I'm trying to write a movement mechanic like [this](https://i.stack.imgur.com/E6jtX.png) but how can I? If we hold to `Space` key, character in the game will move like in [here](https://i.stack.imgur.com/6uwzI.gif). If we take our hand from the key, the character will fall against to gravity. I did a research for about two hours but this site is the last solution way for me.

There is my code

```
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 c_sharp_form_test_2 {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            timer.Interval = 5;
            timer.Tick += new EventHandler(FormUpdate);
            timer.Start();
        }

        Timer timer = new Timer();

        Bitmap bitmap;
        Point center = new Point(100, 100);
        int radius = 40;
        int FigureSize = 10;

        Point end;
        float angle = -90;
        float angVel = 0;
        float angAcc = 0;

        bool isPressing = false;

        private void Form1_KeyDown(object sender, KeyEventArgs e) {
            if (e.KeyCode == Keys.Space) {
                isPressing = true;
                angle += 10;
            }
        }
        private void Form1_KeyUp(object sender, KeyEventArgs e) {
            angVel = 0;
            angAcc = 0;
            isPressing = false;
        }

        private void FormUpdate(object sender, EventArgs e) {
            end.X = (int)(radius * Math.Sin(angle / 57.2957795f)) +             center.X;// from degrees to radians
            end.Y = (int)(radius * Math.Cos(angle / 57.2957795f)) +     center.Y;// from degrees to radians

        Graphics g = Graphics.FromImage(bitmap);
        Pen bp = new Pen(Color.Black);
        SolidBrush b = new SolidBrush(Color.Black);

        g.Clear(Color.White);
        g.FillEllipse(b, end.X - FigureSize / 2, end.Y - FigureSize / 2, FigureSize, FigureSize);
        g.DrawLine(bp, center.X, center.Y, end.X, end.Y);
        pictureBox1.Image = bitmap;

        if (!isPressing) {
            angle += angVel;
            angVel += angAcc;
            angAcc = -0.15f * (float)Math.Sin(angle / 57.2957795f);
            angVel *= 0.985f;//dampening
            }
        }
    }
}

```

Thanks from now!