How to use

prepareVertices

method

in

com.badlogic.gdx.graphics.g2d.NinePatch

public void draw (Batch batch, float x, float y, float width, float height) {
  prepareVertices(batch, x, y, width, height);
  batch.draw(texture, vertices, 0, idx);
}

public void draw (Batch batch, float x, float y, float width, float height) {
  prepareVertices(batch, x, y, width, height);
  batch.draw(texture, vertices, 0, idx);
}

public void draw (Batch batch, float x, float y, float originX, float originY, float width, float height, float scaleX,
  float scaleY, float rotation) {
  prepareVertices(batch, x, y, width, height);
  float worldOriginX = x + originX, worldOriginY = y + originY;
  int n = this.idx;
  float[] vertices = this.vertices;
  if (rotation != 0) {
    for (int i = 0; i < n; i += 5) {
      float vx = (vertices[i] - worldOriginX) * scaleX, vy = (vertices[i + 1] - worldOriginY) * scaleY;
      float cos = MathUtils.cosDeg(rotation), sin = MathUtils.sinDeg(rotation);
      vertices[i] = cos * vx - sin * vy + worldOriginX;
      vertices[i + 1] = sin * vx + cos * vy + worldOriginY;
    }
  } else if (scaleX != 1 || scaleY != 1) {
    for (int i = 0; i < n; i += 5) {
      vertices[i] = (vertices[i] - worldOriginX) * scaleX + worldOriginX;
      vertices[i + 1] = (vertices[i + 1] - worldOriginY) * scaleY + worldOriginY;
    }
  }
  batch.draw(texture, vertices, 0, n);
}

public void draw (Batch batch, float x, float y, float originX, float originY, float width, float height, float scaleX,
  float scaleY, float rotation) {
  prepareVertices(batch, x, y, width, height);
  float worldOriginX = x + originX, worldOriginY = y + originY;
  int n = this.idx;
  float[] vertices = this.vertices;
  if (rotation != 0) {
    for (int i = 0; i < n; i += 5) {
      float vx = (vertices[i] - worldOriginX) * scaleX, vy = (vertices[i + 1] - worldOriginY) * scaleY;
      float cos = MathUtils.cosDeg(rotation), sin = MathUtils.sinDeg(rotation);
      vertices[i] = cos * vx - sin * vy + worldOriginX;
      vertices[i + 1] = sin * vx + cos * vy + worldOriginY;
    }
  } else if (scaleX != 1 || scaleY != 1) {
    for (int i = 0; i < n; i += 5) {
      vertices[i] = (vertices[i] - worldOriginX) * scaleX + worldOriginX;
      vertices[i + 1] = (vertices[i + 1] - worldOriginY) * scaleY + worldOriginY;
    }
  }
  batch.draw(texture, vertices, 0, n);
}

public void draw (Batch batch, float x, float y, float width, float height) {
  prepareVertices(batch, x, y, width, height);
  batch.draw(texture, vertices, 0, idx);
}

public void draw (Batch batch, float x, float y, float originX, float originY, float width, float height, float scaleX,
  float scaleY, float rotation) {
  prepareVertices(batch, x, y, width, height);
  float worldOriginX = x + originX, worldOriginY = y + originY;
  int n = this.idx;
  float[] vertices = this.vertices;
  if (rotation != 0) {
    for (int i = 0; i < n; i += 5) {
      float vx = (vertices[i] - worldOriginX) * scaleX, vy = (vertices[i + 1] - worldOriginY) * scaleY;
      float cos = MathUtils.cosDeg(rotation), sin = MathUtils.sinDeg(rotation);
      vertices[i] = cos * vx - sin * vy + worldOriginX;
      vertices[i + 1] = sin * vx + cos * vy + worldOriginY;
    }
  } else if (scaleX != 1 || scaleY != 1) {
    for (int i = 0; i < n; i += 5) {
      vertices[i] = (vertices[i] - worldOriginX) * scaleX + worldOriginX;
      vertices[i + 1] = (vertices[i + 1] - worldOriginY) * scaleY + worldOriginY;
    }
  }
  batch.draw(texture, vertices, 0, n);
}