WPF绘图性能问题
2024-10-07 22:19:40
代码：
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DrawPanel chart_ = new DrawPanel();
LineCanvas _mask = new LineCanvas();
grid1.Children.Add(chart_);
grid1.Children.Add(_mask);
chart_.plot();
}
}
public class LineCanvas : Canvas
{
public LineCanvas()
{
Background = Brushes.Transparent;
var line = new Line()
{
StrokeThickness = 2,
Stroke = System.Windows.Media.Brushes.Black,
};
this.Children.Add(line);
MouseMove += (send, e) =>
{
Point point = e.GetPosition(this);
line.X1 = point.X;
line.Y1 = 0;
line.X2 = point.X;
line.Y2 = ActualHeight;
};
}
}
public class DrawPanel : Panel
{
private DrawingVisual _drawingVisual = new DrawingVisual();
public DrawPanel()
{
this.AddVisualChild(_drawingVisual);
IsHitTestVisible = false;
}
public Pen p = new Pen(Brushes.Gainsboro, 1.0);
public void plot()
{
p.Freeze();
var dc = _drawingVisual.RenderOpen();
_drawingVisual.CacheMode = new BitmapCache();//这句话是关键，加了性能直接提升
for (int x = 0; x < 10000; x++)
{
double xx = 700.0 / 2 + ((x / 10000.0) * (700.0 / 2.0));
Point p1 = new Point(xx, 0);
Point p2 = new Point(xx, 353);
dc.DrawLine(p, p1, p2);
}
dc.Close();
}
protected override int VisualChildrenCount
{
get { return 1; }
}
protected override Visual GetVisualChild(int index)
{
if (index == 0)
return _drawingVisual;
throw new IndexOutOfRangeException();
}
}最新文章
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