How to draw a directed arrow line in Java?

Question

I want to draw a directed arrow line through Java.

At present, I am using java.awt.Line2D.Double class to draw a line

g2.setStroke(new B         


        

Answer 1

In the past, I've written the following method to create an an arrow shape, which I can then fill with ((Graphics2D) g).fill(shape);

public static Shape createArrowShape(Point fromPt, Point toPt) {
    Polygon arrowPolygon = new Polygon();
    arrowPolygon.addPoint(-6,1);
    arrowPolygon.addPoint(3,1);
    arrowPolygon.addPoint(3,3);
    arrowPolygon.addPoint(6,0);
    arrowPolygon.addPoint(3,-3);
    arrowPolygon.addPoint(3,-1);
    arrowPolygon.addPoint(-6,-1);


    Point midPoint = midpoint(fromPt, toPt);

    double rotate = Math.atan2(toPt.y - fromPt.y, toPt.x - fromPt.x);

    AffineTransform transform = new AffineTransform();
    transform.translate(midPoint.x, midPoint.y);
    double ptDistance = fromPt.distance(toPt);
    double scale = ptDistance / 12.0; // 12 because it's the length of the arrow polygon.
    transform.scale(scale, scale);
    transform.rotate(rotate);

    return transform.createTransformedShape(arrowPolygon);
}

private static Point midpoint(Point p1, Point p2) {
    return new Point((int)((p1.x + p2.x)/2.0), 
                     (int)((p1.y + p2.y)/2.0));
}