libgdx实现文本居中、libgdx文字居中、GlyphLayout文本居中
libgdx实现文本居中、libgdx文字居中、GlyphLayout文本居中，环境jdk 17+，2023年11月1日14:20:18最新。
转自：https://lingkang.top/archives/libgdx-shi-xian-wen-ben-ju-zhong
依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>top.lingkang</groupId>
<artifactId>yzcy</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<gdx.version>1.12.0</gdx.version>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/com.badlogicgames.gdx/gdx -->
<dependency>
<groupId>com.badlogicgames.gdx</groupId>
<artifactId>gdx</artifactId>
<version>${gdx.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.badlogicgames.gdx/gdx-backend-lwjgl3 -->
<dependency>
<groupId>com.badlogicgames.gdx</groupId>
<artifactId>gdx-backend-lwjgl3</artifactId>
<version>${gdx.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.badlogicgames.gdx/gdx-platform -->
<dependency>
<groupId>com.badlogicgames.gdx</groupId>
<artifactId>gdx-platform</artifactId>
<version>${gdx.version}</version>
<classifier>natives-desktop</classifier>
</dependency>
<!-- https://mvnrepository.com/artifact/com.badlogicgames.gdx/gdx-freetype -->
<dependency>
<groupId>com.badlogicgames.gdx</groupId>
<artifactId>gdx-freetype</artifactId>
<version>${gdx.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.badlogicgames.gdx/gdx-freetype-platform -->
<dependency>
<groupId>com.badlogicgames.gdx</groupId>
<artifactId>gdx-freetype-platform</artifactId>
<version>${gdx.version}</version>
<classifier>natives-desktop</classifier>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>2.0.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.30</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>17</source>
<target>17</target>
<!-- 编译后保持方法形参名称不变 -->
<!--<compilerArgs>
<arg>-parameters</arg>
</compilerArgs>-->
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>tencent</id>
<name>tencent</name>
<layout>default</layout>
<url>http://mirrors.cloud.tencent.com/nexus/repository/maven-public/</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
<releases>
<enabled>true</enabled>
</releases>
</repository>
<repository>
<id>nexus</id>
<name>Nexus</name>
<layout>default</layout>
<url>https://s01.oss.sonatype.org/content/repositories/snapshots</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
<releases>
<enabled>true</enabled>
</releases>
</repository>
<repository>
<id>aliyunmaven</id>
<url>https://maven.aliyun.com/repository/public</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
重写类
package top.lingkang.yzcy.utils;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.graphics.g2d.freetype.FreeType;
import com.badlogic.gdx.graphics.g2d.freetype.FreeType.Face;
import com.badlogic.gdx.graphics.g2d.freetype.FreeType.SizeMetrics;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator.FreeTypeBitmapFontData;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator.FreeTypeFontParameter;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator.GlyphAndBitmap;
import com.badlogic.gdx.utils.GdxRuntimeException;
import java.lang.reflect.Field;
/**
* 对BitmapFont进行改写，让文字获取直接从字体中获取
* 调用方式：
* <pre>
* protected BitmapFont bitmapFont; <br/>
* //加载 仿宋字体
* FreeTypeFontGenerator generator = new FreeTypeFontGenerator(new FileHandle("C:\\Windows\\Fonts\\simfang.ttf"));
* <br/> <br/>
* bitmapFont = new SmartBitmapFont(generator,50);
*
* <br/>
* bitmapFont.draw(batch, "欢迎", 0, 300);// 左下角起点，向上300个高度
* </pre>
*/
public class SmartBitmapFont extends BitmapFont {
// 不应该在此对此进行 dispose ，让上层进行 dispose
private FreeTypeFontGenerator generator;
private FreeTypeBitmapFontData data;
private FreeTypeFontParameter parameter;
public SmartBitmapFont(FreeTypeFontGenerator generator, int fontSize) {
if (generator == null)
throw new GdxRuntimeException("lazyBitmapFont global generator must be not null to use this constructor.");
this.generator = generator;
FreeTypeFontParameter param = new FreeTypeFontParameter();
param.size = fontSize;
this.parameter = param;
this.data = new LazyBitmapFontData(generator, fontSize, this);
try {
Field f = getClass().getSuperclass().getDeclaredField("data");
f.setAccessible(true);
f.set(this, data);
} catch (Exception e) {
e.printStackTrace();
}
genrateData();
}
private void genrateData() {
Face face = null;
try {
Field field = generator.getClass().getDeclaredField("face");
field.setAccessible(true);
face = (Face) field.get(generator);
} catch (Exception e) {
e.printStackTrace();
return;
}
// set general font data
SizeMetrics fontMetrics = face.getSize().getMetrics();
// Set space glyph.
Glyph spaceGlyph = data.getGlyph(' ');
if (spaceGlyph == null) {
spaceGlyph = new Glyph();
spaceGlyph.xadvance = (int) data.scaleX;//spaceWidth
spaceGlyph.id = (int) ' ';
data.setGlyph(' ', spaceGlyph);
}
if (spaceGlyph.width == 0)
spaceGlyph.width = (int) (spaceGlyph.xadvance + data.padRight);
// set general font data
data.flipped = parameter.flip;
data.ascent = FreeType.toInt(fontMetrics.getAscender());
data.descent = FreeType.toInt(fontMetrics.getDescender());
data.lineHeight = FreeType.toInt(fontMetrics.getHeight());
// determine x-height
for (char xChar : data.xChars) {
if (!face.loadChar(xChar, FreeType.FT_LOAD_DEFAULT))
continue;
data.xHeight = FreeType.toInt(face.getGlyph().getMetrics().getHeight());
break;
}
if (data.xHeight == 0)
throw new GdxRuntimeException("No x-height character found in font");
for (char capChar : data.capChars) {
if (!face.loadChar(capChar, FreeType.FT_LOAD_DEFAULT))
continue;
data.capHeight = FreeType.toInt(face.getGlyph().getMetrics().getHeight());
break;
}
// determine cap height
if (data.capHeight == 1)
throw new GdxRuntimeException("No cap character found in font");
data.ascent = data.ascent - data.capHeight;
data.down = -data.lineHeight;
if (parameter.flip) {
data.ascent = -data.ascent;
data.down = -data.down;
}
}
@Override
public void dispose() {
setOwnsTexture(true);
super.dispose();
data.dispose();
}
class LazyBitmapFontData extends FreeTypeBitmapFontData {
private FreeTypeFontGenerator generator;
private int fontSize;
private SmartBitmapFont font;
private int page = 1;
public LazyBitmapFontData(FreeTypeFontGenerator generator, int fontSize, SmartBitmapFont lbf) {
this.generator = generator;
this.fontSize = fontSize;
this.font = lbf;
}
public Glyph getGlyph(char ch) {
Glyph glyph = super.getGlyph(ch);
if (glyph == null)
glyph = generateGlyph(ch);
return glyph;
}
protected Glyph generateGlyph(char ch) {
GlyphAndBitmap gab = generator.generateGlyphAndBitmap(ch, fontSize, false);
if (gab == null || gab.bitmap == null)// 未找到文字字符: ch
return null;
Pixmap map = gab.bitmap.getPixmap(Format.RGBA8888, Color.WHITE, 9);
TextureRegion rg = new TextureRegion(new Texture(map));
map.dispose();
font.getRegions().add(rg);
gab.glyph.page = page++;
super.setGlyph(ch, gab.glyph);
setGlyphRegion(gab.glyph, rg);
return gab.glyph;
}
}
}
文字居中
import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.GlyphLayout;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.utils.Align;
import org.junit.Test;
import top.lingkang.yzcy.utils.SmartBitmapFont;
/**
* @author lingkang
* created by 2023/11/1
*/
public class TestTxtCenter extends ApplicationAdapter {
@Test
public void test() {
Lwjgl3ApplicationConfiguration config = new Lwjgl3ApplicationConfiguration();
config.setForegroundFPS(30);
config.setTitle("yzcy");
config.setWindowedMode(800, 600);
new Lwjgl3Application(this, config);
}
protected SpriteBatch batch;
protected BitmapFont bitmapFont;
GlyphLayout layout = new GlyphLayout();
//加载 仿宋字体
FreeTypeFontGenerator generator = new FreeTypeFontGenerator(new FileHandle("C:\\Windows\\Fonts\\simfang.ttf"));
@Override
public void create() {
bitmapFont = new SmartBitmapFont(generator, 50);
batch = new SpriteBatch();
// 居中
layout.setText(bitmapFont, "欢迎", Color.WHITE, Gdx.graphics.getWidth(), Align.center, true);
}
@Override
public void render() {
batch.begin();
bitmapFont.draw(batch, layout, 0, 300);// 左下角起点，向上300个高度
batch.end();
}
@Override
public void dispose() {
batch.dispose();
bitmapFont.dispose();
generator.dispose();
}
}
效果
