using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
public class DrawStringAlignACircle : System.Windows.Forms.Form
{
public DrawStringAlignACircle()
{
InitializeComponent();
BackColor = SystemColors.Window;
ForeColor = SystemColors.WindowText;
}
protected override void OnPaint ( PaintEventArgs e )
{
Graphics g = e.Graphics;
SetScale(g);
DrawFace(g);
base.OnPaint(e);
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
}
[STAThread]
static void Main()
{
Application.Run(new DrawStringAlignACircle());
}
private void SetScale(Graphics g)
{
g.TranslateTransform(Width/2, Height/2);
float inches = Math.Min(Width / g.DpiX, Height / g.DpiX);
g.ScaleTransform(inches * g.DpiX / 2000, inches * g.DpiY / 2000);
}
private void DrawFace(Graphics g)
{
Brush brush = new SolidBrush(ForeColor);
Font font = new Font("Arial", 40);
float x, y;
const int numHours = 12;
const int deg = 360 / numHours;
const int FaceRadius = 450;
for (int i = 1; i <= numHours; i++)
{
SizeF stringSize =
g.MeasureString(i.ToString(),font);
x = GetCos(i*deg + 90) * FaceRadius;
x += stringSize.Width / 2;
y = GetSin(i*deg + 90) * FaceRadius;
y += stringSize.Height / 2;
g.DrawString(i.ToString(), font, brush, -x, -y);
}
brush.Dispose();
font.Dispose();
}
private static float GetSin(float degAngle)
{
return (float) Math.Sin(Math.PI * degAngle / 180f);
}
private static float GetCos(float degAngle)
{
return (float) Math.Cos(Math.PI * degAngle / 180f);
}
}
