Offset Meaning
0 Join style
1 Start cap
2 End cap
3 reserved, must be 0
4 mitre limit, in form &ffff.ffff (the same form as a draw transform unit); if the distance projected by mitres would be greater than this proportion of the line width then it will be bevelled
8,9 Additional width of start triangular cap, in 1/256 of line width
10,11 Extension of start cap from line, in 1/256 of line width
12,13 Additional width of end triangular cap, in 1/256 of line width
14,15 Extension of end cap from line, in 1/256 of line width
If mitres and triangles are not used then the block may be 4 bytes long.
If mitres are used but triangles are not, then the block may be 8 bytes long.
Regrettably triangles cannot be used on thin lines. (It would have been possible to use absolute widths and length on thin paths. Alas, this is not so).
Join style
Value Meaning
0 Mitred (edges continue until they meet)
1 Round (a curve from edge to edge)
2 Bevelled (a line from edge to edge)
Cap ends style
Value Meaning
0 Butt (a line from edge to edge)
1 Round (a curve from edge to edge)
2 Squares (a square projects from the end)
3 Triangle (forming an arrow or similar)
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