Drawing dashed line in java

Question

My problem is that I want to draw a dashed line in a panel, I\'m able to do it but it draw my border in dashed line as well, which is oh my god!

Can someone please e

Answer 1

Another possibility would be to store the values used in swap local variables (Ex. Color , Stroke etc...) and set them back to the on use Graphics.

something like :

Color original = g.getColor();
g.setColor( // your color //);

// your drawings stuff

g.setColor(original);

this will work for whatever change you decide to do to the Graphics.

Answer 2

You modified the graphics context by setting a stroke, and subsequent methods such as paintBorder() use the same context and thus inherit all modifications you made.

Solution: clone the context, use it for painting and dispose it afterwards.

Code:

// derive your own context  
Graphics2D g2d = (Graphics2D) g.create();
// use context for painting
...
// when done: dispose your context
g2d.dispose();

Answer 3

You're modifying the Graphics instance passed into paintComponent(), which is also used to paint the borders.

Instead, make a copy of the Graphics instance and use that to do your drawing:

public void drawDashedLine(Graphics g, int x1, int y1, int x2, int y2){

        //creates a copy of the Graphics instance
        Graphics2D g2d = (Graphics2D) g.create();

        //set the stroke of the copy, not the original 
        Stroke dashed = new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 0);
        g2d.setStroke(dashed);
        g2d.drawLine(x1, y1, x2, y2);

        //gets rid of the copy
        g2d.dispose();
}