CODEWITHSUNDEEP
javastringentityimage-manipulationdrawable
user1186437
user1186437

Reputation:

Creating a sized image out of a string in Java

I am making a 2d engine using Java based on entities. The physics and sprites are done, but I still need to be able to draw text with the BaseText class. For experimental purposes I am using the following code in the Renderer class (that handles drawing all the sprites and such):

BufferGraphics.drawString(((BaseText) Entity).getText(), (int) -(Origin.getX() * PositionTransform), (int) -Origin.getY());

I would like to, however, be able to either move this code into the setText(final String Text) method of the BaseText entity, i.e. when it is called a new image is created containing the text specified (possibly in different fonts and sizes and such, I haven't decided).

My problem is this: I would like to be able to resize (scale) the text to my liking. It would also be nice to have the text converted to an image as I can get the dimensions of it and set the size of the text entity itself.

Basically, what I need follows something along these lines:

  1. Take desired string and feed it into the setText method.
  2. Take the string and draw it onto an image, sized so that the text will fit into it exactly.
  3. Set this new image to the Image field in the entity so that the engine can draw it.

Is this even possible? There may be a way to do this with the FontMetrics class or whatever it may be called, but I'm not so sure as I have not used it before.

Edit : Let me clarify: I want to create a BufferedImage based on the size of some text set to a specific font and size, not size the text to fit an image.

Edit 2: Thanks to this fellow Andrew, whom so graciously provided code, I was able to add some code to the engine that, by all means, just plain should work. Again, however, not even with that drawRect in there, the image either remains either transparent or somehow is not getting drawn. Let me supply some breadcrumbs: -snip-

The stupid thing is that all the other sprites and images and such draw fine, so I am not sure how it could be the Renderer. By the way, that was the paint() method.

Edit 3:
...
Uh...
...
Oh my.
I am...
...
Text can not explain how hard I belted myself in the face with my left palm.

BaseText.java

@Override
public BufferedImage getImage() {return null;}

Renderer.java

BufferedImage Image = Entity.getImage();

I am
a huge idiot.
Thank you, Andrew, for that code. It worked fine.

Edit 4: By the way, here's the final code that I used:

public void setText(final String Text)
{
    Graphics2D Draw = (Graphics2D) Game.View.getBuffer().getDrawGraphics();
    FontMetrics Metrics = Draw.getFontMetrics();
    Rectangle2D Bounds = Metrics.getStringBounds(Text, Draw);
    BufferedImage NewImage = new BufferedImage((int) Bounds.getWidth(), (int) (Bounds.getHeight() + Metrics.getDescent()), BufferedImage.TYPE_INT_RGB);
    Draw = (Graphics2D) NewImage.getGraphics();
    Draw.setColor(new Color(0xAAFF0000));
    Draw.drawRect(0, 0, NewImage.getWidth(), NewImage.getHeight());
    Draw.drawString(Text, 0, (int) Bounds.getHeight());
    this.Image = NewImage;
    this.Text = Text;
    this.setSize(new Vector(NewImage.getWidth(), NewImage.getHeight()));
}

Upvotes: 0

Views: 1812

Answers (1)

Andrew Thompson
Andrew Thompson

Reputation: 168845

  1. Use FontMetrics, GlyphView or the preferred size a JLabel (handy for getting the size needed to display formatted text.
  2. Adjust the sizes of the font in step 1 until it fits. Call BufferedImage.createGraphics() to get a Graphics2D object. Paint the String to that.
  3. I do not understand point 3, so won't comment.

Here is how it would work with either FontMetrics or a JLabel.

import java.awt.*;
import java.awt.image.*;
import java.awt.geom.Rectangle2D;
import javax.swing.*;

class TextSize {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                // Technique 1 - FontMetrics
                String s = "The quick brown fox jumps over the lazy dog!";
                BufferedImage bi = new BufferedImage(
                    1,
                    1,
                    BufferedImage.TYPE_INT_RGB);
                Graphics g = bi.getGraphics();
                FontMetrics fm = g.getFontMetrics();
                Rectangle2D b = fm.getStringBounds(s,g);
                System.out.println(b);
                bi = new BufferedImage(
                    (int)b.getWidth(),
                    (int)(b.getHeight() + fm.getDescent()),
                    BufferedImage.TYPE_INT_RGB);
                g = bi.getGraphics();
                g.drawString(s,0,(int)b.getHeight());

                JOptionPane.showMessageDialog(
                    null,
                    new JLabel(new ImageIcon(bi)));

                // Technique 3 - JLabel
                JLabel l = new JLabel(s);
                l.setSize(l.getPreferredSize());
                bi = new BufferedImage(
                    l.getWidth(),
                    l.getHeight(),
                    BufferedImage.TYPE_INT_RGB);
                g = bi.getGraphics();
                g.setColor(Color.WHITE);
                g.fillRect(0,0,400,100);
                l.paint(g);

                JOptionPane.showMessageDialog(
                    null,
                    new JLabel(new ImageIcon(bi)));
            }
        });
    }
}

Upvotes: 2

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