Animated rendering code for our dino.

main.dart

  return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Stack(
        alignment: Alignment.center,
        children: [
          AnimatedBuilder(
            animation: worldController,
            builder: (context, child) {
              Rect dinoRect = dino.getRect(screenSize, 0);
              return Positioned(
                left: dinoRect.left,
                top: dinoRect.top,
                width: dinoRect.width,
                height: dinoRect.height,
                child: dino.render(),
              );
            })
        ],
      ),
    );