public bool NextDraw(Point pt, IDrawingContext dc, bool isFinal)
{
Points[1] = pt;
double radius = Math.Atan((Points[1].X - Points[0].X) / (Points[0].Y - Points[1].Y));
double degree = radius * 180 / Math.PI;
if (degree < 0)
{
if (Points[1].X > Points[0].X)
{
degree = 180 + degree;
}
}
else
{
if (Points[1].X < Points[0].X)
{
degree = 180 + degree;
}
}
IPen pen = DrawingObjectFactory.CreatePen(MeasureColor, MeasureThickness);
if (MeasureDashes != null)
{
pen.Dashes = MeasureDashes;
}
//Trace.WriteLine(radius + "," + degree);
RotateTransform transferm = new RotateTransform()
{
Angle = degree,
CenterX = Points[0].X,
CenterY = Points[0].Y
};
dc.PushTransform(transferm);
Point pt1 = new Point(Points[0].X + 3, Points[0].Y);
Point pt2 = new Point(Points[0].X - 3, Points[0].Y);
dc.DrawLine(pen, pt1, pt2);
double value = -Math.Sqrt(Math.Abs(Points[0].X - Points[1].X) * Math.Abs(Points[0].X - Points[1].X) + Math.Abs(Points[0].Y - Points[1].Y) * Math.Abs(Points[0].Y - Points[1].Y));
Point pt3 = new Point(Points[0].X, Points[0].Y + value);
dc.DrawLine(pen, Points[0], pt3);
pt1 = new Point(Points[0].X + 3, Points[0].Y + value);
pt2 = new Point(Points[0].X - 3, Points[0].Y + value);
dc.DrawLine(pen, pt1, pt2);
dc.Pop();
ITextFormat format = DrawingObjectFactory.CreateTextFormat(measureValue.ToString("P2"), FlowDirection, FontFamily, FontStyle, FontWeight, FontStretch, FontSize, Foreground);
Point ptText = Points[1];
ptText.Y -= format.Height;
dc.DrawText(format, ptText);
return(false);
}
private ITextFormat CreateDynamicScaleTextFormat(string text)
{
return(DrawingObjectFactory.CreateTextFormat(text,
FlowDirection, FontFamily, FontStyle, FontWeight, FontStretch, FontSize, Foreground));
}
