Creating a image file using TextLayout. Need to find right startYpoint

Hi,

I am trying to create a PNG image out of a text that the user entered. The image height is user configurable.
Steps:
1. Get the text attributes as an AttributedString
2. Create a textLayout instance using the AttributedString and a FontRendererContext.
3. Get the bounds from the textLayout.
4. Create a Buffered Image of height = userdefined and width= textLayout.bounds.width
5. Get the graphics2D object from the buffered image.
6. Add scaling depending on the height.
7. Draw the textLayout on the image and write it into a file.

The problem I am facing is finding the Y position to start drawing from using the textlayout.draw method [Step 7].
I have not been able to get down to a generalized formula that would work with all fonts.
What I see is sometimes the text is clipped [ either @ the top or @ the bottom].
Any help on this regard will be greatly appreciated.
I am adding the code which creates the png.

public static void createlImage()
 	{
	 try
	 {
   		AttributedString at = getAttributes(); //Get Attributes of the Text such as FONT, BOLD, ITALICS, COLOR and others.
	   	FontRenderContext frc = new FontRenderContext(null, true, true);
		TextLayout tLayout = new TextLayout(at.getIterator(), frc);
	   	GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice()
	               .getDefaultConfiguration();
	   	Rectangle rect = tLayout.getPixelBounds(frc, 0, 0);
	   	double widthRatio = 1;
	   	double heightRatio = (double) imageHeight / rect.height;  //imageHeight is user defined
	   	image1 = gc.createCompatibleImage(imageWidth , imageHeight*2, Transparency.TRANSLUCENT);
	   	Graphics2D g1 = (Graphics2D) image1.getGraphics();
	   	g1.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
	   	g1.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
	   	g1.scale(widthRatio, heightRatio);
                int startYpoint = (int)( (tLayout.getAscent() + tLayout.getDescent()) / 2 +tLayout.getDescent()); //This is wrong??
		tLayout.draw(g1, 0, startYpoint );   //Need to find right startYPoint
		ImageIO.write(image1, "PNG", new File(writefile));
 	}
 	catch (Exception e)
 	{
		e.printStackTrace();
	}

}

Jack Reacher wrote:

Please check your private messages for an important administrative matter

Check out the FontMetrics class. It should help you figure out the width/height of a String when rendered using a particular Font

Thanks for the tip.
But FontMetrics did not help out much. The whole problem seems to be the scaling. Once scaled I seem to loose control as to where it should start rendering the text.
I modified the image drawing to use fontMetrics

Attached is the png file the above created with Arial Bold Font

Shouldn't you be calling drawString() before scaling?

Well no.
According to java docs,

Subsequent rendering is resized according to the specified scaling factors relative to the previous scaling.

So I think the scale has to be before the drawString else the text would not be scaled at all.

Avinash Hegde wrote:Well no.
According to java docs,

Subsequent rendering is resized according to the specified scaling factors relative to the previous scaling.

So I think the scale has to be before the drawString else the text would not be scaled at all.

And I think you should be multiplying y by the heightRatio.

Let me try that out. Thanks..

Seems to work. thanks everyone..