LiteCraft/src/main/java/io/github/hydos/ginger/engine/font/TextMeshCreator.java

package io.github.hydos.ginger.engine.font;

import java.util.*;

public class TextMeshCreator
{
	protected static final double LINE_HEIGHT = 0.03f;
	protected static final int SPACE_ASCII = 32;
	private MetaFile metaData;

	protected TextMeshCreator(String metaFile)
	{ metaData = new MetaFile(metaFile); }

	protected TextMeshData createTextMesh(GUIText text)
	{
		List<Line> lines = createStructure(text);
		TextMeshData data = createQuadVertices(text, lines);
		return data;
	}

	private List<Line> createStructure(GUIText text)
	{
		char[] chars = text.getTextString().toCharArray();
		List<Line> lines = new ArrayList<Line>();
		Line currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
		Word currentWord = new Word(text.getFontSize());
		for (char c : chars)
		{
			int ascii = c;
			if (ascii == SPACE_ASCII)
			{
				boolean added = currentLine.attemptToAddWord(currentWord);
				if (!added)
				{
					lines.add(currentLine);
					currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
					currentLine.attemptToAddWord(currentWord);
				}
				currentWord = new Word(text.getFontSize());
				continue;
			}
			Character character = metaData.getCharacter(ascii);
			currentWord.addCharacter(character);
		}
		completeStructure(lines, currentLine, currentWord, text);
		return lines;
	}

	private void completeStructure(List<Line> lines, Line currentLine, Word currentWord, GUIText text)
	{
		boolean added = currentLine.attemptToAddWord(currentWord);
		if (!added)
		{
			lines.add(currentLine);
			currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
			currentLine.attemptToAddWord(currentWord);
		}
		lines.add(currentLine);
	}

	private TextMeshData createQuadVertices(GUIText text, List<Line> lines)
	{
		text.setNumberOfLines(lines.size());
		double curserX = 0f;
		double curserY = 0f;
		List<Float> vertices = new ArrayList<Float>();
		List<Float> textureCoords = new ArrayList<Float>();
		for (Line line : lines)
		{
			if (text.isCentered())
			{ curserX = (line.getMaxLength() - line.getLineLength()) / 2; }
			for (Word word : line.getWords())
			{
				for (Character letter : word.getCharacters())
				{
					addVerticesForCharacter(curserX, curserY, letter, text.getFontSize(), vertices);
					addTexCoords(textureCoords, letter.getxTextureCoord(), letter.getyTextureCoord(),
						letter.getXMaxTextureCoord(), letter.getYMaxTextureCoord());
					curserX += letter.getxAdvance() * text.getFontSize();
				}
				curserX += metaData.getSpaceWidth() * text.getFontSize();
			}
			curserX = 0;
			curserY += LINE_HEIGHT * text.getFontSize();
		}
		return new TextMeshData(listToArray(vertices), listToArray(textureCoords));
	}

	private void addVerticesForCharacter(double curserX, double curserY, Character character, double fontSize,
		List<Float> vertices)
	{
		double x = curserX + (character.getxOffset() * fontSize);
		double y = curserY + (character.getyOffset() * fontSize);
		double maxX = x + (character.getSizeX() * fontSize);
		double maxY = y + (character.getSizeY() * fontSize);
		double properX = (2 * x) - 1;
		double properY = (-2 * y) + 1;
		double properMaxX = (2 * maxX) - 1;
		double properMaxY = (-2 * maxY) + 1;
		addVertices(vertices, properX, properY, properMaxX, properMaxY);
	}

	private static void addVertices(List<Float> vertices, double x, double y, double maxX, double maxY)
	{
		vertices.add((float) x);
		vertices.add((float) y);
		vertices.add((float) x);
		vertices.add((float) maxY);
		vertices.add((float) maxX);
		vertices.add((float) maxY);
		vertices.add((float) maxX);
		vertices.add((float) maxY);
		vertices.add((float) maxX);
		vertices.add((float) y);
		vertices.add((float) x);
		vertices.add((float) y);
	}

	private static void addTexCoords(List<Float> texCoords, double x, double y, double maxX, double maxY)
	{
		texCoords.add((float) x);
		texCoords.add((float) y);
		texCoords.add((float) x);
		texCoords.add((float) maxY);
		texCoords.add((float) maxX);
		texCoords.add((float) maxY);
		texCoords.add((float) maxX);
		texCoords.add((float) maxY);
		texCoords.add((float) maxX);
		texCoords.add((float) y);
		texCoords.add((float) x);
		texCoords.add((float) y);
	}

	private static float[] listToArray(List<Float> listOfFloats)
	{
		float[] array = new float[listOfFloats.size()];
		for (int i = 0; i < array.length; i++)
		{ array[i] = listOfFloats.get(i); }
		return array;
	}
}