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private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (comboBox1.SelectedIndex)
{
case 0: SetTypography(2, 3); break;
case 1: SetTypography(3, 3); break;
case 2: SetTypography(4, 3); break;
default:
break;
}
}
private void SetTypography(int x,int y)
{
panel1.Controls.Clear();
for (int i = 0; i < y; i++)
{
for (int j = 0; j < x; j++)
{
PictureBox pbox = new PictureBox();
pbox.Image = Image.FromFile(@"C:\Users\ws\Desktop\one team one goal.jpg");
pbox.SizeMode = PictureBoxSizeMode.Zoom;
pbox.Width = 250;
pbox.Height = 150;
pbox.DoubleClick += Pbox_DoubleClick;
pbox.Location = new Point(i * 260+10, j *150+10);
panel1.Controls.Add(pbox);
}
}
}
int zoomStep = 50;
private void Pbox_MouseWheel(object sender, MouseEventArgs e)
{
PictureBox pbox = sender as PictureBox;
int x = e.Location.X;
int y = e.Location.Y;
int ow = pbox.Width;
int oh = pbox.Height;
int VX, VY; //因缩放产生的位移矢量
if (e.Delta > 0) //放大
{
//第①步
pbox.Width += zoomStep;
pbox.Height += zoomStep;
//第②步
PropertyInfo pInfo = pbox.GetType().GetProperty("ImageRectangle", BindingFlags.Instance |
BindingFlags.NonPublic);
Rectangle rect = (Rectangle)pInfo.GetValue(pbox, null);
//第③步
pbox.Width = rect.Width;
pbox.Height = rect.Height;
}
if (e.Delta < 0) //缩小
{
//防止一直缩成负值
if (pbox.Width < 300)
return;
pbox.Width -= zoomStep;
pbox.Height -= zoomStep;
PropertyInfo pInfo = pbox.GetType().GetProperty("ImageRectangle", BindingFlags.Instance |
BindingFlags.NonPublic);
Rectangle rect = (Rectangle)pInfo.GetValue(pbox, null);
pbox.Width = rect.Width;
pbox.Height = rect.Height;
}
//第④步，求因缩放产生的位移，进行补偿，实现锚点缩放的效果
VX = (int)((double)x * (ow - pbox.Width) / ow);
VY = (int)((double)y * (oh - pbox.Height) / oh);
pbox.Location = new Point(pbox.Location.X + VX, pbox.Location.Y + VY);
}
Point oldPoint = default;
private bool isMove=false;
private Point mouseDownPoint;
private void Pbox_DoubleClick(object sender, EventArgs e)
{
PictureBox pbox = sender as PictureBox;
if (pbox.Width == 250)
{
oldPoint = pbox.Location;
}
if (pbox.Width == 250)
{
pbox.Width = 780;
pbox.Height = 458;
pbox.MouseWheel += Pbox_MouseWheel;
pbox.MouseDown += pictureBox1_MouseDown;
pbox.MouseUp += pictureBox1_MouseUp;
pbox.MouseMove += pictureBox1_MouseMove;
pbox.Location = new Point(10, 0);
pbox.BringToFront();
}
else
{
pbox.Width = 250;
pbox.Height = 150;
pbox.Location = oldPoint;
pbox.MouseWheel -= Pbox_MouseWheel;
pbox.MouseDown -= pictureBox1_MouseDown;
pbox.MouseUp -= pictureBox1_MouseUp;
pbox.MouseMove -= pictureBox1_MouseMove;
}
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
PictureBox pbox = sender as PictureBox;
if (e.Button == MouseButtons.Left)
{
mouseDownPoint.X = Cursor.Position.X; //记录鼠标左键按下时位置
mouseDownPoint.Y = Cursor.Position.Y;
isMove = true;
pbox.Focus(); //鼠标滚轮事件(缩放时)需要picturebox有焦点
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isMove = false;
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
PictureBox pbox = sender as PictureBox;
pbox.Focus(); //鼠标在picturebox上时才有焦点，此时可以缩放
if (isMove)
{
int x, y; //新的pictureBox1.Location(x,y)
int moveX, moveY; //X方向，Y方向移动大小。
moveX = Cursor.Position.X - mouseDownPoint.X;
moveY = Cursor.Position.Y - mouseDownPoint.Y;
x = pbox.Location.X + moveX;
y = pbox.Location.Y + moveY;
pbox.Location = new Point(x, y);
mouseDownPoint.X = Cursor.Position.X;
mouseDownPoint.Y = Cursor.Position.Y;
}
}<br><br>参考来自：<a href="https://www.jb51.net/article/147868.htm">https://www.jb51.net/article/147868.htm</a>
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