@Pure
	public DoubleProperty x1Property() {
		if (this.p1.x == null) {
			this.p1.x = new SimpleDoubleProperty(this, MathFXAttributeNames.X1);
		}
		return this.p1.x;
	}
@ Pure public DoubleProperty x1Property ( ) { if ( this . p1 . x == null ) { this . p1 . x = new SimpleDoubleProperty ( this , MathFXAttributeNames . X1 ) ; } return this . p1 . x ; }
Replies the property that is the x coordinate of the first segment point.

@return the x1 property.