public void invokeStep(int x, int y, int anchorX, int anchorY, DrawingView view) {
int dx = x - anchorX;
int dy = y - anchorY;
RoundRectangleFigure owner = (RoundRectangleFigure) owner();
Rectangle r = owner.displayBox();
Point originalRadius = ((RadiusHandle.UndoActivity) getUndoActivity()).getOldRadius();
int rx = Geom.range(0, r.width, 2 * (originalRadius.x / 2 + dx));
int ry = Geom.range(0, r.height, 2 * (originalRadius.y / 2 + dy));
owner.setArc(rx, ry);
}
public Point locate() {
RoundRectangleFigure owner = (RoundRectangleFigure) owner();
Point radius = owner.getArc();
Rectangle r = owner.displayBox();
return new Point(r.x + radius.x / 2 + OFFSET, r.y + radius.y / 2 + OFFSET);
}