Measurement Computing DIAdem - Manual (Page 35)

DIAdem® 04-19-00 DIAdem® VIEW: Viewing, Measuring & Editing Data 33
Using Zoom, Scrolling and Screen Partition
Zoom:
Enlarging Graph Segments
If you want to inspect a given region of a graph with increased precision, you can use the
DIAdem
® VIEW zoom feature to portray selected portions of the graph in enlarged format. The
zoom feature can be executed only with a band or frame cursor.
The band cursor consists of two parallel vertical cursor lines which define a segment of width
delta X (designated dx in the Status line). The X position of the cursor line that is set first is used
for the X
1
coordinate, to which is also assigned the small square, the so-called “Hot Spot.” The
X-position of the cursor crosshair that is set last is used for the X
2
-coordinate. The same applies
correspondingly for the Y
1
- and Y
2
-coordinates of the frame cursor.
Activating the band cursor
Copy the graph from the upper axis system into the axis system on the lower left. Then activate
the band cursor in the Tool bar.
Move the band cursor by clicking between the two cursor lines and moving the mouse right or
left while the left mouse button is held down. You can define the width of the band cursor by
positioning the cursor crosshairs.
√
Widening the band cursor range
Move both band cursor lines with the left mouse button held down until the region of the graph
you wish to inspect lies between the two cursor lines.
Zoom in
Now turn the zoom on for this axis.
The graph segment delineated by the band cursor now fills up the entire axis system.
A graph in maximized view
and the band cursor section
in zoomed view
If several graphs are defined in the same axis system, graph segments [that are contained within
the band cursor] will be equally magnified. Note that you can zoom in on segments recursively,
thus inspecting smaller and smaller graph segments.
Zoom off
After you turn off the zoom, the original graph is displayed, no matter how many times you have
zoomed in.
Frame cursor
The frame cursor is used in the same manner as the band cursor. In addition to horizontal lines, it
provides vertical definition.