forked from minhngoc25a/freetype2
Revising, formatting.
This commit is contained in:
Werner Lemberg
parent
733b2f8b0a
commit
2bc7c45b5f
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@ -6,32 +6,53 @@
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content="text/html; charset=iso-8859-1">
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<meta name="Author"
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content="David Turner">
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<title>The Design of FreeType 2 - Introduction</title>
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<title>The design of FreeType 2</title>
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</head>
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<body text="#000000"
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bgcolor="#ffffff">
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bgcolor="#FFFFFF"
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link="#0000EF"
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vlink="#51188E"
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alink="#FF0000">
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<h1 align=center>
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The Design of FreeType 2
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The design of FreeType 2
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</h1>
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<h3 align=center>
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Copyright 1998-2000 David Turner (<a
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href="mailto:david@freetype.org">david@freetype.org</a>)<br>
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Copyright 2000 The FreeType Development Team (<a
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href="mailto:devel@freetype.org">devel@freetype.org</a>)
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</h3>
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<center>
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<table width="650">
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<table width="65%">
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<tr><td>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-2.html">Next</a>
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</td>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC"
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valign=center>
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width="30%">
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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||||
</td>
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<td align=center
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width="30%">
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<a href="design-2.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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<p><hr></p>
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<table width="100%">
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<tr bgcolor="#ccccee"><td>
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@ -108,20 +129,32 @@
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such topics as system-specific interfaces, how to write your own module
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and how to tailor library initialization & compilation to your needs.</p>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-2.html">Next</a>
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</td>
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</tr></table></center>
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<p><hr></p>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC" valign=center>
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<td align=center
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width="30%">
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</td>
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-3.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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</td></tr>
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</table>
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</center>
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</body>
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</html>
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@ -6,31 +6,53 @@
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content="text/html; charset=iso-8859-1">
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<meta name="Author"
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content="David Turner">
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<title>The Design of FreeType 2 - Basic Design</title>
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<title>The design of FreeType 2</title>
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</head>
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<body text="#000000"
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bgcolor="#ffffff">
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bgcolor="#FFFFFF"
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link="#0000EF"
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vlink="#51188E"
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alink="#FF0000">
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<h1 align=center>
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The Design of FreeType 2
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The design of FreeType 2
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</h1>
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<h3 align=center>
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Copyright 1998-2000 David Turner (<a
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href="mailto:david@freetype.org">david@freetype.org</a>)<br>
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Copyright 2000 The FreeType Development Team (<a
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href="mailto:devel@freetype.org">devel@freetype.org</a>)
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</h3>
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<center>
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<table width="650">
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<table width="65%">
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<tr><td>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-1.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-3.html">Next</a>
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</td>
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</tr></table></center>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC"
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valign=center>
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<td align=center
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width="30%">
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<a href="design-1.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-3.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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<p><hr></p>
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<table width="100%">
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<tr bgcolor="#ccccee"><td>
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@ -134,20 +156,32 @@
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</li>
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</ul>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-1.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-3.html">Next</a>
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</td>
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</tr></table></center>
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<p><hr></p>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC" valign=center>
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<td align=center
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width="30%">
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<a href="design-1.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-3.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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</td></tr>
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</table>
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</center>
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</body>
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</html>
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content="text/html; charset=iso-8859-1">
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<meta name="Author"
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content="David Turner">
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<title>The Design of FreeType 2 - Public Objects</title>
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<title>The design of FreeType 2</title>
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</head>
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<body text="#000000"
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bgcolor="#ffffff">
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bgcolor="#FFFFFF"
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link="#0000EF"
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vlink="#51188E"
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alink="#FF0000">
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<h1 align=center>
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The Design of FreeType 2
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The design of FreeType 2
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</h1>
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<h3 align=center>
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Copyright 1998-2000 David Turner (<a
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href="mailto:david@freetype.org">david@freetype.org</a>)<br>
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Copyright 2000 The FreeType Development Team (<a
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href="mailto:devel@freetype.org">devel@freetype.org</a>)
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</h3>
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<center>
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<table width="650">
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<table width="65%">
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<tr><td>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-2.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-4.html">Next</a>
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</td>
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</tr></table></center>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC"
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valign=center>
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<td align=center
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width="30%">
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<a href="design-2.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-4.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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<p><hr></p>
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<table width="100%">
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<tr bgcolor="#ccccee"><td>
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@ -300,20 +322,32 @@
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<p>Note that this picture will be updated at the end of the next
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chapter, related to <em>internal objects</em>.</p>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-2.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-4.html">Next</a>
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</td>
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</tr></table></center>
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<p><hr></p>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC" valign=center>
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<td align=center
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width="30%">
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<a href="design-2.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-4.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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</td></tr>
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</table>
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</center>
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</body>
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</html>
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content="text/html; charset=iso-8859-1">
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<meta name="Author"
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content="David Turner">
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<title>The Design of FreeType 2 - Internal Objects</title>
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<title>The design of FreeType 2</title>
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</head>
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<body text="#000000"
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bgcolor="#ffffff">
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bgcolor="#FFFFFF"
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link="#0000EF"
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vlink="#51188E"
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alink="#FF0000">
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<h1 align=center>
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The Design of FreeType 2
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The design of FreeType 2
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</h1>
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<h3 align=center>
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Copyright 1998-2000 David Turner (<a
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href="mailto:david@freetype.org">david@freetype.org</a>)<br>
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Copyright 2000 The FreeType Development Team (<a
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href="mailto:devel@freetype.org">devel@freetype.org</a>)
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</h3>
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<center>
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<table width="650">
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<table width="65%">
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<tr><td>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-3.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-5.html">Next</a>
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</td>
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</tr></table></center>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC"
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valign=center>
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<td align=center
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width="30%">
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<a href="design-3.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-5.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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<p><hr></p>
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<table width="100%">
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<tr bgcolor="#ccccee"><td>
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@ -308,20 +330,32 @@
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alt="Complete library model">
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</center>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-3.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-5.html">Next</a>
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</td>
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</tr></table></center>
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<p><hr></p>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC" valign=center>
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<td align=center
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width="30%">
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<a href="design-3.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-5.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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</td></tr>
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</table>
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</center>
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</body>
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</html>
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content="text/html; charset=iso-8859-1">
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<meta name="Author"
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content="David Turner">
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<title>FreeType 2 - Modules</title>
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<title>The design of FreeType 2</title>
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</head>
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<body text="#000000"
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bgcolor="#ffffff">
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bgcolor="#FFFFFF"
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link="#0000EF"
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vlink="#51188E"
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alink="#FF0000">
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<h1 align=center>
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The design of FreeType 2
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</h1>
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<h3 align=center>
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Copyright 1998-2000 David Turner (<a
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href="mailto:david@freetype.org">david@freetype.org</a>)<br>
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Copyright 2000 The FreeType Development Team (<a
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href="mailto:devel@freetype.org">devel@freetype.org</a>)
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</h3>
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<center>
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<table width="650">
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<table width="65%">
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<tr><td>
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<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
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<td align=center width="30%">
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<a href="design-4.html">Previous</a>
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</td>
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<td align=center width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center width="30%">
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<a href="design-6.html">Next</a>
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</td>
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</tr></table></center>
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<center>
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<table width="100%"
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border=0
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cellpadding=5>
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<tr bgcolor="#CCFFCC"
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valign=center>
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width="30%">
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<a href="design-4.html">Previous</a>
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</td>
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<td align=center
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width="30%">
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<a href="index.html">Contents</a>
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</td>
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<td align=center
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width="30%">
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<a href="design-6.html">Next</a>
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</td>
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</tr>
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</table>
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</center>
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<p><hr></p>
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<table width="100%">
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||||
<tr bgcolor="#ccccee"><td>
|
||||
|
|
@ -405,20 +427,32 @@
|
|||
<p>Helper modules use the base <tt>FT_ModuleRec</tt> type. We will
|
||||
describe these classes in the next chapters.</p>
|
||||
|
||||
<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
|
||||
<td align=center width="30%">
|
||||
<a href="design-4.html">Previous</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
<a href="design-6.html">Next</a>
|
||||
</td>
|
||||
</tr></table></center>
|
||||
<p><hr></p>
|
||||
|
||||
<center>
|
||||
<table width="100%"
|
||||
border=0
|
||||
cellpadding=5>
|
||||
<tr bgcolor="#CCFFCC" valign=center>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="design-4.html">Previous</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="design-6.html">Next</a>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</center>
|
||||
|
||||
</td></tr>
|
||||
</table>
|
||||
</center>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
|
|||
|
|
@ -6,32 +6,53 @@
|
|||
content="text/html; charset=iso-8859-1">
|
||||
<meta name="Author"
|
||||
content="David Turner">
|
||||
<title>The Design of FreeType 2 - Introduction</title>
|
||||
<title>The design of FreeType 2</title>
|
||||
</head>
|
||||
|
||||
<body text="#000000"
|
||||
bgcolor="#ffffff">
|
||||
bgcolor="#FFFFFF"
|
||||
link="#0000EF"
|
||||
vlink="#51188E"
|
||||
alink="#FF0000">
|
||||
|
||||
<h1 align=center>
|
||||
The Design of FreeType 2
|
||||
The design of FreeType 2
|
||||
</h1>
|
||||
|
||||
<h3 align=center>
|
||||
Copyright 1998-2000 David Turner (<a
|
||||
href="mailto:david@freetype.org">david@freetype.org</a>)<br>
|
||||
Copyright 2000 The FreeType Development Team (<a
|
||||
href="mailto:devel@freetype.org">devel@freetype.org</a>)
|
||||
</h3>
|
||||
|
||||
<center>
|
||||
<table width="650">
|
||||
<table width="65%">
|
||||
<tr><td>
|
||||
|
||||
<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
|
||||
<td align=center width="30%">
|
||||
<a href="design-5.html">Previous</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
|
||||
</td>
|
||||
</tr></table></center>
|
||||
<center>
|
||||
<table width="100%"
|
||||
border=0
|
||||
cellpadding=5>
|
||||
<tr bgcolor="#CCFFCC"
|
||||
valign=center>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="design-5.html">Previous</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</center>
|
||||
|
||||
<p><hr></p>
|
||||
|
||||
<table width="100%">
|
||||
<tr bgcolor="#ccccee"><td>
|
||||
|
|
@ -42,20 +63,32 @@
|
|||
</table>
|
||||
|
||||
|
||||
<center><table width="100%" border=0 cellpadding=5><tr bgcolor="#CCFFCC" valign=center>
|
||||
<td align=center width="30%">
|
||||
<a href="design-5.html">Previous</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center width="30%">
|
||||
|
||||
</td>
|
||||
</tr></table></center>
|
||||
<p><hr></p>
|
||||
|
||||
<center>
|
||||
<table width="100%"
|
||||
border=0
|
||||
cellpadding=5>
|
||||
<tr bgcolor="#CCFFCC" valign=center>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href=design-5.html">Previous</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
<a href="index.html">Contents</a>
|
||||
</td>
|
||||
<td align=center
|
||||
width="30%">
|
||||
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</center>
|
||||
|
||||
</td></tr>
|
||||
</table>
|
||||
</center>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
|
|
|
|||
|
|
@ -6,72 +6,73 @@
|
|||
content="text/html; charset=iso-8859-1">
|
||||
<meta name="Author"
|
||||
content="David Turner">
|
||||
<title>The Design of FreeType 2 - Introduction</title>
|
||||
<title>The design of FreeType 2</title>
|
||||
</head>
|
||||
|
||||
<body text="#000000"
|
||||
bgcolor="#ffffff">
|
||||
bgcolor="#FFFFFF"
|
||||
link="#0000EF"
|
||||
vlink="#51188E"
|
||||
alink="#FF0000">
|
||||
|
||||
<h1 align=center>
|
||||
The Design of FreeType 2
|
||||
The design of FreeType 2
|
||||
</h1>
|
||||
|
||||
<h3 align=center>
|
||||
Copyright 1998-2000 David Turner (<a
|
||||
href="mailto:david@freetype.org">david@freetype.org</a>)<br>
|
||||
Copyright 2000 The FreeType Development Team (<a
|
||||
href="mailto:devel@freetype.org">devel@freetype.org</a>)
|
||||
</h3>
|
||||
|
||||
|
||||
<center>
|
||||
<table width="650">
|
||||
<table width="70%">
|
||||
<tr><td>
|
||||
|
||||
<p>This document describes the details of FreeType 2's internals.
|
||||
Read this carefully if you need to understand the innards of the library
|
||||
in order to hack or extend it.</p>
|
||||
|
||||
<table width="100%">
|
||||
<tr bgcolor="#ccccee"><td>
|
||||
<h1>
|
||||
Abstract
|
||||
</h1>
|
||||
</td></tr>
|
||||
<tr valign=center
|
||||
bgcolor="#CCCCFF">
|
||||
<td align=center>
|
||||
<h2>
|
||||
Table of Contents
|
||||
</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>This document describes the details of FreeType 2's internals.
|
||||
It's a good read if you need to understand the innards of the
|
||||
library in order to hack or extend it.</p>
|
||||
<center>
|
||||
<table width="80%">
|
||||
<tr><td>
|
||||
|
||||
<h2>
|
||||
<a href="design-1.html">Introduction</a>
|
||||
</h2>
|
||||
|
||||
<h2>
|
||||
<a href="design-2.html">I. Components and APIs</a>
|
||||
</h2>
|
||||
|
||||
<h2>
|
||||
<a href="design-3.html">II. Public Objects and Classes</a>
|
||||
</h2>
|
||||
|
||||
<h2>
|
||||
<a href="design-4.html">III. Internal Objects and Classes</a>
|
||||
</h2>
|
||||
|
||||
<h2>
|
||||
<a href="design-5.html">IV. Module Classes</a>
|
||||
</h2>
|
||||
|
||||
<table width="100%">
|
||||
<tr bgcolor="#ccccee"><td>
|
||||
<h1>
|
||||
Table of Contents
|
||||
</h1>
|
||||
</td></tr>
|
||||
</table>
|
||||
|
||||
|
||||
<center><table width="60%"><tr><td>
|
||||
|
||||
|
||||
<a href="design-1.html">
|
||||
<h2>Introduction</h2>
|
||||
</a>
|
||||
|
||||
|
||||
<a href="design-2.html">
|
||||
<h2>I. Components and APIs:</h2>
|
||||
</a>
|
||||
|
||||
|
||||
<a href="design-3.html">
|
||||
<h2>II. Public Objects and Classes:</h2>
|
||||
</a>
|
||||
|
||||
|
||||
<a href="design-4.html">
|
||||
<h2>III. Internal Objects and Classes:</h2>
|
||||
</a>
|
||||
|
||||
|
||||
<a href="design-5.html">
|
||||
<h2>IV. Module Classes:</h2>
|
||||
</a>
|
||||
|
||||
</td></tr></table></center>
|
||||
</center>
|
||||
|
||||
</td></tr>
|
||||
</table>
|
||||
|
|
|
|||
|
|
@ -88,7 +88,7 @@
|
|||
context. For example, most users of word-processors use "font" to
|
||||
describe a font family (e.g. "Courier", "Palatino", etc.); however most
|
||||
of these families are implemented through several data files depending
|
||||
on the file format: For TrueType, this is usually one per face (i.e.
|
||||
on the file format: For TrueType, this is usually one per face (i.e.
|
||||
<tt>arial.ttf</tt> for "Arial Regular", <tt>ariali.ttf</tt> for "Arial
|
||||
Italic", etc.). The file is also called a "font" but really contains a
|
||||
font face.</p>
|
||||
|
|
@ -121,7 +121,7 @@
|
|||
script, usage or context. Several characters can also take a single
|
||||
glyph (good examples are Roman ligatures like "fi" and "fl" which can be
|
||||
represented by a single glyph). The relationships between characters
|
||||
and glyphs can be very complex, but won't be discussed in this document.
|
||||
and glyphs can be very complex, but won't be discussed in this document.
|
||||
Moreover, some formats use more or less awkward schemes to store and
|
||||
access glyphs. For the sake of clarity, we only retain the following
|
||||
notions when working with FreeType:</p>
|
||||
|
|
|
|||
|
|
@ -211,7 +211,7 @@
|
|||
|
||||
<p>The outline as stored in a font file is called the "master" outline,
|
||||
as its points coordinates are expressed in font units. Before it can be
|
||||
converted into a bitmap, it must be scaled to a given size/resolution.
|
||||
converted into a bitmap, it must be scaled to a given size/resolution.
|
||||
This is done through a very simple transformation, but always creates
|
||||
undesirable artifacts, e.g. stems of different widths or heights in
|
||||
letters like "E" or "H".</p>
|
||||
|
|
@ -235,7 +235,7 @@
|
|||
|
||||
<p>The TrueType format defines a stack-based virtual machine, for
|
||||
which programs can be written with the help of more than
|
||||
200 opcodes (most of these relating to geometrical operations).
|
||||
200 opcodes (most of these relating to geometrical operations).
|
||||
Each glyph is thus made of both an outline and a control program to
|
||||
perform the actual grid-fitting in the way defined by the font
|
||||
designer.</p>
|
||||
|
|
@ -293,7 +293,7 @@
|
|||
</td>
|
||||
|
||||
<td valign=top>
|
||||
<p><b>Quality.</b> Excellent results at small sizes are possible.
|
||||
<p><b>Quality.</b> Excellent results at small sizes are possible.
|
||||
This is very important for screen display.</p>
|
||||
|
||||
<p><b>Consistency.</b> All renderers produce the same glyph
|
||||
|
|
|
|||
|
|
@ -82,7 +82,7 @@
|
|||
|
||||
<ul>
|
||||
<li>
|
||||
<p>With horizontal layout, glyphs simply "rest" on the baseline.
|
||||
<p>With horizontal layout, glyphs simply "rest" on the baseline.
|
||||
Text is rendered by incrementing the pen position, either to the
|
||||
right or to the left.</p>
|
||||
|
||||
|
|
|
|||
|
|
@ -268,7 +268,7 @@
|
|||
4. Right-to-left layout
|
||||
</h3>
|
||||
|
||||
<p>The process of laying out Arabic or Hebrew text is extremely similar.
|
||||
<p>The process of laying out Arabic or Hebrew text is extremely similar.
|
||||
The only difference is that the pen position must be decremented before
|
||||
the glyph rendering (remember: the advance width is always positive,
|
||||
even for Arabic glyphs).</p>
|
||||
|
|
@ -412,7 +412,7 @@
|
|||
text size).</p>
|
||||
|
||||
<p>These distinct resolutions explain some differences when displaying
|
||||
text at the same character size on a Mac and a Windows machine.
|
||||
text at the same character size on a Mac and a Windows machine.
|
||||
Moreover, it is not unusual to find some TrueType fonts with enhanced
|
||||
hinting (technical note: through delta-hinting) for the sizes of 10, 12,
|
||||
14 and 16 points at 96 dpi.</p>
|
||||
|
|
|
|||
|
|
@ -84,7 +84,7 @@
|
|||
plane. Each contour is made of a series of line segments and
|
||||
Bézier arcs. Depending on the file format, these can be
|
||||
second-order or third-order polynomials. The former are also called
|
||||
quadratic or conic arcs, and they are used in the TrueType format.
|
||||
quadratic or conic arcs, and they are used in the TrueType format.
|
||||
The latter are called cubic arcs and are mostly used in the
|
||||
Type 1 format.</p>
|
||||
|
||||
|
|
|
|||
|
|
@ -98,7 +98,7 @@
|
|||
center being at location (0.5,0.5).</p>
|
||||
|
||||
<p>This introduces some differences when computing distances. For
|
||||
example, the <em>length</em> in pixels of the line [0,0]-[10,0] is 11.
|
||||
example, the <em>length</em> in pixels of the line [0,0]-[10,0] is 11.
|
||||
However, the vectorial distance between (0,0)-(10,0) covers exactly
|
||||
10 pixel centers, hence its length is 10.</p>
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue