C# Samples : 포물선 운동 (Parabolic Motion)

 

 

 

using System;
using System.Windows.Forms;
using System.Drawing;


class ParabolicMotion
{
    public static void Main()
    {
        // Constants //
        Constants cts = new Constants();
        Form fm = new Form();
        PictureBox pb = new PictureBox();
        Image img_bg_day = Image.FromFile(cts.dir_img_bg_day);
        double ball_x = cts.ball_initial_x;
        double ball_y = cts.ball_initial_y;
        double ball_velocity_x = cts.ball_initial_velocity_x;
        double ball_velocity_y = cts.ball_initial_velocity_y;
        double ball_angle = cts.ball_initial_angle;
        Timer tm = new Timer();


        // Settings //
        fm.ClientSize = new Size(cts.form_client_size_width, cts.form_client_size_height);

        pb.Parent = fm;
        pb.Width = cts.form_client_size_width;
        pb.Height = cts.form_client_size_height;

        tm.Interval = cts.timer_interval;

        Console.WriteLine(cts.ball_initial_velocity_x);
        Console.WriteLine(cts.ball_initial_velocity_y);


        // Events //
        void fm_paint_bg(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.DrawImage(img_bg_day, 0, 0, cts.form_client_size_width, cts.form_client_size_height);
        }
        pb.Paint += new PaintEventHandler(fm_paint_bg);

        void fm_paint_ball(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.FillEllipse(cts.ball_brush, (float)ball_x, (float)ball_y, cts.ball_width, cts.ball_height);
        }
        pb.Paint += new PaintEventHandler(fm_paint_ball);

        void tm_tick(object sender, EventArgs e)
        {
            if (ball_y >= cts.ball_initial_y & ball_x > cts.ball_initial_x)
            {
                tm.Stop();
            }
            else
            {
                double dx = ball_velocity_x * ((double)tm.Interval / 1000);
                double dy = ball_velocity_y * ((double)tm.Interval / 1000);
                ball_velocity_y = ball_velocity_y - cts.gravitational_accelaration * ((double)tm.Interval / 1000);

                ball_x = ball_x + dx;
                ball_y = ball_y - dy;

                if (ball_y > cts.ball_initial_y)
                {
                    ball_y = cts.ball_initial_y;
                }

                pb.Invalidate();
            }
        }
        tm.Tick += new EventHandler(tm_tick);

        void tm_click(object sender, EventArgs e)
        {
            if (tm.Enabled | ball_x > cts.ball_initial_x)
            {
                tm.Stop();
                ball_x = cts.ball_initial_x;
                ball_y = cts.ball_initial_y;
                ball_velocity_x = cts.ball_initial_velocity_x;
                ball_velocity_y = cts.ball_initial_velocity_y;
                pb.Invalidate();
            }
            else
            {
                tm.Start();
            }
        }
        pb.Click += new EventHandler(tm_click);


        // Main //
        Application.Run(fm);
    }
}


class Constants
{
    public int form_client_size_width = 1200;
    public int form_client_size_height = 700;

    public string dir_current;
    public string dir_resource = "C:\\\\Users\\\\Public\\\\mysource\\\\";
    public string img_bg_day = "background_day.png";
    public string img_bg_night = "background_night.png";
    public string dir_img_bg_day;
    public string dir_img_bg_night;

    public int timer_interval = 30;

    public int ball_width = 20;
    public int ball_height = 20;
    public SolidBrush ball_brush = new SolidBrush(Color.Gray);

    public double ball_initial_x = 10;
    public double ball_initial_y;
    public double gravitational_accelaration = 9.8 * 100;
    public double ball_initial_angle = Math.PI / 180 * 45;
    public double ball_initial_velocity = 1000;
    public double ball_initial_velocity_x;
    public double ball_initial_velocity_y;

    public Constants()
    {
        this.dir_current = System.Environment.CurrentDirectory.ToString();

        this.dir_img_bg_day = this.dir_resource + this.img_bg_day;
        this.dir_img_bg_night = this.dir_resource + this.img_bg_night;

        this.ball_initial_y = this.form_client_size_height - 30;

        this.ball_initial_velocity_x = this.ball_initial_velocity * Math.Cos(this.ball_initial_angle);
        this.ball_initial_velocity_y = this.ball_initial_velocity * Math.Sin(this.ball_initial_angle);
    }
}