public virtual void Render(Cairo.Context cr, Layout layout, double x, double y, double w, double h)
{
cr.Save();
cr.Translate (x,y);
// make the background white
cr.Color = new Cairo.Color(1, 1, 1);
cr.Rectangle(0,0,w,h);
cr.Fill();
// calc some values
int lw;
string prefix = "INV-"+InventoryAbbreviation+"-";
string idString = Id.ToString("0000000000");
// basic text stuff
layout.FontDescription = FontDescription.FromString(CalcFont(Layout,layout,h));
layout.Width = (int)(w*Scale.PangoScale);
layout.Alignment = Alignment.Center;
// draw the description
int descH = 0;
if(Layout.UseDescription){
Layout descLayout = layout.Copy();
descLayout.SetText (Description);
descLayout.GetPixelSize(out lw, out descH);
layout.Ellipsize = EllipsizeMode.Middle;
layout.Justify = true;
cr.Color = new Cairo.Color(0, 0, 0);
Pango.CairoHelper.ShowLayout (cr, descLayout);
}
// draw the barcode text
int codeH = 0;
if(Layout.UseBarcodeText){
Layout codeLayout = layout.Copy();
codeLayout.SetText (prefix+idString);
codeLayout.GetPixelSize(out lw, out codeH);
cr.MoveTo(0,h-(double)codeH);
cr.Color = new Cairo.Color(0, 0, 0);
Pango.CairoHelper.ShowLayout (cr, codeLayout);
}
// draw the barcode
if(Layout.UseBarcode){
double barcodeH = h-((double)codeH+(double)descH+Layout.SpacingSize*2);
if(barcodeH>0){
IBarcode bc = new Code128();
bc.WriteString(prefix+idString);
bc.WriteEnd();
RenderBarcode(bc,cr,0,descH+Layout.SpacingSize,w,barcodeH);
}
}
cr.Restore();
}
private string CalcFont(Model.LabelLayout ll,Layout layout,double heigth)
{
// the idea of this function is, to go throuth all fontsizes
// and find an appropriate appriximation to the current screen size
// of the text.
//
// for now this is done by simply testing all sizes until
// we find one larger than the one we need and return it
// This is inefficient and could be done much.
// better with a binary Search like algorythm
int h = (int)(heigth*ll.TextSize);
int sizeH; // the heigth of the currently tried size
int lw; // not needed
int size = 0;
Layout l = layout.Copy();
l.SetText ("f"); // some text to get the height of
while(true){
++size;
l.FontDescription = FontDescription.FromString(ll.FontName+" "+size);
l.GetPixelSize(out lw, out sizeH);
// return the size
if(sizeH > h){
return ll.FontName+" "+size;
}
}
}
