Csharp/C Sharp by API/System.Drawing.Drawing2D/Matrix

Matrix.Rotate

  
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;
public class Form1 : System.Windows.Forms.Form {
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    protected override void OnPaint(PaintEventArgs e) {
        Graphics g = CreateGraphics();
        string txt = "HELLO";
        float alpha = 45.0f;
        int fontSize = 24;
        Point center = new Point(90, 20);
        FontFamily ff = new FontFamily("Times New Roman");
        Font f = new Font(ff, fontSize, FontStyle.Regular);
        StringFormat sf = new StringFormat();
        sf.FormatFlags = StringFormatFlags.DirectionVertical;
        g.DrawString(txt, f, new SolidBrush(Color.Blue), center, sf);
        g.TranslateTransform(center.X, center.Y);
        g.DrawEllipse(Pens.Magenta, new Rectangle(0, 0, 1, 1));
        GraphicsPath gp = new GraphicsPath();
        gp.AddString(txt, ff, (int)FontStyle.Bold, fontSize + 4, new Point(0, 0), sf);
        Matrix m = new Matrix();
        m.Rotate(alpha);
        gp.Transform(m);
        g.DrawPath(Pens.Red, gp);
        g.RotateTransform(-alpha);
        g.DrawString(txt, f, new SolidBrush(Color.Black), 0, 0, sf);
        gp.Dispose(); g.Dispose(); m.Dispose();
    }
}

Matrix.TransformPoints

  

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

    public class Matrix1
    {
        [STAThread]
        static void Main(string[] args)
        {
          Matrix m = new Matrix();
          m.Rotate(90, MatrixOrder.Append);
          m.Translate(7, 12, MatrixOrder.Append);
          Point[] p = {new Point(20, 45)};
          Console.WriteLine(p.GetValue(0).ToString());
          m.TransformPoints(p);
          Console.WriteLine(p.GetValue(0).ToString());
    
          Console.ReadLine();
        }
    }

Matrix.Translate

  

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

    public class Matrix1
    {
        [STAThread]
        static void Main(string[] args)
        {
          Matrix m = new Matrix();
          m.Rotate(90, MatrixOrder.Append);
          m.Translate(7, 12, MatrixOrder.Append);
          Point[] p = {new Point(20, 45)};
          Console.WriteLine(p.GetValue(0).ToString());
          m.TransformPoints(p);
          Console.WriteLine(p.GetValue(0).ToString());
    
          Console.ReadLine();
        }
    }

new Matrix

  

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class MobyDick: Form
{
     public static void Main()
     {
          Application.Run(new MobyDick());
     }
     public MobyDick()
     {
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          grfx.Transform = new Matrix(0.707f, 0.707f, -0.707f, 0.707f, 0, 0);
          grfx.DrawString("abc", Font, new SolidBrush(clr), 
                          new Rectangle(0, 0, cx, cy));
     }
}