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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<title>Edit Graph</title>
</head>
<body>
<h1>Edit Graph</h1>
<P> A POW <B>Graph</B> consists of a number of <B>Curves</B> and
<B>Images</B> drawn within a given rectangular region. The <B>Edit
Graph</B> item in the <B>Edit</B> menu brings about a dialog box from
which one can control what objects are drawn, how they are displayed,
and how the graph itself is drawn...</P>
<P> The dialog box consists of 3 major regions. The top portion
controls the contents of the current (or new) graph. The box on the
left lists the objects currently in the graph. The box on the right
lists all the available objects which are not in the graph. In both
boxes, the type of each object (image or curve) will be indicated in
parentheses after the objects' names. The <B>Add</B> and
<B>Remove</B> buttons in between allows one to move the selected
objects between the two lists. The name of the graph being editted is
given below the left box. This can be changed if one wants to create
a new graph rather than modify the current one. The <a
href="EditObjects.html"><B>Edit Objects</B></A> button under the right
box opens up another dialog box which allows one to edit the data
structures which define Curves and Images.</P>
<P> The second region, below the graph contents section, contains the
editable display options for the graph and graph objects. It has a
paned format. At its top are a series of labeled tabs. Click on one of
the tabs to view and edit that set of options. Each tab and its options
are described below...</P>
<UL>
<LI> <B>Graph</B>
<P>This pane contains the highest-level options affecting a
graph's appearance. The first entry box contains the graph's
title string. By default it is the graph name used internally by
POW, but it can be any string or even blank. The entry boxes list,
for both the X and Y
axes, the <B>Label</B> to be written, the <B>Min</B> and
<B>Max</B> values of the axis (actually, the lower-left and
upper-right bounds of the graph's display region), the
<B>Units</B> label of the values (printed within parentheses
after the axis label), and the <B>Size</B> of the graph on the
screen in pixels. Any or all of these may be NULL which tells
POW to use the default values. In the case of the bounding box
(Min/Max), default values will be determined by the minimum
values required to display all the graph's contents. For
<B>Units</B>, a NULL value will indicate not to list any units in
the label axes. Clicking the <B>Reset Min/Max</B> button at the
bottome sets all the bounding box values to NULL.</P>
<P>Below the entry boxes are a set of buttons labeled
<B>Scaling</B>. These activate logarithmic graphs. The first
row of <B>linear</B> and <B>log</B> buttons cause each axis to be
drawn in either linear or logarithmic format. This does not
affect the data, just how the graph coordinates are interpretted
and labeled. The <B>Scale curve data to axes</B> check button
determines whether the curves in this graph will be converted to
the same axis format. Do not check this if any of your curves
already contain logarithmic values (instead of the true values)
and you only need to change how the axes are displayed, not how
the curves are plotted. You can control the logarithmic
conversion of individual curve data from the Points and Lines
panes.</P>
<LI> <B>Fonts</B>
<P> This pane controls the appearance of text in the graph. One can
independently set the font, size, style, and color of the <B>Title</B>,
<B>Axis Labels</B>, <B>Tick Labels</B>, and default <B>Text Labels</B>.
The Text Label value is used only for the initial text label. All
subsequent labels inherit their values from the previous label.</P>
<LI> <B>Ticks</B>
<P> This pane controls the appearance of the tick marks and
associated grid lines. Use the slidebars to indicate
approximately how many tick marks should be drawn (and labeled)
on each axis of the graph. At the far left, no tickmarks will be
drawn on each axis. At the far right, about 30 may be drawn.
The <B>X Ticks</B> and <B>Y Ticks</B> options control whether the
X and Y tickmarks are drawn inside or outside the graph's box and
whether they are labeled on the left and bottom axes. The
<B>Tick Labels</B> option selects between Decimal and Base 60
(degrees minutes seconds) numerical formats. Base 60 is only used
when a graph contains WCS information. If the <B>Grid Lines</B>
checkbox is selected, lines will drawn on the graph, tracing the
path of each tick mark coordinate. One can control the
<B>Color</B> and line <B>Style</B> (solid, dashed, etc) of these
lines.</P>
<LI> <B>Points</B>
<P> The checkbox at the top of this item indicates whether the
individual points of the curve should be drawn. The points can
be drawn as any of the 7 listed <B>shapes</B>. The </B>size</B>
of the points (except Dot which is always 1 point) can either be
<B>fixed</B> at a constant size indicated by the slidebar, or
drawn with widths/heights indicating the X and Y <B>error
bars</B>. If there are X/Y error bars but the points are drawn
in a fixed style, the error bars will be indicated by
horizontal/vertical lines centered on the point. Points can be
<B>Fill</B>ed or just drawn in outline. Finally, select the
desired <B>color</B> from the displayed colorbar. This can be a
different color than selected in the Lines pane.</P>
<P> At the bottom of the pane is a pair of LogX/logY
checkbuttons. Checking these will cause this curve to have the
logarithm of its data plotted instead of its true values. If
the data is logarithmic already, leave these options unchecked,
but select the appropriate <B>Scaling</B> mode in the Graph
options (see above).</P>
<LI> <B>Lines</B>
<P> The checkbox at the top of this pane indicates whether data
points will be connected with a continuous line. The line can be
of several patterned <B>styles</B> or <B>widths</B>. The points
can also be <B>connect</B>ed directly (<B>Normal</B>) or in a
stair-step pattern (<B>Histogram</B>). In the latter mode, the
<B>Fill Boxes</B> option draws the histogram as a series of solid
boxes instead of an outline. Finally, select the desired <B>color</B>
from the displayed colorbar. This can be a different color than
selected in the Points pane.</P>
<P> At the bottom of the pane is a pair of LogX/logY
checkbuttons. Checking these will cause this curve to have the
logarithm of its data plotted instead of its true values. If
the data is logarithmic already, leave these options unchecked,
but select the appropriate <B>Scaling</B> mode in the Graph
options (see above).</P>
<LI> <B>Image</B>
<P>This pane controls the appearance of images. Most of the pane
consists of a bunch of different colormaps. They are grouped in
the same sequence as listed in the <a
href="Color.html"><b>Color</b></a> menu: smooth, continuous
colormaps, followed by ramps, then the step functions. The
<B>Invert</B> option will reverse the order of the colormap when
turned on. The <B>Scaling</B> option controls how the colormap
is applied to the image. For <B>Linear</B> scaling, each
colormap level corresponds to a constant intensity range in the
image. <B>Square-Root</B> scaling changes the mapping such that
the intensity range covered by each color level increases as the
square-root function, producing higher contrast at lower
intesities. <B>Logarithmic</B> scaling uses the logarithmic
function for colormapping, giving even more contrast at low
intensities than sqrt. <B>Histo Equalize</B> scaling computes
a histogram of the image and tries to distribute colors equally
over the number of pixels. The <B>Range</B> entry boxes at the
bottom list the intensity range over which the colormap should be
applied. Initially, they will contain the full intensity range
of the image. The <B>Reset</B> button resets these values to the
full range of the image.</P>
</UL>
<P> At the very bottom of the dialog box are 3 buttons. <B>Apply</B>
will update the selected graph using the modified parameter values.
The <B>Reset</B> button will reset the parameter options and
object lists based on the currently selected graph (for when one
either wants to revert to the original parameters, or if one selected
a new graph, or if new objects were created). The <B>Exit</B> button
closes the dialog box. Any changes will be lost if not <B>Apply</B>ed
before exitting.</P>
</body>
</html>
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