How are events color coded?
The calendar colors events based on the contents of a field of your choosing. We call this field the event "status" in the documentation and sample file, but you can use any field you'd like.
Setting up color coding begins on the Source No X layout (Source No 1, Source No 2, etc.) you made when integrating the calendar. That layout has a tab called "colors" on which you can specify the field you'd like to use for color coding.
Then, on the Settings tab of the calendar you'll see a button called "assign colors". Click that and you can drag a color into each one of your "status" values.
A few notes about how this works...
Can I color code by Source instead of by a field?
Yes. If you aren't using the "Status" field in your source table(s), change it to a calc field that returns the name of the source (e.g., "Sample Events"). Make sure the result type for the calc is Text. If you are using the Status field, make a different calc field for the source, then just map the field object on the "Colors" tab on the "Source No X" layouts to that new field.
Can I color by a field outside the Event, like the Event's Project's Status?
Yes, but only if you create a calc in the events table that reflects this value from the related record (the project in this example). All the fields on the Source No X layout need to come from the table that layout is based on--not from related tables.
Can I use the triangle of color from the Simple Day View on other views?
Yes. The simple day view (go to Settings / click "Use simple...") uses a different display for colors so that the color doesn't fill the whole event.
If you want to use this display on other views, edit the calc CalendarColorReptCalc in the calendar rows table. The second line of this calc sets "objecto" to use our triangle display only when the mode is "Day" (our simple day mode). Edit this line to use the triangle in any other modes you'd like. For your reference, a list of possible modes can be found here.
You may also want to change the font size of the value "display" at the end of this calc just on the week and month views if you switch them to the triangle display. You'll see an example line there commented out which does this for you.
Here are some tips to make sure color coding works as you expect.
(Note that colors were fundamentally reworked in version 7.23 and are much more stable now as they don't depend on fonts, check out the version history notes for instructions on upgrading to the new build.)