aab29 / bezier.dart Goto Github PK

var cubic = GameObject.shared.cubicBeziers;
    final Path path = Path();
    for (var i = 0; i < cubic.length; i++) {
      drawCurve(cubic[i], path);
    }
    path.close();
    canvas.drawPath(path, _paint);
    
    void drawCurve(CubicBezier curve, Path path) {
  
    vectorMath.Vector2 point0 = curve.startPoint;
    vectorMath.Vector2 point1 = curve.points[1];
    vectorMath.Vector2 point2 = curve.points[2];
    vectorMath.Vector2 point3 = curve.endPoint;
    path.moveTo(point0.x, point0.y);

    path.cubicTo(point1.x, point1.y, point2.x, point2.y, point3.x, point3.y);

  }

import "package:vector_math/vector_math.dart";
import "package:bezier/bezier.dart";


void main() {

  // try to get intersection of zero axis with bezier -> no luck, intersections are empty
  CubicBezier bezier1 = CubicBezier([Vector2(-214.5, 80.0), Vector2(52.0, 80.0), Vector2(52.0, 530.0), Vector2(214.5, 530.0)]);

  Vector2 start1 = Vector2(0.0, 0.0);
  Vector2 end1 = Vector2(0.0, 1080.0);

  List<double> intersections1 = bezier1.intersectionsWithLineSegment(start1, end1);
  print("bezier1 intersections= $intersections1");

  // now try to translate this situation by 429px to right -> it's OK
  CubicBezier bezier2 = CubicBezier([Vector2(429.0 - 214.5, 80), Vector2(429.0 - 52.0, 80), Vector2(429.0 + 52.0, 530), Vector2(429.0 + 214.5, 530)]);

  Vector2 start2 = Vector2(429, 0);
  Vector2 end2 = Vector2(429, 1080);

  List<double> intersections2 = bezier2.intersectionsWithLineSegment(start2, end2);
  print("bezier2 intersections= $intersections2");

}

final line =
        CubicBezier([Vector2(100, 100), Vector2(200, 100), Vector2(200, 100), Vector2(400, 100)]);
final curve =
        CubicBezier([Vector2(200, 50), Vector2(350, 150), Vector2(350, 150), Vector2(200, 200)]);

 final intersection = line.intersectionsWithCurve(curve);
 debugPrint('${intersection.length}');

>>> 1

final line =
        CubicBezier([Vector2(100, 100), Vector2(400, 100), Vector2(400, 100), Vector2(3000, 100)]);

final curve = CubicBezier(
        [Vector2(2000, 50), Vector2(2350, 150), Vector2(2350, 150), Vector2(2000, 200)]);

 final intersection = line.intersectionsWithCurve(curve);
 debugPrint('${intersection.length}');

>>> 0