[LIBGDX学习]LibGDX代码详解（一）bitmap font

package com.mygdx.game;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Colors;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.BitmapFontCache;
import com.badlogic.gdx.graphics.g2d.GlyphLayout;
import com.badlogic.gdx.graphics.g2d.GlyphLayout.GlyphRun;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Label;
import com.badlogic.gdx.scenes.scene2d.ui.Skin;
import com.badlogic.gdx.scenes.scene2d.ui.Window;
import com.badlogic.gdx.utils.Align;
import com.badlogic.gdx.utils.viewport.ScreenViewport;
import com.mygdx.game.utils.GdxTest;

public class BitmapFontTest extends GdxTest {
    private Stage stage;
    private SpriteBatch spriteBatch;
    private BitmapFont font;
    private ShapeRenderer renderer;
    private BitmapFont multiPageFont;
    private GlyphLayout layout;
    private Label label;

    @Override
    public void create () {
        spriteBatch = new SpriteBatch();
        font = new BitmapFont(Gdx.files.internal("data/verdana39.fnt"), false);
        // font = new BitmapFont(Gdx.files.internal("data/arial-32-pad.fnt"), false);
        // font = new FreeTypeFontGenerator(Gdx.files.internal("data/arial.ttf")).generateFont(new FreeTypeFontParameter());
        font.getData().markupEnabled = true;
        font.getData().breakChars = new char[] {'-'};

        multiPageFont = new BitmapFont(Gdx.files.internal("data/multipagefont.fnt"));

        // Add user defined color
        Colors.put("PERU", Color.valueOf("CD853F"));
        Colors.put("USER1", Color.valueOf("F5E40A"));
        Colors.put("USER2", Color.valueOf("DC6839"));
        Colors.put("USER3", Color.valueOf("92B467"));
        Colors.put("USER4", Color.valueOf("51B181"));
        Colors.put("USER5", Color.valueOf("DCDCDC"));

        renderer = new ShapeRenderer();
        renderer.setProjectionMatrix(spriteBatch.getProjectionMatrix());

        stage = new Stage(new ScreenViewport());

        Skin skin = new Skin(Gdx.files.internal("data/uiskin.json"));

        BitmapFont labelFont = skin.get("default-font", BitmapFont.class);
        labelFont.getData().markupEnabled = true;// 这句没有，灰黑框里的就变成白色的，下面的彩色字也变成白色而且显示前面的[BLUE]这些标签

        // Notice that the last [] has been deliberately added to test the effect of excessive pop operations.
        // They are silently ignored, as expected.
        //label = new Label("<<[BLUE]M[RED]u[YELLOW]l[GREEN]t[OLIVE]ic[]o[]l[]o[]r[]*[MAROON]Label[][] [Unknown Color]>>", skin);
        label = new Label("<<[USER1]M[USER2]u[USER3]l[USER4]t[USER5]ic[PERU]o[]l[]o[]r[]*[MAROON]Label[][] [Unknown Color]>>", skin);
        label.setScale(8f);
        label.setPosition(100, 200);
        stage.addActor(label);

        Window window = new Window("[RED]Multicolor[GREEN] Title", skin);
        window.setPosition(400, 300);
        window.setSize(200,150);
        //window.pack();// 这句让窗体变得刚好和标题一样宽，没有长度
        stage.addActor(window);

        layout = new GlyphLayout();
    }

    @Override
    public void render () {
        // red.a = (red.a + Gdx.graphics.getDeltaTime() * 0.1f) % 1;

        int viewHeight = Gdx.graphics.getHeight();

        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        // Test wrapping or truncation with the font directly.
        if (!true) {// 直接true就执行!true就不执行
            // BitmapFont font = label.getStyle().font;
            BitmapFont font = this.font;
            font.getRegion().getTexture().setFilter(TextureFilter.Nearest, TextureFilter.Nearest);

            font.getData().setScale(2f);
            renderer.begin(ShapeRenderer.ShapeType.Line);
            renderer.setColor(0, 1, 0, 1);
            float w = Gdx.input.getX();
            // w = 855;
            renderer.rect(10, 10, w, 500);
            renderer.end();

            spriteBatch.begin();
            String text = "your new";
            text = "How quickly [RED]daft jumping zebras vex.";
            // text = "Another font wrap is-sue, this time with    multiple whitespace characters.";
            text = "test with AGWlWi      AGWlWi issue";
            if (true) { // Test wrap.
                layout.setText(font, text, 0, text.length(), font.getColor(), w, Align.center, true, null);
            } else { // Test truncation.
                layout.setText(font, text, 0, text.length(), font.getColor(), w, Align.center, false, "...");
            }
            float meowy = (500 / 2 + layout.height / 2 + 5);// layout.height 应该就是一行字高度的一半
            //float meowy = (500 / 2 + 5);
            //Gdx.app.log("Jacob",""+layout.height);
            font.draw(spriteBatch, layout, 10, 10 + meowy);
            spriteBatch.end();

            renderer.begin(ShapeRenderer.ShapeType.Line);
            renderer.setColor(0, 1, 0, 1);
            for (int i = 0, n = layout.runs.size; i < n; i++) {// runs 就是折行数？
                GlyphRun r = layout.runs.get(i);
                //Gdx.app.log("Jacobsize",""+layout.runs.size);
                renderer.rect(10 + r.x, 10 + meowy + r.y, r.width, -font.getLineHeight());
            }
            renderer.end();
            font.getData().setScale(1f);
            return;
        }

        // Test wrapping with label.
        if (!true) {
            //label.debug();// 显示绿框
            label.getStyle().font = font;// 把label的font字体设定设置成这里的font的字体设定
            label.setStyle(label.getStyle());
            label.setText("How quickly [RED]daft[] jumping zebras vex.");
            label.setWrap(true);
            //label.setWrap(false);
			//label.setEllipsis(true);
            label.setAlignment(Align.center, Align.right);
            label.setWidth(Gdx.input.getX() - label.getX());
            label.setHeight(label.getPrefHeight());
        } else {
            // Test various font features.
            spriteBatch.begin();

            String text = "Sphinx of black quartz, judge my vow.";
            font.setColor(Color.YELLOW);

            float x = 100, y = 20;
            float alignmentWidth;

            if (!true) {
                alignmentWidth = 0;
                font.draw(spriteBatch, text, x, viewHeight - y, alignmentWidth, Align.right, false);// 对其宽度是零，字符串直接被挤到屏幕外
            }

            if (true) {
                //alignmentWidth = 280;
                alignmentWidth = 140;
                font.draw(spriteBatch, text, x, viewHeight - y, alignmentWidth, Align.right, true);
            }

            font.draw(spriteBatch, "[", 50, 60, 100, Align.left, true);
            font.getData().markupEnabled = true;
            font.draw(spriteBatch, "[", 100, 60, 100, Align.left, true);
            font.getData().markupEnabled = false;

            // 'R' and 'p' are in different pages
            String txt2 = "this font uses " + multiPageFont.getRegions().size + " texture pages: RpRpRpRpRpNM";
            //Gdx.app.log("Jacob","render call before: "+spriteBatch.renderCalls);
            spriteBatch.renderCalls = 0;// 有没有这句都是零这句有啥用？
            //Gdx.app.log("Jacob","render call after: "+spriteBatch.renderCalls);
            // regular draw function
            multiPageFont.setColor(Color.BLUE);
            multiPageFont.draw(spriteBatch, txt2, 10, 100);

            // expert usage.. drawing with bitmap font cache
            // 下面这段为何没显示任何东西？
            BitmapFontCache cache = multiPageFont.getCache();
            cache.clear();
            cache.setColor(Color.BLACK);
            cache.setText(txt2, 10, 50);
            //cache.setText(txt2, 0, 0);
            cache.setColors(Color.PINK, 3, 6);
            cache.setColors(Color.ORANGE, 9, 12);
            cache.setColors(Color.GREEN, 16, txt2.length());
            cache.draw(spriteBatch, 5, txt2.length() - 5);//为何无用？？？？？
            //cache.draw(spriteBatch, 100, txt2.length());
            //cache.draw(spriteBatch, 200, txt2.length());

            cache.clear();
            cache.setColor(Color.BLACK);
            float textX = 10;
            textX += cache.setText("[black] ", textX, 150).width;
            multiPageFont.getData().markupEnabled = true;
            textX += cache.addText("[[[PINK]pink[]] ", textX, 150).width;
            textX += cache.addText("[PERU][[peru] ", textX, 150).width;
            cache.setColor(Color.GREEN);
            textX += cache.addText("green ", textX, 150).width;
            textX += cache.addText("[#A52A2A]br[#A52A2ADF]ow[#A52A2ABF]n f[#A52A2A9F]ad[#A52A2A7F]in[#A52A2A5F]g o[#A52A2A3F]ut ",// 透明度一直更改
                    textX, 150).width;
            multiPageFont.getData().markupEnabled = false;

            cache.draw(spriteBatch);

            // tinting
            cache.tint(new Color(1f, 1f, 1f, 0.3f));
            cache.translate(0f, 40f);
            cache.draw(spriteBatch);

            spriteBatch.end();
            // System.out.println(spriteBatch.renderCalls);

            renderer.begin(ShapeType.Line);
            //renderer.setColor(Color.BLACK);
            renderer.setColor(Color.WHITE);
            renderer.rect(x, viewHeight - y - 200, alignmentWidth, 200);
            renderer.end();
        }

        stage.act(Gdx.graphics.getDeltaTime());
        stage.draw();
    }

    public void resize (int width, int height) {
        spriteBatch.getProjectionMatrix().setToOrtho2D(0, 0, width, height);
        renderer.setProjectionMatrix(spriteBatch.getProjectionMatrix());
        stage.getViewport().update(width, height, true);
    }

    @Override
    public void dispose () {
        spriteBatch.dispose();
        renderer.dispose();
        font.dispose();

        // Restore predefined colors
        Colors.reset();
    }
}

注：libGDX官方测试源代码详解