public static Intersection QuadraticBezierSegmentQuadraticBezierSegmentIntersection00( double a1X, double a1Y, double a2X, double a2Y, double a3X, double a3Y, double b1X, double b1Y, double b2X, double b2Y, double b3X, double b3Y, double epsilon = Epsilon) { // Initialize the intersection. var result = new Intersection(IntersectionStates.NoIntersection); // ToDo: Break early if the AABB of the ends and handles do not intersect. // ToDo: Break early if the AABB of the curve does not intersect. // Parametric matrix form of the Bézier curve var xCoeffA = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(a1X, a2X, a3X); var yCoeffA = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(a1Y, a2Y, a3Y); var xCoeffB = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1X, b2X, b3X); var yCoeffB = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1Y, b2Y, b3Y); IList <double> roots = new List <double>(); if (yCoeffA.C == 0) { var v0 = xCoeffA.C * (yCoeffA.A - yCoeffB.A); var v1 = v0 - (xCoeffA.B * yCoeffA.B); var v2 = v0 + v1; var v3 = yCoeffA.B * yCoeffA.B; roots = QuarticRootsTests.QuarticRoots( /* t^4 */ xCoeffA.C * yCoeffB.C * yCoeffB.C, /* t^3 */ 2 * xCoeffA.C * yCoeffB.B * yCoeffB.C, /* t^2 */ (xCoeffA.C * yCoeffB.B * yCoeffB.B) - (xCoeffB.C * v3) - (yCoeffB.C * v0) - (yCoeffB.C * v1), /* t^1 */ (-xCoeffB.B * v3) - (yCoeffB.B * v0) - (yCoeffB.B * v1), /* C^0 */ ((xCoeffA.A - xCoeffB.A) * v3) + ((yCoeffA.A - yCoeffB.A) * v1), epsilon); } else { var v0 = (xCoeffA.C * yCoeffB.C) - (yCoeffA.C * xCoeffB.C); var v1 = (xCoeffA.C * yCoeffB.B) - (xCoeffB.B * yCoeffA.C); var v2 = (xCoeffA.B * yCoeffA.C) - (yCoeffA.B * xCoeffA.C); var v3 = yCoeffA.A - yCoeffB.A; var v4 = (yCoeffA.C * (xCoeffA.A - xCoeffB.A)) - (xCoeffA.C * v3); var v5 = (-yCoeffA.B * v2) + (yCoeffA.C * v4); var v6 = v2 * v2; roots = QuarticRootsTests.QuarticRoots( /* t^4 */ v0 * v0, /* t^3 */ 2 * v0 * v1, /* t^2 */ ((-yCoeffB.C * v6) + (yCoeffA.C * v1 * v1) + (yCoeffA.C * v0 * v4) + (v0 * v5)) / yCoeffA.C, /* t^1 */ ((-yCoeffB.B * v6) + (yCoeffA.C * v1 * v4) + (v1 * v5)) / yCoeffA.C, /* C^0 */ ((v3 * v6) + (v4 * v5)) / yCoeffA.C, epsilon); } foreach (var s in roots) { var point = new Point2D( (xCoeffB.C * s * s) + (xCoeffB.B * s) + xCoeffB.A, (yCoeffB.C * s * s) + (yCoeffB.B * s) + yCoeffB.A); if (s >= 0 && s <= 1) { var xRoots = QuadraticRootsTests.QuadraticRoots( /* t^2 */ -xCoeffA.C, /* t^1 */ -xCoeffA.B, /* C^0 */ -xCoeffA.A + point.X, epsilon); var yRoots = QuadraticRootsTests.QuadraticRoots( /* t^2 */ -yCoeffA.C, /* t^1 */ -yCoeffA.B, /* C^0 */ -yCoeffA.A + point.Y, epsilon); if (xRoots.Count > 0 && yRoots.Count > 0) { // Find the nearest matching x and y roots in the ranges 0 < x < 1; 0 < y < 1. foreach (var xRoot in xRoots) { if (xRoot >= 0 && xRoot <= 1) { foreach (var yRoot in yRoots) { var t = xRoot - yRoot; if ((t >= 0 ? t : -t) < epsilon) { result.AppendPoint(point); goto checkRoots; // Break through two levels of foreach loops to exit early. Using goto for performance. } } } } checkRoots :; } } } if (result.Items.Count > 0) { result.State = IntersectionStates.Intersection; } return(result); }
public static Intersection QuadraticBezierSegmentOrthogonalEllipseIntersection(double b1X, double b1Y, double b2X, double b2Y, double b3X, double b3Y, double ecX, double ecY, double rx, double ry, double epsilon = double.Epsilon) => BernsteinQuadraticBezierSegmentOrthogonalEllipseIntersectionTests.QuadraticBezierSegmentOrthogonalEllipseIntersection(QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1X, b2X, b3X), QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1Y, b2Y, b3Y), ecX, ecY, rx, ry, epsilon);
public static Intersection QuadraticBezierSegmentQuadraticBezierSegmentIntersection0( double a1X, double a1Y, double a2X, double a2Y, double a3X, double a3Y, double b1X, double b1Y, double b2X, double b2Y, double b3X, double b3Y, double epsilon = Epsilon) { // Initialize the intersection. var result = new Intersection(IntersectionStates.NoIntersection); var xCoeffA = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(a1X, a2X, a3X); var yCoeffA = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(a1Y, a2Y, a3Y); var xCoeffB = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1X, b2X, b3X); var yCoeffB = QuadraticBezierBernsteinBasisTests.QuadraticBezierBernsteinBasis(b1Y, b2Y, b3Y); var a = (xCoeffA.C * yCoeffA.B) - (xCoeffA.B * yCoeffA.C); var b = (xCoeffB.C * yCoeffA.B) - (xCoeffA.B * yCoeffB.C); var c = (xCoeffB.B * yCoeffA.B) - (xCoeffA.B * yCoeffB.B); var d = (xCoeffA.B * (yCoeffA.A - yCoeffB.A)) - (yCoeffA.B * (xCoeffB.A - xCoeffA.A)); var e = (xCoeffB.C * yCoeffA.C) - (xCoeffA.C * yCoeffB.C); var f = (xCoeffB.B * yCoeffA.C) - (xCoeffA.C * yCoeffB.B); var g = (xCoeffA.C * (yCoeffA.A - yCoeffB.A)) - (yCoeffA.C * (yCoeffB.A - xCoeffA.A)); var roots = QuarticRootsTests.QuarticRoots( /* t^4 */ e * e, /* t^3 */ 2 * e * f, /* t^2 */ (-a * b) + (f * f) + (2 * e * g), /* t^1 */ (-a * c) + (2 * f * g), /* C */ (-a * d) + (g * g), epsilon); foreach (var s in roots) { var point = new Point2D( (xCoeffB.C * s * s) + (xCoeffB.B * s) + xCoeffB.A, (yCoeffB.C * s * s) + (yCoeffB.B * s) + yCoeffB.A); if (s >= 0 && s <= 1) { var xRoots = QuadraticRootsTests.QuadraticRoots( /* t^2 */ -xCoeffA.C, /* t^1 */ -xCoeffA.B, /* C */ -xCoeffA.A + point.X, epsilon); var yRoots = QuadraticRootsTests.QuadraticRoots( /* t^2 */ -yCoeffA.C, /* t^1 */ -yCoeffA.B, /* C */ -yCoeffA.A + point.Y, epsilon); if (xRoots.Count > 0 && yRoots.Count > 0) { // Find the nearest matching x and y roots in the ranges 0 < x < 1; 0 < y < 1. foreach (var xRoot in xRoots) { if (xRoot >= 0 && xRoot <= 1) { foreach (var yRoot in yRoots) { var t = xRoot - yRoot; if ((t >= 0 ? t : -t) < 0.06) // ToDo: Find the error and replace 0.06 with epsilon. { result.AppendPoint(point); goto checkRoots; // Break through two levels of foreach loops. Using goto for performance. } } } } checkRoots :; } } } if (result.Items.Count > 0) { result.State = IntersectionStates.Intersection; } return(result); }