private void Form1_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Lab3_Point point = new Lab3_Point(e.X, e.Y);
this.clickCoordinates.Add(point);
this.Invalidate();
}
else if (e.Button == MouseButtons.Right)
{
const int WIDTH = 20;
const int HEIGHT = 20;
foreach (Lab3_Point point in this.clickCoordinates)
{
if (point.coordinates.X + WIDTH / 2 > e.X && point.coordinates.X - WIDTH / 2 < e.X &&
point.coordinates.Y + HEIGHT / 2 > e.Y && point.coordinates.Y - HEIGHT / 2 < e.Y)
{
if (point.isRed)
{
this.clickCoordinates.Remove(point);
}
else
{
point.isRed = true;
}
break;
}
}
this.Invalidate();
}
}
protected override void OnPaint(PaintEventArgs e)
{
const int WIDTH = 20;
const int HEIGHT = 20;
if (this.clickCoordinates.Count != 0)
{
Lab3_Point prevPoint = (Lab3_Point)this.clickCoordinates[0];
foreach (Lab3_Point point in this.clickCoordinates)
{
if (point.isRed)
{
e.Graphics.FillEllipse(Brushes.Red, point.coordinates.X - WIDTH / 2, point.coordinates.Y - WIDTH / 2, WIDTH, HEIGHT);
}
else
{
e.Graphics.FillEllipse(Brushes.Black, point.coordinates.X - WIDTH / 2, point.coordinates.Y - WIDTH / 2, WIDTH, HEIGHT);
}
e.Graphics.DrawLine(Pens.Black, point.coordinates, prevPoint.coordinates);
prevPoint = point;
}
}
}
