Question

C#中pictureBox鼠标拖动图片如何保存图片的拖动后的位置

代码： bool wselected = false;
bool mouseflag = false;
Point p = new Point();
private void pbHeadPicture_MouseDown(object sender, MouseEventArgs e)
{
pbHeadPicture.Cursor = Cursors.Hand;
mouseflag = true;
wselected = true;
p.X = e.X;
p.Y = e.Y;
}
int driftX = 0, driftY = 0;
int mx = 0, my = 0;
Bitmap bm;
private void pbHeadPicture_MouseMove(object sender, MouseEventArgs e)
{
if (wselected)
{
driftX = p.X - e.X;
driftY = p.Y - e.Y;

mx = mx - driftX;
my = my - driftY;
bm = new Bitmap(pbHeadPicture.Image);
Graphics g = pbHeadPicture.CreateGraphics();
g.Clear(pbHeadPicture.BackColor);
g.DrawImage(bm, mx, my);
p.X = e.X;
p.Y = e.Y;

}
}

private void pbHeadPicture_MouseUp(object sender, MouseEventArgs e)
{
pbHeadPicture.Cursor = Cursors.Default;
wselected = false;
}

想把图片保存， 但是bm还是原图

Answer 1

再定义一个Bitmap image
pbHeadPicture_MouseMove
在这个函数中再加
image = new Bitmap(pbHeadPicture.Width,pbHeadPicture.Height);
Graphics g1 = Graphics.FromImage(image);
g1.DrawImage(bm, mx, my);

然后保存的时候就用image就好了吧

追问

行啦，我写错了， 谢啦，