WPF 通过分辨率 计算英寸,去除模糊
Matrix m = PresentationSource.FromVisual(this)
.CompositionTarget.TransformToDevice;
double dpiFactor = 1/m.M11;
Pen scaledPen = new Pen( Brushes.Black, 1 * dpiFactor );
protected override void OnRender(DrawingContext drawingContext)
{
Pen pen = new Pen(Brushes.Black, 1);
Rect rect = new Rect(20,20, 50, 60);
double halfPenWidth = pen.Thickness / 2;
// Create a guidelines set
GuidelineSet guidelines = new GuidelineSet();
guidelines.GuidelinesX.Add(rect.Left + halfPenWidth);
guidelines.GuidelinesX.Add(rect.Right + halfPenWidth);
guidelines.GuidelinesY.Add(rect.Top + halfPenWidth);
guidelines.GuidelinesY.Add(rect.Bottom + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawRectangle(null, pen, rect);
drawingContext.Pop();
}
http://www.wpftutorial.net/DrawOnPhysicalDevicePixels.html