Shapes Construction
The shapes group is used to create and draw shapes,constructions such as axis, intersections, lines and so on.
There are six possible features, each with a guide will prompt on right hand of the screen. Points, lines and circles specified on the guides are both primitive or shapes already create on the 2DVisualizer.
 Rectangles:
Instruction step by step:
1) 

Set one point 
set a second point 
confirm to construct a rectangle passing through them 

2) 

Set one point

set a second point 
set a third point 
confirm to construct a rectangle passing through them 
3) 

Select a line

set one point

Select another point

confirm to construct a rectangle with the first point as centre, the second point as vertex and one side parallel to the line

 Circles:
Instruction step by step:
1) 

Set one point 
set a second point 
confirm to construct a circle with the first point as a centre and passing through them 

2) 

Set one point 
set a second point 
confirm to construct a circle passing through them 

3) 

Set one point 
set a second point 
set a third point 
confirm to construct a circle passing through them 
4) 

Set one point 
set a second point 
set four or more points 
confirm to construct a circle passing through them 
 Arcs:
Instruction step by step:
1) 

Set one point 
set a second point 
set a third point 
confirm to construct an arc passing through them 
2) 

Set one point 
set a second point 
set a third point 
confirm to construct an arc with the first point as a centre and passing through the other two. The construction is done drawing the line clockwisely from the second point to the third. 
 Lines:
Instruction step by step:
1) 

Select one line 
Select another line 
Confirm to construct the bisector of the angle between them 
2) 

Select a circle 
Confirm to construct the two orthogonal diameters parallel to the axes 
3) 

Select an arc 
Confirm to construct the two orthogonal diameters parallel to the axes 
4) 

Select a point 
Select another point 
Confirm to construct a line connecting them 
5) 

Select a line 
Set one point 
Confirm to construct the parallel of the line passing through the point 
The parallel just built is not bounded to the point, the offset can be set manually from the property bar 
6) 

Select a line 
Set one point 
Confirm to construct the parallel of the line passing through the point, bounded to it 
7) 

Select a line 
Set one point 
Confirm to construct a line passing through the point, by default the angle is 0 
The angle can be set manually from the property bar 
8) 

Select a line 
Set one point 
Confirm to construct the orthogonal of the line passing through the point 
 New Ucs (User coordinate system) Reference:
Instruction step by step:
1) 

Set a point 
Confirm to set a new Ucs centred in the point 
2) 

Select a line 
Confirm to set a new Ucs centred in the point, having as x axes the parallel of the line 
 Points:
1)
Instruction step by step:
2) 

set a point 
Confirm to make it as a part of the object 
3) 

set a point 
set another point 
Confirm to obtain the midpoint 
4) 

set a point 
set another point 
Confirm to obtain the vertex of the rectangle built taking the two points as opposite vertexes 
5) 

Select a line 
Select another line 
Confirm to obtain the intersection point (also in the extensions) 
6) 

Select a line 
Select a circle 
Confirm to obtain the intersection point(s) 
7) 

Select an arc 
Select a line 
confirm to obtain the intersection point(s) (also in the extensions) 
8) 

Select one circle 
Select another circle 
Confirm to obtain the intersection point(s) 
9) 

Select an arc 
Select another arc 
Confirm to obtain the intersection point(s) (also in the extensions) 
10) 

Select a circle 
Select an arc 
Confirm to obtain the intersection point(s) (also in the extensions) 
When you select a shapes, a guide will prompt in order to suggest you what you can do.
Click on the visualizer to start creating shapes, press ESC to exit.