在libgdx中居中对齐文本

Question

I have just started with LibGdx and I have figured out how to center text with it. Now I am having trouble with center justifying text. I was wondering if someone can help. I have attach my code for centering. Thank you in advance.

package com.tutorials.game;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.GlyphLayout;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class TextDemo extends ApplicationAdapter {
    SpriteBatch batch;
    BitmapFont font;
    String myText;
    GlyphLayout layout = new GlyphLayout();

    @Override
    public void create () {
        batch = new SpriteBatch();
        font = new BitmapFont(Gdx.files.internal("myFont.fnt"));
        myText = "I took one, one cause you left me\n"
               + "Two, two for my family\n"
               + "Three, three for my heartache";
        layout.setText(font,myText);
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        float x = Gdx.graphics.getWidth()/2 - layout.width/2;
        float y = Gdx.graphics.getHeight()/2 + layout.height/2;

        batch.begin();
        font.draw(batch,layout,x,y);//Center Text
        batch.end();
}

Answer 1

You can use following setText() method instead and set targetWidth to screen width, Aligh.center, and set wrap to true. Also, set x = 0 so the text is centered across the whole screen.

import com.badlogic.gdx.graphics.g2d.GlyphLayout;

public void setText(BitmapFont font,
                java.lang.CharSequence str,
                Color color,
                float targetWidth,
                int halign,
                boolean wrap)

Updated example:

@Override
public void create () {
    batch = new SpriteBatch();
    font = new BitmapFont(Gdx.files.internal("myFont.fnt"));
    myText = "I took one, one cause you left me\n"
           + "Two, two for my family\n"
           + "Three, three for my heartache";
    layout.setText(font,myText,Color.BLACK,Gdx.graphics.getWidth(),Align.center,true);
}

@Override
public void render () {
    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    float x = 0;
    float y = Gdx.graphics.getHeight()/2 + layout.height/2;

    batch.begin();
    font.draw(batch,layout,x,y);//Center Text
    batch.end();
}

Answer 2

Instead of using the font.draw method, use the following one instead...

public TextBounds drawMultiLine (Batch batch, CharSequence str, float x, float y, float alignmentWidth, HAlignment alignment)

alignmentWidth is the max width you want your text to take up. Any more than that and it will wrap. Set it to something stupidly high if you don't want wrapping.

'alignment' is the key thing and takes an HAlignment enum and can be either LEFT , RIGHT or CENTER

The batch , str , x and y parameters are the same as you're already doing.