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Manual page for proc_drawcommands(PL)
drawcom
DESCRIPTION
proc drawcommands may be used to perform basic drawing operations
such as lines, polygons, and text, in either absolute space
or scaled space. This may be a flexible way to add annotation,
or to add graphics that the other plotting procedures cannot produce.
You need to provide the commands in a file, or embedded within your
ploticus script. Or, you can use the
draw prefab.
The commands are interpreted, and should be given one per line.
Note that proc drawcommands have nothing to do with proc getdata or the
"current data set".
EXAMPLE
Here's an example of draw commands.
For a quick tutorial on draw commands, see the end of this page.
#proc drawcommands
commands:
color blue
linetype 0 2 1
mov 1 1
lin 1 2
lin 2 2
lin 1 1
A Gallery example where proc drawcommands is used is
drawcom
PREREQUISITES
None. If draw commands involving scaled space are used,
proc areadef must have been executed to set up a plotting area.
MANDATORY ATTRIBUTES
Either commands or file containing commands (see below).
ATTRIBUTES
commands
multiline-text
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A list of one or more draw commands. One command per line.
Quoting is never used for string literals.
Ends with a blank line.
file filename
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A file containing draw commands. May be stdin to
read draw commands from standard input.
THE DRAW COMMAND SET
Here is a summary of the draw command set.
For an explanation of absolute units and scaled units, see
scaleunits
Command | Description |
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mov x y
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= move to (x,y) in absolute units
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lin x y
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= line to (x,y) in absolute units
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path x y
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= extend current polygon fill path to (x,y) in absolute units
(see also fill below).
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movs, lins, paths
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= same as above but for scaled units (assumes proc areadef
has already been used to set up a scaled space).
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movp, linp, pathp
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= same as above but operands may be in either
absolute space or scaled space. If an operand ends with (s)
it is assumed to be in scaled space; otherwise it is assumed to
be in absolute space.
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text s
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= display text string s left adjusted at current location.
s should not be enclosed in quotes.
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centext s
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= display text string s centered around current location
s should not be enclosed in quotes.
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rightjust s
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= display text string s right-aligned to current location
s should not be enclosed in quotes.
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cblock x1 y1 x2 y2 color outline
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= display a colored rectangle. The
lower left is at (x1,y1) in absolute units; upper right is at (x2,y2)
in absolute units; color is the color; outline is 1 to produce an outline, 0 not.
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fill
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= close and fill the polygon path with the current color.
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mark
x y
sym r
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= produce a symbol at (x,y).
sym is a graphcore data point symbol code as described
in
symboldetails.
r is the radius in absolute units.
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color c
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= set the current color to c
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textsize p
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= set the current text size to p points
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linetype style width dashscale
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= set the current
line details.
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clr
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= clear the display
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backcolor c
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= set the current background color to c
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HOW TO USE DRAW COMMANDS
Suppose you have an imaginary pen,
color blue sets the pen color to blue
mov x1 y1 would move the "pen" to x1,y1 in inches from lower left corner
lin x2 y2 would lower the "pen" and then draw a line to x2,y2
lin x3 y3 would continue the line to x3,y3
If you don't want to use inches, you can set up a plotting area
with whatever xrange and yrange you want. Then..
movs x1 y1 would move the pen to x1,y1 relative to xrange and yrange
lins x2 y2 would lower the pen and then draw a line to x2,y2
lins x3 y3 would continue the line to x3,y3
This is fine for drawing lines, but what about filled shapes?
To do shapes, you do the same thing as above, but use path instead
of lin, or paths instead of lins. When you have drawn one
shape, you fill it in using:
fill red
Then you can begin the next shape.
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 data display engine
Copyright Steve Grubb
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