source: 2015/23/JouniP/HienoPallopeli/HienoPallopeli/HienoPallopeli/HienoPallopeli.cs @ 5857

using System;
using System.Collections.Generic;
using Jypeli;
using Jypeli.Assets;
using Jypeli.Controls;
using Jypeli.Effects;
using Jypeli.Widgets;

public class HienoPallopeli : PhysicsGame
{
    public override void Begin()
    {
        Level.CreateBorders(true);

        for (int i = 0; i < 40; i++)
        {
            LisaaPallo();
        }

        Camera.ZoomToAllObjects();
        Keyboard.Listen(Key.Escape, ButtonState.Pressed, ConfirmExit, "Lopeta peli");
    }

    public void LisaaPallo()
    {
        PhysicsObject pallo = new PhysicsObject(50, 50);
        pallo.Shape = Shape.Circle;
        pallo.Position = RandomGen.NextVector(Level.Left, Level.Bottom, Level.Right, Level.Top);
        pallo.Color = RandomGen.NextColor();
        pallo.Tag = "ympyra";
        pallo.Restitution = 1.0;
        pallo.KineticFriction = 0.1;
        Add(pallo);

        Vector impulssi = RandomGen.NextVector(10, 200);
        pallo.Hit(impulssi);

        AddCollisionHandler(pallo, "ympyra", PalloTormasi);
    }

    void PalloTormasi(PhysicsObject tormaaja, PhysicsObject kohde)
    {
        tormaaja.Color = Color.Lerp(tormaaja.Color, kohde.Color, 0.5);
    }
}