8.4 Scene and View Options
A "Scene" is defined as the space represented by the model
coordinate system.
Each scene has its own
menu of selections but they can be different for different scenes.
A "View is defined as that portion of the scene
which is drawn in the window.
There can be many views of a particular scene.
Graphs and Shape window
- Scenes use an "openlook" style in which the:
- The left mouse button is a selecting a tool,
- The right mouse
button pops up menus.
- The middle mouse button translates the view around the scene.
Pressing the right mouse
button
pops up menus from which one either selects
- an action to be performed
immediately, eg. Round or Whole Scene, or else
- a meaning for
the left(select) mouse button which will be used when it
is pressed within any view of that particular scene.
These menu items are like radio buttons in that only one is active at
a time. It is recommended that when you move into a view you quickly
pop up the menu so you can be certain of the meaning of the left button.
All
scenes have a common "View menu" as the first menu item.
With it one can create a new view, zoom in/out, round the view
or make the view correspond to the natural size of the scene.
>
View=Plot
Scales the view so that the full plot of variables can be seen.
10% ZoomOut
View more of the scene, keeping the center of the view
fixed.
10% ZoomIn
View less of the scene, keeping the center of the view
fixed.
NewView
Provides for the creation of new view windows by
using the left mouse button to
draw a rectangle in the view which will become the interior of
a new view. Press the left mouse button at one corner of the desired
view and drag it to the opposite corner. The new view window can
then be
resized and positioned using your window manager.
ZoomInOut
Choose a location to be the fixed point of zooming (ie doesn't change
its position) and press the left mouse button there.
Drag the mouse up and to the right to zoom in. Drag
the mouse down and to the left to zoom out. Graph views have
independent scaling in the x and y directions. There is
a bias toward changing only one dimension coresponding to
the general drag direction. Shape views
have a constant aspect ratio so only the x direction is used
for zooming. The view may be returned to normal by choosing
the "View=Plot" option.
Translate
Drag the scene around in the view with the middle mouse button.
There is a drag bias which
makes it easier to move in the horizontal or vertical direction
without change in the other dimension.
RoundView
The header of each view window shows the size of the "canvas"
in model coordinates. Pressing this button rounds the view
so these numbers don't have so many decimal places.
The algorithm for rounding needs improvement.
WholeScene
Adjusts the zoom and translation so the view is of the
entire scene with a 10% border.
SetView
Allows the user to adjust a view to desired scales along both axes.
Successive dialogs appear in an edit box showing the current ranges for x and y
axes and allows (and requires) the user to
enter two numbers (separated by a space) for the beginning and end
of axes. Default values are left, right, bottom, top of view
reduced by 10%. The view size is set to the entries and then
the view zooms out by 10%. Accepting the default values
leaves the view unchanged.
Scene=View
Defines the size of the whole scene.
Sets the scene size to the size of the view. Subsequent
Whole Scene adjustments will return to this size.
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