(pt2.dx - pt1.dx));
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final angle = 5 / (2 * pi);
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// print("pt1: ${pt1}, pt2: ${pt2}, angle: ${angle}");
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return basetickness * (angle / .5 + .5);
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}
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Widget _buildCanvas() {
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return Scaffold(
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body: Listener(
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onPointerMove: (event) {
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// print(event.tilt);
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final pos = event.localPosition;
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final pts = _strokes.last.points;
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if(pts.last.point == pos) return;
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if (allowDrawWithFinger || event.kind != PointerDeviceKind.touch) {
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double newWidth = _calcTiltedWidth(3.0, event.tilt);
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if(_strokes.last.points.length > 1){
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// todo current point not in list
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newWidth = _calcAngleDependentWidth(pts.getRange(pts.length - 10 >= 0 ? pts.length -10 : 0, pts.length).toList(growable: false), event.tilt);
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}
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setState(() {
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_strokes = List.from(_strokes, growable: false)
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..last.points.add(Point(pos, newWidth));
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});
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}
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},
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onPointerDown: (event) {
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if (allowDrawWithFinger || event.kind != PointerDeviceKind.touch) {
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setState(() {
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_strokes = List.from(_strokes)
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..add(Stroke.fromPoints([Point(event.localPosition, _calcTiltedWidth(3.0, event.tilt))]));
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});
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}
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},
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onPointerUp: (event) {
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if (allowDrawWithFinger || event.kind != PointerDeviceKind.touch) {
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if (_strokes.last.points.length <= 1) {
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// if the line consists only of one point (point) add endpoint as the same to allow drawing a line
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// todo maybe solve this in custompainter in future
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setState(() {
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_strokes = List.from(_strokes, growable: false)
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..last.points.add(_strokes.last.points.last);
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});
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} else {
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setState(() {});
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}
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print(_strokes.length);
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print(_strokes.last.points.length);
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}
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},
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// child: GestureDetector(
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// onPanUpdate: (DragUpdateDetails details) {
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// setState(() {
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// _strokes = List.from(_strokes,growable: false)..last.points.add(details.localPosition);
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// });
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// },
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// onPanEnd: (DragEndDetails details) {
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// if(_strokes.last.points.length <= 1){
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// // if the line consists only of one point (point) add endpoint as the same to allow drawing a line
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// // todo maybe solve this in custompainter in future
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// setState(() {
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// _strokes = List.from(_strokes,growable: false)..last.points.add(_strokes.last.points.last);
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// });
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// }else{
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// setState(() {});
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// }
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//
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//
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// print(_strokes.length);
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// print(_strokes.last.points.length);
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// },
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// onPanStart: (details) {
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// setState(() {
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// _strokes = List.from(_strokes)..add(Stroke.fromPoints([details.localPosition]));
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// });
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// },
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child: CustomPaint(
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painter: MyPainter(strokes: _strokes),
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size: Size.infinite,
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// ),
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),
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),
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);
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}
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}
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