using System;
using System.Drawing;
using System.Windows.Forms;
class ColorTrackBar: Form
{
Panel panel;
Label[] alabelName = new Label[3];
Label[] alabelValue = new Label[3];
TrackBar[] atrackbar = new TrackBar[3];
public static void Main()
{
Application.Run(new ColorTrackBar());
}
public ColorTrackBar()
{
Color[] acolor = { Color.Red, Color.Green, Color.Blue };
panel = new Panel();
panel.Parent = this;
panel.Location = new Point(0, 0);
panel.BackColor = Color.White;
for (int i = 0; i < 3; i++)
{
alabelName[i] = new Label();
alabelName[i].Parent = panel;
alabelName[i].ForeColor = acolor[i];
alabelName[i].Text = "&" + acolor[i].ToKnownColor();
alabelName[i].TextAlign = ContentAlignment.MiddleCenter;
atrackbar[i] = new TrackBar();
atrackbar[i].Parent = panel;
atrackbar[i].Orientation = Orientation.Vertical;
atrackbar[i].BackColor = acolor[i];
atrackbar[i].SmallChange = 1;
atrackbar[i].LargeChange = 16;
atrackbar[i].Minimum = 0;
atrackbar[i].Maximum = 255;
atrackbar[i].TickFrequency = 16;
atrackbar[i].ValueChanged += new EventHandler(TrackBarOnValueChanged);
alabelValue[i] = new Label();
alabelValue[i].Parent = panel;
alabelValue[i].TextAlign = ContentAlignment.MiddleCenter;
}
Color color = BackColor;
atrackbar[0].Value = color.R; // Generates ValueChanged event
atrackbar[1].Value = color.G;
atrackbar[2].Value = color.B;
OnResize(EventArgs.Empty);
}
protected override void OnResize(EventArgs ea)
{
base.OnResize(ea);
int cx = ClientSize.Width;
int cy = ClientSize.Height;
int cyFont = Font.Height;
panel.Size = new Size(cx / 2, cy);
for (int i = 0; i < 3; i++)
{
alabelName[i].Location = new Point(i * cx / 6, cyFont / 2);
alabelName[i].Size = new Size(cx / 6, cyFont);
atrackbar[i].Height = cy - 4 * cyFont;
atrackbar[i].Location =
new Point((1 + 2 * i) * cx / 12 - atrackbar[i].Width / 2,
2 * cyFont);
alabelValue[i].Location = new Point(i * cx / 6,
cy - 3 * cyFont / 2);
alabelValue[i].Size = new Size(cx / 6, cyFont);
}
}
void TrackBarOnValueChanged(object obj, EventArgs ea)
{
for (int i = 0; i < 3; i++)
if((TrackBar) obj == atrackbar[i])
alabelValue[i].Text = atrackbar[i].Value.ToString();
BackColor = Color.FromArgb(atrackbar[0].Value,
atrackbar[1].Value,
atrackbar[2].Value);
}
}
