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import 'dart:math';
import 'dart:ui';
double percentageToRadians(double percentage) => ((2 * pi * percentage) / 100);
double radiansToPercentage(double radians) {
var normalized = radians < 0 ? -radians : 2 * pi - radians;
var percentage = ((100 * normalized) / (2 * pi));
// TODO we have an inconsistency of pi/2 in terms of percentage and radians
return (percentage + 25) % 100;
}
double coordinatesToRadians(Offset center, Offset coords) {
var a = coords.dx - center.dx;
var b = center.dy - coords.dy;
return atan2(b, a);
}
Offset radiansToCoordinates(Offset center, double radians, double radius) {
var dx = center.dx + radius * cos(radians);
var dy = center.dy + radius * sin(radians);
return Offset(dx, dy);
}
double valueToPercentage(int time, int intervals) => (time / intervals) * 100;
int percentageToValue(double percentage, int intervals) =>
((percentage * intervals) / 100).round();
bool isPointInsideCircle(Offset point, Offset center, double rradius) {
var radius = rradius * 1.2;
return point.dx < (center.dx + radius) &&
point.dx > (center.dx - radius) &&
point.dy < (center.dy + radius) &&
point.dy > (center.dy - radius);
}
bool isPointAlongCircle(Offset point, Offset center, double radius) {
// distance is root(sqr(x2 - x1) + sqr(y2 - y1))
// i.e., (7,8) and (3,2) -> 7.21
var d1 = pow(point.dx - center.dx, 2);
var d2 = pow(point.dy - center.dy, 2);
var distance = sqrt(d1 + d2);
return (distance - radius).abs() < 10;
}
double getSweepAngle(double init, double end) {
if (end > init) {
return end - init;
}
return (100 - init + end).abs();
}
List<Offset> getSectionsCoordinatesInCircle(
Offset center, double radius, int sections) {
var intervalAngle = (pi * 2) / sections;
return List<int>.generate(sections, (int index) => index).map((i) {
var radians = (pi / 2) + (intervalAngle * i);
return radiansToCoordinates(center, radians, radius);
}).toList();
}
bool isAngleInsideRadiansSelection(double angle, double start, double sweep) {
var normalized = angle > pi / 2 ? 5 * pi / 2 - angle : pi / 2 - angle;
var end = (start + sweep) % (2 * pi);
return end > start
? normalized > start && normalized < end
: normalized > start || normalized < end;
}
// this is not 100% accurate but it works
// we just want to see if a value changed drastically its value
bool radiansWasModuloed(double current, double previous) {
return (previous - current).abs() > (3 * pi / 2);
}
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