merkalt:label_image_render
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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 fill background with certain image
- 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)
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