{"id":80,"date":"2012-10-27T23:42:55","date_gmt":"2012-10-27T23:42:55","guid":{"rendered":"https:\/\/www.taumeta.org\/?p=80"},"modified":"2012-10-28T01:02:15","modified_gmt":"2012-10-28T01:02:15","slug":"basics-variables-in-tmtp","status":"publish","type":"post","link":"https:\/\/www.taumeta.org\/?p=80","title":{"rendered":"Basics: Variables in TMTP"},"content":{"rendered":"

\"\"<\/a>The basic data object in TMTP is the point.<\/p>\n

A point is a python object with these three attributes:
\nx<\/strong> \u00a0 \u00a0 \u00a0 : the x coordinate of the point
\ny<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : the y coordinate of the point
\nname<\/strong>: the name of the point<\/p>\n

The names are very simplified, because there can be over 100 points in a complex pattern piece. Points are named using it’s pattern piece letter. The first point to be drawn on\u00a0 pattern piece D<\/strong> should be named ‘da<\/strong>‘.<\/p>\n

There are two types of drawn points in TMTP:
\npattern points\u00a0\u00a0\u00a0\u00a0 : solid red circles, created with rPointP()<\/strong> or rPoint()<\/strong> functions.
\ncontrol points\u00a0\u00a0\u00a0\u00a0 : gray outlined circles, created with cPointP()<\/strong> or cPoint()<\/strong> functions.
\nPattern points mark normal pattern points.
\nControl points mark the handles of pattern curves.<\/p>\n

Here is TMTP code to create points da<\/strong> at the origin and db <\/strong>at 3 inches right and 4 inches down from da<\/strong> on pattern piece D<\/strong>:
\nda = rPoint(D, ‘da’, 0.0, 0.0)<\/strong>
\ndb = rPoint(D, ‘db’, da.x + 3.0*IN, da.y + 4*IN)<\/strong><\/p>\n

To calculate control points for a curve from da to db:
\ndb.c1 = cPointP(D, ‘db.c1’, <point at angle and length from da<\/strong>>)<\/strong>
\ndb.c2 = cPointP(D, ‘db.c2’, <point at angle and length from db<\/strong>>)<\/strong>
\nmore on how to calculate control points in another tutorial<\/em>\u00a0 –\u00a0 they’re usually created at an angle from one of the two endpoints.<\/em>
\n<\/strong><\/p>\n

<\/strong> IN<\/strong> converts inches to pixels, and CM<\/strong> converts centimeters to pixels. TMTP uses Inkscape’s base measurement ratio, 90 pixels per inch<\/em><\/strong>. Look in the tmtp\/standalone\/tmtpl\/constants.py file to see all the TMTP global variables.<\/p>\n

Python Programming Notes:
\nThe numbers used with IN and CM can be integers or have decimal values. The result will be the same. When using fractions, ratios, or dividing, as in (5\/8.0)*IN, the divisor *must* have a decimal or python may round down to the nearest integer.<\/em>\u00a0<\/em><\/p>\n

Some points do not need to create an SVG circle.\u00a0 You might need to create a point to help calculate a pattern or control point:
\n temp_pnt = Pnt(db.x, da.y)
\n<\/strong><\/strong>The Pnt() function creates a python object of the Pnt base<\/em> class<\/em>. Pattern and control points are created with the Point() base class\u00a0<\/strong>which has attributes and methods to enable the point to be drawn to the SVG canvas, transformed, etc.<\/p>\n

Here’s an example of some of pattern point da’s\u00a0<\/strong>attributes, on pattern piece D, <\/strong>with coordinates (15, 20):
\nda.x<\/strong>\u00a0\u00a0 = 15.0
\n da.y<\/strong>\u00a0\u00a0 = 20.0
\nda.name<\/strong> = ‘da’
\nda.id<\/strong> = ‘D.da’
\nda.coords<\/strong> = ‘15.0, 20.0’
\n<\/em><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

The basic data object in TMTP is the point. A point is a python object with these three attributes: x \u00a0 \u00a0 \u00a0 : the x coordinate of the point y\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : the y coordinate of the point name: the name of the point The names are very simplified, because there can be over 100 […]<\/p>\n","protected":false},"author":41,"featured_media":88,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[14],"tags":[15],"class_list":["post-80","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-code"],"jetpack_featured_media_url":"https:\/\/www.taumeta.org\/wp-content\/uploads\/2012\/10\/Points.png","jetpack_shortlink":"https:\/\/wp.me\/p3clcA-1i","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/posts\/80","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/users\/41"}],"replies":[{"embeddable":true,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=80"}],"version-history":[{"count":10,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/posts\/80\/revisions"}],"predecessor-version":[{"id":102,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/posts\/80\/revisions\/102"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=\/wp\/v2\/media\/88"}],"wp:attachment":[{"href":"https:\/\/www.taumeta.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=80"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=80"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.taumeta.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}