LIBGDX实时绘制字符、实时绘制中文

实时绘制字符、实时绘制中文"/>

LIBGDX实时绘制字符、实时绘制中文

LIBGDX实时绘制字符、实时绘制中文

转自：/archives/libgdx-shi-shi-hui-zhi-zi-fu

注意，相比于贴图字体，实时绘制会有一定的失真、模糊

Maven项目依赖：

<properties><mavenpiler.source>17</mavenpiler.source><mavenpiler.target>17</mavenpiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><gdx.version>1.12.0</gdx.version></properties><dependencies><!-- .badlogicgames.gdx/gdx --><dependency><groupId>com.badlogicgames.gdx</groupId><artifactId>gdx</artifactId><version>${gdx.version}</version></dependency><!-- .badlogicgames.gdx/gdx-backend-lwjgl3 --><dependency><groupId>com.badlogicgames.gdx</groupId><artifactId>gdx-backend-lwjgl3</artifactId><version>${gdx.version}</version></dependency><!-- .badlogicgames.gdx/gdx-platform --><dependency><groupId>com.badlogicgames.gdx</groupId><artifactId>gdx-platform</artifactId><version>${gdx.version}</version><classifier>natives-desktop</classifier></dependency><!-- .badlogicgames.gdx/gdx-freetype --><dependency><groupId>com.badlogicgames.gdx</groupId><artifactId>gdx-freetype</artifactId><version>${gdx.version}</version></dependency><!-- .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><!-- .slf4j/slf4j-api --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>2.0.9</version></dependency><!-- .slf4j/slf4j-simple --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-simple</artifactId><version>2.0.9</version></dependency><!-- .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>/</url><snapshots><enabled>false</enabled></snapshots><releases><enabled>true</enabled></releases></repository><repository><id>nexus</id><name>Nexus</name><layout>default</layout><url>;/url><snapshots><enabled>true</enabled></snapshots><releases><enabled>true</enabled></releases></repository><repository><id>aliyunmaven</id><url>;/url><releases><enabled>true</enabled></releases><snapshots><enabled>false</enabled></snapshots></repository></repositories>

重写字体

package top.lingkang.yzcymon.font;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.GlyphAndBitmap;
import com.badlogic.gdx.utils.GdxRuntimeException;import java.lang.reflect.Field;/*** 对BitmapFont对字体进行实时绘制，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 RealBitmapFont extends BitmapFont {// 不应该在此对此进行 dispose ，让上层进行 disposeprivate final FreeTypeFontGenerator generator;private final FreeTypeBitmapFontData data;// 翻转private boolean flip;public RealBitmapFont(FreeTypeFontGenerator generator, int fontSize) {if (generator == null)throw new GdxRuntimeException("FreeTypeFontGenerator 不能为空");this.generator = generator;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();}public RealBitmapFont setLineHeight(int lineHeight) {data.lineHeight = lineHeight;data.down = -data.lineHeight;return this;}public boolean isFlip() {return flip;}public void setFlip(boolean flip) {this.flip = flip;}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 dataSizeMetrics fontMetrics = face.getSize().getMetrics();// Set space glyph.Glyph spaceGlyph = data.getGlyph(' ');if (spaceGlyph == null) {spaceGlyph = new Glyph();spaceGlyph.xadvance = (int) data.scaleX;//spaceWidthspaceGlyph.id = (int) ' ';data.setGlyph(' ', spaceGlyph);}if (spaceGlyph.width == 0)spaceGlyph.width = (int) (spaceGlyph.xadvance + data.padRight);// set general font datadata.flipped = flip;data.ascent = FreeType.toInt(fontMetrics.getAscender());data.descent = FreeType.toInt(fontMetrics.getDescender());data.lineHeight = FreeType.toInt(fontMetrics.getHeight());// determine x-heightfor (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 heightif (data.capHeight == 1)throw new GdxRuntimeException("No cap character found in font");data.ascent = data.ascent - data.capHeight;data.down = -data.lineHeight;if (flip) {data.ascent = -data.ascent;data.down = -data.down;}}@Overridepublic void dispose() {setOwnsTexture(true);super.dispose();data.dispose();}protected class LazyBitmapFontData extends FreeTypeBitmapFontData {private final FreeTypeFontGenerator generator;private final int fontSize;private final RealBitmapFont font;private int page = 1;public LazyBitmapFontData(FreeTypeFontGenerator generator, int fontSize, RealBitmapFont lbf) {this.generator = generator;this.fontSize = fontSize;this.font = lbf;}public Glyph getGlyph(char ch) {Glyph glyph = super.getGlyph(ch);if (glyph == null)// 找不到时手动绘制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: chreturn null;Pixmap map = gab.bitmap.getPixmap(Format.RGBA8888, getColor(), 1.8f);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;}}
}

调用

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.graphics.Color;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import org.junit.Test;
import top.lingkang.yzcymon.font.RealBitmapFont;/*** @author lingkang* created by 2023/11/1*/
public class TestTxt extends ApplicationAdapter {@Testpublic 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 systemFont;// 系统字体protected BitmapFont bitmapFont2;// 动态绘制字体//加载 仿宋字体FreeTypeFontGenerator generator;@Overridepublic void create() {batch = new SpriteBatch();generator = new FreeTypeFontGenerator(Gdx.files.absolute("C:\\Windows\\Fonts\\simfang.ttf"));// 默认字体FreeTypeFontGenerator.FreeTypeFontParameter parameter = new FreeTypeFontGenerator.FreeTypeFontParameter();parameter.size = 18;parameter.characters = "abcABC$%&* 欢迎"; // 默认字体需要提前设置好字符systemFont = generator.generateFont(parameter);// 实时绘制字体bitmapFont2 = new RealBitmapFont(generator, 18);bitmapFont2.setColor(Color.WHITE);}@Overridepublic void render() {batch.begin();systemFont.draw(batch, "abc ABC $%&* 欢迎", 0, 300);// 左下角起点，向上300个高度bitmapFont2.draw(batch, "abc ABC $%&* 欢迎", 0, 250);batch.end();}@Overridepublic void dispose() {batch.dispose();systemFont.dispose();bitmapFont2.dispose();generator.dispose();}
}

效果