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/*
* Created using SharpDevelop free C# IDE from
* http://www.icsharpcode.net/opensource/sd/
* User: vegaseat
*
* Draw a bunch of random circles or lines on a windows form
* A very merry Windows Application
*/

using System;
using System.Drawing; // GDI+ stuff
using System.Drawing.Imaging; // ImageFormat
using System.Windows.Forms;

namespace DrawLineCircle
{
// Summary description for Form1
// a window with five buttons
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button btnLine;
private System.Windows.Forms.Button btnCircle;
private System.Windows.Forms.Button btnFill;
private System.Windows.Forms.Button btnSave;
private System.Windows.Forms.Button btnClear;

private Bitmap DrawArea; // make a persistent drawing area

// Required designer variable
private System.ComponentModel.Container components = null;

private Random rnd;
private Pen myPen;

public Form1()
{
InitializeComponent();
rnd = new Random((int)DateTime.Now.Ticks); // seeded with ticks
myPen = new Pen(Color.Red);
}

// 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
private void InitializeComponent()
{
this.btnCircle = new System.Windows.Forms.Button();
this.btnSave = new System.Windows.Forms.Button();
this.btnLine = new System.Windows.Forms.Button();
this.btnFill = new System.Windows.Forms.Button();
this.btnClear = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// btnCircle
//
this.btnCircle.Location = new System.Drawing.Point(136, 296);
this.btnCircle.Name = "btnCircle";
this.btnCircle.Size = new System.Drawing.Size(56, 20);
this.btnCircle.TabIndex = 0;
this.btnCircle.Text = "Circle";
this.btnCircle.Click += new System.EventHandler(this.btnCircle_Click);
//
// btnSave
//
this.btnSave.Location = new System.Drawing.Point(328, 296);
this.btnSave.Name = "btnSave";
this.btnSave.Size = new System.Drawing.Size(48, 20);
this.btnSave.TabIndex = 0;
this.btnSave.Text = "Save";
this.btnSave.Click += new System.EventHandler(this.btnSave_Click);
//
// btnLine
//
this.btnLine.Location = new System.Drawing.Point(264, 296);
this.btnLine.Name = "btnLine";
this.btnLine.Size = new System.Drawing.Size(54, 20);
this.btnLine.TabIndex = 1;
this.btnLine.Text = "Line";
this.btnLine.Click += new System.EventHandler(this.btnLine_Click);
//
// btnFill
//
this.btnFill.Location = new System.Drawing.Point(200, 296);
this.btnFill.Name = "btnFill";
this.btnFill.Size = new System.Drawing.Size(56, 20);
this.btnFill.TabIndex = 2;
this.btnFill.Text = "FCircle";
this.btnFill.Click += new System.EventHandler(this.btnFill_Click);
//
// btnClear
//
this.btnClear.Location = new System.Drawing.Point(8, 296);
this.btnClear.Name = "btnClear";
this.btnClear.Size = new System.Drawing.Size(56, 20);
this.btnClear.TabIndex = 3;
this.btnClear.Text = "Clear";
this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
this.ClientSize = new System.Drawing.Size(380, 325);
this.Controls.Add(this.btnClear);
this.Controls.Add(this.btnFill);
this.Controls.Add(this.btnSave);
this.Controls.Add(this.btnLine);
this.Controls.Add(this.btnCircle);
this.Name = "Form1";
this.Text = "Draw a few circles ...";
this.Load += new System.EventHandler(this.Form1_Load);
this.Closed += new System.EventHandler(this.Form1_Closed);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.ResumeLayout(false);

}
#endregion

//
// This is the main entry point for the application.
//
public static void Main()
{
Application.Run(new Form1());
}

// Line button click event
private void btnLine_Click(object sender, System.EventArgs e)
{
Graphics xGraph;
int k;

xGraph = Graphics.FromImage(DrawArea);

for(k = 1; k < 40; k++)
{
myPen.Color = Color.FromArgb(
(rnd.Next(0,255)),
(rnd.Next(0,255)),
(rnd.Next(0,255)));

xGraph.DrawLine(
myPen,
(int) rnd.Next(0, this.Width),
(int) rnd.Next(0, this.Height),
(int) rnd.Next(0, this.Width),
(int) rnd.Next(0, this.Height));
}
xGraph.Dispose();
this.Invalidate();
}

// Circle button click event
private void btnCircle_Click(object sender, System.EventArgs e)
{
Graphics xGraph;
int k;
int r; // radius of circle
int x, y; // center coordinates of circle

xGraph = Graphics.FromImage(DrawArea);

for(k = 1; k < 40; k++)
{
// radius for circle, max 1/2 the width of the form
r = rnd.Next(0, (this.Width / 2));
x = rnd.Next(0, this.Width);
y = rnd.Next(0, this.Height);

myPen.Color = Color.FromArgb(
(rnd.Next(0,255)),
(rnd.Next(0,255)),
(rnd.Next(0,255)));
// convert centerX, centerY, radius to bounding rectangle
xGraph.DrawEllipse( myPen, x-r, y-r, r, r );
}
xGraph.Dispose();
this.Invalidate();
}

// FCircle (solid circle) button click event
private void btnFill_Click(object sender, System.EventArgs e)
{
Graphics xGraph;
int k;
int r; // radius of circle
int x, y; // center coordinates of circle

xGraph = Graphics.FromImage(DrawArea);

// Create solid brush.
SolidBrush Brush = new SolidBrush(Color.Red);
for(k = 1; k < 40; k++)
{
// radius for circle, max 1/2 the width of the form
r = rnd.Next(0, (this.Width / 2));
x = rnd.Next(0, this.Width);
y = rnd.Next(0, this.Height);

Brush.Color = Color.FromArgb(
(rnd.Next(0,255)),
(rnd.Next(0,255)),
(rnd.Next(0,255)));
// convert centerX, centerY, radius to bounding rectangle
xGraph.FillEllipse( Brush, x-r, y-r, r, r );
}
xGraph.Dispose();
this.Invalidate();
}

// form load event
private void Form1_Load(object sender, System.EventArgs e)
{
DrawArea = new Bitmap(this.ClientRectangle.Width,
this.ClientRectangle.Height,
System.Drawing.Imaging.PixelFormat.Format24bppRgb);
InitializeDrawArea();
}

private void InitializeDrawArea()
{
Graphics xGraph;

xGraph = Graphics.FromImage(DrawArea);
// clear the drawing area to background color
xGraph.Clear(Color.LightYellow);
}

// free up resources on program exit
private void Form1_Closed(object sender, System.EventArgs e)
{
DrawArea.Dispose();
}

// paint event
private void Form1_Paint(object sender,
System.Windows.Forms.PaintEventArgs e)
{
Graphics xGraph;

xGraph = e.Graphics;
xGraph.DrawImage(DrawArea,0,0,DrawArea.Width,DrawArea.Height);
xGraph.Dispose();
}

// save drawing in bitmap DrawArea as a jpeg file
private void btnSave_Click(object sender, System.EventArgs e)
{
ImageFormat format = ImageFormat.Jpeg;
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "JPEG Files(*.jpg)|*.jpg";

if (sfd.ShowDialog() == DialogResult.OK)
{
// now save the image in the DrawArea
DrawArea.Save( sfd.FileName, format );
}
}

// clear the DrawArea
private void btnClear_Click(object sender, System.EventArgs e)
{
Graphics xGraph;

xGraph = Graphics.FromImage(DrawArea);
// clear the drawing area to bg color
xGraph.Clear(Color.LightYellow);
// free up resource
xGraph.Dispose();
// update
this.Invalidate();
}
}
}

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