Render label requests are coming from the next sources

  - Customer rendering of preview (saved in temporary file as it is impossible to identify customer berofe order issued. Temporary files are cleared by system)
  - When order is processed, customer and webmaster emails image attachements are used. Additionally each order label could be retrieved as URL with a special unique label marker

==== Background actions for rendering ====



Rendering of image is based on 'layers' abstraction. There are several type of layers - some applied to the whole picture, some render small object like text inside container, or image.


  - color or backgroundColor layers fill either background or all label objects with certain color
  - backgroundImage layer sets certain image as background
  - size layer allows to setup canvas size used
  - motif layer allows to setup an image inside the label. Specific top margin could be setup for motif layer
  - text layers allows to add different text blocks to label. The algorythm includes the such steps as: 
      - definition of font type
      - setting up an initial free area of the text container
      - definition of font size to be used (based on available free space)
      - re-calculation of text container sizes (if there are several lines)
      - definition of horizontal offset for the certain block (if there are several lines)
      - setup correct vertical gaps (if there are several lines)