矩形框选择放大图片

[dzhl01]

我用picturebox调入图片,如何像acdsee实现用鼠标在图片上拖出一个虚矩形,然后将该部分放大

[tommir3]

切割图片，如果保存，再显示。
看人做过，不过没要过原码。

[dzhl01]

huwei001982给出的方法又时间也研究下,虽还不知正确与否,看出代码的份上,也要给分

[huwei001982]

Rectangle rect;
        Point pt = new Point();
        bool mouse = false;
        private void pic_MouseDown(object sender, MouseEventArgs e)
        {
            mouse = true;
            pt = pic.PointToScreen(e.Location);
            rect = new Rectangle(0, 0, 0, 0);
        }

        private void pic_MouseMove(object sender, MouseEventArgs e)
        {
            if (!mouse)
                return;
            ControlPaint.DrawReversibleFrame(rect, Color.Red, FrameStyle.Thick);
            Point pt2 = pic.PointToScreen(e.Location);
            rect = new Rectangle(pt, new Size(pt2.X - pt.X, pt2.Y - pt.Y));
            ControlPaint.DrawReversibleFrame(rect, Color.Red, FrameStyle.Thick);
        }

        private void pic_MouseUp(object sender, MouseEventArgs e)
        {
            mouse = false;
            Point pt2 = pic.PointToScreen(e.Location);
            rect = new Rectangle(pt, new Size(pt2.X - pt.X, pt2.Y - pt.Y));
            ControlPaint.DrawReversibleFrame(rect, Color.Red, FrameStyle.Thick);
            
            //放大图片
            float perWidth = pic.Width / (float)rect.Width;
            float perHeight = pic.Height / (float)rect.Height;
            pic.Width = (int)(pic.Width * perWidth);
            pic.Height = (int)(pic.Height * perHeight);

[huwei001982]

pic 是一个 picture 控件, 将它的SizeMode 设置为 StretchImage