using System;
using System.Drawing;
using System.Windows.Forms;
class ColorFillDialogBox: Form
{
GroupBox grpbox = new GroupBox();
CheckBox chkbox = new CheckBox();
public ColorFillDialogBox()
{
string[] astrColor = { “Black”, “Blue”, “Green”, “Cyan”,
“Red”, “Magenta”, “Yellow”, “White”};
grpbox.Parent = this;
grpbox.Text = “Color”;
grpbox.Location = new Point(8, 8);
grpbox.Size = new Size(96, 12 * (astrColor.Length + 1));
for (int i = 0; i < astrColor.Length; i++) { RadioButton radiobtn = new RadioButton(); radiobtn.Parent = grpbox; radiobtn.Text = astrColor[i]; radiobtn.Location = new Point(8, 12 * (i + 1)); radiobtn.Size = new Size(80, 10); } chkbox.Parent = this; chkbox.Text = "Fill Ellipse"; chkbox.Location = new Point(8, grpbox.Bottom + 4); chkbox.Size = new Size(80, 10); Button btn = new Button(); btn.Parent = this; btn.Text = "OK"; btn.Location = new Point(8, chkbox.Bottom + 4); btn.Size = new Size(40, 16); btn.DialogResult = DialogResult.OK; AcceptButton = btn; btn = new Button(); btn.Parent = this; btn.Text = "Cancel"; btn.Location = new Point(64, chkbox.Bottom + 4); btn.Size = new Size(40, 16); btn.DialogResult = DialogResult.Cancel; CancelButton = btn; ClientSize = new Size(112, btn.Bottom + 8); AutoScaleBaseSize = new Size(4, 8); } public Color Color { get { for (int i = 0; i < grpbox.Controls.Count; i++) { RadioButton radiobtn = (RadioButton) grpbox.Controls[i]; if (radiobtn.Checked) return Color.FromName(radiobtn.Text); } return Color.Black; } set { for (int i = 0; i < grpbox.Controls.Count; i++) { RadioButton radiobtn = (RadioButton) grpbox.Controls[i]; if (value == Color.FromName(radiobtn.Text)) { radiobtn.Checked = true; break; } } } } public bool Fill { get { return chkbox.Checked; } set { chkbox.Checked = value; } } } class DrawOrFillEllipse: Form { Color colorEllipse = Color.Red; bool bFillEllipse = false; public static void Main() { Application.Run(new DrawOrFillEllipse()); } public DrawOrFillEllipse() { ResizeRedraw = true; Menu = new MainMenu(); Menu.MenuItems.Add("&Options"); Menu.MenuItems[0].MenuItems.Add("&Color...", new EventHandler(MenuColorOnClick)); } void MenuColorOnClick(object obj, EventArgs ea) { ColorFillDialogBox dlg = new ColorFillDialogBox(); dlg.Color = colorEllipse; dlg.Fill = bFillEllipse; if (dlg.ShowDialog() == DialogResult.OK) { colorEllipse = dlg.Color; bFillEllipse = dlg.Fill; Invalidate(); } } protected override void OnPaint(PaintEventArgs pea) { Graphics grfx = pea.Graphics; Rectangle rect = new Rectangle(0, 0, 50, 50); if(bFillEllipse) grfx.FillEllipse(new SolidBrush(colorEllipse), rect); else grfx.DrawEllipse(new Pen(colorEllipse), rect); } } [/csharp]