/// <summary>
/// Takes the weights and the bias.
/// Calculates the decision boundary for the perceptron.
/// </summary>
/// <returns></returns>
private void getFunction()
{
float xIntercept = -weights[0] / weights[2];
float yIntercept = -weights[0] / weights[1];
float m = yIntercept / xIntercept;
this.Solution = new Straightline(m, xIntercept);
}
/// <summary>
/// Creates the line which divides the points.
/// TODO call the training method.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
try
{
//solves the point list to a 95% accuracy
Solution = S.FindSolutionFor(modelGenerator.points, Debug);
if (Debug)
{
Console.WriteLine(Solution.ToString());
}
RedrawModel(modelGenerator.points, Solution, -1, -1, Color.Black);
}
catch (NoSolutionException noSolutionException)
{
MessageBox.Show(noSolutionException.Message);
}
}
private void RedrawModel(List <ModelPoint> model, Straightline decisionBoundary, int newPointX, int newPointy, Color newPointColor)
{
//draws the dataset on the canvas
g = this.CreateGraphics();
g.Clear(Color.White);
Pen p = new Pen(Color.Black);
Pen blueP = new Pen(Color.Blue);
Pen redP = new Pen(Color.Red);
//draws the coordinate system
g.DrawLine(p, 25, 700, 25, 0);
g.DrawLine(p, 25, 700, 725, 700);
//draws the points
List <ModelPoint> pointList = modelGenerator.points;
if (pointList.Count > 0)
{
for (int i = 0; i < pointList.Count; ++i)
{
if (pointList[i].Color == Color.Blue)
{
g.DrawEllipse(blueP, 25 + (pointList[i].X * 7), 700 - (pointList[i].Y * 7), 7, 7);
}
else
{
g.DrawEllipse(redP, 25 + (pointList[i].X * 7), 700 - (pointList[i].Y * 7), 7, 7);
}
}
}
//paints the straight line on the canvas
if (decisionBoundary != null)
{
float[] line = new float[4];
for (int i = 0; i <= 100; ++i)
{
float yZero = decisionBoundary.F(i);
if (yZero >= 0 && yZero <= 1)
{
line[0] = i;
line[1] = yZero;
for (int j = 0; j <= 100; ++j)
{
float yHundred = decisionBoundary.F(j);
if (yHundred >= 100 && yHundred <= 101)
{
line[2] = j;
line[3] = yHundred;
break;
}
}
break;
}
}
Pen pen = new Pen(Color.Blue);
Point a = new Point((int)((line[0] * 7) + 25), (int)((line[1] * 7) + 25)); //point for 0 <= f(x) <= 1
Point b = new Point((int)((line[2] * 7) + 25), (int)((line[3] * 7) + 25)); //point for 100 <= f(x) <= 101
if (Debug)
{
Console.WriteLine("Translated Points:\t" + a.ToString() + "\t" + b.ToString());
}
g.DrawLine(pen, a, b);
}
if (newPointX >= 0 && newPointy >= 0)
{
SolidBrush brush = new SolidBrush(newPointColor);
g.FillEllipse(brush, 25 + (newPointX * 7), 700 - (newPointy * 7), 7, 7);
brush.Dispose();
}
}
