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defined along Dr. Geo code. It comes with zero, one or several arguments, from types selected when defining the script. When an instance of a script is plugged in a canvas, the user first selects its arguments in the canvas with mouse clicks, then the position in the canvas of the script output. The
487:
Dr. Geo
Smalltalk sketches are sketches entirely defined in the Smalltalk language. This is not about constructing a sketch with the Dr. Geo graphical interface, but about describing a sketch with the Smalltalk language. A programming interface with an easy and light syntax is provided.
548:
399:
Dr. Geo is shipped with its source code and the developer tools. Therefore its code can be edited and recompiled from Dr. Geo while it is functioning. This design, inherited from
Smalltalk, makes easy to test new ideas and new designs.
388:
Access to user programming is at the essence of Dr. Geo: from the software, the user can directly read, study, modify and redistribute modified version of Dr. Geo. Additionally, scripting embedded in sketch is proposed.
396:. It is also the language used for user programming: to extend Dr. Geo with arbitrary computing operations (Smalltalk script) and to define a geometric sketch entirely with programming instructions (Smalltalk sketch).
318:
Other curvilinear objects include circles (defined by 2 points, a center and segment or a radius), arcs (defined by three points or center and angle), polygons (regular or not, defined by end points), and
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To access objects in the canvas: model (MathItem) or their view (Costume) for arbitrary uses and modifications. For example to modify the color of an object given the result to a computation.
471:
creates a numeric object, whose value is the square of its first and unique argument of type number object. Whenever the first number is changed, the script returned value changes too.
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script is updated at each canvas computation. Scripts can be used in cascade, with one as the argument of another one. Script are designed to be used in two different ways:
2117:
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From the script, the arguments model are reached with the messages #arg1, #arg2, etc. The arguments view are reached with the messages #costume1, #costume2, etc.
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To output an object (i.e. a numeric value) and to show its result in the canvas. This result can be used when building subsequent objects (geometric or script).
276:
Dr. Geo has several kinds of points: a free point, which can be moved with the mouse (but may be attached to a curve) and a point given by its coordinates.
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361:
Dr. Geo comes with macro-construction: a way to teach Dr. Geo new constructions. It allows to add new objects to Dr. Geo: new transformations like
2277:
2257:
217:
is an interactive geometry software that allows its users to design & manipulate interactive geometric sketches, including dynamic models of
1963:
1944:
2262:
525:. Such sketch can be debugged and executed step-by-step. Its code is saved, as any source code, to an external text file encoded with
268:
Dr. Geo manipulates different kinds of objects such as points, lines, circles, vector, values, geometric transformations, scripts.
507:
365:, tedious constructions involving a lot of intermediate objects or constructions involving script (also named macro-script).
376:, it is possible to create a complex construction deducing the final objects from the user-given initial objects. This is a
443:
The computation of the script is done in its #compute method. For example, to calculate the square of a number, la méthode
2272:
1968:
234:
233:
graphic system (which means that it runs on Linux, Mac OS, Windows, Android). Dr. Geo was initially developed in C++ with
174:
2155:
1935:
Smalltalk sketch can be coded in native languages, currently in French and
Spanish. More native languages can be added.
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Smalltalk sktech can be used to design interactive sketch illustrating a numerical analysis method. Here the
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2188:[Dr. Geo, a doctor that can make a surgery by himself] (in French). revue.sesamath.net
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498:. When a sketch is described with Smalltalk code, all the features of the language are used:
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programmed with geometric transformations (rotation, translation and homothety). The points
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221:. It is free software (source code, translations, icons and installer are released under
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itself is a high level language, carefully crafted iteratively for about 10 years at
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2094:"The Impact of a One Laptop per Child Program on Learning: Evidence from Uruguay"
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1280:"f1: term Fn-1, f2: term Fn, o & c: origin and center of spiral arm
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Dr. Geo can apply to a point or a line one of these transformations:
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1990:"Drawing the Parabolic Trajectory of an Object under Gravity"
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Besides the parallel and perpendicular line through a point.
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license), created by
Hilaire Fernandes, it is part of the
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to get a slightly different sketch at each execution.
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Curve and its tangent computed with
Smalltalk scripts
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71:
49:
39:
2186:"Dr. Geo, un docteur qui peut s'opérer tout seul"
521:A Smalltalk sketch is edited and tested with the
2154:J.R. Fernández GarcĂa; C. Schnober (June 2006).
974:of the resulting interactive sketch are mobile.
544:recursively. Its red external summit is mobile.
2156:"Interactive geometry with Dr. Geo MATH HELPER"
2059:V. Freudenberg, Y. Ohshima, S. Wallace (2009).
1605:Computed interactive Newton-Raphson algorithm
8:
2116:: CS1 maint: multiple names: authors list (
2077:: CS1 maint: multiple names: authors list (
16:
451:"returns the square of a number"
119:
15:
2218:Video demonstration on programmed sketch
2092:G. Melo, A. Machado, A. Miranda (2014).
2038:"Geometria e programmazione con Dr. Geo"
551:Computed interactive Sierpinski triangle
2133:"Get started with Dr. Geo for geometry"
1980:
237:scripting, then in various versions of
2109:
2070:
1964:Compass-and-straightedge construction
981:Computed interactive Fibonacci spiral
380:, a graph of interdependent objects.
299:Dr. Geo is equipped with the classic
7:
1283:e: extremity of the spiral arm"
2268:Free interactive geometry software
2207:Video tutorial on Smalltalk script
2015:"Dr. Geo e la Geometria Tolemaica"
279:Points can also be created as the
14:
1945:ESUG Innovation Technology Awards
372:depend on other objects, called
31:
22:
2036:A. Centomo, F. Campora (2002).
2278:Software using the GPL license
2258:Educational software for Linux
2061:Etoys for One Laptop Per Child
990:canvas shape alfa fibo a b m s
529:, to support native language.
1:
1969:Interactive geometry software
175:Interactive geometry software
78:24.06 / June 11, 2024
247:Etoys_(programming_language)
2229:H. Fernandes (March 2016).
1659:"Derivate number"
500:object oriented programming
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368:When some objects, called
2263:Free educational software
1951:AFUL Free Software Awards
540:Here is how to program a
496:Palo Alto Research Center
93:
67:
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1598:in a 5 steps iteration.
1596:Newton-Raphson algorithm
1590:Newton-Raphson algorithm
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229:project. It runs over a
523:Smalltalk sketch editor
483:Smalltalk sketch editor
392:Dr. Geo source code is
1614:sketch f df xn ptA ptB
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283:of 2 curves or as the
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53:December 31, 1996
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2273:GNU Project software
251:One Laptop per Child
2131:C. Whittum (2016).
2013:A. Centomo (2003).
542:Sierpinski triangle
536:Sierpinski triangle
436:Live script editing
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2231:"Fibonacci spiral"
2184:A. Busser (2011).
1988:C.K. Hung (2016).
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378:macro-construction
357:Macro-construction
41:Original author(s)
2067:. pp. 57–67.
1947:(Amsterdam, 2008)
1727:'Drag me'
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