/// <summary>
/// Draws rectangle annotation.
/// </summary>
/// <param name="image">Image.</param>
/// <param name="rect">User specified area to annotate.</param>
/// <param name="text">Label.</param>
/// <param name="font">Font to use. Default is "Arial" of size 10, style: Bold.</param>
public static void DrawAnnotation(this Bgr <byte>[,] image, Rectangle rect, string text, Font font)
{
const int VERTICAL_OFFSET = 5;
image.Draw(rect, Bgr <byte> .Red, 1);
var textSize = font.GetTextSize(text, 0);
var bottomLeftPt = new Point(rect.X + rect.Width / 2 - textSize.Width / 2, rect.Top - VERTICAL_OFFSET);
image.Draw(text, font, new Point(), Bgr <byte> .Black);
}
void videoCapture_InitFrame(object sender, EventArgs e)
{
videoCapture.ReadTo(ref frame);
if (frame == null)
{
return;
}
if (isROISelected)
{
initTracking(frame);
Application.Idle -= videoCapture_InitFrame;
Application.Idle += videoCapture_NewFrame;
return;
}
else
{
frame.Draw(roi, Bgr <byte> .Red, 3);
}
this.pictureBox.Image = frame.ToBitmap(); //it will be just casted (data is shared)
GC.Collect();
}
private static void drawContour(IList<PointF> controlPoints, Bgr<byte>[,] image)
{
const float CONTOUR_TENSION = 0;
/******************** contour and control points *********************/
var pointIndices = CardinalSpline.GetEqualyDistributedPointIndices(controlPoints, CONTOUR_TENSION, 500);
var points = CardinalSpline.InterpolateAt(controlPoints, CONTOUR_TENSION, pointIndices);
var normals = new List<LineSegment2DF>();
var normalIndices = CardinalSpline.GetEqualyDistributedPointIndices(controlPoints, CONTOUR_TENSION, 100);
foreach (var idx in normalIndices)
{
var pt = CardinalSpline.InterpolateAt(controlPoints, CONTOUR_TENSION, idx);
var normalDirection = CardinalSpline.NormalAt(controlPoints, CONTOUR_TENSION, idx);
var orientation = (int)Angle.ToDegrees(System.Math.Atan2(normalDirection.Y, normalDirection.X));
var normal = getLine(orientation, pt, 20);
normals.Add(normal);
}
/******************** contour and control points *********************/
image.Draw(points.Select(x=>x.Round()).ToArray(),
Bgr<byte>.Blue,
3);
image.Draw(controlPoints.Select(x => new Circle(x.Round(), 3)), Bgr<byte>.Red, 3);
//image.Draw(normals, Bgr<byte>.Green, 3, false);
}
private void drawPoints(Bgr<byte>[,] im, List<PointF> points)
{
foreach (var pt in points)
{
var rect = new RectangleF(pt.X, pt.Y, 1, 1);
rect.Inflate(winSize / 2, winSize / 2);
im.Draw(rect, Bgr<byte>.Red, 2);
}
}