在运行时在图片框中绘制一个框并将这些像素发送到函数 [英] drawing a box in a picture box in run time and sending those pixels to a function

问题描述

我有一个图片框，它从摄像头获取视频流。我有一个返回直方图的类，该部分工作正常。我希望能够在运行时使用我的鼠标并在
的图片框中绘制一个框，并获得一个统治的直方图。现在我有这个：

  int height = pictureBox1.Image.Height;
         int width = pictureBox1.Image.Width;


        Bitmap bmp = new Bitmap (pictureBox1.Image);
        // Luminance
        ImageStatisticsHSL hslStatistics = new ImageStatisticsHSL(bmp);
        int[] luminanceValues = hslStatistics.Luminance.Values;
        // RGB
        ImageStatistics rgbStatistics = new ImageStatistics(bmp);
        int[] redValues = rgbStatistics.Red.Values;
        int[] greenValues = rgbStatistics.Green.Values;
        int[] blueValues = rgbStatistics.Blue.Values;

如何从框中绘制区域并仅将其发送到我的ImageStatisticsHSL类？

推荐答案

处理源图片框的鼠标事件和绘图事件。在paint事件处理程序中绘制rect。

handle the mouse events and the paint event of the source pictureBox. Draw the rect in the paint event handler.

在检查rect的大小和位置后，通过克隆获取orig bmp的一部分。

Get a section of the orig bmp by cloning after checking the rect size and location.

    public partial class Form1 : Form
    {
        PictureBox p1 = new PictureBox();
        PictureBox p2 = new PictureBox();
        Point _st = new Point();
        Point _end = new Point();
        public Form1()
        {
            InitializeComponent();
            p1.Size = new Size(200, 200);
            p2.Size = new Size(200, 200);
            p1.Location = new Point(12, 12);
            p2.Location = new Point(224, 12);
            p2.SizeMode = PictureBoxSizeMode.Zoom;
            p1.MouseDown += P1_MouseDown;
            p1.MouseMove += P1_MouseMove;
            p1.MouseUp += P1_MouseUp;
            p1.Paint += P1_Paint;
            this.Controls.Add(p1);
            this.Controls.Add(p2);
            this.FormClosing += Form1_FormClosing;

            p1.Image = GetBitmap();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (p1.Image != null)
                p1.Image.Dispose();
            if (p2.Image != null)
                p2.Image.Dispose();
        }

        private Bitmap GetBitmap()
        {
            Bitmap bmp = new Bitmap(200, 200);
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
                g.Clear(Color.Green);
                g.FillEllipse(Brushes.Yellow, new RectangleF(0, 0, 200, 200));
            }
            return bmp;
        }

        private void P1_Paint(object sender, PaintEventArgs e)
        {
            if (_end.X - _st.X > 0 && _end.Y - _st.Y > 0)
                e.Graphics.DrawRectangle(Pens.Aqua, new Rectangle(_st.X, _st.Y, _end.X - _st.X, _end.Y - _st.Y));
        }

        private void P1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                _end = e.Location;
                if (_end.X > p1.Image.Width - 1)
                    _end = new Point(p1.Image.Width - 1, _end.Y);
                if (_end.Y > p1.Image.Height - 1)
                    _end = new Point(_end.X, p1.Image.Height - 1);
                if (_st.X >= 0 && _st.Y >= 0 && _end.X < p1.Image.Width && _end.Y < p1.Image.Height)
                {
                    if (_end.X - _st.X > 0 && _end.Y - _st.Y > 0)
                    {
                        Bitmap bmp = (Bitmap)p1.Image;

                        Image iOld = p2.Image;
                        p2.Image = bmp.Clone(new Rectangle(_st.X, _st.Y, _end.X - _st.X, _end.Y - _st.Y), bmp.PixelFormat);

                        if (iOld != null)
                        {
                            iOld.Dispose();
                            iOld = null;
                        }
                    }
                }
            }
        }
        private void P1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                _end = e.Location;
                this.p1.Invalidate();
            }
        }

        private void P1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                _st = e.Location;
            }
        }
    }

问候，

  Thorsten

  Thorsten

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