Mega Code Archive
Draw Polygon
<![CDATA[
/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace Poly
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class PolyclsMain : System.Windows.Forms.Form
{
private System.Windows.Forms.MainMenu mainMenu1;
private System.Windows.Forms.MenuItem menuItem1;
private System.Windows.Forms.MenuItem mnuFileExit;
private System.Windows.Forms.Label label1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public PolyclsMain()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
InitForm ();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
clsPoint pt = new clsPoint (50, 50);
clsEllipse ellipse = new clsEllipse (200, 150, 150, 75, 450);
clsCircle circle = new clsCircle (400, 150, 150);
clsLine line = new clsLine (400, 150, 150, 450);
// clsShape [] Shapes;
private void InitForm ()
{
// Shapes = new clsShape [] {pt, ellipse, circle, line};
pt.color = Color.Red;
this.MaximumSize = new Size (this.Bounds.Width, this.Bounds.Height);
this.MinimumSize = this.MaximumSize;
ellipse.color = Color.DarkOrange;
line.color = Color.Blue;
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.mnuFileExit = new System.Windows.Forms.MenuItem();
this.menuItem1 = new System.Windows.Forms.MenuItem();
this.mainMenu1 = new System.Windows.Forms.MainMenu();
this.SuspendLayout();
//
// label1
//
this.label1.BackColor = System.Drawing.SystemColors.Window;
this.label1.Dock = System.Windows.Forms.DockStyle.Fill;
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(680, 341);
this.label1.TabIndex = 0;
this.label1.Paint += new System.Windows.Forms.PaintEventHandler(this.label1_Paint);
//
// mnuFileExit
//
this.mnuFileExit.Index = 0;
this.mnuFileExit.Text = "Exit";
this.mnuFileExit.Click += new System.EventHandler(this.mnuFileExit_Click);
//
// menuItem1
//
this.menuItem1.Index = 0;
this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
this.mnuFileExit});
this.menuItem1.Text = "File";
//
// mainMenu1
//
this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
this.menuItem1});
//
// clsMain
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(680, 341);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label1});
this.Menu = this.mainMenu1;
this.MinimizeBox = false;
this.Name = "Poly";
this.Text = "Poly";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new PolyclsMain());
}
private void mnuFileExit_Click(object sender, System.EventArgs e)
{
this.Close ();
}
int m_cx = 100;
int m_cy = 50;
private void label1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
// foreach (clsShape shape in Shapes)
// shape.Show (e);
pt.Show(e);
ellipse.Show (e);
circle.Show (e);
line.Show (e);
}
}
abstract public class clsShape
{
protected clsShape() { }
~clsShape ()
{
if (m_Pen != null)
m_Pen.Dispose ();
if (m_Brush != null)
m_Brush.Dispose ();
}
protected Pen m_Pen = null;
protected SolidBrush m_Brush = null;
public Color color
{
get
{
if (m_Brush == null)
m_Brush = new SolidBrush (Color.Black);
return (m_Brush.Color);
}
set
{
if (m_Brush != null)
m_Brush.Dispose ();
m_Brush = new SolidBrush (value);
}
}
protected virtual SolidBrush brush
{
get
{
if (m_Brush == null)
m_Brush = new SolidBrush (Color.Black);
return (m_Brush);
}
}
protected virtual Pen pen
{
get
{
if (m_Pen == null)
SetPen();
return (m_Pen);
}
set {SetPen ();}
}
private void SetPen ()
{
if (m_Brush == null)
m_Brush = new SolidBrush (Color.Black);
if (m_Pen != null)
m_Pen.Dispose ();
m_Pen = new Pen (m_Brush, 2);
}
public void Show (PaintEventArgs e)
{
Draw (e);
}
virtual protected void Draw (PaintEventArgs e)
{
}
protected void Rotate (int angle, Point ptCenter, Point [] ptControl)
{
// If the angle is 0, there's nothing to do
if (angle == 0)
return;
// The angle is in tenths of a degree. Convert to radians
double fAngle = (angle / 10.0) / 57.29578;
// Calculate the sine of the angle
double fSine = Math.Sin (fAngle);
// Calculate the cosing of the angle
double fCosine = Math.Cos (fAngle);
// Translate the center point so it can be the center of rotation
double fRotateX = ptCenter.X - ptCenter.X * fCosine - ptCenter.Y * fSine;
double fRotateY = ptCenter.Y + ptCenter.X * fSine - ptCenter.Y * fCosine;
for (int x = 0; x < ptControl.Length; ++x)
{
// Rotate the control point and add the translated center point
double fNewX = ptControl[x].X * fCosine + ptControl[x].Y *fSine + fRotateX;
double fNewY = -ptControl[x].X * fSine + ptControl[x].Y *fCosine + fRotateY;
// Put the new values in the control point
ptControl[x].X = (int) fNewX;
ptControl[x].Y = (int) fNewY;
}
}
}
public class clsPoint : clsShape
{
protected clsPoint () { }
public clsPoint (int cx, int cy)
{
m_cx = cx;
m_cy = cy;
}
public int cx
{
get {return(m_cx);}
set {m_cx = value;}
}
public int cy
{
get {return(m_cy);}
set {m_cy = value;}
}
protected int m_cx;
protected int m_cy;
override protected void Draw (PaintEventArgs e)
{
Point pt1 = new Point (m_cx, m_cy - 1);
Point pt2 = new Point (m_cx, m_cy + 1);
e.Graphics.DrawLine (pen, pt1, pt2);
pt1.X = m_cx - 1;
pt2.X = m_cx + 1;
pt1.Y = pt2.Y = m_cy;
e.Graphics.DrawLine (pen, pt1, pt2);
e.Graphics.DrawRectangle (pen, m_cx - 3, m_cy - 3, 6, 6);
}
}
public class clsLine : clsShape
{
protected clsLine () { }
public clsLine (int cx, int cy, int length, int angle)
{
m_Start = new Point (cx, cy);
m_End = new Point (cx + length, cy);
m_Angle = angle;
}
protected Point m_End;
protected Point m_Start;
protected int m_Angle;
override protected void Draw (PaintEventArgs e)
{
Point ptStart = new Point (m_Start.X, m_Start.Y);
Point [] ptEnd = new Point[1] {new Point (m_End.X, m_End.Y)};
Rotate (m_Angle, ptStart, ptEnd);
e.Graphics.DrawLine (pen, ptStart, ptEnd[0]);
}
}
public class clsCircle : clsPoint
{
protected clsCircle () { }
public clsCircle (int cx, int cy, int radius)
{
m_cx = cx;
m_cy = cy;
m_Radius = radius;
}
protected int m_Radius;
override protected void Draw (PaintEventArgs e)
{
e.Graphics.DrawEllipse (pen, m_cx - m_Radius, m_cy - m_Radius, 2 * m_Radius, 2 * m_Radius);
DrawCenter (e);
}
public void DrawCenter (PaintEventArgs e)
{
base.Draw (e);
}
}
/// <summary>
/// Draws an ellipse using Bezier points
/// </summary>
public class clsEllipse : clsCircle, IDisposable
{
protected clsEllipse () { }
public void Dispose ()
{
}
public clsEllipse (int cx, int cy, int horiz, int vert, int rotate)
{
m_cx = cx;
m_cy = cy;
m_Radius = horiz;
m_Vert = vert;
m_Rotate = rotate;
}
protected double m_Eccentric;
protected int m_Vert;
protected int m_Rotate;
/// <summary>
/// Overridden from the clsCircle class
/// </summary>
/// <param name="e"></param>
override protected void Draw (PaintEventArgs e)
{
int OffsetX = (int) (2 * m_Radius * (2 * (Math.Sqrt(2) - 1) / 3) + 0.5);
int OffsetY = (int) (2 * m_Vert * (2 * (Math.Sqrt(2) - 1) / 3) + 0.5);
Point [] ptEllipse = new Point [13]
{
new Point (m_cx + m_Radius, m_cy),
new Point (m_cx + m_Radius, m_cy - OffsetY),
new Point (m_cx + OffsetX, m_cy - m_Vert),
new Point (m_cx, m_cy - m_Vert),
new Point (m_cx - OffsetX, m_cy - m_Vert),
new Point (m_cx - m_Radius, m_cy - OffsetY),
new Point (m_cx - m_Radius, m_cy),
new Point (m_cx - m_Radius, m_cy + OffsetY),
new Point (m_cx - OffsetX, m_cy + m_Vert),
new Point (m_cx, m_cy + m_Vert),
new Point (m_cx + OffsetX, m_cy + m_Vert),
new Point (m_cx + m_Radius, m_cy + OffsetY),
new Point (m_cx + m_Radius, m_cy)
};
Point ptCenter = new Point (m_cx, m_cy);
Rotate (m_Rotate, ptCenter, ptEllipse);
e.Graphics.DrawBeziers (pen, ptEllipse);
base.DrawCenter (e);
}
}
}
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