C# - Düşen Şeker Vurma Oyunu

KODLAR

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        Graphics tuval;
        Pen kalem = new Pen(Color.Black , 3 );
        int x, y, x1=0, y1=0, x2 = 0, y2 = 0,xk;
        bool atis = false;
        int px1, px2, px3, px4;
        int py1, py2, py3, py4;
        Random Rastgele = new Random();
        int puanlama = 0;

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            x = Cursor.Position.X;
            y = Cursor.Position.Y;
            Point P = PointToScreen(new Point(pictureBox1.Bounds.Left, pictureBox1.Bounds.Top));
            xk = x - P.X;
            x1 = Convert.ToInt16( Math.Abs(450 - (x - P.X)) / 5 );
            y1 = Convert.ToInt16( Math.Abs(400 - (y - P.Y)) / 5);
            x2 = 450;
            y2 = 400;
            atis = true;
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox2.Parent = pictureBox1;
            pictureBox2.BackColor = Color.Transparent;

            pictureBox3.Parent = pictureBox1;
            pictureBox3.BackColor = Color.Transparent;

            pictureBox4.Parent = pictureBox1;
            pictureBox4.BackColor = Color.Transparent;

            pictureBox5.Parent = pictureBox1;
            pictureBox5.BackColor = Color.Transparent;

            tuval = pictureBox1.CreateGraphics();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            timer1.Interval = 100;
            timer1.Start();

            px1 = Rastgele.Next(50,850);
            py1 = 0;
            pictureBox2.Location = new Point(px1,py1);

            px2 = Rastgele.Next(50, 850);
            py2 = 0;
            pictureBox3.Location = new Point(px2, py2);

            px3 = Rastgele.Next(50, 850);
            py3 = 0;
            pictureBox4.Location = new Point(px3, py3);

            px4 = Rastgele.Next(50, 850);
            py4 = 0;
            pictureBox5.Location = new Point(px4, py4);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            pictureBox1.Refresh();

            x = Cursor.Position.X;
            y = Cursor.Position.Y;
            Point P = PointToScreen(new Point(pictureBox1.Bounds.Left, pictureBox1.Bounds.Top));
            x = x - P.X;
            y = y - P.Y;

            if (atis)
            {
                if (xk < 450)
                {
                    x2 = x2 - x1;
                }
                else
                {
                    x2 = x2 + x1;
                }
                y2 = y2 - y1;
                tuval.DrawRectangle(kalem, x2, y2, 5, 5);
            }
            

            tuval.DrawLine(kalem, 450 , 400 , x , y);
            tuval.DrawLine(kalem, x - 25 , y , x + 25 , y);
            tuval.DrawLine(kalem, x , y - 25 , x , y + 25);
            tuval.DrawEllipse(kalem , x - 10 , y - 10 , 20 , 20);
            tuval.DrawArc(kalem , 425 , 375 , 50 , 50 , 270 , 360);

            //nesnelerin hareketinin saglanması
            py1 = py1 + Rastgele.Next(5,20);
            pictureBox2.Location = new Point(px1,py1);

            py2 = py2 + Rastgele.Next(5, 20);
            pictureBox3.Location = new Point(px2, py2);

            py3 = py3 + Rastgele.Next(5, 20);
            pictureBox4.Location = new Point(px3, py3);

            py4 = py4 + Rastgele.Next(5, 20);
            pictureBox5.Location = new Point(px4, py4);

            //oyun dışına çıkan nesnelerin başlangıç noktasından tekrar başlatılması
            if (py1 > 400)
            {
                py1 = -30;
                px1 = Rastgele.Next(50,850);
            }
            if (py2 > 400)
            {
                py2 = -30;
                px2 = Rastgele.Next(50, 850);
            }
            if (py3 > 400)
            {
                py3 = -30;
                px3 = Rastgele.Next(50, 850);
            }
            if (py4 > 400)
            {
                py4 = -30;
                px4 = Rastgele.Next(50, 850);
            }

            //vurma olayının gerçekleştirilmesi
            if (x2 > px1 && y2 > py1 && x2 < px1 + 30 && y2 < py1 + 30 )
            {
                py1 = -30;
                px1 = Rastgele.Next(50, 850);
                puanlama = puanlama + 10;
            }
            if (x2 > px2 && y2 > py2 && x2 < px2 + 30 && y2 < py2 + 30)
            {
                py2 = -30;
                px2 = Rastgele.Next(50, 850);
                puanlama = puanlama + 10;
            }
            if (x2 > px3 && y2 > py3 && x2 < px3 + 30 && y2 < py3 + 30)
            {
                py3 = -30;
                px3 = Rastgele.Next(50, 850);
                puanlama = puanlama + 10;
            }
            if (x2 > px4 && y2 > py4 && x2 < px4 + 30 && y2 < py4 + 30)
            {
                py4 = -30;
                px4 = Rastgele.Next(50, 850);
                puanlama = puanlama + 10;
            }
            label2.Text = Convert.ToString(puanlama);
        }
    }
}