我有一个自定义的WPF Canvas,我想在其上显示一个网格。我这样做是通过覆盖Canvas上的OnRender方法,并使用DrawingContext绘图函数。 IsGridVisible,GridWidth,GridHeight分别是每个网格线水平和垂直之间的像素数。
我还使用Canvas.LayoutTransform属性上的ScaleTransform来缩放Canvas项目,并且正如人们所期望的那样,网格线厚度乘以ScaleTransform缩放因子,如下图所示。有没有办法绘制单个像素线,无论当前的Canvas RenderTransform?
protected override void OnRender(System.Windows.Media.DrawingContext dc)
{
base.OnRender(dc);
if (IsGridVisible)
{
// Draw GridLines
Pen pen = new Pen(new SolidColorBrush(GridColour), 1);
pen.DashStyle = DashStyles.Dash;
for (double x = 0; x < this.ActualWidth; x += this.GridWidth)
{
dc.DrawLine(pen, new Point(x, 0), new Point(x, this.ActualHeight));
}
for (double y = 0; y < this.ActualHeight; y += this.GridHeight)
{
dc.DrawLine(pen, new Point(0, y), new Point(this.ActualWidth, y));
}
}
}
alt text http://www.freeimagehosting.net/uploads/f05ad1f602.png
答案 0 :(得分:2)
作为对原始帖子状态的评论。笔的厚度应设置为1.0 / zoom。