From OFSET Community Wiki

Contents 1 Introduction 2 Contents 2.1 Starting with Dr. Geo II 2.2 Basic tools 2.2.1 Point tools 2.2.2 Curve tools 2.2.3 Transformation tools 2.2.4 Numeric tools 2.2.5 Other tools 2.3 Advanced tools 2.3.1 Etoys viewer 2.3.2 Macro-construction 2.3.3 Smalltalk programmed figure 2.3.4 Smalltalk script 2.4 Misc examples 2.5 Morphic integration

Introduction

Proposal to realize video/screen-cast demonstrating DrGeoII and its features. In these videos, DrGeoII will be installed in the Etoys image used in the XO notebook was installed in the Pharo Smalltalk image as it was easier for me to produce the goold quality document at PAL DVD resolution. But don't worry it is the same with Etoys. If you want to collaborate on that page, just write to hilaire@ofset.org, he will create an account for you.

The video should be encoded with the maximum quality, at best with a lossless format, at a screen resolution not higher to the PAL DVD format (720x576). However it can be at a lower screen resolution.

To produce the screencast, I use recordmydesktop with the maximum video quality at 8 fps and no sound:

recordmydesktop --no-sound -windowid 0x3800002 -fps 8 -o 003-advanced-record-in-menu.ogg

With some of these screencasts we produced a video clip presenting Dr. Geo II.

Contents

To show the halo surrounding graphic elements of the user interface, depending on your plateforme you need to press the right mouse button, or combination of key like Alt+clic. Lire Squeak, un Smalltalk libre multimédia.

Starting with Dr. Geo II

• Opening a figure
• Recording in the 'Do' menu a DrGeo command to open it
• More fun recording a DrGeo command in the Do menu
• Zooming, moving an example figure
• Contextual menu from the drawing background menu
• Persisting contextual menu
• Extraction item from the contextual menu
• Halo menu
• Asking buttons to Dr. Geo

Basic tools

Point tools

• Free point, point on curve
• Intersection point
• Middle of two points
• Middle of a segment
• Point define by coordinates

Curve tools

• Line
• Ray
• Segment
• Vector
• Circle defined by two points
• Circle defined by center and radius
• Arc
• Polygon
• Locus

Transformation tools

• Parallel line
• Perpendicular line
• Central symmetry
• Axial symmetry
• Translation
• Rotation with angle in radian
• Rotation with geometric angle in degree
• Rotation with oriented angle in degree
• Scale

Numeric tools

• Distance : distance between two points, a point and a line, segment length, vector norm, arc length, circle perimeter, line slope
• Geometric angle
• Oriented angle
• Free value you can change at will

Other tools

• Undo/redo commands
• Erase
• Style on object: change aspect, edit object name, edit value. Demonstrated for the various item categories
• Griding
• Create multiple mode
• Default position and scale

Advanced tools

Etoys viewer

• Open the Point viewer
• Manipulate with the viewer a free point
• Manipulate with the viewer a free point on a curve
• EToys script to move a point
• EToys script to control a point with a joystick

Macro-construction

• Recording a macro-construction
• Playing a macro-construction

Smalltalk programmed figure

It is a progressive collection of screencasts. You should view all once in the listed order bellow.

• Demonstration of Smalltalk programmed figure
• Write a programmed triangle
• Write a programmed triangle with randomized summit
• Write programmed recursive triangles

Smalltalk script

• Write and use a script without any argument
• Write and use a script with one argument
• Write and use a script with two arguments
• Write and use a script returning a Point instance

Misc examples

Several misc examples of use can be view at ftp://ftp.ofset.org/squeak/drgeo. Beware these screencasts are based on earlier version of DrGeoII and the video quality is not as good as the previous ones.

Morphic integration

To be continued...

• Inserting text in DrGeo figure
• Inserting image in DrGeo figure
• Connecting media with connector
• Inserting DrGeo figure in book media