Drawing the Graph

Next: Graphics Context, Previous: Column Ranges, Up: PostScript Graphing

5.9.2.2 Drawing the Graph

— Function: plot-column array x-column y-column proc3s

Plots points with x coordinate in x-column of array and y coordinate y-column of array. The symbol proc3s specifies the type of glyph or drawing style for presenting these coordinates.

The glyphs and drawing styles available are:

line: Draws line connecting points in order.
mountain: Fill area below line connecting points.
cloud: Fill area above line connecting points.
impulse: Draw line from x-axis to each point.
bargraph: Draw rectangle from x-axis to each point.
disc: Solid round dot.
point: Minimal point – invisible if linewidth is 0.
square: Square box.
diamond: Square box at 45.o
plus: Plus sign.
cross: X sign.
triup: Triangle pointing upward
tridown: Triangle pointing downward
pentagon: Five sided polygon
circle: Hollow circle

— Function: plot-text-column array x-column y-column t-column proc3s

Plots text in t-column of array at x coordinate in x-column of array and y coordinate y-column of array. The symbol proc3s specifies the offset of the text from the specified coordinates.

The offsets available are:

above: Draws the text centered above at the point.
center: Draws the text centered at the point.
below: Draws the text centered below the point.
left: Draws the text to the left of the point.
right: Draws the text to the right of the point.

All the offsets other than center are calculated to keep the text clear of a glyph drawn at the same coordinates. If you need more or less clearance, use set-glyphsize.