77 lines
2.0 KiB
Dart
77 lines
2.0 KiB
Dart
import 'dart:math';
|
|
|
|
import 'package:flutter/material.dart';
|
|
|
|
import 'utils.dart';
|
|
|
|
class BasePainter extends CustomPainter {
|
|
Color baseColor;
|
|
Color selectionColor;
|
|
int primarySectors;
|
|
int secondarySectors;
|
|
double sliderStrokeWidth;
|
|
|
|
Offset center;
|
|
double radius;
|
|
|
|
BasePainter({
|
|
@required this.baseColor,
|
|
@required this.selectionColor,
|
|
@required this.primarySectors,
|
|
@required this.secondarySectors,
|
|
@required this.sliderStrokeWidth,
|
|
});
|
|
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
Paint base = _getPaint(color: baseColor);
|
|
|
|
center = Offset(size.width / 2, size.height / 2);
|
|
radius = min(size.width / 2, size.height / 2) - sliderStrokeWidth;
|
|
// we need this in the parent to calculate if the user clicks on the circumference
|
|
|
|
assert(radius > 0);
|
|
|
|
canvas.drawCircle(center, radius, base);
|
|
|
|
if (primarySectors > 0) {
|
|
_paintSectors(primarySectors, 8.0, selectionColor, canvas);
|
|
}
|
|
|
|
if (secondarySectors > 0) {
|
|
_paintSectors(secondarySectors, 6.0, baseColor, canvas);
|
|
}
|
|
}
|
|
|
|
void _paintSectors(
|
|
int sectors, double radiusPadding, Color color, Canvas canvas) {
|
|
Paint section = _getPaint(color: color, width: 2.0);
|
|
|
|
var endSectors =
|
|
getSectionsCoordinatesInCircle(center, radius + radiusPadding, sectors);
|
|
var initSectors =
|
|
getSectionsCoordinatesInCircle(center, radius - radiusPadding, sectors);
|
|
_paintLines(canvas, initSectors, endSectors, section);
|
|
}
|
|
|
|
void _paintLines(
|
|
Canvas canvas, List<Offset> inits, List<Offset> ends, Paint section) {
|
|
assert(inits.length == ends.length && inits.length > 0);
|
|
|
|
for (var i = 0; i < inits.length; i++) {
|
|
canvas.drawLine(inits[i], ends[i], section);
|
|
}
|
|
}
|
|
|
|
Paint _getPaint({@required Color color, double width, PaintingStyle style}) =>
|
|
Paint()
|
|
..color = color
|
|
..strokeCap = StrokeCap.round
|
|
..style = style ?? PaintingStyle.stroke
|
|
..strokeWidth = width ?? sliderStrokeWidth;
|
|
|
|
@override
|
|
bool shouldRepaint(CustomPainter oldDelegate) {
|
|
return false;
|
|
}
|
|
} |