/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// Circle.cs -- File to be used as a library assembly
//
// Compile this file with the following command line:
// C:>csc /t:library Circle.cs
using System;
namespace nsCircle
{
// A structure to define a Cartesian point.
public struct POINT
{
public POINT (int x, int y)
{
cx = x;
cy = y;
}
public int cx;
public int cy;
public override string ToString()
{
return (String.Format ("(" + cx + ", " + cy + ")"));
}
}
public class clsCircle
{
// Two constructors to define the circle.
public clsCircle (double radius, POINT center)
{
m_Center = center;
m_Radius = radius;
}
public clsCircle (double radius, int cx, int cy)
{
m_Center.cx = cx;
m_Center.cy = cy;
m_Radius = radius;
}
public clsCircle ()
{
m_Center.cx = 0;
m_Center.cy = 0;
m_Radius = 0;
}
public double Radius
{
get {return (m_Radius);}
set {m_Radius = value;}
}
public POINT Center
{
get {return (m_Center);}
set {m_Center = value;}
}
// Fields to contain circle data.
POINT m_Center;
private double m_Radius;
// Constants to make life easier
private const double pi = 3.14159;
private const double radian = 57.29578;
// Return the area of the circle
public double Area
{
get {return (m_Radius * m_Radius * pi);}
}
// Return the diameter of the circle
public double Diameter
{
get {return (2 * m_Radius);}
}
// Return the coordinates of a point on the circle at a given angle.
public POINT PointOnCircle (double degrees)
{
POINT pt;
double fAngle = degrees / radian;
// Compute the x position of the point
pt.cx = (int)((double) m_Radius * Math.Cos (fAngle) + 0.5);
// Compute the y position of the point
pt.cy = (int)((double) m_Radius * Math.Sin (fAngle) + 0.5);
return (pt);
}
// Return the area of a slice determined by a given angle.
public double AreaOfSlice (double degrees)
{
double fAngle = degrees / 57.29578;
return (Area * fAngle / (2 * pi));
}
}
}
// Geom.cs -- Demonstrates using an assembly.
//
// Compile this program with the following command line:
// C:>csc /r:circle.dll Geom.cs
using System;
using nsCircle;
namespace nsGeometry
{
class clsMain
{
static public void Main ()
{
double angle = 32.6;
// Create an instance of the circle class.
clsCircle circle = new clsCircle (420, 0, 0);
// Get the point on the circle at the angle.
POINT pt = circle.PointOnCircle (angle);
// Show the total area of the circle.
Console.WriteLine ("The area of the circle is " + circle.Area);
// Show the point.
Console.WriteLine ("The point on the circle is at " + pt);
// Show the area of the slice between 0 degrees and the angle.
Console.WriteLine ("The area of the slice is " +
circle.AreaOfSlice (angle));
}
}
}
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