Table 14 contains the program states, the text
information appearing in the mouse pointer and the picture of the mouse pointer:
Table 14. Sub states
The program is in the state of <background>, when the
Mouse pointer is
before the background i.e. there is no body behind it, and the simulation is not
running. Here, the mouse pointer does not contain text information, only a hair
cross.
The general field in the StatusBar shows the current time:
The current time is shown in seconds as bracket in the format of
year-month-day hours:minutes:seconds. States available from the keyboard or
mouse buttons are as follows:
The program is in the state of <body>, when the
Mouse pointer is
before a body unselected (see
Selection) or unholded (see
Body holding) or unsticked
(see Stick), and the simulation is not running.
The mouse pointer and the general field of the
StatusBar contain the body
name:
States available from the keyboard or mouse buttons are as follows:
The program is in the state of <body selected, holded or sticked>,
when the
Mouse pointer is before a body
selected (see Selection),
holded (see Body
holding) or sticked (see
Stick), and the simulation is not running. The mouse pointer and the general
field of the
StatusBar contain the body name. In
<body selected, holded or sticked> state, the text of the Mouse
pointer is underlined.
This example shows a selected state:
In bracket next to the body name, the number of body selected is shown.
States available from the keyboard or mouse buttons are as follows:
The program is in the state of Select body, when the
Mouse pointer
contains no text and the Left mouse button is pressed. On pressing the
Left
mouse button, bodies selected, if any, loses their significance. Afterwards, by
moving the mouse, a square with a dash line around is displayed on the screen to
indicate the area, inside which bodies will be selected. On releasing the
Left
mouse button, this square disappears, and the state of bodies selected remains.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
The general field shows the number of bodies currently selected and the
number of all bodies.
See further the section
Selection.
The program is in the state of Select further body, when the
Mouse pointer contains no text and the
Left mouse button with the
Shift key is
pressed. Bodies selected, if any, do not loose their significance, but you can
select some new for them. By moving the mouse, a square with a dash line around
is displayed on the screen to indicate the area inside which bodies originally
unselected will be selected. Bodies originally selected do not change. On
releasing the Left mouse button, this square disappears, and the state of bodies
selected remains.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
The general field shows the number of bodies currently selected and the
number of all bodies.
See further the section
Selection.
The program is in the state of Deselect body, when the
Mouse pointer
contains no text and the Left mouse button with the Control key is pressed.
Bodies unselected, if any, do not loose their significance, but you can reduce
the number of bodies selected. By moving the mouse, a square with a dash line
around is displayed on the screen to indicate the area inside which bodies
originally selected will loose their selection. On releasing the
Left mouse
button, this square disappears, and the state of bodies selected remains.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
The general field shows the number of bodies currently selected and the
number of all bodies.
See further the section
Selection.
The program is in the state of Move body, when the
Mouse pointer is
before a body unselected, the simulation is not running, and the
Left mouse
button is pressed. By moving the mouse, the body can be moved on the screen as
well.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
In this example, current body coordinates are x = 310, y = 40 meter.
The program is in the state of Continuous move of body, when the
Mouse pointer is before a body unselected, the simulation is not running, and the
Left
mouse button with the Shift or Control key are pressed.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
In this example, current body coordinates are: x = 310, y = 40 meter.
See further the section
Continuous change to parameter/Move+.
The program is in the state of Move body selected, when the
Mouse pointer is before a body selected, the simulation is not running, and the
Left
mouse button is pressed. By moving the mouse, bodies selected can be moved on
the screen as well.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
In this instance, coordinates of the current body selected are: x = 310, y =
40 meter.
The program is in the state of Continuous move of body selected, when
the Mouse pointer is before a body selected, the simulation is not running, and
the Left mouse button with the Shift or
Control key are pressed.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
In this example, coordinates of the current body selected are: x = 310, y = 40
meter.
See further the section
Continuous change to parameter/Move select+.
The program gets in the state of Change velocity vector by selecting
the menu item Body menu/Velocity... or
Selected menu/Right panel/Velocity....
The Left mouse button pressed at anywhere in the screen area will set out an end
point for the body velocity vector. With the mouse button pressed, the velocity
vector end point will move together with the mouse pointer. From this state, you
can exit by pressing the Right mouse button.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the current body velocity is 5 m/s, the velocity vector
components in bracket: x:3, y:4 meter.
Visible vector magnitude (5000) means that
the visible magnitude of the vector is 5000 times as large as that of the real
one.
States available from the keyboard or mouse buttons are as follows:
The program can get in the state of Continuous change of velocity vector
from the state of Change velocity vector, if the
Shift or Control key and the
Left mouse button are pressed.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the current body velocity is 5 m/s, the velocity vector
components in bracket: x:3, y:4 meter.
Visible vector magnitude (5000) means that
the visible magnitude of the vector is 5000 times as large as that of the real
one.
See further the section
Continuous change to parameter/Velocity+.
The program gets in the state of Change velocity vector selected by
selecting the menu item Selected menu/Left panel/Velocity.... The
Left mouse
button pressed at anywhere in the screen area will set out an end point for the
body velocity vector. With the mouse button pressed, the velocity vector end
point will move together with the mouse pointer. The velocity vectors of the
body selected will change with the same value. From this state, you can exit by pressing the
Right mouse button.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the current body velocity is 5 m/s, the velocity vector
components in bracket: x:3, y:4 meter.
Visible vector magnitude (5000) means that
the visible magnitude of the vector is 5000 times as large as that of the real
one.
States available from the keyboard or mouse buttons are as follows:
The program gets in the state of Continuous change to velocity vector
selected from the state
Change velocity vector selected, if the
Shift or
Control keys and the Left mouse button are pressed.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the current body selected is 5 m/s, the velocity vector
components in bracket: x:3, y:4 meter.
Visible vector magnitude (5000) means that
the visible magnitude of the vector is 5000 times as large as that of the real
one.
See further the section
Continuous change to parameter/Velo select+.
To change view, the program shall be placed in the state of
View. This
may occur by the menu (Main menu/View/View... or
Background menu/View...), or by
using the ToolBar (see
Figure 14). By the view, the origin of coordinates
can be move out of the screen center, so another view of the
(practically) infinite plane can be seen on the screen.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
The general field of the status bar shows where the origins of the
coordinates are as compared to the screen center, how far it is from that. As
seen from this example “View: (-15, -10) pixel; (-18.75, -12.5) m” means that
the origin is 15 pixels, 16,75 meters left from the screen centre, and
10
pixels, 12,5 meters upward. The first number in bracket shows the x
component (a negative sign shows to the left, the positive one to the right),
and the second number shows the y component (a negative sign shows
upward, a positive one downward).
To change view, the Left mouse button shall be pressed anywhere in the
main window, then the mouse moved, and finally the Left mouse button released.
On moving the mouse, the view and the status bar will change as well.
The right-hand four status bar fields indicate that by the Shift or
Control
keys, the program will get in the state of View+, and by the
Right mouse
button, it exits from the View mode.
In View+ state, the program is able to continuously change view, even
if the mouse does not move. Thus, screen size will not limit the change of view.
The use of View+ is more detailed in the section
Continuous change to parameter/View+.
States you may achieve by buttons of the keyboard and the mouse are as
follows:
| Event |
Text |
Sub state, operation |
| Shift key |
View+ |
Continuous
change to view |
| Control key |
| Left button |
View |
|
| Right button |
Escape |
Exit the state View |
The program gets in the state of Continuous change to view from the
state Change view, if the
Shift or Control keys and the
Left mouse button are
pressed.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
See further the section
Continuous change to parameter/View+.
The Zoom can be changed on the page
System in the dialog window
Create
new system/System properties or by the
Control Panel or by the mouse. For the
latter, the program shall be placed in the state of Zoom, which may occur
in the menu (Main menu/View/Zoom... or
Background menu/Zoom...) or by the
ToolBar (see
Figure 14). By the help of zoom (generally zoom in), real
sizes are shrunk to the screen size. Simple zoom means that 1 meter in reality
corresponds to 1 pixel on the screen.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the general field of the status bar shows that zoom-out is
0.5-fold (i.e. two-fold zoom-in), so one pixel on the screen corresponds to 2
meters in reality.
To change zoom, the Left mouse button shall be pressed anywhere in the
main window, moved the mouse (vertically if possible), and finally released. On
moving the mouse button, both the zoom and the status bar will change. The zoom
is insensitive to moving the mouse horizontally and on moving upward it will
reduce (bodies apparently get farther from us), and on moving downward it will
increase (bodies apparently get nearer to us). The focus point of zooming is in
the screen center, the body staying there does not change its virtual position.
The right-hand four fields of the status bar shows that by the
Shift or
Control keys, the program will get in the state of
Zoom+, and by the
Right mouse button, it exits from the
Zoom mode.
In Zoom+ state, the program is able to continuously change zoom, even
if the mouse does not move. Thus, screen size will not limit the change of zoom,
neither.
The use of Zoom+ is more detailed in the section
Continuous change to parameter/Zoom+.
States you may achieve by buttons of the keyboard and the mouse are as
follows:
| Event |
Text |
Sub state, operation |
| Shift key |
Zoom+ |
Continuous zoom |
| Control key |
| Left button |
Zoom |
|
| Right button |
Escape |
Exit the state Zoom |
The program gets in the state of Continuous zoom, from the state of
Zoom, if the Shift or
Control key and the Left mouse button are pressed.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
See further the section
Continuous change to parameter/Zoom+.
The program gets in the state of Zoom body selected by choosing the
menu item Selected menu/Left panel/Zoom....
Enlarging (and reducing) applies to the position, velocity, mass and size of
the bodies. The body for which an operation is chosen remains in the same place
from among the bodies selected, while the place of other bodies will change. The
position, velocity, mass and size will change so that interaction between the
bodies selected is unchanged as to their path, i.e. if two bodies selected has
moved around each other, then they will do so after enlarging as well (unless
the bodies unselected cause this to change).
To change zoom, the Left mouse button shall be pressed anywhere in the
main window, the mouse moved (vertically if possible), and finally released. On
moving the mouse button, both the zoom and the status bar will change. The zoom
is insensitive to moving the mouse horizontally and on moving upward it will
reduce (bodies apparently get farther from us), and on moving downward it will
increase (bodies apparently get nearer to us). The focus point of zooming is the
body for which this operation is chosen, this body does not change its virtual
position. By pressing the Right mouse button, you can exit this state.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the zoom rate is one-fold, the diameter of the body selected
is 3 meters long.
States you may achieve by buttons of the keyboard and the mouse are as
follows:
| Event |
Text |
Sub state, operation |
| Shift key |
Zoom Sel+ |
Continuous zoom of body selected |
| Control key |
| Left button |
Zoom Sel |
|
| Right button |
Escape |
Exit the state Zoom select |
The program gets in the state of Continuous zoom of body selected from
the state of Zoom body selected, if the
Shift or Control key and the
Left mouse
button are pressed.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
See further the section
Continuous change to parameter/Zoom select+.
The program gets in the state of Change body size by choosing the menu
item Body menu/Size... or
Selected menu/Right panel/Size.... By pressing the
Left mouse button anywhere in the screen area, the body size is set out so that
the body center is unchanged, and the edge of its visible disc is set out by the
Mouse pointer, but up to a visible diameter of 100 pixels. Even if the mouse
pointer gets farther, the body size will not larger, neither. On holding down
the Left mouse button, the body size can be changed by moving the mouse, while
on releasing the mouse button, the program exits this state automatically.
If zooming is so small that the virtual body size would be larger that 100
pixels, then the program warns that the size is larger than what is seen and
queries if you still want to change the size.
Information contained in the mouse pointer and the general field of the
StatusBar is as follows:
In this example, the current body diameter is 8600000 meters long.
States you may achieve by buttons of the keyboard and the mouse are as
follows:
| Event |
Text |
Sub state, operation |
| Shift key |
|
|
| Control key |
| Left button |
| Right button |
Escape |
Exit the state Size |
The program gets in the state Create new body by using the mouse by
choosing the menu item Background menu/Add bodies... and pressing the OK
button in the dialog window Add bodies appearing. The dialog window will set the
default value to create bodies by using the mouse.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
The general field of the status bar indicates that the program is in the
state of Add and creating body 12 will follow. The two right-hand field
show that by pressing the Left mouse button, a new body will be added to the
system, and by the Right mouse button the program will exit the state of
Add.
In the state of Add¸ by pressing the Left mouse button, a new body
will appear on the screen in place of the mouse button. This new body will
appear with the default parameters contained in the dialog window Add bodies.
In the pressed state of the mouse button, the body size can be changed by moving
the mouse. By releasing the button and pressing unmoved then moving the mouse,
the body velocity vector can be changed. By releasing the button again, then
moving it, the program will return the state of Add and a further body
can be created or by the Left mouse button, you can exit.
If you don't want to change each default parameter separately, then pressing,
releasing the button, then moving the mouse is enough to create a body. All the
above is very simple in practice and both the mouse pointer and the status bar
give helping information.
Controls in the dialog window Add bodies are contained in
Table 15 and shown in Figure 17 with
illustrative data:
Table 15. Elements in the dialog window Add bodies
Figure 17. The dialog window Add bodies
To be given as compulsory, the name of a body shall be minimum 1 or maximum
32 characters long. The default values for bodies can be set in the dialog
window Default properties. The program substitutes the star (*) character in the
name with a number automatically increasing, thus each new body will have a new
name. The initial value of this number is set in the field
Numbering of body
names.
The numbering of body names will start from this number.
They are the x and y components of the velocity vector of the
bodies. The bodies will be displayed with this initial velocity vector. The
vector unit is bracketed. They are numbers of double type.
The bodies will have such masses with their unit bracketed. It is a number of
double types.
The bodies will have such initial diameters with their unit bracketed. It is
a number of double types.
This is a list box to adjust a body groups, contains the names of all the 16
groups. Each body will belong to the same groups.
This is the color of the bodies. It is an RGB value.
Bodies can be made selected, or holded.
See further the section
Selection,
Body holding.
The program gets in the state of Simulation by the menu item
Main
menu/Motion/Run (or also by the menu item Main menu/Motion/Step
for the time of a screen refresh), or by the ToolBar or by the
Control Panel.
Information contained in the Mouse pointer and the general field of the
StatusBar is as follows:
In this example, the simulation is in the 4300th second (non-real time), this
is equivalent to 1 hour, 11 minutes and 40 seconds, as seen in the bracketed format
year-month-day hour:minute:second.
During the Simulation state, the program runs along two threads. Due to this, view (see Change view) and
Zoom can be changed without exiting
this state. Therefore, during simulation, view and zoom are
changed otherwise than it is in the Edit state. During simulation, view
can be changed by the Left mouse button and zoom by the
Right mouse
button. And by the Shift or Control keys the same can be, continuously (see
Continuous change to view,
Continuous zoom).
In place of the Shift and Control keys in the status bar, the sign
"+"
indicates that by pressing them, the program will get in the continuous
state (see
Continuous change to parameter), namely in the
View+ state by
the Left mouse button and in the Zoom+ state by the
Right mouse button.
Furthermore during simulation, major system parameters can be changed by the
Main menu, the ToolBar, and the Control Panel. From the
simulation state, you can exit by repeating the entry command.
States you may achieve by buttons of the keyboard and the mouse are as
follows:
See further the section
Menu items disabled during simulation.
