// crudwork
// Copyright 2004 by Steve T. Pham (http://www.crudwork.com)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with This program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace crudwork.Utilities
{
  /// <summary>
  /// Color Utility
  /// </summary>
  public static class ColorUtil
  {
    private static Random random = new Random();
    private static int r;
    private static int g;
    private static int b;

    /// <summary>
    /// Return a randomly-generated color
    /// </summary>
    /// <returns></returns>
    public static Color GetRandomColor()
    {
      r = random.Next(0, 256);
      g = random.Next(0, 256);
      b = random.Next(0, 256);
      return Color.FromArgb(r, g, b);
    }
  }
}

   
     

//GNU General Public License version 2 (GPLv2)
//http://dotwayutilities.codeplex.com/license

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Dotway.WPF.Controls.Utilities
{
///

public struct HSV
{
public HSV(double hue, double saturation, double value)
{
h = 0.0;
s = 0.0;
v = 0.0;

H = hue;
S = saturation;
V = value;
}

private double h;
public double H
{
get { return h; }
set
{
if (value >= 0 && value <= 360) { h = value; } else { throw new ArgumentOutOfRangeException("H is not in the span [0, 360]."); } } } private double s; public double S { get { return s; } set { if (value >= 0.0 && value <= 1.0) { s = value; } else { throw new ArgumentOutOfRangeException("S is not in the span [0, 1]."); } } } private double v; public double V { get { return v; } set { if (value >= 0.0 && value <= 1.0) { v = value; } else { throw new ArgumentOutOfRangeException("V is not in the span [0, 1]."); } } } } } [/csharp]

//GNU General Public License version 2 (GPLv2)
//http://dotwayutilities.codeplex.com/license

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;
using System.ComponentModel;

namespace Dotway.WPF.Controls.Utilities
{
///

public struct RGB
{
public RGB(Color color)
{
r = 0.0;
g = 0.0;
b = 0.0;

R = color.R / 255.0;
G = color.G / 255.0;
B = color.B / 255.0;
}

///

/// /// /// public RGB(byte red, byte green, byte blue)
{
r = 0.0;
g = 0.0;
b = 0.0;

R = red / 255.0;
G = green / 255.0;
B = blue / 255.0;
}

///

/// /// /// public RGB(double red, double green, double blue)
{
r = 0.0;
g = 0.0;
b = 0.0;

R = red;
G = green;
B = blue;
}

private double r;
public double R
{
get { return r; }
set
{
if (value >= 0.0 && value <= 1.0) { r = value; } else { throw new ArgumentOutOfRangeException("R is not in the span [0, 1]"); } } } private double g; public double G { get { return g; } set { if (value >= 0.0 && value <= 1.0) { g = value; } else { throw new ArgumentOutOfRangeException("G is not in the span [0, 1]"); } } } private double b; public double B { get { return b; } set { if (value >= 0.0 && value <= 1.0) { b = value; } else { throw new ArgumentOutOfRangeException("B is not in the span [0, 1]"); } } } } } [/csharp]

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class Form1 : System.Windows.Forms.Form {
ArrayList knownColorList = new ArrayList();
ArrayList knownColorNameList = new ArrayList();

public Form1() {
NonSystemColors(knownColorList, knownColorNameList);

}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
private void NonSystemColors(ArrayList knownColorList, ArrayList knownColorNameList) {
Array cA = Enum.GetValues(typeof(KnownColor));
foreach (KnownColor knwnC in cA) {
Color curC = Color.FromKnownColor(knwnC);
if (!curC.IsSystemColor) {
knownColorList.Add(curC);
knownColorNameList.Add(curC.Name.ToString());
}
}
}
protected override void OnPaint(PaintEventArgs pea) {
Graphics g = pea.Graphics;
int wi = 70, hi = 12, rectNb = 8;
int count = knownColorList.Count;

this.Width = (wi + 2) * rectNb + 9;
int y = (int)(count / rectNb);
this.Height = y * (2 + hi) + 60;

DisplayKnownColors(g, count, wi, hi, rectNb);
g.Dispose();
}
private void DisplayKnownColors(Graphics g, int count, int wi, int hi, int rectNb) {
Rectangle rec;
Pen p = new Pen(this.ForeColor);
Brush b;

StringFormat strfmt = new StringFormat();
strfmt.LineAlignment = strfmt.Alignment = StringAlignment.Near;

int x, y;
for (int i = 0; i < count; i++) { x = (int)(i % rectNb); y = (int)(i / rectNb); rec = new Rectangle(1 + x * (2 + wi), 1 + y * (2 + hi), wi, hi); g.DrawRectangle(p, rec); b = new SolidBrush((Color)knownColorList[i]); g.FillRectangle(b, rec); b = new SolidBrush(Color.Black); g.DrawString((string)knownColorNameList[i], this.Font, b, rec, strfmt); } } } [/csharp]

   
  


using System;
using System.Drawing;
using System.Windows.Forms;
   
class RandomClear: Form 
{
     public static void Main()
     {
          Application.Run(new RandomClear());
     }
     public RandomClear()      
     {
          Text = "Random Clear";
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics graphics = pea.Graphics;
          Random   rand = new Random();
   
          graphics.Clear(Color.FromArgb(rand.Next(256),
                                    rand.Next(256),
                                    rand.Next(256)));
     }
}

   
     

   
  

using System;
using System.Drawing;
using System.Windows.Forms;
   
class PaintEvent
{
     public static void Main()
     {
          Form form   = new Form();
          form.Text   = "Paint Event";
          form.Paint += new PaintEventHandler(MyPaintHandler);
   
          Application.Run(form);
     }
     static void MyPaintHandler(object objSender, PaintEventArgs pea)
     {
          Graphics graphics = pea.Graphics;
   
          graphics.Clear(Color.Chocolate);
     }
}

   
     

   
  

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {

    protected override void OnPaint(PaintEventArgs e) {
        Graphics g = e.Graphics;
        g.FillRectangle(Brushes.White, this.ClientRectangle);

        Color c1 = Color.FromArgb(100, Color.Blue);
        Color c2 = Color.FromArgb(50, Color.Green);

        g.FillEllipse(Brushes.Red, 20, 20, 80, 80);
        g.FillRectangle(new SolidBrush(c1), 60, 80, 60, 60);
        Point[] pa = new Point[] {
                        new Point(150, 40), 
                        new Point(90, 40), 
                        new Point(90, 120)};
        g.FillPolygon(new SolidBrush(c2), pa);
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}