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show lines for zooming

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lukas-heiligenbrunner 2022-10-24 16:28:56 +02:00
parent d24f0407b8
commit 693d0538ef
2 changed files with 34 additions and 41 deletions
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47
lib/canvas/drawing_page.dart
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@ -18,7 +18,7 @@ class _DrawingPageState extends State<DrawingPage> {
List<Stroke> _strokes = []; List<Stroke> _strokes = [];
bool allowDrawWithFinger = false; bool allowDrawWithFinger = false;
double zoom = 0.6; double zoom = .5;
Offset scrollPos = const Offset(.0, .0); Offset scrollPos = const Offset(.0, .0);
@override @override
@ -37,7 +37,10 @@ class _DrawingPageState extends State<DrawingPage> {
return basetickness; return basetickness;
// todo do correct linear interpolation and extimate angle // todo do correct linear interpolation and extimate angle
final lininterpol = PolynomialInterpolation(nodes: pts.map((e) => InterpolationNode(x: e.point.dx, y: e.point.dy)).toList(growable: false)); final lininterpol = PolynomialInterpolation(
nodes: pts
.map((e) => InterpolationNode(x: e.point.dx, y: e.point.dy))
.toList(growable: false));
lininterpol.compute(1.0); lininterpol.compute(1.0);
print(lininterpol.buildPolynomial().toString()); print(lininterpol.buildPolynomial().toString());
@ -102,40 +105,16 @@ class _DrawingPageState extends State<DrawingPage> {
print(_strokes.last.points.length); print(_strokes.last.points.length);
} }
}, },
// child: GestureDetector( child: GestureDetector(
// onPanUpdate: (DragUpdateDetails details) { onScaleUpdate: (details) {
// setState(() { setState(() {
// _strokes = List.from(_strokes,growable: false)..last.points.add(details.localPosition); zoom = details.scale;
// }); });
// }, },
// onPanEnd: (DragEndDetails details) {
// if(_strokes.last.points.length <= 1){
// // if the line consists only of one point (point) add endpoint as the same to allow drawing a line
// // todo maybe solve this in custompainter in future
// setState(() {
// _strokes = List.from(_strokes,growable: false)..last.points.add(_strokes.last.points.last);
// });
// }else{
// setState(() {});
// }
//
//
// print(_strokes.length);
// print(_strokes.last.points.length);
// },
// onPanStart: (details) {
// setState(() {
// _strokes = List.from(_strokes)..add(Stroke.fromPoints([details.localPosition]));
// });
// },
child: SingleChildScrollView(
child: Center(
child: CustomPaint( child: CustomPaint(
painter: MyPainter(strokes: _strokes), painter: MyPainter(strokes: _strokes,offset: scrollPos, zoom: zoom),
// todo not working // todo not working
size: Size(zoomedwidth, zoomedwidth * sqrt2), // todo add different paper dimensions size: Size.infinite, // todo add different paper dimensions
// ),
),
), ),
), ),
), ),

20
lib/canvas/my_painter.dart
View File

@ -3,19 +3,31 @@ import 'package:flutter/material.dart';
import 'document_types.dart'; import 'document_types.dart';
class MyPainter extends CustomPainter { class MyPainter extends CustomPainter {
List<Stroke> strokes = <Stroke>[]; List<Stroke> strokes;
double zoom;
Offset offset;
MyPainter({required this.strokes}); MyPainter({required this.strokes, required this.zoom, required this.offset});
@override @override
void paint(Canvas canvas, Size size) { void paint(Canvas canvas, Size size) {
var paint = Paint() var paint = Paint()
..color = Colors.blue ..color = Colors.blue
..strokeCap = StrokeCap.square; ..strokeCap = StrokeCap.square;
// ..strokeWidth = 3.0;
// ..strokeWidth = 3.0;
// canvas.scale(zoom);
print("zoom: ${zoom}");
canvas.drawColor(Color.fromRGBO(255, 255, 255, .1), BlendMode.src); canvas.drawColor(Color.fromRGBO(255, 255, 255, .1), BlendMode.src);
final pagewidth = size.width * zoom;
final sidewidth = (size.width - pagewidth) / 2;
canvas.drawLine(Offset(sidewidth, .0), Offset(sidewidth, size.height), paint);
canvas.drawLine(Offset(sidewidth + pagewidth, .0), Offset(sidewidth + pagewidth, size.height), paint);
for(final stroke in strokes){ for(final stroke in strokes){
for(int i = 0; i < stroke.points.length -1; i++){ for(int i = 0; i < stroke.points.length -1; i++){
final pt1 = stroke.points[i].point; final pt1 = stroke.points[i].point;
@ -25,6 +37,8 @@ class MyPainter extends CustomPainter {
canvas.drawLine(pt1, pt2, paint..strokeWidth = stroke.points[i].thickness); canvas.drawLine(pt1, pt2, paint..strokeWidth = stroke.points[i].thickness);
} }
} }
} }
@override @override