Question

我想在Polyline中绘制Visual Layer。这是我用来绘制Line的代码。我应该绘制多个Lines并将其添加到VisualCollection还是有更好的方式？

var drawingVisual = new DrawingVisual();
using (var dc = drawingVisual.RenderOpen())
{
    var myPen = new Pen
    {
        Thickness = thickness,
        Brush = Settings.GridColor
    };
    myPen.Freeze();
    dc.DrawLine(myPen, pt1, pt2);
}

Answer 1

我认为使用DrawGeometry比使用DrawLine更好。

示例：

var myPen = new Pen
{
    Thickness = thickness,
    Brush = Settings.GridColor
};
myPen.Freeze();


var geometry = new StreamGeometry();
using (StreamGeometryContext ctx = geometry.Open())
{
    ctx.BeginFigure(new Point(10, 100), true /* is filled */, true /* is closed */);
    ctx.LineTo(new Point(100, 100), true /* is stroked */, false /* is smooth join */);
    ctx.LineTo(new Point(100, 50), true /* is stroked */, false /* is smooth join */);
}
geometry.Freeze();

dc.DrawGeometry(null, myPen, geometry);

Answer 2

我不认为有更好的方法，除了调用myPen.Freeze()我只会将其创建为const。我不知道这是否真的更有效，我只是认为它将来会更多地清除代码。我也会（个人事物）不使用var关键字，因为当您拨打drawingVisual.RenderOpen()时，您创建的类型会更不明确。

使用c＃在DrawingContext中绘制折线

2 个答案: