public static void DisposeOverlayImage()
{
if (OverlayImage != null)
{
OverlayImage.Dispose();
OverlayImage = null;
}
}
/// <summary>
/// Redraws the OverlayImage and calls Invalidate on the PictureBox.
/// Removes the OverlayImage if not in EDIT mode or if there is no
/// HitLine and no HitPoint.
/// </summary>
public void redrawOverlay()
{
Debug.WriteLine("redrawOverlay: EDIT:" + " HitLine="
+ ((HitLine == null) ? "null" : "\"" + HitLine.Desc + "\"")
+ " HitPoint="
+ ((HitPoint == null) ? "null" : "X=" + HitPoint.Point.X));
if (ActiveMode != Mode.EDIT)
{
if (OverlayImage != null)
{
OverlayImage.Dispose();
OverlayImage = null;
}
pictureBox.Invalidate();
return;
}
if (HitLine == null && HitPoint == null)
{
if (OverlayImage != null)
{
OverlayImage.Dispose();
OverlayImage = null;
}
pictureBox.Invalidate();
return;
}
OverlayImage = new Bitmap(Image.Width, Image.Height);
float size = HIT_TOLERANCE;
float size2 = HIT_TOLERANCE * 1.5f;
using (var brush = new SolidBrush(SELECT_COLOR))
using (var littlePen = new Pen(SELECT_COLOR, LINE_WIDTH))
using (var littlePenBlack = new Pen(Color.Black, 2))
using (Graphics g = Graphics.FromImage(OverlayImage)) {
g.Clear(Color.Transparent);
if (HitLine != null)
{
// Draw new color over the lines
Point[] points = HitLine.Points.ToArray();
g.DrawLines(littlePen, points);
foreach (Point point in HitLine.Points)
{
RectangleF rect = centeredSquare(point, size);
g.FillEllipse(brush, rect);
}
}
if (HitPoint != null)
{
RectangleF rect = centeredSquare(HitPoint.Point, size2);
g.DrawEllipse(littlePenBlack, rect);
}
}
pictureBox.Invalidate();
}