在pictureBox中拖动图片的实现代码

最新推荐文章于 2025-06-13 11:16:24 发布

转载最新推荐文章于 2025-06-13 11:16:24 发布 · 1.5k 阅读

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本文介绍如何使用C#编程语言实现图片在窗体上的拖动功能，包括按下鼠标时改变光标样式、记录点击位置、计算偏移量并更新图片位置，以及释放鼠标时恢复光标样式和取消选择状态。

       bool wselected = false;
        Point p = new Point();
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            pictureBox1.Cursor = Cursors.Hand; //按下鼠标时，将鼠标形状改为手型
            wselected = true;
            p.X = e.X;
            p.Y = e.Y;
        }
        int driftX = 0, driftY = 0;
        int mx = 0, my = 0;
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (wselected)
            {
                driftX = p.X - e.X;
                driftY = p.Y - e.Y;

mx = mx - driftX;
my = my - driftY;

Bitmap bm = new Bitmap(this.pictureBox1.Image);

                Graphics g = pictureBox1.CreateGraphics();
                g.Clear(pictureBox1.BackColor);
                g.DrawImage(bm, mx, my);

p.X = e.X;
p.Y = e.Y;

                bm.Dispose();
                g.Dispose();
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            pictureBox1.Cursor = Cursors.Default; //松开鼠标时，形状恢复为箭头
            wselected = false;
        }