/*
* corner-always-threshold <angle-in-degrees>: if the angle at a pixel is less than this, it is considered a corner, even if it is within `corner-surround' pixels of another corner; default is 60.
* corner-surround <unsigned>: number of pixels on either side of a point to consider when determining if that point is a corner; default is 4.
* corner-threshold <angle-in-degrees>: if a pixel, its predecessor(s), and its successor(s) meet at an angle smaller than this, it's a corner; default is 100.
* despeckle-level <unsigned>: 0..20; default is no despeckling.
* despeckle-tightness <real>: 0.0..8.0; default is 2.0.
* imageerror-threshold <real>: subdivide fitted curves that are off by more pixels than this; default is 2.0.
* filter-iterations <unsigned>: smooth the curve this many times before fitting; default is 4.
* line-reversion-threshold <real>: if a spline is closer to a straight line than this, weighted by the square of the curve length, keep it a straight line even if it is a list with curves; default is .01.
* line-threshold <real>: if the spline is not more than this far away from the straight line defined by its endpoints, then output a straight line; default is 1.
* preserve-width: whether to preserve line width prior to thinning.
* remove-adjacent-corners: remove corners that are adjacent.
* tangent-surround <unsigned>: number of points on either side of a point to consider when computing the tangent at that point; default is 3.
*/
//System.Text.RegularExpressions.Regex colorRegex = new System.Text.RegularExpressions.Regex("stroke:#([0-9a-fA-F]+);", System.Text.RegularExpressions.RegexOptions.Compiled);
private void PreviewCenterline(Bitmap bmp)
{
try
{
if (MustExitTH)
{
return;
}
Svg.SvgDocument svg = Autotrace.BitmapToSvgDocument(bmp, UseCornerThreshold, CornerThreshold, UseLineThreshold, LineThreshold);
if (MustExitTH)
{
return;
}
using (Graphics g = Graphics.FromImage(bmp))
{
g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.White)), g.ClipBounds);
if (MustExitTH)
{
return;
}
GraphicsPath path = new GraphicsPath();
svg.Draw(path);
g.SmoothingMode = SmoothingMode.HighQuality;
g.DrawPath(Pens.Red, path);
}
}
catch (Exception ex)
{
using (Graphics g = Graphics.FromImage(bmp))
{
if (MustExitTH)
{
return;
}
g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.White)), g.ClipBounds);
if (MustExitTH)
{
return;
}
StringFormat format = new StringFormat();
format.LineAlignment = StringAlignment.Center;
format.Alignment = StringAlignment.Center;
g.DrawString(ex.Message, SystemFonts.DefaultFont, Brushes.Red, new RectangleF(0, 0, bmp.Width, bmp.Height), format);
if (MustExitTH)
{
return;
}
}
}
}
/*
* corner-always-threshold <angle-in-degrees>: if the angle at a pixel is less than this, it is considered a corner, even if it is within `corner-surround' pixels of another corner; default is 60.
* corner-surround <unsigned>: number of pixels on either side of a point to consider when determining if that point is a corner; default is 4.
* corner-threshold <angle-in-degrees>: if a pixel, its predecessor(s), and its successor(s) meet at an angle smaller than this, it's a corner; default is 100.
* despeckle-level <unsigned>: 0..20; default is no despeckling.
* despeckle-tightness <real>: 0.0..8.0; default is 2.0.
* imageerror-threshold <real>: subdivide fitted curves that are off by more pixels than this; default is 2.0.
* filter-iterations <unsigned>: smooth the curve this many times before fitting; default is 4.
* line-reversion-threshold <real>: if a spline is closer to a straight line than this, weighted by the square of the curve length, keep it a straight line even if it is a list with curves; default is .01.
* line-threshold <real>: if the spline is not more than this far away from the straight line defined by its endpoints, then output a straight line; default is 1.
* preserve-width: whether to preserve line width prior to thinning.
* remove-adjacent-corners: remove corners that are adjacent.
* tangent-surround <unsigned>: number of points on either side of a point to consider when computing the tangent at that point; default is 3.
*/
//System.Text.RegularExpressions.Regex colorRegex = new System.Text.RegularExpressions.Regex("stroke:#([0-9a-fA-F]+);", System.Text.RegularExpressions.RegexOptions.Compiled);
private void PreviewCenterline(Bitmap bmp)
{
Svg.SvgDocument svg = Autotrace.BitmapToSvgDocument(bmp, UseCornerThreshold, CornerThreshold, UseLineThreshold, LineThreshold);
if (MustExitTH)
{
return;
}
using (Graphics g = Graphics.FromImage(bmp))
{
g.FillRectangle(new SolidBrush(Color.FromArgb(180, Color.White)), g.ClipBounds);
if (MustExitTH)
{
return;
}
GraphicsPath path = new GraphicsPath();
svg.Draw(path);
g.SmoothingMode = SmoothingMode.HighQuality;
g.DrawPath(Pens.Red, path);
}
}
