private static void checkChange()
{
Windows.Foundation.Rect frame = BarcodeHelper.MWBgetScanningRect(0);
int orientation = BarcodeLib.Scanner.MWBgetDirection();
if (orientation != lastOrientation || frame.Left != lastLeft || frame.Top != lastTop || frame.Width != lastWidth || frame.Height != lastHeight)
{
updateOverlay();
}
if (lastBLinkingSpeed != blinkingSpeed)
{
removeAnimation();
addAnimation();
}
if (isBlinkingLineVisible != (lineLayer.Visibility == System.Windows.Visibility.Visible))
{
updateOverlay();
}
if (isViewportVisible != (viewportLayer.Visibility == System.Windows.Visibility.Visible))
{
updateOverlay();
}
lastOrientation = orientation;
lastLeft = (float)frame.Left;
lastTop = (float)frame.Top;
lastWidth = (float)frame.Width;
lastHeight = (float)frame.Height;
lastBLinkingSpeed = blinkingSpeed;
}
private static void updateOverlay()
{
Windows.Foundation.Rect unionRect = BarcodeHelper.MWBgetScanningRect(0);
int orientation = BarcodeLib.Scanner.MWBgetDirection();
int width = (int)currentCanvas.ActualWidth;
int height = (int)currentCanvas.ActualHeight;
if (width <= 0 || height == 0)
{
DispatcherTimer updateDelayed = new DispatcherTimer();
updateDelayed.Interval = TimeSpan.FromSeconds(0.2);
updateDelayed.Tick += delegate
{
updateOverlay();
updateDelayed.Stop();
};
updateDelayed.Start();
return;
}
int rectLeft = (int)((float)unionRect.Left * width / 100.0);
int rectTop = (int)((float)unionRect.Top * height / 100.0);
int rectWidth = (int)((float)unionRect.Width * width / 100.0);
int rectHeight = (int)((float)unionRect.Height * height / 100.0);
int rectRight = (int)((float)unionRect.Right * width / 100.0);
int rectBottom = (int)((float)unionRect.Bottom * height / 100.0);
if (isViewportVisible)
{
viewportLayer.Visibility = System.Windows.Visibility.Visible;
var bitmapviewport = new WriteableBitmap(width, height);
bitmapviewport.FillRectangle(0, 0, width, height, colorFromAlphaAndInt(viewportAlpha, 0));
int lineWidth2 = (int)(viewportLineWidth / 2.0);
bitmapviewport.FillRectangle(rectLeft - lineWidth2, rectTop - lineWidth2, rectRight + lineWidth2, rectBottom + lineWidth2, colorFromAlphaAndInt(viewportLineAlpha, viewportLineColor));
bitmapviewport.FillRectangle(rectLeft, rectTop, rectRight, rectBottom, System.Windows.Media.Color.FromArgb(0, 0, 0, 0));
viewportLayer.Source = bitmapviewport;
}
else
{
viewportLayer.Visibility = System.Windows.Visibility.Collapsed;
}
if (isBlinkingLineVisible)
{
lineLayer.Visibility = System.Windows.Visibility.Visible;
addAnimation();
if (width < height)
{
double pos1f = Math.Log(BarcodeLib.Scanner.MWB_SCANDIRECTION_HORIZONTAL) / Math.Log(2);
double pos2f = Math.Log(BarcodeLib.Scanner.MWB_SCANDIRECTION_VERTICAL) / Math.Log(2);
int pos1 = (int)(pos1f + 0.01);
int pos2 = (int)(pos2f + 0.01);
int bit1 = (orientation >> pos1) & 1; // bit at pos1
int bit2 = (orientation >> pos2) & 1; // bit at pos2
int mask = (bit2 << pos1) | (bit1 << pos2);
orientation = orientation & 0xc;
orientation = orientation | mask;
}
var bitmapLine = new WriteableBitmap(width, height);
int lineWidth2 = (int)(blinkingLineWidth / 2.0);
if (((orientation & BarcodeLib.Scanner.MWB_SCANDIRECTION_HORIZONTAL) > 0) || ((orientation & BarcodeLib.Scanner.MWB_SCANDIRECTION_OMNI) > 0))
{
bitmapLine.FillRectangle(rectLeft, rectTop + rectHeight / 2 - lineWidth2, rectRight, rectTop + rectHeight / 2 + lineWidth2, colorFromAlphaAndInt(blinkingLineAlpha, blinkingLineColor));
}
if (((orientation & BarcodeLib.Scanner.MWB_SCANDIRECTION_VERTICAL) > 0) || ((orientation & BarcodeLib.Scanner.MWB_SCANDIRECTION_OMNI) > 0))
{
bitmapLine.FillRectangle(rectLeft + rectWidth / 2 - lineWidth2, rectTop, rectLeft + rectWidth / 2 + lineWidth2, rectBottom, colorFromAlphaAndInt(blinkingLineAlpha, blinkingLineColor));
}
if ((orientation & BarcodeLib.Scanner.MWB_SCANDIRECTION_OMNI) > 0)
{
bitmapLine.DrawLine(rectLeft, rectTop, rectRight, rectBottom, colorFromAlphaAndInt(blinkingLineAlpha, blinkingLineColor));
bitmapLine.DrawLine(rectLeft, rectBottom, rectRight, rectTop, colorFromAlphaAndInt(blinkingLineAlpha, blinkingLineColor));
}
lineLayer.Source = bitmapLine;
}
else
{
lineLayer.Visibility = System.Windows.Visibility.Collapsed;
removeAnimation();
}
}