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