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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9.  
  10. namespace アフィン変換サンプル___
  11. {
  12.     public partial class Form1 : Form
  13.     {
  14.         static PointF[] Arrow = new PointF[] { new PointF(0, 2), new PointF(1.5f, 1), new PointF(1, 1), new PointF(1, -1), new PointF(-1, -1), new PointF(-1, 1), new PointF(-1.5f, 1) };
  15.         PointF[] ArrowD = new PointF[Arrow.Count()];
  16.  
  17.         double Direction = 0;
  18.         float Sc = 32;//Scale. コントロールに同名の何かが会ったから短くした。
  19.  
  20.         uint Mode = 3;
  21.  
  22.         public Form1()
  23.         {
  24.             InitializeComponent();
  25.             Application.Idle += new EventHandler(OnIdle);
  26.         }
  27.  
  28.         void OnIdle(object sender, EventArgs e)
  29.         {  
  30.             PointF Move= new PointF(this.ClientSize.Width/2.0f,this.ClientSize.Height/2.0f);
  31.  
  32.             for (int i = 0; i < Arrow.Count(); i++)
  33.             {
  34.                 ArrowD[i] = TransForm(Arrow[i], Direction, new SizeF(Sc, Sc), Move);//大変換！！
  35.             }
  36.             this.Invalidate(false);
  37.             System.Threading.Thread.Sleep(15);
  38.         }
  39.  
  40.         private void Form1_Paint(object sender, PaintEventArgs e)//event
  41.         {
  42.             Graphics g = e.Graphics;
  43.             g.FillPolygon(Brushes.Green, ArrowD);//多角形塗りつぶし。
  44.  
  45.             float X = this.ClientSize.Width / 2;
  46.             float Y = this.ClientSize.Height / 2;
  47.             float L = 8;
  48.  
  49.             g.DrawLine(Pens.Black, X - L, Y, X + L, Y);
  50.             g.DrawLine(Pens.Black, X, Y - L, X, Y + L);
  51.         }
  52.  
  53.         private void Form1_MouseMove(object sender, MouseEventArgs e)//event
  54.         {                
  55.             float X = this.ClientSize.Width/2.0f-e.X;
  56.             float Y = this.ClientSize.Height/2.0f-e.Y;
  57.  
  58.             if ((Mode&1) !=0) Direction = Math.Atan2(Y, X) + ToRadian(90);
  59.             if ((Mode&2) !=0) Sc = (float)Math.Sqrt(X * X + Y * Y);
  60.  
  61.         }
  62.  
  63.         private void Form1_MouseDown(object sender, MouseEventArgs e)//event
  64.         {            
  65.             Mode %= 3;
  66.             Mode++;
  67.         }
  68.  
  69.         double SingleRadian = Math.PI / 180.0; 
  70.  
  71.         public double ToRadian(double Degree)
  72.         {
  73.             return SingleRadian * (Degree % 360.0);
  74.         }
  75.         public double ToDegree(double Radian)
  76.         {
  77.             return (Radian / SingleRadian) % 360.0;
  78.         }
  79.         public PointF TransForm(PointF Pos, double RotRadian, SizeF Scale, PointF Move)
  80.         {
  81.             PointF Ret = new PointF();
  82.             double Sin = Math.Sin(RotRadian);
  83.             double Cos = Math.Cos(RotRadian);
  84.  
  85.             Ret.X = (float)(((Pos.X * Scale.Width) * Cos) - ((Pos.Y * Scale.Height) * Sin) + Move.X);
  86.             Ret.Y = (float)(((Pos.X * Scale.Width) * Sin) + ((Pos.Y * Scale.Height) * Cos) + Move.Y);
  87.  
  88.             return Ret;
  89.         }
  90.  
  91.     }
  92. }
  93.  
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https://ideone.com/NAAKO
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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