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Editing a graphics image
Selector button
To edit any drawn scientific calculator graphics image item (i.e. line, rectangle, circle etc) first
click the selector button (shown above) and select the image item to be
edited. This can be achieved by using the mouse pointer and left
clicking the associated red dots for that graphics item. When the item has
been selected the image is redrawn with dashed lines, as shown
next.
Selected is a yellow rectangular box

After selecting the image, the image may be moved or its size changed by holding
down the left mouse button and moving the cursor. The center red dot
allows the whole image to be moved around the screen, whilst the outside
red dots allow the image to be resized, that is the width and / or height may be changed.
If the values associated with its physical structure need to be edited
directly, then after selecting the image, right clicking the red dot of
the image will open the editor panel at the bottom of the scientific calculator as shown next.

This edit box appears at the bottom of the scientific calculator.
The values X1 and Y1 show the location of the top left red dot of the yellow
rectangle being edited, and the value X2 and Y2 represent the bottom right hand red dot.
These X1,Y1,X2 and Y2 values may be edited. Once edited use the refresh button to show the changes.
The screen top left corner is referenced (X= -16) (Y= +16) and the bottom right hand
corner is referenced (X= +16) (Y= -16). The current mouse cursor position is
shown just to the right of the scientific calculator readout below the calculator keys.

The current cursor position
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