75 lines
4.9 KiB
XML
75 lines
4.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
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<name>Construct from Triangle</name>
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<id>effect.draw_from_triangle</id>
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<param name="tab" type="notebook">
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<page name="common1" gui-text="Common Objects">
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<param name="circumcircle" type="bool" gui-text="Circumcircle">false</param>
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<param name="circumcentre" type="bool" gui-text="Circumcentre">false</param>
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<param name="incircle" type="bool" gui-text="Incircle">false</param>
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<param name="incentre" type="bool" gui-text="Incentre">false</param>
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<param name="contact_tri" type="bool" gui-text="Contact Triangle">false</param>
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<param name="excircles" type="bool" gui-text="Excircles">false</param>
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<param name="excentres" type="bool" gui-text="Excentres">false</param>
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<param name="extouch_tri" type="bool" gui-text="Extouch Triangle">false</param>
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<param name="excentral_tri" type="bool" gui-text="Excentral Triangle">false</param>
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<param name="orthocentre" type="bool" gui-text="Orthocentre">false</param>
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<param name="orthic_tri" type="bool" gui-text="Orthic Triangle">false</param>
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<param name="altitudes" type="bool" gui-text="Altitudes">false</param>
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<param name="anglebisectors" type="bool" gui-text="Angle Bisectors">false</param>
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<param name="centroid" type="bool" gui-text="Centroid">false</param>
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<param name="ninepointcentre" type="bool" gui-text="Nine-Point Centre">false</param>
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<param name="ninepointcircle" type="bool" gui-text="Nine-Point Circle">false</param>
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<param name="symmedians" type="bool" gui-text="Symmedians">false</param>
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<param name="sym_point" type="bool" gui-text="Symmedian Point">false</param>
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<param name="sym_tri" type="bool" gui-text="Symmedial Triangle">false</param>
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<param name="gergonne_pt" type="bool" gui-text="Gergonne Point">false</param>
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<param name="nagel_pt" type="bool" gui-text="Nagel Point">false</param>
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</page>
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<page name="Custom" gui-text="Custom Points and Options">
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<param name="mode" type="optiongroup" appearance="combo" gui-text="Custom Point Specified By:">
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<option value="trilin">Trilinear Coordinates</option>
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<option value="tcf">Triangle Function</option>
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</param>
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<param name="cust_str" type="string" gui-text="Point At:">cos(a_a):cos(a_b):cos(a_c)</param>
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<param name="cust_pt" type="bool" gui-text="Draw Marker At This Point">false</param>
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<param name="cust_radius" type="bool" gui-text="Draw Circle Around This Point">false</param>
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<param name="radius" type="string" gui-text="Radius (px):">s_a*s_b*s_c/(4*area)</param>
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<param name="isogonal_conj" type="bool" gui-text="Draw Isogonal Conjugate">false</param>
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<param name="isotomic_conj" type="bool" gui-text="Draw Isotomic Conjugate">false</param>
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</page>
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<page name="Help" gui-text="Help">
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<label 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.
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All units are the Inkscape's pixel unit. Angles are all in radians.
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You can specify a point by trilinear coordinates or by a triangle centre function.
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Enter as functions of the side length or angles.
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Trilinear elements should be separated by a colon: ':'.
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Side lengths are represented as 's_a', 's_b' and 's_c'.
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Angles corresponding to these are 'a_a', 'a_b', and 'a_c'.
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You can also use the semi-perimeter and area of the triangle as constants. Write 'area' or 'semiperim' for these.
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You can use any standard Python math function:
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ceil(x); fabs(x); floor(x); fmod(x,y); frexp(x); ldexp(x,i);
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modf(x); exp(x); log(x [, base]); log10(x); pow(x,y); sqrt(x);
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acos(x); asin(x); atan(x); atan2(y,x); hypot(x,y);
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cos(x); sin(x); tan(x); degrees(x); radians(x);
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cosh(x); sinh(x); tanh(x)
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Also available are the inverse trigonometric functions:
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sec(x); csc(x); cot(x)
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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.
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</label>
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</page>
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</param>
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<effect>
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<object-type>all</object-type>
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<effects-menu>
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<submenu name="Generate from Path"/>
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</effects-menu>
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</effect>
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<script>
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<command location="inx" interpreter="python">construct_from_triangle.py</command>
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</script>
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</inkscape-extension>
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