58 lines
1.7 KiB
Dart
58 lines
1.7 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:notes/canvas/screen_document_mapping.dart';
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import 'document_types.dart';
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final Rect a4Page =
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Rect.fromPoints(const Offset(.0, .0), const Offset(210, 210 * sqrt2));
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class MyPainter extends CustomPainter {
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List<Stroke> strokes;
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double zoom;
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Offset offset;
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MyPainter({required this.strokes, required this.zoom, required this.offset});
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Offset _translatept(Offset pt, Size canvasSize) {
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final scale = calcPageDependentScale(zoom, a4Page, canvasSize);
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return translateDocumentToScreenPoint(pt, scale, offset);
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}
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Paint backgroundPaint = Paint()..color = Colors.white;
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@override
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void paint(Canvas canvas, Size size) {
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var paint = Paint()
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..color = Colors.blue
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..strokeCap = StrokeCap.square;
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canvas.drawColor(const Color(0xff3f3f3f), BlendMode.src);
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canvas.drawRect(
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Rect.fromPoints(_translatept(const Offset(0, .0), size),
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_translatept(a4Page.bottomRight, size)),
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backgroundPaint);
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for (final stroke in strokes) {
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for (int i = 0; i < stroke.points.length - 1; i++) {
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Offset pt1 = stroke.points[i].point;
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pt1 = _translatept(pt1, size);
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Offset pt2 = stroke.points[i + 1].point;
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pt2 = _translatept(pt2, size);
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// final strokewidth = _calcAngleDependentWidth(pt1, pt2, stroke.points[i].thickness);
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canvas.drawLine(
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pt1, pt2, paint..strokeWidth = stroke.points[i].thickness);
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}
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}
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}
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@override
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bool shouldRepaint(MyPainter oldDelegate) {
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return oldDelegate.strokes != strokes ||
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oldDelegate.zoom != zoom ||
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oldDelegate.offset != offset;
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}
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}
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