private void AddAdornerToWatermarkLabel(TextWatermark watermark)
{
if (watermark != null)
{
AdornerLayer layer = AdornerLayer.GetAdornerLayer(watermark.UiLabelOnImageInCanvas);
WatermarkLabelAdorner a = new WatermarkLabelAdorner(watermark.UiLabelOnImageInCanvas);
a.OnDrag += TextWatermarkDragHandler;
layer.Add(a);
}
}
private void TextWatermarkDragHandler(WatermarkLabelAdorner sender, DragOperations operation, double diffX, double diffY)
{
Label l = sender.AdornedElement as Label;
if (l == null)
{
return;
}
int i = textWatermarks.GetIndexByUiLabel(l);
if (i < 0)
{
return;
}
TextWatermark t = textWatermarks[i];
if (operation == DragOperations.Move)
{
int diffXinPercent = Convert.ToInt16((diffX / imagePreview.Width) * 100);
int diffYinPercent = Convert.ToInt16((diffY / imagePreview.Height) * 100);
t.xLocationInPercent += diffXinPercent;
t.yLocationInPercent += diffYinPercent;
}
else
if (operation == DragOperations.Rotate)
{
double ox = sender.ActualWidth * Math.Cos((t.angle) * Math.PI / 180);
double oy = sender.ActualWidth * Math.Sin((t.angle) * Math.PI / 180);
double nx = ox + diffX;
if (nx < 0)
{
if (diffY < 0)
{
t.angle = -90;
}
else
{
t.angle = 90;
}
}
else
{
double ny = oy + diffY;
double na = Math.Atan(ny / nx) * (180.0 / Math.PI);
t.angle = Convert.ToInt16(na);
}
}
}
