The drawing primitives have the following format:
Text: X,Y,size,text
Rect: X,Y,width,height
FillRect: X,Y,width,height
Circle: X,Y,radius
FillCircle: X,Y,radius
Line: X1,Y1,X2,Y2
QRcode: X,Y,pointWidth,text
Image: X,Y,width,height,dither,url
Icon: X,Y,height,name
RFID: em,mfc_id_hex,uid_hex

You can change the initial (X,Y) coordinates of selected objects by dragging on the canvas.
Local PNG files can be added with drag and drop.