Geometria employs a fixed right-hand reference system. The Z axis of the reference system is parallel to the vertical edge of the screen. No knowledge of the reference system is necessary to manipulate figures, create and solve problems.
At any given time, the figure has a certain attitude. The attitude can be described in terms of angles the figure forms with the reference system. When a figure is created, it has the default attitude. The figure's attitude changes as the figure is rotated.
To revert a figure to the initial attitude, select Initial Attitude from the View menu or right click and select Initial Attitude from the popup menu.
When a figure is saved, its current attitude becomes its initial attitude. To revert to the attitude the figure had when it was created, before any subsequent rotations, select Default Attitude from the View menu.
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Toggle the selector off and stroke a figure with the mouse to rotate the figure. The rotation speed and angle will depend on the stroke.
To pin a rotating figure, click on it.
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Right click on a figure and select
Toggle Selector from the popup menu.
Alternatively, click the selector button
on the tool bar.
When the selector is on (white selector icon), elements can be selected by clicking on them. When the selector is off (dimmed selector icon), dragging the mouse will rotate the figure.
The selector is off by default.
Click an element, such as a point, a segment or a face, to select (highlight) it. To select more than one element, hold down the Ctrl key. Faces can only be selected in non-transparent view mode.
Click on an empty space inside a figure to clear the selection. Hold down the Ctrl key and click on a selected element to clear that element alone.
To select all points and segments in a figure (with the exception of vertices and edges), select Select All from the Edit menu. This action offers a convenient way to erase all elements at once.
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To toggle the view mode of a figure between transparent and opaque, select
Toggle Transparency from the
View
menu. Alternatively, click the
button on the tool bar.
In a transparent figure, visible segments are solid, whereas invisible segments are dashed. Any point or segment can be selected, whether it is visible or not. Faces can only be selected in an opaque figure.
In an opaque figure, invisible segments and points are not shown. Points, segments and faces can be selected only if they are visible.
To change the color of an opaque figure, select
Set Color from the
View menu or click the color selector button
on the tool bar.
Select a color in the popup dialog and click
OK.
To show or hide point labels, select
Toggle Labels from the
View
menu. Alternatively, click the
button on the tool bar. Labels will only show in
transparent figures.
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To zoom in on a figure, select Zoom In from
the View menu or click the
button on the tool bar.
To zoom out, select Zoom Out from
the View menu or click the
button on the tool bar.
To resize a figure so it fits into the window,
select Fit To View from
the View menu or click the
button on the tool bar.
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