libgdx 用纹理绘制简单界面

 

GameScreen
 public void render () {
  spriteBatch.begin();
// draw(Art.bg, -xLevel * 160, -yLevel * 120);
  draw(Art.bg, 0, 0);
  spriteBatch.end();
  level.render(this, camera);

  spriteBatch.begin();
  if (mayRespawn) {
   String msg = "PRESS X TO TRY AGAIN";
   drawString(msg, 160 - msg.length() * 3, 120 - 3);
  }
  if (Gdx.app.getType() == ApplicationType.Android) {
   draw(Art.buttons[0][0], 0, 240 - 32);
   draw(Art.buttons[1][0], 32, 240 - 32);

   draw(Art.buttons[4][0], 160 - 32, 240 - 32);
   draw(Art.buttons[5][0], 160, 240 - 32);

   draw(Art.buttons[2][0], 320 - 64, 240 - 32);
   draw(Art.buttons[3][0], 320 - 32, 240 - 32);
  }
  spriteBatch.end();
 }

//绘制纹理，完全可以认为绘制一个图片，默认情况
 public void draw (TextureRegion region, int x, int y) {
  int width = region.getRegionWidth();
  if (width < 0) width = -width;
  spriteBatch.draw(region, x, y, width, -region.getRegionHeight());
//高度是负数
//final float fx2 = x + width;
//final float fy2 = y + height;

 }

//绘制一个字符串
 public void drawString (String string, int x, int y) {
  string = string.toUpperCase();
  for (int i = 0; i < string.length(); i++) {
   char ch = string.charAt(i);
   for (int ys = 0; ys < chars.length; ys++) {
    int xs = chars[ys].indexOf(ch);
    if (xs >= 0) {
     draw(Art.guys[xs][ys + 9], x + i * 6, y);
    }
   }
  }
 }

//没什么奇怪的，就是用图片来代替文字
 public static void load () {
  bg = load("res/background.png", 320, 240);
  level = new Pixmap(Gdx.files.internal("res/levels.png"));
  titleScreen = load("res/titlescreen.png", 320, 740);
  guys = split("res/guys.png", 6, 6);
  player1 = split("res/player.png", 16, 32);
  player2 = split("res/player.png", 16, 32, true);
  walls = split("res/walls.png", 10, 10);
  gremlins = split("res/gremlins.png", 30, 30);
  buttons = split("res/buttons.png", 32, 32);
  shot = new TextureRegion(guys[0][0].getTexture(), 3, 27, 2, 2);
  winScreen1 = load("res/winscreen1.png", 320, 240);
  winScreen2 = load("res/winscreen2.png", 320, 240);
 }

guys = split("res/guys.png", 6, 6);

 private static TextureRegion[][] split (String name, int width, int height, boolean flipX) {
  Texture texture = new Texture(Gdx.files.internal(name));
  int xSlices = texture.getWidth() / width;
  int ySlices = texture.getHeight() / height;
  TextureRegion[][] res = new TextureRegion[xSlices][ySlices];
  for (int x = 0; x < xSlices; x++) {
   for (int y = 0; y < ySlices; y++) {
    res[x][y] = new TextureRegion(texture, x * width, y * height, width, height);
    res[x][y].flip(flipX, true);
   }
  }
  return res;
 }

//每6个像素一切，分成若干块， 注意这里再次强调TexttureRegion是通过像素来切分，和opengl的u,v分法不同，而且绘制也是按像素