public XYLineAnnotation(double x1,
    double y1,
    double x2,
    double y2) 
{
                                                                                    
        this(x1, y1, x2, y2, new BasicStroke(1.0f), Color.black);
}

Creates a new annotation that draws a line from (x1, y1) to (x2, y2) where the coordinates are measured in data space (that is, against the plot's axes).

Parameters:

x1 - the x-coordinate for the start of the line.

y1 - the y-coordinate for the start of the line.

x2 - the x-coordinate for the end of the line.

y2 - the y-coordinate for the end of the line.

 public XYLineAnnotation(double x1,
    double y1,
    double x2,
    double y2,
    Stroke stroke,
    Paint paint) 
{
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");   
        }
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");   
        }
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;
        this.stroke = stroke;
        this.paint = paint;
}

Creates a new annotation that draws a line from (x1, y1) to (x2, y2) where the coordinates are measured in data space (that is, against the plot's axes).

Parameters:

x1 - the x-coordinate for the start of the line.

y1 - the y-coordinate for the start of the line.

x2 - the x-coordinate for the end of the line.

y2 - the y-coordinate for the end of the line.

stroke - the line stroke (null not permitted).

paint - the line color (null not permitted).

 public Object clone() throws CloneNotSupportedException 
{
        return super.clone();
}

Returns a clone of the annotation.

 public  void draw(Graphics2D g2,
    XYPlot plot,
    Rectangle2D dataArea,
    ValueAxis domainAxis,
    ValueAxis rangeAxis,
    int rendererIndex,
    PlotRenderingInfo info) 
{
        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                plot.getDomainAxisLocation(), orientation);
        RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                plot.getRangeAxisLocation(), orientation);
        float j2DX1 = 0.0f;
        float j2DX2 = 0.0f;
        float j2DY1 = 0.0f;
        float j2DY2 = 0.0f;
        if (orientation == PlotOrientation.VERTICAL) {
            j2DX1 = (float) domainAxis.valueToJava2D(this.x1, dataArea, 
                    domainEdge);
            j2DY1 = (float) rangeAxis.valueToJava2D(this.y1, dataArea, 
                    rangeEdge);
            j2DX2 = (float) domainAxis.valueToJava2D(this.x2, dataArea, 
                    domainEdge);
            j2DY2 = (float) rangeAxis.valueToJava2D(this.y2, dataArea, 
                    rangeEdge);
        }
        else if (orientation == PlotOrientation.HORIZONTAL) {
            j2DY1 = (float) domainAxis.valueToJava2D(this.x1, dataArea, 
                    domainEdge);
            j2DX1 = (float) rangeAxis.valueToJava2D(this.y1, dataArea, 
                    rangeEdge);
            j2DY2 = (float) domainAxis.valueToJava2D(this.x2, dataArea, 
                    domainEdge);
            j2DX2 = (float) rangeAxis.valueToJava2D(this.y2, dataArea, 
                    rangeEdge);                
        }
        g2.setPaint(this.paint);
        g2.setStroke(this.stroke);
        Line2D line = new Line2D.Float(j2DX1, j2DY1, j2DX2, j2DY2);
        g2.draw(line);
        String toolTip = getToolTipText();
        String url = getURL();
        if (toolTip != null || url != null) {
            addEntity(info, ShapeUtilities.createLineRegion(line, 1.0f), 
                    rendererIndex, toolTip, url);
        }
}

Draws the annotation. This method is called by the XYPlot class, you won't normally need to call it yourself.

 public boolean equals(Object obj) 
{
        if (obj == this) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof XYLineAnnotation)) {
            return false;
        }
        XYLineAnnotation that = (XYLineAnnotation) obj;
        if (this.x1 != that.x1) {
            return false;
        }
        if (this.y1 != that.y1) {
            return false;
        }
        if (this.x2 != that.x2) {
            return false;
        }
        if (this.y2 != that.y2) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
            return false;
        }
        // seems to be the same...
        return true;
}

Tests this object for equality with an arbitrary object.

 public int hashCode() 
{
        int result;
        long temp;
        temp = Double.doubleToLongBits(this.x1);
        result = (int) (temp ^ (temp  > > > 32));
        temp = Double.doubleToLongBits(this.x2);
        result = 29 * result + (int) (temp ^ (temp  > > > 32));
        temp = Double.doubleToLongBits(this.y1);
        result = 29 * result + (int) (temp ^ (temp  > > > 32));
        temp = Double.doubleToLongBits(this.y2);
        result = 29 * result + (int) (temp ^ (temp  > > > 32));
        return result;
}

Returns a hash code.