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Graphics State
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A line width of 0 denotes the thinnest line that can be rendered at device resolution: 1 device pixel wide However, some devices cannot reproduce 1-pixel lines, and on high-resolution devices, they are nearly invisible Since the results of rendering such zero-width lines are device-dependent, their use is not recommended
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Line Cap Style
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The line cap style speci es the shape to be used at the ends of open subpaths (and dashes, if any) when they are stroked Table 44 shows the possible values
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TABLE 44 Line cap styles
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STYLE APPEARANCE DESCRIPTION
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0 1 2
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Butt cap The stroke is squared off at the endpoint of the path There is no projection beyond the end of the path Round cap A semicircular arc with a diameter equal to the line width is drawn around the endpoint and lled in Projecting square cap The stroke continues beyond the endpoint of the path for a distance equal to half the line width and is then squared off
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Line Join Style
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The line join style speci es the shape to be used at the corners of paths that are stroked Table 45 shows the possible values Join styles are signi cant only at points where consecutive segments of a path connect at an angle; segments that meet or intersect fortuitously receive no special treatment
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Miter Limit
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When two line segments meet at a sharp angle and mitered joins have been speci ed as the line join style, it is possible for the miter to extend far beyond the thickness of the line stroking the path The miter limit imposes a maximum on the ratio of the miter length to the line width (see Figure 47) When the limit is exceeded, the join is converted from a miter to a bevel
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TABLE 45 Line join styles
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Miter join The outer edges of the strokes for the two segments are extended until they meet at an angle, as in a picture frame If the segments meet at too sharp an angle (as de ned by the miter limit parameter see Miter Limit, above), a bevel join is used instead Round join A circle with a diameter equal to the line width is drawn around the point where the two segments meet and is lled in, producing a rounded corner Note: If path segments shorter than half the line width meet at a sharp angle, an unintended wrong side of the circle may appear
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Bevel join The two segments are nished with butt caps (see Line Cap Style on page 153) and the resulting notch beyond the ends of the segments is lled with a triangle
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The ratio of miter length to line width is directly related to the angle between the segments in user space by the formula miterLength 1 --------------------------- = ---------------- lineWidth sin -- 2 For example, a miter limit of 1414 converts miters to bevels for less than 90 degrees, a limit of 20 converts them for less than 60 degrees, and a limit of 100 converts them for less than approximately 115 degrees
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Miter length
Line width
FIGURE 47 Miter length
S E CTIO N 4 3
Graphics State
Line Dash Pattern
The line dash pattern controls the pattern of dashes and gaps used to stroke paths It is speci ed 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 speci es 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 speci ed by the dash phase, stroking of the path begins, using the dash array cyclically from that point onward Table 46 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