尝试制作缩放效果

发布于 2024-08-25 01:51:08 字数 694 浏览 5 评论 0原文

我正在尝试用鼠标滚轮在图片框上制作缩放效果。一切正常，除了当我使用鼠标中键放大或缩小时，可以，但它不会放大或缩小鼠标光标所在的点。当我放大该点时，我希望它始终滑动。请帮我添加一个代码片段以使其工作。

这是我的代码：

int i = 5;
int index = 10;
private double[] zoomfactor = { .25, .33, .50, .66, .80, 1, 1.25, 1.5, 2.0, 2.5, 3.0 };

private void Zoom(int i)
{

  double new_Zoom = zoomfactor[i];

  imgBox.Width = Convert.ToInt32(imgBox.Image.Width * new_Zoom);
  imgBox.Height = Convert.ToInt32(imgBox.Image.Height * new_Zoom);

}

private void On_wheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
  i = i + e.Delta / 120;
  if (i < 0)
  {
    i = 0;
  }
  else
  {
    if (i <= index)
      i = i;
    else
      i = index;
   }
   Zoom(i);
}

原文

I am trying to make a zoom effect on a picturebox with mouse wheel. Everything is OK except that when I use mouse middle button to zoom in or zoom out, it is ok, but it does not zoom in or zoom out the point which the mouse cursor is on. When I zoom in the point, I want it always slide. Please help me add a code snippet to make it work.

Here is my code:

int i = 5;
int index = 10;
private double[] zoomfactor = { .25, .33, .50, .66, .80, 1, 1.25, 1.5, 2.0, 2.5, 3.0 };

private void Zoom(int i)
{

  double new_Zoom = zoomfactor[i];

  imgBox.Width = Convert.ToInt32(imgBox.Image.Width * new_Zoom);
  imgBox.Height = Convert.ToInt32(imgBox.Image.Height * new_Zoom);

}

private void On_wheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
  i = i + e.Delta / 120;
  if (i < 0)
  {
    i = 0;
  }
  else
  {
    if (i <= index)
      i = i;
    else
      i = index;
   }
   Zoom(i);
}

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迷乱花海 2024-09-01 01:51:08

您需要根据鼠标相对于表单的位置来调整图片框的位置。

这是一个粗略但有效的示例，说明了如何执行此操作：

var i = 5;
var zoomfactor = new[] {.25, .33, .50, .66, .80, 1, 1.25, 1.5, 2.0, 2.5, 3.0};
var origin = new Point(100, 100);
var image = Image.FromFile(@"c:\example.png");
var imgBox = new PictureBox {
        Location = origin,
        Size = image.Size,
        Image = image,
        SizeMode = PictureBoxSizeMode.StretchImage
    };
var form = new Form {
        Size = new Size(800, 600),
        Controls = {imgBox}
    };
form.MouseWheel += (sender, e) => {
        i += e.Delta/120;
        if (i < 0) {
            i = 0;
        }
        if (i >= zoomfactor.Length) {
            i = zoomfactor.Length - 1;
        }
        var newZoom = zoomfactor[i];
        imgBox.Width = (int) (imgBox.Image.Width*newZoom);
        imgBox.Height = (int) (imgBox.Image.Height*newZoom);
        imgBox.Left = (int) (e.X - newZoom*(e.X - origin.X));
        imgBox.Top = (int) (e.Y - newZoom*(e.Y - origin.Y));
    };
form.ShowDialog();

You need to adjust the picture box location based on the mouse position relative to the form.

Here is a rough but working example of how you might do this:

var i = 5;
var zoomfactor = new[] {.25, .33, .50, .66, .80, 1, 1.25, 1.5, 2.0, 2.5, 3.0};
var origin = new Point(100, 100);
var image = Image.FromFile(@"c:\example.png");
var imgBox = new PictureBox {
        Location = origin,
        Size = image.Size,
        Image = image,
        SizeMode = PictureBoxSizeMode.StretchImage
    };
var form = new Form {
        Size = new Size(800, 600),
        Controls = {imgBox}
    };
form.MouseWheel += (sender, e) => {
        i += e.Delta/120;
        if (i < 0) {
            i = 0;
        }
        if (i >= zoomfactor.Length) {
            i = zoomfactor.Length - 1;
        }
        var newZoom = zoomfactor[i];
        imgBox.Width = (int) (imgBox.Image.Width*newZoom);
        imgBox.Height = (int) (imgBox.Image.Height*newZoom);
        imgBox.Left = (int) (e.X - newZoom*(e.X - origin.X));
        imgBox.Top = (int) (e.Y - newZoom*(e.Y - origin.Y));
    };
form.ShowDialog();

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