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Example Bounds

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In H2D getting the local transformed bounding box of an object is as simple as calling getBounds().

class Bounds extends hxd.App {

  var boxes : Array<h2d.Bitmap>;
  var g : h2d.Graphics;
  var colors = [0xFF0000 , 0x00FF00 , 0x0000FF, 0xFF00FF];
  var time = 0.;

  override function init() {
    boxes = [];

    g = new h2d.Graphics(s2d);
    for( i in 0...colors.length ) {
      var size = Std.int(200 / (i + 4));
      var c = colors[i];
      var b = new h2d.Bitmap(h2d.Tile.fromColor(c, size, size, 0.5).sub(0, 0, size, size, -Std.random(size), -Std.random(size)), i == 0 ? s2d : boxes[i - 1]);
      b.addChild(new h2d.Bitmap(h2d.Tile.fromColor(0xFFFFFF, 8, 8).sub(0, 0, 8, 8, -4, -4)));
      if( i == 0 ) {
        b.x = s2d.width * 0.5;
        b.y = s2d.height * 0.5;
      } else {
        b.x = Std.random(50) - 25;
        b.y = Std.random(50) - 25;
        if( b.x < 0 ) b.x -= size * 1.5 else b.x += size * 1.5;
        if( b.y < 0 ) b.y -= size * 1.5 else b.y += size * 1.5;
      }
      b.scale(1.2 - i * 0.1);
      boxes.push(b);
    }
    for( b in boxes )
      new h2d.Graphics(b);

    var tf = new h2d.Text(hxd.Res.customFont.toFont(), boxes[0]);
    tf.text = "Some quite long rotating text";
    tf.x = -5;
    tf.y = 15;
    tf.smooth = true;
  }

  override function update(dt:Float) {
    time += dt;
    g.clear();
    for( i in 0...boxes.length ) {
      var b = boxes[i];
      b.rotate( (i + 1) * dt * 0.06 );
      b.setScale(1 + Math.sin(time * 0.1 / (i + 2)) * 0.2);
      var b = b.getBounds();
      g.beginFill((colors[i]>>2)&0x3F3F3F);
      g.drawRect(b.x, b.y, b.width, b.height);
    }
    for( i in 1...2 ) {
      var prev = boxes[i - 1];
      var b = boxes[i].getBounds(prev);
      var g = Std.instance(prev.getChildAt(2), h2d.Graphics);
      g.clear();
      g.beginFill(0xFFFFFF, 0.5);
      g.drawRect(b.x, b.y, b.width, b.height);
    }
  }

  static function main() {
    hxd.Res.initEmbed();
    new Bounds();
  }

}

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