フリーフォーム選択クロップC＃

Question

ピクチャボックスでフリーフォーム選択（ペイントやフォトショップなど）を行い、その選択内容をトリミングしてフォルダに保存するにはどうすればよいですか？ は、私はすでに矩形収穫をしましたが、私はその自由形式の選択をしたい...ここ

は私の長方形の作物である：

Image img; 
    bool mouseClicked; 
    Point startPoint = new Point(); 
    Point endPoint = new Point(); 

    Rectangle rectCropArea; 

    private void Button1_Click(System.Object sender, System.EventArgs e) 
    { 
    } 

    private void OnLoad(System.Object sender, System.EventArgs e) 
    { 
     loadPrimaryImage(); 
    } 

    private void loadPrimaryImage() 
    { 
     img = Image.FromFile("..\\..\\images.jpg"); 
     PictureBox1.Image = img; 
    } 

    private void PicBox_MouseUp(System.Object sender, System.Windows.Forms.MouseEventArgs e) 
    { 
     mouseClicked = false; 
     if ((endPoint.X != -1)) { 
      Point currentPoint = new Point(e.X, e.Y); 
      Y1.Text = e.X.ToString(); 
      Y2.Text = e.Y.ToString(); 
     } 

     endPoint.X = -1; 
     endPoint.Y = -1; 
     startPoint.X = -1; 
     startPoint.Y = -1; 
    } 

    private void PicBox_MouseDown(System.Object sender, System.Windows.Forms.MouseEventArgs e) 
    { 
     mouseClicked = true; 
     startPoint.X = e.X; 
     startPoint.Y = e.Y; 
     //Display coordinates 
     X1.Text = startPoint.X.ToString(); 
     Y1.Text = startPoint.Y.ToString(); 

     endPoint.X = -1; 
     endPoint.Y = -1; 

     rectCropArea = new Rectangle(new Point(e.X, e.Y), new Size()); 
    } 

    private void PicBox_MouseMove(System.Object sender, System.Windows.Forms.MouseEventArgs e) 
    { 
     Point ptCurrent = new Point(e.X, e.Y); 


     if ((mouseClicked)) { 
      if ((endPoint.X != -1)) { 
       //Display Coordinates 
       X1.Text = startPoint.X.ToString(); 
       Y1.Text = startPoint.Y.ToString(); 
       X2.Text = e.X.ToString(); 
       Y2.Text = e.Y.ToString(); 
      } 

      endPoint = ptCurrent; 

      if ((e.X > startPoint.X & e.Y > startPoint.Y)) { 
       rectCropArea.Width = e.X - startPoint.X; 
       rectCropArea.Height = e.Y - startPoint.Y; 


      } else if ((e.X < startPoint.X & e.Y > startPoint.Y)) { 
       rectCropArea.Width = startPoint.X - e.X; 
       rectCropArea.Height = e.Y - startPoint.Y; 
       rectCropArea.X = e.X; 
       rectCropArea.Y = startPoint.Y; 

      } else if ((e.X > startPoint.X & e.Y < startPoint.Y)) { 
       rectCropArea.Width = e.X - startPoint.X; 
       rectCropArea.Height = startPoint.Y - e.Y; 
       rectCropArea.X = startPoint.X; 
       rectCropArea.Y = e.Y; 

      } else { 
       rectCropArea.Width = startPoint.X - e.X; 
       rectCropArea.Height = startPoint.Y - e.Y; 
       rectCropArea.X = e.X; 
       rectCropArea.Y = e.Y; 
      } 

      PictureBox1.Refresh(); 

     } 

    } 

    private void PicBox_Paint(System.Object sender, System.Windows.Forms.PaintEventArgs e) 
    { 
     Pen drawLine = new Pen(Color.Red); 
     drawLine.DashStyle = DashStyle.Dash; 
     e.Graphics.DrawRectangle(drawLine, rectCropArea); 
    } 

    private void btnCrop_Click(System.Object sender, System.EventArgs e) 
    { 
     PictureBox2.Refresh(); 

     Bitmap sourceBitmap = new Bitmap(PictureBox1.Image, PictureBox1.Width, PictureBox1.Height); 
     Graphics g = PictureBox2.CreateGraphics(); 

     if (!(CheckBox1.Checked)) { 
      g.DrawImage(sourceBitmap, new Rectangle(0, 0, PictureBox2.Width, PictureBox2.Height), rectCropArea, GraphicsUnit.Pixel); 
      sourceBitmap.Dispose(); 

     } else { 
      int x1 = 0; 
      int x2 = 0; 
      int y1 = 0; 
      int y2 = 0; 
      try { 
       x1 = Convert.ToInt32(CX1.Text); 
       x2 = Convert.ToInt32(CX2.Text); 
       y1 = Convert.ToInt32(CY1.Text); 
       y2 = Convert.ToInt32(CY2.Text); 
      } catch (Exception ex) { 
       MessageBox.Show("Enter valid Coordinates (only Integer values)"); 
      } 

      if (((x1 < x2 & y1 < y2))) { 
       rectCropArea = new Rectangle(x1, y1, x2 - x1, y2 - y1); 
      } else if ((x2 < x1 & y2 > y1)) { 
       rectCropArea = new Rectangle(x2, y1, x1 - x2, y2 - y1); 
      } else if ((x2 > x1 & y2 < y1)) { 
       rectCropArea = new Rectangle(x1, y2, x2 - x1, y1 - y2); 
      } else { 
       rectCropArea = new Rectangle(x2, y2, x1 - x2, y1 - y2); 
      } 

      PictureBox1.Refresh(); 
      //This repositions the dashed box to new location as per coordinates entered. 

      g.DrawImage(sourceBitmap, new Rectangle(0, 0, PictureBox2.Width, PictureBox2.Height), rectCropArea, GraphicsUnit.Pixel); 
      sourceBitmap.Dispose(); 
     } 
    } 

    private void pictureBox1_MouseClick(System.Object sender, System.Windows.Forms.MouseEventArgs e) 
    { 
     PictureBox1.Refresh(); 
    } 

    private void CheckBox1_CheckedChanged(System.Object sender, System.EventArgs e) 
    { 
     if ((CheckBox1.Checked)) { 
      CX1.Visible = true; 
      Label10.Visible = true; 
      CY1.Visible = true; 
      Label9.Visible = true; 
      CX2.Visible = true; 
      Label8.Visible = true; 
      CY2.Visible = true; 
      Label7.Visible = true; 

      X1.Text = "0"; 
      X2.Text = "0"; 
      Y1.Text = "0"; 
      Y2.Text = "0"; 

     } else { 
      CX1.Visible = false; 
      Label10.Visible = false; 
      CY1.Visible = false; 
      Label9.Visible = false; 
      CX2.Visible = false; 
      Label8.Visible = false; 
      CY2.Visible = false; 
      Label7.Visible = false; 
     } 

    } 
    public Form1() 
    { 
     Load += OnLoad; 
    } 
} 

Answer 1

あなたはポリゴンで作業する必要がある自由形式の選択をコピーします。

これは完全な例です。これを新しいソリューションに貼り付けて試してみてください（画像へのパスを変更するだけです）。 2つのピクチャボックスを作成し、最初のイメージボックスにイメージをロードし、イメージを作成します。最初の画像をクリックすると、2回クリックすると選択が表示されます。ボタンを押すだけで、選択した画像を他の画像ボックスにコピーしてからpng画像として保存します。

最初の画像からブラシを作成し、そのポリゴンを別の画像にペイントし、矩形の他のピクセルを選択した背景色（この場合はColor：Color.Transparent）に設定します。

例：

public partial class Form1 : Form { 
    private List<Point> _points = new List<Point>(); 
    private PictureBox _pictureBox1; 
    private PictureBox _pictureBox2; 
    private Button _button1; 
    public Form1() { 
     InitializeComponent(); 
    } 

    private void Form1_Load(object sender, EventArgs e) { 
     Size = new Size(1366, 675); 

     _pictureBox1 = new PictureBox { 
      Location = new Point(12, 51), 
      Size = new Size(651, 474), 
      BorderStyle = BorderStyle.FixedSingle 
     }; 
     _pictureBox2 = new PictureBox 
     { 
      Location = new Point(669, 51), 
      Size = new Size(651, 474), 
      BorderStyle = BorderStyle.FixedSingle 
     }; 
     _button1 = new Button { 
      Text = @"Copy selected area", 
      Location = new Point(13, 13), 
      Size = new Size(175, 23) 
     }; 
     Controls.AddRange(new Control[] { _pictureBox1, _pictureBox2, _button1 }); 

     _pictureBox1.Image = Image.FromFile(@"d:\temp\Hopetoun_falls.jpg"); 
     _points = new List<Point>(); 

     _pictureBox1.MouseDown += delegate(object o, MouseEventArgs args) { _points.Add(args.Location); _pictureBox1.Refresh(); }; 
     _pictureBox1.Paint += pictureBox1_Paint; 

     _button1.Click += button_Click; 
    } 

    private void pictureBox1_Paint(object sender, PaintEventArgs e) { 
     if (_points.Count < 2) { 
      return; 
     } 

     var max = _points.Count; 
     for (int i = 1; i < max; i++) { 
      e.Graphics.DrawLine(Pens.Red, _points[i-1].X, _points[i-1].Y, _points[i].X, _points[i].Y); 
     } 
     e.Graphics.DrawLine(Pens.Red, _points[max - 1].X, _points[max - 1].Y, _points[0].X, _points[0].Y); 
    } 

    private static Bitmap GetSelectedArea(Image source, Color bgColor, List<Point> points) { 
     var bigBm = new Bitmap(source); 
     using (var gr = Graphics.FromImage(bigBm)) { 
      // Set the background color. 
      gr.Clear(bgColor); 

      // Make a brush out of the original image. 
      using (var br = new TextureBrush(source)) { 
       // Fill the selected area with the brush. 
       gr.FillPolygon(br, points.ToArray()); 

       // Find the bounds of the selected area. 
       var sourceRect = GetPointListBounds(points); 

       // Make a bitmap that only holds the selected area. 
       var result = new Bitmap(sourceRect.Width, sourceRect.Height); 

       // Copy the selected area to the result bitmap. 
       using (var resultGr = Graphics.FromImage(result)) { 
        var destRect = new Rectangle(0, 0, sourceRect.Width, sourceRect.Height); 
        resultGr.DrawImage(bigBm, destRect, sourceRect, GraphicsUnit.Pixel); 
       } 

       // Return the result. 
       return result; 
      } 
     } 
    } 

    private static Rectangle GetPointListBounds(List<Point> points) { 
     int xmin = points[0].X; 
     int xmax = xmin; 
     int ymin = points[0].Y; 
     int ymax = ymin; 

     for (int i = 1; i < points.Count; i++) { 
      if (xmin > points[i].X) xmin = points[i].X; 
      if (xmax < points[i].X) xmax = points[i].X; 
      if (ymin > points[i].Y) ymin = points[i].Y; 
      if (ymax < points[i].Y) ymax = points[i].Y; 
     } 

     return new Rectangle(xmin, ymin, xmax - xmin, ymax - ymin); 
    } 
    private void button_Click(object sender, EventArgs e) { 
     if (_points.Count < 3) { 
      return; 
     } 

     var img = GetSelectedArea(_pictureBox1.Image, Color.Transparent, _points); 
     _pictureBox2.Image = img; 
     _pictureBox2.Image.Save(@"d:\temp\sample.png", ImageFormat.Png); 
    } 
}