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<title>MathGL 2.1.2: B.3 JSON format</title>

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<a name="JSON-format"></a>
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<a name="JSON-format-1"></a>
<h2 class="section">B.3 JSON format</h2>

<p>MathGL can save points and primitives of 3D object. It contain a set of variables listed below.
</p>
<dl compact="compact">
<dt> &lsquo;<samp>width</samp>&rsquo;</dt>
<dd><p>width of the image;
</p></dd>
<dt> &lsquo;<samp>height</samp>&rsquo;</dt>
<dd><p>height of the image
</p></dd>
<dt> &lsquo;<samp>depth</samp>&rsquo;</dt>
<dd><p>depth of the image, usually =sqrt(width*height);
</p>
</dd>
<dt> &lsquo;<samp>npnts</samp>&rsquo;</dt>
<dd><p>number of points (vertexes);
</p></dd>
<dt> &lsquo;<samp>pnts</samp>&rsquo;</dt>
<dd><p>array of coordinates of points (vertexes), each element is array in form [x, y, z];
</p>
</dd>
<dt> &lsquo;<samp>nprim</samp>&rsquo;</dt>
<dd><p>number of primitives;
</p></dd>
<dt> &lsquo;<samp>prim</samp>&rsquo;</dt>
<dd><p>array of primitives, each element is array in form [type, n1, n2, n3, n4, id, s, w, p, z, color]. 
</p>
<p>Here <var>type</var> is kind of primitive (0 - mark, 1 - line, 2 - triangle, 3 - quadrangle, 4 - glyph), <var>n1</var>...<var>n4</var> is index of point for vertexes and <var>n2</var> can be index of glyph coordinate, <var>s</var> and <var>w</var> are size and width if applicable, <var>z</var> is average z-coordinate, <var>id</var> is primitive identification number, <var>p</var> is scaling factor for glyphs.
</p>
</dd>
<dt> &lsquo;<samp>ncoor</samp>&rsquo;</dt>
<dd><p>number of glyph positions
</p></dd>
<dt> &lsquo;<samp>coor</samp>&rsquo;</dt>
<dd><p>array of glyph positions, each element is array in form [dx,dy]
</p>
</dd>
<dt> &lsquo;<samp>nglfs</samp>&rsquo;</dt>
<dd><p>number of glyph descriptions
</p></dd>
<dt> &lsquo;<samp>glfs</samp>&rsquo;</dt>
<dd><p>array of glyph descriptions, each element is array in form [nT, nL, [xA0, yA0, xB0, yB0, xC0, yC0, xA1, yA1, xB1, yB1, xC1, yC1 ...], [xP0, yP0, xP1, yP1 ...]]. Here nT is the number of triangles; nL is the number of line vertexes; xA, yA, xB, yB, xC, yC are coordinates of triangles; and xP, yP, xQ, yQ are coordinates of lines. Line coordinate xP=0x3fff, yP=0x3fff denote line breaking.
</p>
</dd>
</dl>


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