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Dataplot Vol 1 Vol 2

SPIKE COLOR

Name:
    SPIKE COLOR
Type:
    Plot Control Command
Purpose:
    Specifies the colors used to draw spikes on subsequent plots.
Description:
    A spike is a vertical line from the plot point to the spike base (most typically the x axis). Dataplot defines the points on a plot by "traces". A trace is a set of points that are drawn with the same attributes. For example,

      PLOT Y1 X1 AND
      PLOT Y2 X2

    has two traces. The first is the points defined by Y1 and X1 and the second is the points defined by Y2 and X2. Attributes can be set for up to 100 traces.

    Dataplot provides two methods for specifying colors.

    1. Colors can be defined by name (or by the corresponding index). Dataplot adopted it's named colors from the X11 project. Currently, 162 named colors and 100 levels of grayscale are supported. Grayscale can be specified with either G0, G1, ..., G100 (or -1, -2, ..., -100). Many older devices support only a limited number of colors. For these devices, unsupported colors will be mapped to one of the available colors. To specify a named color, see Syntax 1.

    2. Most modern graphics devices support full RGB (RedBlueGreen) color. You can alternatively specify RGB colors by entering three integer values to represent the Red, Green and Blue components, respectively. These values should be in the range 0 to 255.

    When setting the spike color, Dataplot first checks if the device supports RGB colors. If not, the named color will be used. If the device does support RGB color, Dataplot will check if an RGB color has been specified. If yes, then that RGB color is used. If not, the named color will be used.

    To see the list of supported named colors (with the associated index number), see

    https://www.itl.nist.gov/div898/software/dataplot/refman1/ch11/homepage.htm

Syntax 1:
    SPIKE COLORS <color 1> <color 2> ... <color n>
    where <color 1>, ..., <color n> specify the desired spike colors.

    Up to 100 such spike colors may be specified.

Syntax 2:
    SPIKE RGB COLORS <red-1> <green-1> <blue-1> ...
                            <red-n> <green-n> <red-n>
    where <red-1>, <green-1>, <blue-1>, ..., <red-n>, <green-n>, <blue-n> is a list of integer values that specify the desired RGB spike colors.

    Up to 100 such triplets of color values can be specified.

    To turn off the RGB color, set the values to -1 (any negative value will work). Values greater than 255 will be set to 255.

Examples:
    SPIKE COLOR RED BLUE GREEN
    SPIKE COLORS BLACK ALL
    SPIKE COLORS ALL RED
    SPIKE COLORS
    SPIKE RGB COLORS 220 109 88 240 220 160
    SPIKE RGB COLORS 220 109 88 ALL
    SPIKE RGB COLORS 220 109 88 240 220 160
    SPIKE RGB COLORS 220 109 88 ALL
Note:
    The SPIKE COLOR command with no arguments sets the spike color to default for all traces. The SPIKE COLOR command with the word ALL before or after the specified type assigns that color to all traces; thus SPIKE COLOR RED ALL or SPIKE LINE ALL RED plots spikes with red lines for all traces.
Default:
    All spikes are drawn with black lines and RGB colors are off.
Synonyms:
    SPIKE PATTERN
Related Commands: References:
    William S. Cleveland (1985), "Elements of Graphing Data," Wadsworth Advanced Books and Software.

    William S. Cleveland (1993), "Visualizing Data," Hobart Press.

Applications:
    Presentation Graphics
Implementation Date:
    Pre-1987
    2020/11: Support for RGB colors
Program:
     
    LET CARTER = DATA 66 30 11 43 44 41 35 82 54 36
    LET REAGAN = DATA 26 54 84 47 51 51 52 14 36 55
    LET X = DATA 1 2 3 5 6 7 8 10 11 12
    .
    LET CART2 = -CARTER
    LET XJUNK = DATA 0.5 12.5; LET YJUNK = DATA 0 0
    .
    TIC MARK LABEL FORMAT ALPHA
    YLIMITS 1 12
    YTIC OFFSET 1 1
    Y1TIC LABEL CONTENT DEMOCRATS INDEPENDENTS REPUBLICANS SP() ...
          EAST SOUTH MIDWEST WEST SP() BLACKS HISPANICS WHITES SP()
    MINOR Y1TIC MARK NUMBER 0
    X1LABEL PERCENT
    XLIMITS -100 100
    MAJOR XTIC MARK NUMBER 11
    MINOR XTIC MARK NUMBER 1
    XTIC MARK LABEL CONTENT 100 80 60 40 20 0 20 40 60 80 100
    .
    LINE BLANK BLANK SOLID
    SPIKE ON ON OFF
    SPIKE THICKNESS 0.5 ALL
    SPIKE DIRECTION H ALL
    .
    SPIKE COLOR G25 G75
    TITLE DEMONSTRATE GRAYSCALE SPIKE COLOR COMMAND
    PLOT X VS REAGAN AND
    PLOT X VS CART2 AND
    PLOT XJUNK YJUNK
    .
        

    .
    SPIKE COLOR RED BLUE
    TITLE DEMONSTRATE SPIKE COLOR COMMAND
    PLOT X VS REAGAN AND
    PLOT X VS CART2 AND
    PLOT XJUNK YJUNK
    .
        

    .
    SPIKE RGB COLORS 220 109 88 240 220 160
    TITLE DEMONSTRATE SPIKE RGB COLOR COMMAND
    PLOT X VS REAGAN AND
    PLOT X VS CART2 AND
    PLOT XJUNK YJUNK
        

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Date created: 01/26/2021
Last updated: 01/26/2021

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