1、缩放
private void ImageShow_Load(object sender, EventArgs e)
{
pictureBox1.Load(@"E:\SQ1.jpg");
pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
pictureBox1.Dock = DockStyle.None;
} private void pictureBox1_MouseEnter(object sender, EventArgs e)
{
pictureBox1.Focus();
pictureBox1.Cursor = Cursors.SizeAll;
}
/// <summary>
/// 放大，缩小图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void pictureBox1_MouseWheel(object sender, MouseEventArgs e)
{
int i = e.Delta * SystemInformation.MouseWheelScrollLines / ; pictureBox1.Width = pictureBox1.Width + i;//增加picturebox的宽度
pictureBox1.Height = pictureBox1.Height + i;
pictureBox1.Left = pictureBox1.Left - i / ;//使picturebox的中心位于窗体的中心
pictureBox1.Top = pictureBox1.Top - i / ;//进而缩放时图片也位于窗体的中心
}
2、平移
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseDownPoint.X = Cursor.Position.X; //注：全局变量mouseDownPoint前面已定义为Point类型
mouseDownPoint.Y = Cursor.Position.Y;
isSelected = true;
}
} private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (isSelected && IsMouseInPanel())//确定已经激发MouseDown事件，和鼠标在picturebox的范围内
{
this.pictureBox1.Left = this.pictureBox1.Left + (Cursor.Position.X - mouseDownPoint.X);
this.pictureBox1.Top = this.pictureBox1.Top + (Cursor.Position.Y - mouseDownPoint.Y);
mouseDownPoint.X = Cursor.Position.X;
mouseDownPoint.Y = Cursor.Position.Y;
}
}
private bool IsMouseInPanel()
{
if (this.pan_picture.Left < PointToClient(Cursor.Position).X && PointToClient(Cursor.Position).X < this.pan_picture.Left + this.pan_picture.Width && this.pan_picture.Top < PointToClient(Cursor.Position).Y && PointToClient(Cursor.Position).Y < this.pan_picture.Top + this.pan_picture.Height)
{
return true;
}
else
{
return false;
}
} private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
isSelected = false;
}