private void chart1_MouseClick(object sender, MouseEventArgs e)
{
var pos = e.Location;
clickPosition = pos;
var results = chart1.HitTest(pos.X, pos.Y, false, ChartElementType.PlottingArea);
foreach (var result in results)
{
if (result.ChartElementType == ChartElementType.PlottingArea)
{
double xVal = Math.Round(result.ChartArea.AxisX.PixelPositionToValue(pos.X), 1);
double yVal = Math.Round(result.ChartArea.AxisY.PixelPositionToValue(pos.Y), 1);
if (addNewData.Checked)
{
this.dataTable.Rows.Add(xVal, yVal, categorySelector.Text);
refreshChart(sender, e);
}
else
{
int k = Convert.ToInt16(kField.Text);
bool weighted = weightedBox.Checked;
DataTable dt = new DataTable();
dt = (DataTable)this.dataGridView1.DataSource;
string categoryGuess = KNN_calculator.guess(dt, xVal, yVal, k, weighted);
// Add to chart.
chart1.Series["Original Data"].Points.AddXY(xVal, yVal);
int point_count = chart1.Series["Original Data"].Points.Count - 1;
chart1.Series["Original Data"].Points[point_count].MarkerStyle = MarkerStyle.Square;
chart1.Series["Original Data"].Points[point_count].MarkerSize = 10;
if (categoryGuess.Length > 1)
{
chart1.Series["Original Data"].Points[point_count].Color = Color.Gray;
}
else
{
chart1.Series["Original Data"].Points[point_count].Color = catColor(categoryGuess);
};
chart1.Invalidate();
}
}
}
}
private void drawZoneButton_Click(object sender, EventArgs e)
{
// Work out data boundaries.
// (x1,y1) is bottom LH corner.
// (x2,y2) is top RH corner.
double x, y, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
for (int rows = 0; rows < dataGridView1.Rows.Count - 1; rows++)
{
var xcell = dataGridView1.Rows[rows].Cells[0].Value;
var ycell = dataGridView1.Rows[rows].Cells[1].Value;
var catcell = dataGridView1.Rows[rows].Cells[2].Value;
if (xcell != DBNull.Value && ycell != DBNull.Value && catcell != DBNull.Value)
{
// Read next data pair.
x = Convert.ToDouble(xcell);
y = Convert.ToDouble(ycell);
// Update boundaries.
if (rows == 0)
{
x1 = x; y1 = y; x2 = x; y2 = y;
}
else
{
x1 = Math.Min(x1, x); y1 = Math.Min(y1, y); x2 = Math.Max(x2, x); y2 = Math.Max(y2, y);
}
}
}
// Guess category at each point in zone.
int k = Convert.ToInt16(kField.Text);
bool weighted = weightedBox.Checked;
double interval = Convert.ToDouble(intervalBox.Text);
int marker_size = Convert.ToInt16(markerSizeBox.Text);
DataTable dt = new DataTable();
dt = (DataTable)this.dataGridView1.DataSource;
for (double xVal = x1; xVal <= x2; xVal += interval)
{
for (double yVal = y1; yVal <= y2; yVal += interval)
{
// Guess category.
string categoryGuess = KNN_calculator.guess(dt, xVal, yVal, k, weighted);
// Add to chart.
chart1.Series["Original Data"].Points.AddXY(xVal, yVal);
int point_count = chart1.Series["Original Data"].Points.Count - 1;
chart1.Series["Original Data"].Points[point_count].MarkerStyle = MarkerStyle.Square;
chart1.Series["Original Data"].Points[point_count].MarkerSize = marker_size;
if (categoryGuess.Length > 1)
{
chart1.Series["Original Data"].Points[point_count].Color = Color.Gray;
}
else
{
chart1.Series["Original Data"].Points[point_count].Color = catColor(categoryGuess);
};
}
}
chart1.Invalidate();
}
