/*

ahbejarano

Game item wrapper class.

*/

package geetransit.minecraft05.engine;

import java.util.*;

import java.nio.charset.Charset;

import org.joml.Vector4f;

public class TextItem extends Item {

private static final float ZPOS = 0f;

private static final int VERTICES_PER_QUAD = 4;

private String text;

private final int fontCols;

private final int fontRows;

public TextItem(String text, String fontFile, int fontCols, int fontRows) throws Exception {

super();

this.text = text;

this.fontCols = fontCols;

this.fontRows = fontRows;

this.mesh = this.buildMesh(new Texture(fontFile));

}

public String getText() { return this.text; }

public int getFontCols() { return this.fontCols; }

public int getFontRows() { return this.fontRows; }

public Item setText(String text) {

this.text = text;

Vector4f color = this.mesh.getColor();

this.mesh.cleanup(false);

this.mesh = this.buildMesh(this.mesh.getTexture());

this.mesh.setColor(color);

return this;

}

private Mesh buildMesh(Texture texture) {

byte[] charArray = this.text.getBytes(Charset.forName("ISO-8859-1"));

List<Float> posList = new ArrayList<>();

List<Float> coordList = new ArrayList<>();

List<Integer> indexList = new ArrayList<>();

float width = (float) texture.getWidth() / this.fontCols;

float length = (float) texture.getLength() / this.fontRows;

int currentCol = 0;

int currentRow = 0;

int currentIndex = 0;

for (int i = 0; i < charArray.length; i++) {

byte currentChar = charArray[i];

if (currentChar == '\n') {

currentRow++;

currentCol = 0;

continue;

}

// Build a character tile composed by two triangles

int fontCol = currentChar % this.fontCols;

int fontRow = currentChar / this.fontCols;

// Left Top vertex

posList.add(currentCol*width); // x

posList.add(currentRow*length); // y

posList.add(ZPOS); // z

coordList.add((float) fontCol / this.fontCols);

coordList.add((float) fontRow / this.fontRows);

indexList.add(currentIndex*VERTICES_PER_QUAD + 0);

// Left Bottom vertex

posList.add(currentCol*width); // x

posList.add(currentRow*length + length); // y

posList.add(ZPOS); // z

coordList.add((float) fontCol / this.fontCols);

coordList.add((float) (fontRow + 1) / this.fontRows);

indexList.add(currentIndex*VERTICES_PER_QUAD + 1);

// Right Bottom vertex

posList.add(currentCol*width + width); // x

posList.add(currentRow*length + length); // y

posList.add(ZPOS); // z

coordList.add((float) (fontCol + 1) / this.fontCols);

coordList.add((float) (fontRow + 1) / this.fontRows);

indexList.add(currentIndex*VERTICES_PER_QUAD + 2);

// Right Top vertex

posList.add(currentCol*width + width); // x

posList.add(currentRow*length); // y

posList.add(ZPOS); // z

coordList.add((float) (fontCol + 1) / this.fontCols);

coordList.add((float) fontRow / this.fontRows);

indexList.add(currentIndex*VERTICES_PER_QUAD + 3);

// Add indices for left top and bottom right vertices

indexList.add(currentIndex*VERTICES_PER_QUAD + 0);

indexList.add(currentIndex*VERTICES_PER_QUAD + 2);

currentCol++;

currentIndex++;

}

float[] posArray = Utils.floatListToArray(posList);

float[] coordArray = Utils.floatListToArray(coordList);

int[] indexArray = Utils.intListToArray(indexList);

return new Mesh(posArray, indexArray, coordArray).setTexture(texture);

}

}