Chapter 10. PHPlot Class Member Variables
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## Chapter 10. PHPlot Class Member Variables

This chapter provides information about the PHPlot class member variables and constants.

Most PHPlot class member variables are meant for internal use only, and are declared to have protected visibility (starting with PHPlot-6.0.0). This means they are not accessible from your application, unless you define a class that extends PHPlot. All these member variables are subject to change in future releases without concern for backward compatibility.

One exception is the plot tuning variables, which have public visibility. Section 4.7, “Tuning Parameters” describes how these PHPlot member variables can be used to adjust plot appearance. Setting them from your application is generally safe, as they have relatively small effects on plots, and are less likely to change in future releases.

A few additional member class variables have public visibility, due to past use in applications, but you should avoid using them. This includes `img`, the GD image resource, and `fonts`, the array of font information.

## 10.1. List of Member Variables

The table below lists the PHPlot class member variables.

The initial values are listed under Default Value. Variables which are declared but not initialized at the top of the PHPlot class definition have nothing in this column. They can be considered to have an initial value of NULL, which is significant for some variables but not for others.

The Reference Function column lists the member function(s) used to set the variable, if the variable can be set by the application, else the member function which calculates the variable, if there is one, else the member function(s) which use the variable, if there are only a few.

Variables which hold color values are initialized to defaults using SetDefaultStyles when a PHPlot object is created. For the default colors, see Section 3.5.5, “Plot Element Colors”.

Variable Name: | Default Value: | Reference Function: | Description:
--- | --- | --- | ---
actual_bar_width |  | CalcBarWidths | Calculated width of bars for bar charts
bar_adjust_gap |  | CalcBarWidths | Calculated bar gap
bar_extra_space | 0.5 | CalcBarWidths | Extra space between groups of bars (See Tuning Parameters for more)
bar_width_adjust | 1 | CalcBarWidths | Width of bar relative to space for one bar (See Tuning Parameters for more)
bg_color |  | SetBackgroundColor | Color (R,G,B,A) for image background
bgimg |  | SetBgImage | Background image filename
bgmode |  | SetBgImage | Background image tiling mode
browser_cache | FALSE | SetBrowserCache | Flag: Don't send cache suppression headers
boxes_frac_width | 0.3 | DrawBoxes | Scale factor for box widths in box plots. Default is 0.3, meaning within min and max limits the boxes will use 30% of the available space for half their width. (See Tuning Parameters for more) (Added in PHPlot-6.1.0)
boxes_max_width | 8 | DrawBoxes | Maximum half-width for boxes in box plots. Default is 8 pixels. (See Tuning Parameters for more) (Added in PHPlot-6.1.0)
boxes_min_width | 2 | DrawBoxes | Minimum half-width for boxes in box plots. Default is 2 pixels. (See Tuning Parameters for more) (Added in PHPlot-6.1.0)
boxes_t_width | 0.6 | DrawBoxes | Ratio of the width of the 'T' ends of box plot whiskers to the width of the boxes. Default is 0.6. (See Tuning Parameters for more) (Added in PHPlot-6.1.0)
bubbles_max_size |  | DrawBubbles | Max bubble size for bubbles plots (See Tuning Parameters for more) (Added in PHPlot-5.4.0)
bubbles_min_size | 6 | DrawBubbles | Min bubbles size for bubble plots (See Tuning Parameters for more) (Added in PHPlot-5.4.0)
callbacks | array(...) | SetCallback | Callback (hook) function information. Indexed by callback reason; value is an array of function name and pass-through argument if the callback is in use, else NULL.
dashed_grid | TRUE | SetDrawDashedGrid | Flag: Draw dashed or solid grid lines?
dashed_style | '2-4' | SetDefaultStyles | Initial dashed pattern code
data |  | SetDataValues | The data array
data_border_colors |  | SetDataBorderColors | Array of colors (R,G,B,A) for bar chart data borders.
data_colors |  | SetDataColors | Array of colors (R,G,B,A) for data lines/marks/bars/etc. See default_colors for initial value.
data_columns |  | CheckDataArray | Maximum number of dependent variable values (usually Y values, or pie segments) in the data array rows. (Added in PHPlot-5.1.3)
data_max |  | FindDataLimits | Array: Per row maximum Y value. (Before PHPlot-5.1.2 this was named data_maxy.)
data_min |  | FindDataLimits | Array: Per row minimum Y value. (Before PHPlot-5.1.2 this was named data_miny.)
data_type | 'text-data' | SetDataType | Format of the data array
data_units_text | '' | FormatLabel | Obsolete - suffix for 'data'-formatted labels
data_value_label_angle | 90 | CheckDataValueLabels | Angle (in degrees) for data value labels (See Tuning Parameters for more)
data_value_label_distance | 5 | CheckDataValueLabels | Distance (in pixels) for data value labels (See Tuning Parameters for more)
datalabel_color |  | SetDataLabelColor | Color (R,G,B,A) to use for axis data labels (Added in PHPlot-5.7.0)
datatype_error_bars |  | DecodeDataType | Flag: data type has error bars. (Added in PHPlot-5.1.3)
datatype_implied |  | DecodeDataType | Flag: data type has implied X or Y. (Added in PHPlot-5.1.3)
datatype_pie_single |  | DecodeDataType | Flag: data type is one-column data for pie chart with one segments per row. (Added in PHPlot-5.1.3)
datatype_swapped_xy |  | DecodeDataType | Flag: data type has swapped X and Y values. (Added in PHPlot-5.1.3)
datatype_yz |  | DecodeDataType | Flag: data type includes Y and Z value pairs (Added in PHPlot-5.5.0)
datatypes | array(...) | DecodeDataType, SetDataType | Static array of data type information (Added in PHPlot-6.1.0) (See notes for more)
datatypes_map | array(...) | SetDataType | Static array of data type aliases (keys) and the corresponding primary name (values) (Added in PHPlot-6.1.0)
decimal_point |  | SetNumberFormat | Character to use for decimal point in formatted numbers
default_colors | array(...) | SetDataColors, SetErrorBarColors | The default color array, used to initialize data_colors and error_bar_colors. (Added in PHPlot-5.1.0)
default_dashed_style |  | SetDefaultDashedStyle | Formatted PHP code to build a dashed line pattern
default_ttfont |  | SetDefaultTTFont, GetDefaultTTFont | Default TrueType font file. (Through PHPlot-5.1.2, there was a static default 'benjamingothic.ttf'. After PHPlot-5.1.2, the default is dynamic.)
done | array() | DrawBackground, DrawImageBorder, DrawTitle | Array of flags for elements that must be drawn at most once. Flag is set TRUE when drawn. Indexes are: background, border, title. (Replaced separate variables in PHPlot-5.3.1.)
draw_broken_lines | FALSE | SetDrawBrokenLines | Flag: How to handle missing Y values
draw_data_borders |  | SetDrawDataBorders | Flag: Draw data borders on bars, stackedbars (Added in PHPlot-6.0.0)
draw_pie_borders |  | SetDrawPieBorders | Flag: Draw borders on pie chart segments (Added in PHPlot-6.0.0)
draw_plot_area_background | FALSE | SetDrawPlotAreaBackground | Flag: Draw the background of the plot area
draw_x_data_label_lines | FALSE | SetDrawXDataLabelLines | Flag: Draw X data label lines
draw_x_grid |  | SetDrawXGrid | Flag: Draw X grid lines? (True, False, or NULL meaning the default behavior)
draw_y_data_label_lines | FALSE | SetDrawYDataLabelLines | Flag: Draw Y data label lines (Added in PHPlot-6.0.0)
draw_y_grid |  | SetDrawYGrid | Flag: Draw Y grid lines? (True, False, or NULL meaning the default behavior)
dvlabel_color |  | SetDataValueLabelColor | Color (R,G,B,A) to use for data value labels (Added in PHPlot-5.7.0)
error_bar_colors |  | SetErrorBarColors | Array of colors (R,G,B,A) for error bars. See default_colors for initial value.
error_bar_line_width | 1 | SetErrorBarLineWidth | Thickness of error bar lines
error_bar_shape | 'tee' | SetErrorBarShape | Shape (style) of error bars: line or tee
error_bar_size | 5 | SetErrorBarSize | Size of error bars
file_format | 'png' | SetFileFormat | Image format: png, gif, jpg, wbmp
fonts |  | SetFontGD, SetFontTTF | Array of font information. (See notes for more)
grid_at_foreground | FALSE | DrawGraph | Flag: Draw grid on top of or behind the plot (See Tuning Parameters for more)
grid_color |  | SetGridColor | Color (R,G,B,A) to use for axes, plot area border, legend border, pie chart lines and text (not grid!)
group_frac_width | 0.7 | CalcBarWidths | Controls fraction of bar group space used for bar (See Tuning Parameters for more)
i_border |  | SetImageBorderColor | Color (R,G,B,A) for image border, if drawn
image_border_type | 'none' | SetImageBorderType | Image border type
image_border_width |  | SetImageBorderWidth | Width of image border in pixels. Default depends on image_border_type. (Added in PHPlot-5.1.2)
image_height |  | PHPlot | Image height
image_width |  | PHPlot | Image width
img |  | PHPlot | Image resource
in_error |  | PrintError | Prevent recursion in error message image production
is_inline | FALSE | SetIsInline | Don't send headers
label_format | array(...) | SetPieLabelType, SetPrecisionX, SetPrecisionY, SetXDataLabelType, SetXLabelType, SetXTimeFormat, SetYDataLabelType, SetYLabelType, SetYTimeFormat | Label format info. (See notes for more)
label_scale_position | 0.5 | SetLabelScalePosition | Pie chart label position factor
legend |  | SetLegend | Legend text array. Each index is a legend text line.
legend_bg_color |  | SetLegendBgColor | Color (R,G,B,A) for the legend background (Added in PHPlot-6.0.0)
legend_colorbox_align | 'right' | SetLegendStyle | Alignment of color boxes or shape markers in the legend: left, right, or none
legend_colorbox_borders | 'textcolor' | SetLegendColorboxBorders | Color control for colorbox borders in legend (Added in PHPlot-6.0.0)
legend_colorbox_width | 1.0 | DrawLegend | Adjusts width of color boxes in the legend (See Tuning Parameters for more) (Added in PHPlot-5.3.0)
legend_pos |  | SetLegendPosition | Array holding legend position information (Added in PHPlot-5.4.0) (See notes for more)
legend_reverse_order | FALSE | SetLegendReverse | Flag: reverse the order of lines in the legend box, bottom to top (Added in PHPlot-5.5.0)
legend_text_align | 'right' | SetLegendStyle | Legend style setting, left or right
legend_text_color |  | SetLegendTextColor | Color (R,G,B,A) for the legend text (Added in PHPlot-6.0.0)
legend_use_shapes | FALSE | SetLegendUseShapes | Draw color boxes (if false or unset) or shape markers (if true) in the legend (Added in PHPlot-5.4.0)
light_grid_color |  | SetLightGridColor | Color (R,G,B,A) for grid lines and X data lines
line_spacing | 4 | SetLineSpacing | Controls inter-line spacing of text
line_styles | array(...) | SetLineStyles | Plot line style(s)
line_widths | 1 | SetLineWidths | Plot line width(s)
locale_override | FALSE | number_format | Flag to avoid importing locale info (See Tuning Parameters for more)
max_x |  | FindDataLimits | Overall max X value in the data array
max_y |  | FindDataLimits | Overall max Y value in the data array
max_z |  | FindDataLimits | Overall max Z value in the data array (for X/Y/Z data type only) (Added in PHPlot-5.5.0)
min_x |  | FindDataLimits | Overall min X value in the data array
min_y |  | FindDataLimits | Overall min Y value in the data array
min_z |  | FindDataLimits | Overall min Z value in the data array (for X/Y/Z data type only) (Added in PHPlot-5.5.0)
ndx_bg_color |  | SetColorIndexes | Color index of image background
ndx_data_border_colors |  | SetColorIndexes | Color index array for bar chart data borders
ndx_data_colors |  | SetColorIndexes | Color index array for plot data lines/marks/bars/etc.
ndx_data_dark_colors |  | NeedDataDarkColors | Color index array for plot data, darker shade
ndx_datalabel_color |  | SetColorIndexes | Color index for axis data labels (Added in PHPlot-5.7.0)
ndx_dvlabel_color |  | SetColorIndexes | Color index for data value labels (Added in PHPlot-5.7.0)
ndx_error_bar_colors |  | NeedErrorBarColors | Color index array for error bars
ndx_grid_color |  | SetColorIndexes | Color index for axes, plot area border, legend border, pie chart lines and text
ndx_i_border |  | SetColorIndexes | Color index for image border lines
ndx_i_border_dark |  | SetColorIndexes | Color index for image border lines, darker shade
ndx_legend_bg_color |  | SetColorIndexes | Color index for the legend background (Added in PHPlot-6.0.0)
ndx_legend_text_color |  | SetColorIndexes | Color index for the legend text (Added in PHPlot-6.0.0)
ndx_light_grid_color |  | SetColorIndexes | Color index for grid lines and X data lines
ndx_pieborder_color |  | SetColorIndexes | Color index for unshaded pie chart segment borders (Added in PHPlot-6.0.0)
ndx_pielabel_color |  | SetColorIndexes | Color index for pie chart data labels (Added in PHPlot-5.7.0)
ndx_plot_bg_color |  | SetColorIndexes | Color index of plot area background
ndx_text_color |  | SetColorIndexes | Color index for labels and legend text
ndx_tick_color |  | SetColorIndexes | Color index for tick marks
ndx_ticklabel_color |  | SetColorIndexes | Color index for tick labels (Added in PHPlot-5.7.0)
ndx_title_color |  | SetColorIndexes | Color index for main title
ndx_x_title_color |  | SetColorIndexes | Color index for X title (Added in PHPlot-5.2.0)
ndx_y_title_color |  | SetColorIndexes | Color index for Y title (Added in PHPlot-5.2.0)
num_data_rows |  | SetDataValues | Number of rows in the data array (number of points along X, or number of bar groups, for example)
num_recs |  | SetDataValues | Array with number of entries in each data row (including label and X if present)
num_x_ticks | '' | SetNumXTicks | Forced number of X tick marks
num_y_ticks | '' | SetNumYTicks | Forced number of Y tick marks
ohlc_frac_width | 0.3 | DrawOHLC | Scale factor for element widths in OHLC plots. Default is 0.3, meaning within min and max limits the elements will use 30% of the available space for half their width. (See Tuning Parameters for more) (Added in PHPlot-5.3.0)
ohlc_max_width | 8 | DrawOHLC | Maximum half-width for elements in OHLC plots (candlestick bodies or tick pairs). Default is 8 pixels. (See Tuning Parameters for more) (Added in PHPlot-5.3.0)
ohlc_min_width | 2 | DrawOHLC | Minimum half-width for elements in OHLC plots (candlestick bodies or tick pairs). Default is 2 pixels. (See Tuning Parameters for more) (Added in PHPlot-5.3.0)
output_file |  | SetOutputFile | Redirect to output file
pie_diam_factor | 0.5 | DrawPieChart | Aspect ratio for shaded pie charts. (See Tuning Parameters for more) (Added in PHPlot-5.6.0)
pie_direction_cw | FALSE | SetPieDirection | Flag: If true, pie chart segments are drawn in clockwise direction. If false or unset, they are counter-clockwise. (Added in PHPlot-6.0.0)
pie_full_size | FALSE | SetPieAutoSize | Flag: If true, do not include label sizes when calculating pie size. (Added in PHPlot-5.6.0)
pie_label_source |  | SetPieLabelType | Source of label text for pie charts (percent, value, label, or index) (Added in PHPlot-5.6.0)
pie_min_size_factor | 0.5 | DrawPieChart | Minimum amount of the plot area that will be reserved for the pie (See Tuning Parameters for more) (Added in PHPlot-5.6.0)
pie_start_angle | 0 | SetPieStartAngle | Starting angle in degrees for the first segment in a pie chart. (Added in PHPlot-6.0.0)
pieborder_color |  | SetPieBorderColor | Color (R,G,B,A) to use for unshaded pie chart segment borders (Added in PHPlot-6.0.0)
pielabel_color |  | SetPieLabelColor | Color (R,G,B,A) to use for pie chart data labels (Added in PHPlot-5.7.0)
plot_area |  | CalcPlotAreaPixels | Array defining the calculated plot area. ([0],[1]) is the top left corner, ([2],[3]) is the bottom right corner.
plot_area_height |  | CalcPlotAreaPixels | Height of the plot area
plot_area_width |  | CalcPlotAreaPixels | Width of the plot area
plot_bg_color |  | SetPlotBgColor | Color (R,G,B,A) for plot area background
plot_border_type |  | SetPlotBorderType | Where to draw plot borders. Can be scalar or array of choices.
plot_max_x |  | SetPlotAreaWorld, CalcPlotAreaWorld | Max X of the plot area in world coordinates
plot_max_y |  | SetPlotAreaWorld, CalcPlotAreaWorld | Max Y of the plot area in world coordinates
plot_min_x |  | SetPlotAreaWorld, CalcPlotAreaWorld | Min X of the plot area in world coordinates
plot_min_y |  | SetPlotAreaWorld, CalcPlotAreaWorld | Min Y of the plot area in world coordinates
plot_origin_x |  | CalcTranslation | X device coordinate of the plot area origin
plot_origin_y |  | CalcTranslation | Y device coordinate of the plot area origin
plot_type | 'linepoints' | SetPlotType | Selected plot type
plotbgimg |  | SetPlotAreaBgImage | Plot area background image filename
plotbgmode |  | SetPlotAreaBgImage | Plot area background image tiling mode
plots | array(...) | DrawGraph, SetPlotType, FindDataLimits | Static array of plot type information (Added in PHPlot-5.3.0) (See notes for more)
point_counts |  | CheckPointParams | Size of point_shapes and point_sizes arrays (added in PHPlot-5.1.0)
point_shapes | array(...) | SetPointShapes | Marker shapes for point plots
point_sizes | array(6) | SetPointSizes | Marker sizes for point plots
print_image | TRUE | SetPrintImage | Flag: Automatic PrintImage after DrawGraph?
rangectl | array(...) | TuneXAutoRange, TuneYAutoRange, TuneAutoRange | Tuning parameters for plot range calculation (Added in PHPlot-6.0.0) (See notes for more)
record_bar_width |  | CalcBarWidths | Area for each bar in a bar chart
records_per_group |  | SetDataValues | Maximum of num_recs[], max number of entries (including label and X if present) for all data rows
rgb_array |  | SetRGBArray | Array mapping color names to array of R, G, B values
safe_margin | 5 |  | Fixed extra margin used in multiple places (See Tuning Parameters for more)
saved_version |  | __sleep, __wakeup | Stores PHPlot version when object was serialized
shading | 5 | SetShading | Drop shadow size for pie and bar charts
skip_bottom_tick | FALSE | SetSkipBottomTick | Skip bottom tick mark
skip_left_tick | FALSE | SetSkipLeftTick | Skip left tick mark
skip_right_tick | FALSE | SetSkipRightTick | Skip right tick mark
skip_top_tick | FALSE | SetSkipTopTick | Skip top tick mark
stream_boundary |  | StartStream | MIME boundary sequence used with streaming plots (added in PHPlot-5.8.0)
stream_frame_header |  | StartStream | Boundary and MIME header, output before each frame in a plot stream (added in PHPlot-5.8.0)
stream_output_f |  | StartStream | Name of the GD output function for this image type, used with streaming plots (added in PHPlot-5.8.0)
suppress_error_image | FALSE | SetFailureImage | Flag: Don't produce an error image on fatal error. Unset is FALSE. (Note the flag value is the negation of the function argument). (Added in PHPlot-5.5.0)
suppress_x_axis | FALSE | SetDrawXAxis | Flag: Don't draw the X axis line. Unset (by default) means FALSE. (Added in PHPlot-5.3.0)
suppress_y_axis | FALSE | SetDrawYAxis | Flag: Don't draw the Y axis line. Unset (by default) means FALSE. (Added in PHPlot-5.3.0)
text_color |  | SetTextColor | Color (R,G,B,A) for labels and legend text
thousands_sep |  | SetNumberFormat | Character to use to group 1000s in formatted numbers
tick_color |  | SetTickColor | Color (R,G,B,A) for tick marks
tickctl | array(...) | TuneXAutoTicks, TuneYAutoTicks, TuneAutoTicks | Tuning parameters for tick increment calculation (Added in PHPlot-6.0.0) (See notes for more)
ticklabel_color |  | SetTickLabelColor | Color (R,G,B,A) to use for tick labels (Added in PHPlot-5.7.0)
title_color |  | SetTitleColor | Color (R,G,B,A) for main title (and default for X and Y titles)
title_offset |  | CalcMargins | Y offset of main title position (Added in PHPlot-5.1.2)
title_txt | '' | SetTitle | Main title text
total_records |  | SetDataValues | Total number of entries (rows times columns in each row) in the data array.
transparent_color |  | SetTransparentColor | Color (R,G,B,A) designated as transparent (Added in PHPlot-5.2.0)
truecolor |  | __sleep, __wakeup | Flag: True if serialized object had a truecolor image
ttf_path | '.' | SetTTFPath | TrueType font directory
use_ttf | FALSE | SetUseTTF | Default font type, True for TrueType, False for GD
x_axis_position |  | SetXAxisPosition | Position of X axis (in world coordinates)
x_axis_y_pixels |  | CalcTranslation | Device coordinate for the X axis
x_data_label_angle |  | CheckLabels | Effective X data label text angle (Added in PHPlot-5.1.0)
x_data_label_angle_u | '' | SetXDataLabelAngle | X data label text angle (see also x_data_label_angle) (Added in PHPlot-6.0.0)
x_data_label_pos |  | SetXDataLabelPos | Position of X data labels. (Default was 'plotdown', but is now applied at graph drawing time.)
x_label_angle | 0 | SetXLabelAngle | X tick label text angle (and default for x_data_label_angle)
x_label_axis_offset |  | CalcMargins | Label offset relative to plot area
x_label_bot_offset |  | CalcMargins | Label offset relative to plot area
x_label_top_offset |  | CalcMargins | Label offset relative to plot area
x_left_margin |  | CalcMargins | Calculated plot area margin - left side
x_right_margin |  | CalcMargins | Calculated plot area margin - right side
x_tick_anchor |  | SetXTickAnchor | X tick anchor point (Added in PHPlot-5.4.0)
x_tick_cross | 3 | SetXTickCrossing | Length of X tick marks (inside plot area)
x_tick_inc |  | CalcPlotAreaWorld | Effective step between X tick marks. This is equal to x_tick_inc_u if SetXTickIncrement was used, else a calculated value.
x_tick_inc_u | '' | SetXTickIncrement | Step between X tick marks (see also x_tick_inc) (Added in PHPlot-6.0.0)
x_tick_label_pos |  | SetXTickLabelPos | Position of X tick labels. (Default was 'plotdown', but is now applied at graph drawing time.)
x_tick_length | 5 | SetXTickLength | Length of X tick marks (outside plot area)
x_tick_pos | 'plotdown' | SetXTickPos | Position of X tick marks
x_title_bot_offset |  | CalcMargins | Title offset relative to plot area
x_title_color |  | SetXTitleColor | Color (R,G,B,A) for X title (Added in PHPlot-5.2.0)
x_title_pos | 'none' | SetXTitle | X Axis title position
x_title_top_offset |  | CalcMargins | Title offset relative to plot area
x_title_txt | '' | SetXTitle | X Axis title text
xscale |  | CalcTranslation | X scale factor for converting World to Device coordinates
xscale_type | 'linear' | SetXScaleType | Linear or log scale on X
y_axis_position |  | SetYAxisPosition | Position of Y axis (in world coordinates)
y_axis_x_pixels |  | CalcTranslation | Device coordinate for the Y axis
y_bot_margin |  | CalcMargins | Calculated plot area margin - bottom
y_data_label_angle | 0 | SetYDataLabelAngle | Y data label text angle (Added in PHPlot-5.1.0)
y_data_label_pos |  | SetYDataLabelPos, CheckLabels | Position of Y labels above bars
y_label_angle | 0 | SetYLabelAngle | Y tick label text angle
y_label_axis_offset |  | CalcMargins | Label offset relative to plot area
y_label_left_offset |  | CalcMargins | Label offset relative to plot area
y_label_right_offset |  | CalcMargins | Label offset relative to plot area
y_tick_anchor |  | SetYTickAnchor | Y tick anchor point (Added in PHPlot-5.4.0)
y_tick_cross | 3 | SetYTickCrossing | Length of Y tick marks (inside plot area)
y_tick_inc |  | CalcPlotAreaWorld | Effective step between Y tick marks. This is equal to y_tick_inc_u if SetYTickIncrement was used, else a calculated value.
y_tick_inc_u | '' | SetYTickIncrement | Step between Y tick marks (see also y_tick_inc) (Added in PHPlot-6.0.0)
y_tick_label_pos |  | SetYTickLabelPos, CheckLabels | Position of Y tick labels
y_tick_length | 5 | SetYTickLength | Length of Y tick marks (outside plot area)
y_tick_pos | 'plotleft' | SetYTickPos | Position of Y tick marks
y_title_color |  | SetYTitleColor | Color (R,G,B,A) for Y title (Added in PHPlot-5.2.0)
y_title_left_offset |  | CalcMargins | Title offset relative to plot area
y_title_pos | 'none' | SetYTitle | Y Axis title position
y_title_right_offset |  | CalcMargins | Title offset relative to plot area
y_title_txt | '' | SetYTitle | Y Axis title text
y_top_margin |  | CalcMargins | Calculated plot area margin - top
yscale |  | CalcTranslation | Y scale factor for converting World to Device coordinates
yscale_type | 'linear' | SetYScaleType | Linear or log scale on Y

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