我正在尝试使用鼠标滚轮在图片框上进行缩放效果。一切都很好,除了当我使用鼠标中键放大或缩小时,没关系,但它不会放大或缩小鼠标光标所在的点。当我放大点时,我希望它总是滑动。请帮我添加一个代码段以使其正常工作。
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);
}
答案 0 :(得分:2)
您需要根据相对于表单的鼠标位置调整图片框位置。
以下是如何执行此操作的粗略但有效的示例:
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();
答案 1 :(得分:0)
您没有考虑鼠标坐标。
MouseEventArgs
类会告诉您鼠标的位置(X
,Y
和Location
属性),因此您需要进行相应的调整。