<?xml version="1.0" encoding="UTF-8"?>

<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">

<_name>Draw From Triangle</_name>

<id>il.fromtriangle</id>

<dependency type="executable" location="extensions">draw_from_triangle.py</dependency>

<dependency type="executable" location="extensions">inkex.py</dependency>

<param name="tab" type="notebook">

<page name="common1" _gui-text="Common Objects">

<param name="circumcircle" type="boolean" _gui-text="Circumcircle"></param>

<param name="circumcentre" type="boolean" _gui-text="Circumcentre"></param>

<param name="incircle" type="boolean" _gui-text="Incircle"></param>

<param name="incentre" type="boolean" _gui-text="Incentre"></param>

<param name="contact_tri" type="boolean" _gui-text="Contact Triangle"></param>

<param name="excircles" type="boolean" _gui-text="Excircles"></param>

<param name="excentres" type="boolean" _gui-text="Excentres"></param>

<param name="extouch_tri" type="boolean" _gui-text="Extouch Triangle"></param>

<param name="excentral_tri" type="boolean" _gui-text="Excentral Triangle"></param>

<param name="orthocentre" type="boolean" _gui-text="Orthocentre"></param>

<param name="orthic_tri" type="boolean" _gui-text="Orthic Triangle"></param>

<param name="altitudes" type="boolean" _gui-text="Altitudes"></param>

<param name="anglebisectors" type="boolean" _gui-text="Angle Bisectors"></param>

<param name="centroid" type="boolean" _gui-text="Centroid"></param>

<param name="ninepointcentre" type="boolean" _gui-text="Nine-Point Centre"></param>

<param name="ninepointcircle" type="boolean" _gui-text="Nine-Point Circle"></param>

<param name="symmedians" type="boolean" _gui-text="Symmedians"></param>

<param name="sym_point" type="boolean" _gui-text="Symmedian Point"></param>

<param name="sym_tri" type="boolean" _gui-text="Symmedial Triangle"></param>

<param name="gergonne_pt" type="boolean" _gui-text="Gergonne Point"></param>

<param name="nagel_pt" type="boolean" _gui-text="Nagel Point"></param>

</page>

<page name="Custom" _gui-text="Custom Points and Options">

<param name="mode" type="enum" _gui-text="Custom Point Specified By:">

<_item value="trilin">Trilinear Coordinates</_item>

<_item value="tcf">Triangle Function</_item>

</param>

<param name="cust_str" type="string" _gui-text="Point At:">cos(a_a):cos(a_b):cos(a_c)</param>

<param name="cust_pt" type="boolean" _gui-text="Draw Marker At This Point"></param>

<param name="cust_radius" type="boolean" _gui-text="Draw Circle Around This Point"></param>

<param name="radius" type="string" _gui-text="Radius (px):">s_a*s_b*s_c/(4*area)</param>

<param name="isogonal_conj" type="boolean" _gui-text="Draw Isogonal Conjugate"></param>

<param name="isotomic_conj" type="boolean" _gui-text="Draw Isotomic Conjugate"></param>

<param name="report" type="boolean" _gui-text="Report this triangle's properties"></param>

</page>

<page name="Help" _gui-text="Help">

<_param name="instructions" type="description" xml:space="preserve">This extension draws constructions about a triangle defined by the first 3 nodes of a selected path. You may select one of preset objects or create your own ones.

All units are the Inkscape's pixel unit. Angles are all in radians.

You can specify a point by trilinear coordinates or by a triangle centre function.

Enter as functions of the side length or angles.

Trilinear elements should be separated by a colon: ':'.

Side lengths are represented as 's_a', 's_b' and 's_c'.

Angles corresponding to these are 'a_a', 'a_b', and 'a_c'.

You can also use the semi-perimeter and area of the triangle as constants. Write 'area' or 'semiperim' for these.

You can use any standard Python math function:

ceil(x); fabs(x); floor(x); fmod(x,y); frexp(x); ldexp(x,i);

modf(x); exp(x); log(x [, base]); log10(x); pow(x,y); sqrt(x);

acos(x); asin(x); atan(x); atan2(y,x); hypot(x,y);

cos(x); sin(x); tan(x); degrees(x); radians(x);

cosh(x); sinh(x); tanh(x)

Also available are the inverse trigonometric functions:

sec(x); csc(x); cot(x)

You can specify the radius of a circle around a custom point using a formula, which may also contain the side lengths, angles, etc. You can also plot the isogonal and isotomic conjugate of the point. Be aware that this may cause a divide-by-zero error for certain points.

</_param>

</page>

</param>

<effect>

<object-type>all</object-type>

<effects-menu>

<submenu _name="Render"/>

</effects-menu>

</effect>

<script>

<command reldir="extensions" interpreter="python">draw_from_triangle.py</command>

</script>

</inkscape-extension>