鼠标坐标的记录

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
  int originalWidth = this.pictureBox1.Image.Width;
  int originalHeight = this.pictureBox1.Image.Height;

  PropertyInfo rectangleProperty = this.pictureBox1.GetType().GetProperty("ImageRectangle", BindingFlags.Instance | BindingFlags.NonPublic);
  Rectangle rectangle = (Rectangle)rectangleProperty.GetValue(this.pictureBox1, null);

  int currentWidth = rectangle.Width;
  int currentHeight = rectangle.Height;

  double rate = (double)currentHeight / (double)originalHeight;

  int black_left_width = (currentWidth == this.pictureBox1.Width) ? 0 : (this.pictureBox1.Width - currentWidth) / 2;
  int black_top_height = (currentHeight == this.pictureBox1.Height) ? 0 : (this.pictureBox1.Height - currentHeight) / 2;

  int zoom_x = e.X - black_left_width;
  int zoom_y = e.Y - black_top_height;

  double original_x = (double)zoom_x * rate;
  double original_y = (double)zoom_y * rate;

  StringBuilder sb = new StringBuilder();

  sb.AppendFormat("原始尺寸{0}/{1}(宽/高)\r\n", originalWidth, originalHeight);
  sb.AppendFormat("缩放状态图片尺寸{0}/{1}(宽/高)\r\n", currentWidth, currentHeight);
  sb.AppendFormat("缩放比率{0}\r\n", rate);
  sb.AppendFormat("左留白宽度{0}\r\n", black_left_width);
  sb.AppendFormat("上留白高度{0}\r\n", black_top_height);
  sb.AppendFormat("当前鼠标坐标{0}/{1}(X/Y)\r\n", e.X, e.Y);
  sb.AppendFormat("缩放图中鼠标坐标{0}/{1}(X/Y)\r\n", zoom_x, zoom_y);
  sb.AppendFormat("原始图中鼠标坐标{0}/{1}(X/Y)\r\n", original_x, original_y);

  this.label1.Text = sb.ToString();
}