Create two color instances with different alpha components

Posted on February 11, 2011June 27, 2015 by coder

   
  

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());
    }
}

Five yellow squares with different alpha values(Transparensy)

Posted on February 11, 2011June 27, 2015 by coder

   
  

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
{
  [STAThread]
  static void Main() 
  {
    Application.Run(new Form1());
  }
  protected override void OnPaint(PaintEventArgs e)
  {
    Graphics g;
    g = Graphics.FromHwnd(this.Handle);

    g.FillRectangle(new SolidBrush(Color.Red), 10, 10, 210, 50);

    // 
    Rectangle r = new Rectangle(40, 20, 30, 30);
    Color c = Color.FromArgb(255, 255, 255, 0);
    g.FillRectangle(new SolidBrush(c), r);

    r.Offset(30, 0);
    c = Color.FromArgb(200, 255, 255, 0);
    g.FillRectangle(new SolidBrush(c), r);

    r.Offset(30, 0);
    c = Color.FromArgb(150, 255, 255, 0);
    g.FillRectangle(new SolidBrush(c), r);

    r.Offset(30, 0);
    c = Color.FromArgb(100, 255, 255, 0);
    g.FillRectangle(new SolidBrush(c), r);

    r.Offset(30, 0);
    c = Color.FromArgb(50, 255, 255, 0);
    g.FillRectangle(new SolidBrush(c), r);

    g.Dispose();    
  }
}

Known Colors

Posted on February 11, 2011June 27, 2015 by coder

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,
Zach Greenvoss, Shripad Kulkarni, Neil Whitlow

Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace KnownColors
{
///

/// Summary description for KnownColors.
///

public class KnownColors : System.Windows.Forms.Form
{
private System.Windows.Forms.ComboBox comboBox1;
///

/// Required designer variable.
///

private System.ComponentModel.Container components = null;

ArrayList cAL;
ArrayList cNAL;

public KnownColors()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

this.Text = “Known non-system colors”;

cAL = new ArrayList(); // colors
cNAL = new ArrayList(); // strings
NonSystemColors(cAL, cNAL);
this.comboBox1.Sorted = true;
this.comboBox1.DataSource = cNAL; //set the combo's data source

//
// TODO: Add any constructor code after InitializeComponent call
//
}

///

/// Clean up any resources being used.
///

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
///

/// Required method for Designer support – do not modify
/// the contents of this method with the code editor.
///

private void InitializeComponent()
{
this.comboBox1 = new System.Windows.Forms.ComboBox();
this.SuspendLayout();
//
// comboBox1
//
this.comboBox1.Location = new System.Drawing.Point(8, 8);
this.comboBox1.Name = “comboBox1”;
this.comboBox1.Size = new System.Drawing.Size(121, 21);
this.comboBox1.TabIndex = 0;
this.comboBox1.Text = “comboBox1”;
//
// KnownColors
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.comboBox1});
this.Name = “KnownColors”;
this.Text = “KnownColors”;
this.ResumeLayout(false);

}
#endregion

///

/// The main entry point for the application.
///

[STAThread]
static void Main()
{
Application.Run(new KnownColors());
}
private void NonSystemColors(ArrayList cAL, ArrayList cNAL)
{
Array cA = Enum.GetValues(typeof(KnownColor));
foreach(KnownColor knwnC in cA) // cX.Length = 167
{
Color curC = Color.FromKnownColor(knwnC);
if(!curC.IsSystemColor)
{
cAL.Add(curC);
cNAL.Add(curC.Name.ToString());
}
}
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics g = pea.Graphics;
int wi = 70, hi = 12, rectNb = 8;
int cALNb = cAL.Count;

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

DisplayKnownColors(g, cALNb, wi, hi, rectNb);
g.Dispose();
}
private void DisplayKnownColors(Graphics g, int cALNb, 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 < cALNb; 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)cAL[i]); g.FillRectangle(b, rec); b = new SolidBrush(Color.Black); g.DrawString((string)cNAL[i], this.Font, b, rec, strfmt); } x = (int)(cALNb % rectNb); y = (int)(cALNb / rectNb); this.comboBox1.Location = new Point(x*(wi + 2) + 2, y*(2 + hi) + 2); } } } [/csharp]

Color Changer

Posted on February 11, 2011June 27, 2015 by coder


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

namespace ColorChanger
{
    public class ColorChanger : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.Label lblSaturation;
        internal System.Windows.Forms.Label lblHue;
        internal System.Windows.Forms.Label lblBrightness;
        internal System.Windows.Forms.Label Label1;
        internal System.Windows.Forms.ListBox lstColors;

        private System.ComponentModel.Container components = null;

        public ColorChanger()
        {
            InitializeComponent();
        }

        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        private void InitializeComponent()
        {
            this.lblSaturation = new System.Windows.Forms.Label();
            this.lblHue = new System.Windows.Forms.Label();
            this.lblBrightness = new System.Windows.Forms.Label();
            this.Label1 = new System.Windows.Forms.Label();
            this.lstColors = new System.Windows.Forms.ListBox();
            this.SuspendLayout();

            this.lblSaturation.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.lblSaturation.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.lblSaturation.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblSaturation.Location = new System.Drawing.Point(264, 56);
            this.lblSaturation.Name = "lblSaturation";
            this.lblSaturation.Size = new System.Drawing.Size(136, 20);
            this.lblSaturation.TabIndex = 9;
            this.lblSaturation.Text = " Saturation";

            this.lblHue.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.lblHue.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.lblHue.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblHue.Location = new System.Drawing.Point(264, 32);
            this.lblHue.Name = "lblHue";
            this.lblHue.Size = new System.Drawing.Size(136, 20);
            this.lblHue.TabIndex = 8;
            this.lblHue.Text = " Hue";

            this.lblBrightness.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.lblBrightness.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.lblBrightness.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblBrightness.Location = new System.Drawing.Point(264, 8);
            this.lblBrightness.Name = "lblBrightness";
            this.lblBrightness.Size = new System.Drawing.Size(136, 20);
            this.lblBrightness.TabIndex = 7;
            this.lblBrightness.Text = " Brightness";

            this.Label1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.Label1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.Label1.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.Label1.Location = new System.Drawing.Point(8, 8);
            this.Label1.Name = "Label1";
            this.Label1.Size = new System.Drawing.Size(200, 20);
            this.Label1.TabIndex = 6;
            this.Label1.Text = " Choose a Background Color:";

            this.lstColors.Location = new System.Drawing.Point(8, 36);
            this.lstColors.Name = "lstColors";
            this.lstColors.Size = new System.Drawing.Size(200, 238);
            this.lstColors.TabIndex = 5;
            this.lstColors.SelectedIndexChanged += new System.EventHandler(this.lstColors_SelectedIndexChanged);

            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(472, 290);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.lblSaturation,
                                                                          this.lblHue,
                                                                          this.lblBrightness,
                                                                          this.Label1,
                                                                          this.lstColors});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "ColorChanger";
            this.Text = "Color Changer";
            this.Load += new System.EventHandler(this.ColorChanger_Load);
            this.ResumeLayout(false);

        }
        #endregion
        [STAThread]
        static void Main() 
        {
            Application.Run(new ColorChanger());
        }

        private void ColorChanger_Load(object sender, System.EventArgs e)
        {
            string[] colorNames;
            colorNames = System.Enum.GetNames(typeof(KnownColor));

            lstColors.Items.AddRange(colorNames);
        }

        private void lstColors_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            KnownColor selectedColor;
            selectedColor = (KnownColor)System.Enum.Parse(typeof(KnownColor), lstColors.Text);
            
            this.BackColor = System.Drawing.Color.FromKnownColor(selectedColor);
            
            lblBrightness.Text = "Brightness = " +this.BackColor.GetBrightness().ToString();
            lblHue.Text = "Hue = " + this.BackColor.GetHue().ToString();
            lblSaturation.Text = "Saturation = " + this.BackColor.GetSaturation().ToString();
        }
    }
}

All the colors that are supported in C# according

Posted on February 11, 2011June 27, 2015 by coder

   
 

//ColorGuide.cs

/*
   This Program will generate all the colors that are supported in C# according 
   to the Name....
   I expected from you a better version of this program
     If you can , then inform me how you made it
   e.g. you make a dll file where the whole color array is stored then 
   your coding lines will  decrease. I tried that way but the trial was 
   in vane....
*/
using System;
using System.Windows.Forms;
using System.Drawing;
public class CreateMyPanel : Form
{  
  Color[] color = new Color[]{
                   Color.AliceBlue,    Color.AntiqueWhite,   Color.Aqua,   Color.Aquamarine,
                   Color.Azure,        Color.Beige,          Color.Bisque, Color.Black,
                   Color.BlanchedAlmond,Color.Blue,          Color.BlueViolet,Color.Brown,
                   Color.BurlyWood,    Color.CadetBlue,      Color.Chartreuse,Color.Chocolate,
                   Color.Coral,        Color.Cornsilk,Color.Crimson,
                   Color.Cyan,         Color.DarkBlue,       Color.DarkCyan,Color.DarkGoldenrod,
                   Color.DarkGray,     Color.DarkGreen,      Color.DarkKhaki,Color.DarkMagenta,
                   Color.DarkOliveGreen,Color.DarkOrange,Color.DarkOrchid,Color.DarkRed,
                   Color.DarkSalmon,Color.DarkSeaGreen,Color.DarkSlateBlue,Color.DarkSlateGray,
                   Color.DarkTurquoise,Color.DarkViolet,Color.DeepPink,Color.DeepSkyBlue,
                   Color.DimGray,Color.DodgerBlue,Color.Firebrick,Color.FloralWhite,
                   Color.ForestGreen,Color.Fuchsia,Color.Gainsboro,Color.GhostWhite,
                   Color.Gold,Color.Goldenrod,Color.Gray,Color.Green,Color.GreenYellow,
                   Color.Honeydew,Color.HotPink,Color.IndianRed,Color.Indigo,
                   Color.Ivory,Color.Khaki,Color.Lavender,Color.LavenderBlush,
                   Color.LawnGreen,Color.LemonChiffon,Color.LightBlue,Color.LightCoral,
                   Color.LightCyan,Color.LightGoldenrodYellow,Color.LightGray,
                   Color.LightGreen,Color.LightPink,Color.LightSalmon,Color.LightSeaGreen,
                   Color.LightSkyBlue,Color.LightSlateGray,Color.LightSteelBlue,
                   Color.LightYellow,Color.Lime,Color.LimeGreen,Color.Linen,
                   Color.Magenta,Color.Maroon,Color.MediumAquamarine,Color.MediumBlue,
                   Color.MediumOrchid,Color.MediumPurple,Color.MediumSeaGreen,
                   Color.MediumSlateBlue,Color.MediumSpringGreen,Color.MediumTurquoise,
                   Color.MediumVioletRed,Color.MidnightBlue,Color.MintCream,Color.MistyRose,
                   Color.Moccasin,Color.NavajoWhite,Color.Navy,Color.OldLace,
                   Color.Olive,Color.OliveDrab,Color.Orange,Color.OrangeRed,
                   Color.Orchid,Color.PaleGoldenrod,Color.PaleGreen,Color.PaleTurquoise,
                   Color.PaleVioletRed,Color.PapayaWhip,Color.PeachPuff,Color.Peru,
                   Color.Pink,Color.Plum,Color.PowderBlue,Color.Purple,Color.Red,
                   Color.RosyBrown,Color.RoyalBlue,Color.SaddleBrown,Color.Salmon,
                   Color.SandyBrown,Color.SeaGreen,Color.SeaShell,Color.Sienna,Color.Silver,
                   Color.SkyBlue,Color.SlateBlue,Color.SlateGray,Color.Snow,
                   Color.SpringGreen,Color.SteelBlue,Color.Tan,Color.Teal,
                   Color.Thistle,Color.Tomato,Color.Transparent,Color.Turquoise,
                   Color.Violet,Color.Wheat,Color.White,Color.WhiteSmoke,Color.Yellow,
                   Color.YellowGreen
                 };
  private Panel panel1 = new Panel(); 
  private Label[] col = new Label[140];

  public CreateMyPanel() 
  {     
    // Initialize the Panel control.
    panel1.Location = new Point(ClientRectangle.Left + 5,ClientRectangle.Top + 5);
    panel1.Size = new Size(ClientRectangle.Right-5, ClientRectangle.Bottom-5);  
    panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
    this.Controls.Add(panel1); // Add the Panel control to (inside) the form.  
    // Initalize the Label controls.  
    int ystart = ClientRectangle.Top;
    for(int j=0; j<140; j++)
      col&#91;j&#93; = new Label();
    for(int i = 0; i<140; i++)
    {
      col&#91;i&#93;.Size = new Size(ClientRectangle.Right, 20);  
      col&#91;i&#93;.Font = new System.Drawing.Font("Comic Sans MS",10,FontStyle.Bold);  
      col&#91;i&#93;.ForeColor = Color.Black;
      if(col&#91;i&#93;.Equals(Color.Black) == true)
      {
          col&#91;i&#93;.ForeColor = Color.White;
      }
      col&#91;i&#93;.Text = color&#91;i&#93;.ToString();
      col&#91;i&#93;.Location = new Point(ClientRectangle.Left,ystart);
      col&#91;i&#93;.BackColor = color&#91;i&#93;;
      col&#91;i&#93;.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;  
      panel1.Controls.Add(col&#91;i&#93;);  // Add the Label controls to (inside) the Panel.
      if((col&#91;i&#93;.Location.Y > panel1.Location.Y))
      {
        panel1.AutoScroll = true;   
      }  
      ystart += 20;
    }
    this.Size = new Size(315, 300);
    this.Text = "A Color Guide - JAYANT";
    this.MaximizeBox = false;
//    this.BorderStyle = FormBorderStyle.FixedDialog;
    this.StartPosition = FormStartPosition.CenterScreen;
  }

  public static void Main() 
  {
    Application.Run(new CreateMyPanel());
  }
}  

/* To Compile :----
csc /r:System.dll /r:System.Drawing.dll /r:System.Windows.Forms.dll /r:Microssft.Win32.InterOp.dll /out:ColorGuide.exe Colorguide.cs
*/

Filled with the semi transparent and transparent color

Posted on February 11, 2011June 27, 2015 by coder


   
 

  using System;
  using System.Drawing;
  using System.Drawing.Drawing2D;
  using System.Collections;
  using System.ComponentModel;
  using System.Windows.Forms;
  using System.Data;

  public class Form1 : System.Windows.Forms.Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void InitializeComponent()
    {
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(292, 273);
      this.Text = "";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

    }
    static void Main() 
    {
      Application.Run(new Form1());
    }

    private void Form1_Paint(object sender, System.Windows.Forms.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);
    }

    private void Form1_Resize(object sender, System.EventArgs e)
    {
      Invalidate();
    }
  }

Draw each of 100 cells with randomly chosen colors

Posted on February 11, 2011June 27, 2015 by coder

using System;
using System.Drawing;
using System.Windows.Forms;

public class ColorChips : Form {
public ColorChips() {
Size = new Size(300,300);
Text = “Color Chips”;
}

protected override void OnPaint(PaintEventArgs e) {
Graphics g = e.Graphics;
int h = DisplayRectangle.Height;
int w = DisplayRectangle.Width;
Random r = new Random();

for (int i = 0; i < 10; i++){ for (int j = 0; j < 10; j++) { Color color = Color.FromArgb (r.Next(256), r.Next(256), r.Next(256)); Brush brush = new SolidBrush(color); g.FillRectangle(brush, i*w/10, j*h/10, w/10, h/10); } } base.OnPaint(e); } static void Main() { Application.Run(new ColorChips()); } } [/csharp]

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