Bezier

A library for plotting cubic Bezier curves.

Quick description

• Cup() – U-shaped Bezier curve. Control points: p0 = (-1, 1), p1 = (-1, -1), p2 = (1, -1) i p3 = (1, 1);

• Cap() – Cup() rotated by 180 degrees. Control points: p0 = (-1, -1), p1 = (-1, 1), p2 = (1, 1) i p3 = (1, -1);

• ConvexArc() – Convex quarter of unit circle. Control points: p0 = (0, 1), p1 = (ARC, 1), p2 = (1, ARC) i p3 = (1, 0), where ARC = 4*(sqrt(2) - 1)/3;

• ConcaveArc() – Concave quarter of unit circle. Control points: p0 = (0, 1), p1 = (0, 1 - ARC), p2 = (1 - ARC, 0) i p3 = (1, 0);

• LineSegment(p, q) – A segment between p and q. Control points: p0 = p1 = p i p2 = p3 = q;

• MovePoint(f, i, x , y) – translates i-th node of f by x along X axis and by y along Y axis;

• Rotate(f, a) – rotates all nodes of curve f around the point (0,0) by a degrees counterclockwise;

• Scale(f, x, y) – stretches the nodes of f in respect to (0, 0) by x along X axis and by y along Y axis;

• Translate(f, x, y) – transaltes all nodes of curve f by x along X axis and by y along Y axis;

• Print(s, fb, bg) – prints to the output stream s the curve described in constructor using fb for the curve and bg for the background default values: s - std::cout, fg - '*', bg - ' ';

• operator() – returns B(t).

Examples

A few examples are in the file bezier_example.c.