单击图片框时获取PixelValue

本文关键字:获取 PixelValue 单击 | 更新日期: 2023-09-27 18:27:34

我正在处理一个.NET C#项目,希望在单击图片框时获得像素值,如何实现?

基本想法是,当我点击图片框中的任何位置时,我都会得到该图像点的像素值。。

谢谢!

单击图片框时获取PixelValue

@Hans指出,除非SizeModePictureBoxSizeMode.Normal or PictureBoxSizeMode.AutoSize不同,否则Bitmap.GetPixel应该有效。为了让它一直工作,让我们访问名为ImageRectanglePictureBox的私有属性。

PropertyInfo imageRectangleProperty = typeof(PictureBox).GetProperty("ImageRectangle", BindingFlags.GetProperty | BindingFlags.NonPublic | BindingFlags.Instance);
private void pictureBox1_Click(object sender, EventArgs e)
{
    if (pictureBox1.Image != null)
    {
        MouseEventArgs me = (MouseEventArgs)e;
        Bitmap original = (Bitmap)pictureBox1.Image;
        Color? color = null;
        switch (pictureBox1.SizeMode)
        {
            case PictureBoxSizeMode.Normal:
            case PictureBoxSizeMode.AutoSize:
                {
                    color = original.GetPixel(me.X, me.Y);
                    break;
                }
            case PictureBoxSizeMode.CenterImage:
            case PictureBoxSizeMode.StretchImage:
            case PictureBoxSizeMode.Zoom:
                {
                    Rectangle rectangle = (Rectangle)imageRectangleProperty.GetValue(pictureBox1, null);
                    if (rectangle.Contains(me.Location))
                    {
                        using (Bitmap copy = new Bitmap(pictureBox1.ClientSize.Width, pictureBox1.ClientSize.Height))
                        {
                            using (Graphics g = Graphics.FromImage(copy))
                            {
                                g.DrawImage(pictureBox1.Image, rectangle);
                                color = copy.GetPixel(me.X, me.Y);
                            }
                        }
                    }
                    break;
                }
        }
        if (!color.HasValue)
        {
            //User clicked somewhere there is no image
        }
        else
        { 
            //use color.Value
        }
    }
}

希望这能帮助

使用此:

private void pictureBox2_MouseUp(object sender, MouseEventArgs e)
{
    Bitmap b = new Bitmap(pictureBox1.Image);
    Color color = b.GetPixel(e.X, e.Y);
}

除非图片框有像素大小,否则我认为你做不到。Control onclick事件不会保存特定的单击位置。如果你谈论的是颜色,在c#中是不可能的