private void PictureBox1_Click(object sender, EventArgs e) { if (grainTypeCombo.SelectedItem == null) { MessageBox.Show("Wybierz typ ziarna przed klikaniem na siatkę!"); return; } int grainType = System.Convert.ToInt32(grainTypeCombo.SelectedItem); MouseEventArgs clicked = (MouseEventArgs)e; Point clickCoordinates = clicked.Location; simulation.AddSeedOfSpecifiedType(clickCoordinates.Y / cellSize, clickCoordinates.X / cellSize, grainType); }