C# OxyPlot 区域波形选中放大
时间: 2024-09-19 15:12:23 浏览: 32
在C#的OxyPlot中,如果你想实现在区域内的波形局部放大,通常会使用`ZoomBoxView`和`PanView`结合来完成。以下是一个简单的示例:
1. 首先,在`PlotModel`上添加这两个视图:
```csharp
var zoomBoxView = new ZoomBoxView();
var panView = new PanView();
plotModel.Axes.Add(yAxis);
plotModel.Viewport = new Rectangle(0, 0, plotModel.ActualWidth, plotModel.ActualHeight); // 初始化视口
plotModel.Visualizations.Add(zoomBoxView);
plotModel.Visualizations.Add(panView);
```
2. 当用户点击并拖动鼠标时,`ZoomBoxView`会对选中的区域进行缩放:
```csharp
plotModel.MouseDown += (sender, e) => {
if (!zoomBoxView.IsDragging)
zoomBoxView.StartDrag(e.Position);
};
plotModel.MouseMove += (sender, e) => {
if (zoomBoxView.IsDragging)
zoomBoxView.UpdateDrag(e.Position);
};
plotModel.MouseUp += (sender, e) => {
if (zoomBoxView.IsDragging)
zoomBoxView.EndDrag();
};
```
3. 为了在缩放后保持原点不变,可以在`UpdateZoomBox`事件中调整视口:
```csharp
zoomBoxView.ZoomChanged += (sender, args) => {
double xMin, xMax, yMin, yMax;
plotModel.GetRange(args.Center.X, args.Size.Width, out xMin, out xMax);
plotModel.GetRange(args.Center.Y, args.Size.Height, out yMin, out yMax);
// 选择需要放大的范围,比如选取选区的50%作为放大区域
double scale = 2.0;
viewport = new Rectangle(xMin - xMax * scale / 2, yMin - yMax * scale / 2, xMax * scale, yMax * scale);
plotModel.Viewport = viewport;
};
```
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