Greenfoot

2014/6/25

#

I am trying to add functionality so that you can have an Actor draw on the background as it moves. The basic functionality works great, but now I am trying to allow the user to set the pensize to be something > 1 pixel wide. To do this, I've discovered the setStroke() method for awtImages. I've implemented code like this in my Actor:

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public void setPenSize(int size)
{
    penSize = size;
    java.awt.Graphics2D g = getWorld().getBackground().getAwtImage().createGraphics();
    g.setStroke(new java.awt.BasicStroke(size));
}

However, calling this function seems to do nothing. I'm wondering if anyone knows why this does not work or knows more about how to make it work. I have a feeling I'm getting a new copy of the awt image that underlies the background and then I am making changes to that copy, but I can't figure out how to verify if that's what is happening. Thanks! Vic

danpost

2014/6/25

#

You could just draw, or fill, an oval of the 'penSize' onto the background image. Something like the following:

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Color drawColor = Color.black;
int penSize = 3;
 
private void layInk()
{
    GreenfootImage bg = getWorld().getBackground();
    bg.setColor(drawColor);
    bg.fillOval(getX()-penSize/2, getY()-penSize/2, penSize, penSize);
}

Then your method above would be:

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public void setPenSize(int size)
{
    penSize = size;
}

vtn2@calvin.edu

2014/6/25

#

Thanks for your suggestion. But, I'd really like to use the setStroke() that seems to be available and just exactly what I want. I'm just really curious why the code I wrote does not work.

danpost

2014/6/26

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I believe you still need to create the shape (using 'createStrokedShape') and then render it (using 'draw').

vtn2@calvin.edu

2014/6/28

#

No, none of this is working. but, I did get it to work by changing the greenfoot source code. Thanks anyway.

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Setting the pen size for drawing on the background