DynaPDF Manual - Page 702

Function Reference
Page 702 of 777
SetLineDashPattern (obsolete)
Syntax:
LBOOL pdfSetLineDashPattern(
const PPDF* IPDF, // Instance pointer
const char* Dash, // Dash array defined as string
SI32 Phase)
// The pattern's phase
Return values:
If the function succeeds the return value is 1. If the function fails the return value is 0.
SetLineDashPattern2
Syntax:
LBOOL pdfSetLineDashPattern2(
const PPDF* IPDF,
// Instance pointer
const float* Dash, // Dash array defined
float Phase)
// The pattern's phase
The line dash pattern controls the pattern of dashes and gaps used to stroke paths. It is specified by a
dash array and a dash phase. The dash array’s elements are numbers that specify the lengths of
alternating dashes and gaps; the dash phase specifies the distance into the dash pattern at which to
start the dash. The elements of both the dash array and the dash phase are expressed in user space
units. Before beginning to stroke a path, the dash array is cycled through, adding up the lengths of
dashes and gaps. When the accumulated length equals the value specified by the dash phase,
stroking of the path begins, using the dash array cyclically from that point onward. The table shows
examples of line dash patterns. As can be seen from the table, an empty dash array and zero phase
can be used to restore the dash pattern to a solid line (you can also use ResetLineDashPattern()).
Dash & Phase Appearance
Description
(NULL, 0)
No dash; solid, unbroken lines
("3", 0)
3 units on, 3 units off…
("2", 1)
1 on, 2 off, 2 on, 2 off, …
("2 1", 0)
2 on, 1 off, 2 on, 1 off, …
("3 5", 6)
2 off, 3 on, 5 off, 3 on, 5 off, ...
("2 3", 11)
1 on, 3 off, 2 on, 3 off, 2 on, ...
Dashed lines wrap around curves and corners just as solid stroked lines do. The ends of each dash
are treated with the current line cap style, and corners within dashes are treated with the current line
join style. A stroking operation takes no measures to coordinate the dash pattern with features of the
path; it simply dispenses dashes and gaps along the path in the pattern defined by the dash array.
When a path consisting of several sub paths is stroked, each sub path is treated independently - that

Previous topic: SetLineCapStyle