How to trace a written text is correct or not

Question

This is the code for writing letter ka

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 WindowsFormsApplication56
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Drawcarc(object sender, PaintEventArgs e)
{
// Create pen.
Pen blackPen = new Pen(Color.Black, 3);
// Create coordinates of rectangle to bound ellipse.
float x1 = 460.0F;
float x2 = 510.0F;
float y = 190.0F;
float width = 40.0F;
float height = 75.0F;
// Create start and sweep angles on ellipse.
float startAngle1 = 35.0F;
float startAngle2 = 200.0F;
float sweepAngle1 = 300.0F;
float sweepAngle2 = 300.0F;
float[] dashValues = { 2, 2, 2, 2 };
blackPen.DashPattern = dashValues;
e.Graphics.DrawLine(blackPen, new Point(430, 150), new Point(590, 150));
e.Graphics.DrawLine(blackPen, new Point(505, 160), new Point(505, 290));
// Draw arc to screen.
e.Graphics.DrawArc(blackPen, x1, y, width, height, startAngle1 , sweepAngle1);
e.Graphics.DrawArc(blackPen, x2, y, width, height, startAngle2, sweepAngle2);
}
}
}
THIS IS THE CODE FOR DRAWING
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 WindowsFormsApplication58
{
public partial class Form1 : Form
{
Graphics g;
int x = -1;
int y = -1;
bool moving = false;
Pen pen;
public Form1()
{
InitializeComponent();
g = panel1.CreateGraphics();
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
pen = new Pen(Color.Black, 5);
pen.StartCap = pen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
}
private void pictureBox1_Click(object sender, EventArgs e)
{
PictureBox p = (PictureBox)sender;
pen.Color = p.BackColor;
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
moving = true;
x = e.X;
y = e.Y;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (moving && x != -1 && y != -1)
{
g.DrawLine(pen, new Point(x, y), e.Location);
x = e.X;
y = e.Y;
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
moving = false;
x = -1;
y = -1;
}
}
}

Now I want if I draw a line over text ka then it should show it is correct otherwise if the line is drawn outside text ka then should show it is not correct