/// <summary>
/// Draws barcode referenced points.
/// </summary>
/// <param name="canvas">The canvas.</param>
/// <param name="barcodeInfo">The barcode.</param>
/// <param name="paint">The paint information.</param>
private void DrawBarcodeReferencePoints(Canvas canvas, IBarcodeInfo barcodeInfo, Paint paint)
{
BarcodeInfo2D barcodeInfo2D = barcodeInfo as BarcodeInfo2D;
// if barcode is 2D barcode
if (barcodeInfo2D != null)
{
float cellSize = (float)(barcodeInfo2D.CellWidth + barcodeInfo2D.CellHeight) / 2;
if (cellSize > 15)
{
cellSize = 15;
}
foreach (System.Drawing.PointF point in barcodeInfo2D.GetReferencePoints())
{
canvas.DrawCircle(point.X, point.Y, cellSize / 2, paint);
}
}
}
/// <summary>
/// Draws the barcode information.
/// </summary>
/// <param name="canvas">A canvas.</param>
/// <param name="paint">A paint information.</param>
/// <param name="barcodeInfo">A barcode.</param>
/// <param name="scale">A scale value.</param>
private void DrawBarcodeInfo(Canvas canvas, Paint paint, IBarcodeInfo barcodeInfo, float scale)
{
int alpha;
// get barcode region
Region barcodeRegion = barcodeInfo.Region;
if (barcodeRegion == null)
{
return;
}
// determines whether barcode region should be filled
bool fill;
// if confidence of barcode recognition is "-1"
if (barcodeInfo.Confidence == -1)
{
alpha = 48;
paint.Color = Color.LimeGreen;
fill = true;
}
// if confidence of barcode recognition is no less than "95"
else if (barcodeInfo.Confidence >= 95)
{
alpha = 64;
paint.Color = Color.LimeGreen;
fill = true;
}
// if confidence of barcode recognition between 0 and 95
else
{
paint.Color = Color.Red;
BarcodeInfo2D barcodeInfo2D = barcodeInfo as BarcodeInfo2D;
if (barcodeInfo2D != null && barcodeInfo2D.GetReferencePoints().Length > 0)
{
alpha = 64;
fill = false;
}
else
{
alpha = 32;
fill = true;
}
}
// if barcode region should be filled
if (fill)
{
paint.Alpha = alpha;
// fill barcode region
FillRegion(canvas, barcodeInfo.Region, paint);
}
paint.Alpha = alpha * 3;
// if confidence of barcode recognition is no less than "95"
if (barcodeInfo.Confidence >= 95)
{
paint.Color = Color.Orange;
}
// draw barcode reference points
DrawBarcodeReferencePoints(canvas, barcodeInfo, paint);
// if need draw barcode type
if (barcodeInfo.BarcodeInfoClass == BarcodeInfoClass.Barcode2D || barcodeInfo.Confidence == -1 || barcodeInfo.Confidence >= 95)
{
// get barcode type name
string text = Utils.GetBarcodeTypeString(barcodeInfo);
// draw barcode type name
DrawText(canvas, barcodeInfo.Region.Rectangle, text, _textSizeInPixels / scale, paint.Color, 255, true);
}
}