How to fill polygon without using paint component ?

Question

hello,
i have a class called "public class Arrow2DRhombus implements Shape" with the following constructor:
public Arrow2DRhombus(Point2D begin, Point2D end) {
        this.x1 = begin.getX();
        this.y1 = begin.getY();
        this.x2 = end.getX();
        this.y2 = end.getY();
        this.initArrow();the code for .initArrow():
private void initArrow(){
        int length = (int) Math.sqrt(Math.pow(Math.abs(x1-x2),2) +
                       Math.pow(Math.abs(y1-y2),2));
        length=length-19;
Polygon poly = new Polygon();
        poly.addPoint((int) x1,(int) y1);
        poly.addPoint((int) x1+ length,(int) y1);
          poly.addPoint((int) x1+ length+10,(int) y1+5);
          poly.addPoint((int) x1+ length+20,(int) y1);
          poly.addPoint((int) x1+ length+10,(int) y1-5);
          poly.addPoint((int) x1+ length,(int) y1);
        double rad = this.calcAngle((float) this.x1,(float) this.y1,(float) this.x2,(float) this.y2);
        AffineTransform tx = AffineTransform.getRotateInstance(rad,x1,y1);
        this.arrow = tx.createTransformedShape((Shape)poly);
    }is there a way i can fill the polygon "poly" with the code above .
i know that i can fill a polygon using when using paintcomponent(Graphics g)
but here how can i do it.
10x

Answer 1

I don't really understand the question. "Filling" a shape implies (to me) that you have a Graphics Object and are doing custom painting. So you would do this:
a) in the paintComponent() method of a component
b) in the paintIcon method of an Icon
c) by painting onto a BufferedImage
I'm sure there are other ways, but I don't think you just "fill" a Shape object.