java draw polyline from an arraylist of points

Is it possible to dr开发者_如何学Pythonaw a polyline by passing the method an array list of Point values? something like this:

 ArrayList<Point> projectilePoints=new ArrayList<Point>();
    Projectile p = new Projectile(11, 17, 73, 37);

    for (int i = 0; i < 11; i++) {
        Point point = p.getPositionAt(i);
        projectilePoints.add(point);
    }
    g.drawPolyline(projectilePoints, projectilePoints, 11);

What is the correct way to pass in the parameters of x and y points for the polyline?

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No, there is no such method takes Arraylist of Point reference parameter. The Syntax is,

Graphics.drawPolyline(int[] xPoints, int[] yPoints, int nPoints)

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The JavaDpc on Graphics#drawPolyLine states that you need to pass 2 int arrays that represent the x and y coordinates.

Alternatively, you might use Graphics2d#draw(Shape) and pass a Path2D shape, that can be prefilled using your points (e.g. by calling lineTo(x,y) for all points but the first - for which you might call moveTo(x,y)).

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Call method Graphics2D.drawPolyline. This method takes an int array of X coordinate values, an int array of Y coordinate values and the number of points.

There is no line drawing method that takes Point objects, you have to create int arrays of coordinates.

See http://download.oracle.com/javase/1,5.0/docs/api/java/awt/Graphics2D.html