/** Returns a new EllipseArc2D. */
public EllipseArc2D subCurve(double t0, double t1) {
// convert position to angle
t0 = Angle2D.formatAngle(startAngle + t0);
t1 = Angle2D.formatAngle(startAngle + t1);
// check bounds of angles
if (!Angle2D.containsAngle(startAngle, startAngle + angleExtent, t0, angleExtent > 0))
t0 = startAngle;
if (!Angle2D.containsAngle(startAngle, startAngle + angleExtent, t1, angleExtent > 0))
t1 = angleExtent;
// create new arc
return new EllipseArc2D(ellipse, t0, t1, angleExtent > 0);
}
public Box2D boundingBox() {
// first get ending points
Point2D p0 = firstPoint();
Point2D p1 = lastPoint();
// get coordinate of ending points
double x0 = p0.x();
double y0 = p0.y();
double x1 = p1.x();
double y1 = p1.y();
// initialize min and max coords
double xmin = min(x0, x1);
double xmax = max(x0, x1);
double ymin = min(y0, y1);
double ymax = max(y0, y1);
// precomputes some values
Point2D center = ellipse.center();
double xc = center.x();
double yc = center.y();
double endAngle = startAngle + angleExtent;
boolean direct = angleExtent >= 0;
// check cases arc contains one maximum
if (Angle2D.containsAngle(startAngle, endAngle, PI / 2 + ellipse.theta, direct))
ymax = max(ymax, yc + ellipse.r1);
if (Angle2D.containsAngle(startAngle, endAngle, 3 * PI / 2 + ellipse.theta, direct))
ymin = min(ymin, yc - ellipse.r1);
if (Angle2D.containsAngle(startAngle, endAngle, ellipse.theta, direct))
xmax = max(xmax, xc + ellipse.r2);
if (Angle2D.containsAngle(startAngle, endAngle, PI + ellipse.theta, direct))
xmin = min(xmin, xc - ellipse.r2);
// return a bounding with computed limits
return new Box2D(xmin, xmax, ymin, ymax);
}
public boolean containsAngle(double angle) {
return Angle2D.containsAngle(startAngle, startAngle + angleExtent, angle, angleExtent > 0);
}