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cpdf_setmiterlimit
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cpdf_setmiterlimit

Name

cpdf_setmiterlimit — Sets miter limit

Synopsis

bool cpdf_setmiterlimit(pdfdoc, value); resource pdfdoc: PDF document identifier double value: Miter type

Returns

TRUE on success or FALSE on error

Description

When the join in cpdf_setlinejoin() is set to 0 (a miter join), the joining of two lines at a steep angle can result in a large peak which may look unattractive. Using cpdf_setmiterlimit() , the ratio of line width to mitre length is calculated and if the result exceeds the mitre limit then the join type is automatically changed to a bevel.

Version

Since versions 3.0.8 and 4.0

Example

Example 174. Control miter limit

// start a PDF document
$cpdf = cpdf_open(0, "test.pdf");

// create a 600x400 page
cpdf_page_init($cpdf, 1, 0, 600, 400, 1);

// set line width to show effect
cpdf_setlinewidth($cpdf,5);

// set a miter join
cpdf_setlinejoin($cpdf, 0);

// draw line
cpdf_moveto($cpdf, 200, 600);
cpdf_lineto($cpdf, 250, 500);
cpdf_lineto($cpdf, 300, 600);
cpdf_stroke($cpdf);

// thicken line
cpdf_setlinewidth($cpdf,10);

// alter the miter limit 
cpdf_setmiterlimit($cpdf, 2);

// trigger a miter to bevel change
cpdf_setlinejoin($cpdf, 0);
cpdf_moveto($cpdf, 200, 500);
cpdf_lineto($cpdf, 250, 400);
cpdf_lineto($cpdf, 300, 500);
cpdf_stroke($cpdf);

// close and write document
cpdf_finalize($cpdf);
cpdf_close($cpdf);

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