Scaling graphic-primitive's points only

Question

Hi.
Is there any possibility to scale 2D Graphic primitives (Lines, Arcs, Rectangles, etc..) in a way that only the primitive's edge points are affected?
My problem is as follows:
All primitives in my Panel (for example, a line, which is drawn by g.drawLine(....)) do react when a user resizes the panel/window. If the windowsize grows, so does the thickness of the line.
I just want the endpoints to be scaled (ie. moved/scaled in my coordinate system), not the line itself.
My code goes like this:
public void paint(Graphics g)
Graphics2D g2 = (Graphics2D) g;
g2.scale(scaleX, scaleY);
g2.drawLine(..........coords......);
Where the variables scaleX/Y are computed relative to the size of the panel (and relative to the width/height
presented by the current view of my coordinate system).
The endpoints of my primitives are scaled correctly of course, but how can I avoid this "zooming" effect which kinda ***** up the whole drawing.
Thanks in advance.

Answer 1

Run this code and resize the JFrame:
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class X extends JPanel {
    private Shape shape; //drawn within unit circle, in my example
    public X() {
        GeneralPath gp = new GeneralPath();
        //this must be my luck star :-)
        double fifth = 2*Math.PI/5;
        gp.moveTo(1,0);
        gp.lineTo((float)Math.cos(2*fifth), (float)Math.sin(2*fifth));
        gp.lineTo((float)Math.cos(4*fifth), (float)Math.sin(4*fifth));
        gp.lineTo((float)Math.cos(fifth), (float)Math.sin(fifth));
        gp.lineTo((float)Math.cos(3*fifth), (float)Math.sin(3*fifth));
        gp.closePath();
        shape = gp;
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        int w = getWidth(), h = getHeight();
        double scale = 0.90 * Math.min(w,h);
        AffineTransform xform = AffineTransform.getTranslateInstance(w/2, h/2);
        xform.scale(scale/2, scale/2);
        g2.draw(xform.createTransformedShape(shape));
    public static void main(String[] args) {
        JFrame f = new JFrame("");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new X());
        f.setSize(400,300);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
}Tip:
I never change the AffineTransform associated with the graphics object like this:
g2.scale(scaleX, scaleY);(Well, besides the occasional translate)
As you've already seen this rescales everthing, including stroke width. It will also resize fonts in an unpleasing way, images, texture paints, etc...
Instead, I take the Shapes, construct a seperate AffineTransform and pass the shape through it, as demonstrated above.