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bezierCurvePainter.dart
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Wed, Nov 13, 10:20

bezierCurvePainter.dart
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import 'package:flutter/material.dart';
class BezierCurvePainter extends CustomPainter {
Paint _paint;
double _progress;
Offset beginpath;
Offset endpath;
Offset beginpathM;
Offset endpathM;
int currentTurn;
double coeffScreenMapHeight;
double coeffScreenMapWidth;
double strokeWidth;
var midddlePoint1 = [
Offset(291.1, 176.2),
Offset(110.2, 632.8),
Offset(610.2, 732.8)
];
var midddlePoint2 = [
Offset(410.2, 532.8),
Offset(356, 357),
Offset(110.2, 232.8)
];
var midddlePoint1M = [
Offset(291.1, 176.2),
Offset(110.2, 232.8),
Offset(110.2, 232.8)
];
var midddlePoint2M = [
Offset(291.1, 176.2),
Offset(110.2, 232.8),
Offset(110.2, 232.8)
];
BezierCurvePainter(this.beginpath, this.endpath, this.coeffScreenMapWidth,
this.coeffScreenMapHeight, this.currentTurn, this.strokeWidth) {
_paint = Paint()
..style = PaintingStyle.stroke
..strokeJoin = StrokeJoin.round
..strokeCap = StrokeCap.round
..color = Colors.black
..strokeWidth = strokeWidth;
beginpathM = Offset(this.beginpath.dx * coeffScreenMapWidth,
beginpath.dy * coeffScreenMapHeight);
endpathM = Offset(this.endpath.dx * coeffScreenMapWidth,
endpath.dy * coeffScreenMapHeight);
for (int i = 0; i < 3; i++) {
midddlePoint1M[i] = Offset(midddlePoint1[i].dx * coeffScreenMapWidth,
midddlePoint1[i].dy * coeffScreenMapHeight);
midddlePoint2M[i] = Offset(midddlePoint2[i].dx * coeffScreenMapWidth,
midddlePoint2[i].dy * coeffScreenMapHeight);
}
}
@override
void paint(Canvas canvas, Size size) {
Path path = Path()
..moveTo(beginpathM.dx, beginpathM.dy)
..cubicTo(
midddlePoint1M[currentTurn - 1].dx,
midddlePoint1M[currentTurn - 1].dy,
midddlePoint2M[currentTurn - 1].dx,
midddlePoint2M[currentTurn - 1].dy,
endpathM.dx,
endpathM.dy);
canvas.drawPath(path, _paint);
}
@override
bool shouldRepaint(BezierCurvePainter oldDelegate) {
return oldDelegate._progress != _progress;
}
}

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