public QuadCurve2D evaluate(QuadCurve2D v0, QuadCurve2D v1, float fraction) {
double x1 = v0.getX1() + ((v1.getX1() - v0.getX1()) * fraction);
double y1 = v0.getY1() + ((v1.getY1() - v0.getY1()) * fraction);
double x2 = v0.getX2() + ((v1.getX2() - v0.getX2()) * fraction);
double y2 = v0.getY2() + ((v1.getY2() - v0.getY2()) * fraction);
double ctrlx = v0.getCtrlX() + ((v1.getCtrlX() - v0.getCtrlX()) * fraction);
double ctrly = v0.getCtrlY() + ((v1.getCtrlY() - v0.getCtrlY()) * fraction);
QuadCurve2D value = (QuadCurve2D) v0.clone();
value.setCurve(x1, y1, ctrlx, ctrly, x2, y2);
return value;
}
private static CubicCurve2D _toCubicCurve(Shape seg, CubicCurve2D cub) {
if (cub == null) {
cub = new CubicCurve2D.Double();
}
if (seg instanceof Line2D) {
Line2D src = (Line2D) seg;
cub.setCurve(
src.getX1(),
src.getY1(),
src.getX1(),
src.getY1(),
src.getX2(),
src.getY2(),
src.getX2(),
src.getY2());
} else if (seg instanceof Ellipse2D) {
throw new InternalError("Can't convert Ellipse2D to CubicCurve2D");
} else if (seg instanceof Arc2D) {
throw new InternalError("Can't convert Arc2D to CubicCurve2D");
} else if (seg instanceof QuadCurve2D) {
QuadCurve2D src = (QuadCurve2D) seg;
cub.setCurve(
src.getX1(),
src.getY1(),
src.getCtrlX(),
src.getCtrlY(),
src.getCtrlX(),
src.getCtrlY(),
src.getX2(),
src.getY2());
} else {
CubicCurve2D src = (CubicCurve2D) seg;
cub.setCurve(
src.getX1(),
src.getY1(),
src.getCtrlX1(),
src.getCtrlY1(),
src.getCtrlX2(),
src.getCtrlY2(),
src.getX2(),
src.getY2());
}
return cub;
}