{
  "model":
  {
    "stage":
    { "view":   "stage", "class": "ImmovableStage", "isMovable": false,
      "width":  "@width",
      "height": "@height"
    },

    "birds":
    [ { "@count": 25,
        "view":   "hen", "class": "MovableCircle", "isMovable": true,
        "r":      { "@min":  25, "@max": 40 },
        "x":      { "@min": 0.2, "@max": 0.8, "@relative": "@width" },
        "y":      { "@min": 0.2, "@max": 0.8, "@relative": "@height" },
        "vx":     { "@min":  50, "@max": 100, "@positive": 0.5 },
        "vy":     { "@min":  50, "@max": 100, "@positive": 0.5 }
      }
    ]
  },

  "view":
  {
    "stage":
    { "class":    "ViewTextureStage",
      "resource": "background",
      "width":    "@width",
      "height":   "@height"
    },

    "hen":
    { "class":          "ViewAnimatedBird",
      "control":        "controlBird",
      "r":              "@birdRadius",
      "animation":      [ "hen1.png", "hen2.png", "hen3.png", "hen4.png" ],
      "animationSpeed": { "@min": 0.05, "@max": 0.15 },
      "start":          "play"
    }
  }
}