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Plot Layout
Each plot requires the calculation of a series of boxes (rectangular screen areas).
These are of two types:
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frame boxes determine the frame in which the next sequence of plot commands operates.
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item boxes determine the position of specific graphic items.
These calculations are done automatically, but some cases can be specified by the user. These are:
1. PlotBox - isigraph window size, or the parameter to the eps or pdf commands.
2. SubBox - parameter to the sub command.
3. DrawBox - parameter to the new or use commands.
4. KeyBox - position determined by parameters to the keypos option.
The layout calculations then determine the frame boxes, in decreasing size:
1. PlotBox Pxywh - entire graphic window.
2. SubBox Sxywh - a subset of Pxywh.
2. DrawBox Dxywh - area used for the specific plot. If there is only one plot and it takes the entire
window, then it is the same as the SubPlotBox.
3. The following item boxes are then calculated and positioned so as to avoid overlaps:
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TitleBox Txywh - for the Title, at the top.
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YCapBox Yxywh - for the Y Caption, on the left.
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Y2CapBox Y2xywh - for the second Y axis Caption, on the right.
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XCapBox Xxywh - for the X Caption, at the bottom
4. The inside area remaining is OutBox Oxywh, the area available for drawing an outside key. In this case, the key item box is calculated:
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KeyBox Kxywh - for drawing keys. Positioned now only if it is an outside key.
5. LabelBox Lxywh - area that remains after positioning the outside key item boxe. Labels are drawn in this box.
6. FrameBox Fxywh - area in which the plot axes are drawn.
7. GrafBox Gxywh - area in which the data is plotted.
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If there is an extended frame, it is slightly smaller than the frame. In this case
ticmarks appear in the FrameBox, but do not intrude into the GrafBox.
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Otherwise, it is the same as the FrameBox. Ticmarks will intrude into the drawing area.
8. An inside KeyBox is drawn after drawing the rest of the plot.
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