如何通过鼠标滚轮进行缩放时调整滚动条位置 [英] How to adjust scroll bar location when zoom by mouse wheel

问题描述

你好

在我的Windows窗体应用程序中，我有 UserControl ，里面有一个 PictureBox 。

当我在 PictureBox 上使用鼠标滚轮时，它的大小将会改变，而 UserControl 将自动滚动

现在我想要当我使用鼠标滚轮时，调整 UserControl 滚动条来排列鼠标位置

用更好的词语缩放到谷歌地图的鼠标位置！

Hello
In my windows form app, i have UserControl and inside it there is a PictureBox.
when i use mouse wheel on the PictureBox the size of it will changed and the UserControl will auto scroll
Now i want when i use the mouse wheel, adjust the UserControl scroll bars to arrange the mouse location
in better words "zoom to the mouse location like Google Maps!"

推荐答案

float sv = (float)testPnl1.VerticalScroll.Value / (float)testPnl1.VerticalScroll.Maximum;
float sh =                                                  (float)testPnl1.HorizontalScroll.Value/(float)testPnl1.HorizontalScroll.Maximum;
           
ImageWidth += zoom;

Pnl.AutoScrollPosition = new Point((int)(Pnl.HorizontalScroll.Maximum * sh), (int)(Pnl.VerticalScroll.Maximum * sv));

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