/visualize/image/chart

URL: http://GPUDB_IP_ADDRESS:GPUDB_PORT/visualize/image/chart

Scatter plot is the only plot type currently supported. A non-numeric column can be specified as x or y column and jitters can be added to them to avoid excessive overlapping. All color values must be in the format RRGGBB or AARRGGBB (to specify the alpha value). The image is contained in the output parameter image_data field.

Input Parameter Description

Name	Type	Description
table_name	string	Name of the table containing the data to be drawn as a chart.
x_column_names	array of strings	Names of the columns containing the data mapped to the x axis of a chart.
y_column_names	array of strings	Names of the columns containing the data mapped to the y axis of a chart.
min_x	double	Lower bound for the x column values. For non-numeric x column, each x column item is mapped to an integral value starting from 0.
max_x	double	Upper bound for the x column values. For non-numeric x column, each x column item is mapped to an integral value starting from 0.
min_y	double	Lower bound for the y column values. For non-numeric y column, each y column item is mapped to an integral value starting from 0.
max_y	double	Upper bound for the y column values. For non-numeric y column, each y column item is mapped to an integral value starting from 0.
width	int	Width of the generated image in pixels.
height	int	Height of the generated image in pixels.
bg_color	string	Background color of the generated image.
style_options	map of string to arrays of strings	Rendering style options for a chart. Supported Parameters (keys) Parameter Description pointcolor The color of points in the plot represented as a hexadecimal number. The default value is '0000FF'. pointsize The size of points in the plot represented as number of pixels. The default value is '3'.The minimum allowed value is 0. The maximum allowed value is 20. pointshape The shape of points in the plot. The default value is square. The supported values are: none circle square diamond hollowcircle hollowsquare hollowdiamond cb_pointcolors Point color class break information consisting of three entries: class-break attribute, class-break values/ranges, and point color values. This option overrides the pointcolor option if both are provided. Class-break ranges are represented in the form of "min:max". Class-break values/ranges and point color values are separated by cb_delimiter, e.g. {"price", "20:30;30:40;40:50", "0xFF0000;0x00FF00;0x0000FF"}. cb_pointsizes Point size class break information consisting of three entries: class-break attribute, class-break values/ranges, and point size values. This option overrides the pointsize option if both are provided. Class-break ranges are represented in the form of "min:max". Class-break values/ranges and point size values are separated by cb_delimiter, e.g. {"states", "NY;TX;CA", "3;5;7"}. cb_pointshapes Point shape class break information consisting of three entries: class-break attribute, class-break values/ranges, and point shape names. This option overrides the pointshape option if both are provided. Class-break ranges are represented in the form of "min:max". Class-break values/ranges and point shape names are separated by cb_delimiter, e.g. {"states", "NY;TX;CA", "circle;square;diamond"}. cb_delimiter A character or string which separates per-class values in a class-break style option string. The default value is ';'. x_order_by An expression or aggregate expression by which non-numeric x column values are sorted, e.g. "avg(price) descending". y_order_by An expression or aggregate expression by which non-numeric y column values are sorted, e.g. "avg(price)", which defaults to "avg(price) ascending". scale_type_x Type of x axis scale. The default value is none. Supported List Entries Description none No scale is applied to the x axis. log A base-10 log scale is applied to the x axis. scale_type_y Type of y axis scale. The default value is none. Supported List Entries Description none No scale is applied to the y axis. log A base-10 log scale is applied to the y axis. min_max_scaled If this options is set to "false", this endpoint expects request's min/max values are not yet scaled. They will be scaled according to scale_type_x or scale_type_y for response. If this options is set to "true", this endpoint expects request's min/max values are already scaled according to scale_type_x/scale_type_y. Response's min/max values will be equal to request's min/max values. The default value is 'false'. jitter_x Amplitude of horizontal jitter applied to non-numeric x column values. The default value is '0.0'.The minimum allowed value is 0.0. The maximum allowed value is 1.0. jitter_y Amplitude of vertical jitter applied to non-numeric y column values. The default value is '0.0'.The minimum allowed value is 0.0. The maximum allowed value is 1.0. plot_all If this options is set to "true", all non-numeric column values are plotted ignoring min_x, max_x, min_y and max_y parameters. The default value is 'false'.
options	map of string to strings	Optional parameters. The default value is an empty map ( {} ). Supported Parameters (keys) Parameter Description image_encoding Encoding to be applied to the output image. When using JSON serialization it is recommended to specify this as base64. The default value is none. Supported Values Description base64 Apply base64 encoding to the output image. none Do not apply any additional encoding to the output image.

Output Parameter Description

The GPUdb server embeds the endpoint response inside a standard response structure which contains status information and the actual response to the query. Here is a description of the various fields of the wrapper:

Name	Type	Description
status	String	'OK' or 'ERROR'
message	String	Empty if success or an error message
data_type	String	'visualize_image_chart_request' or 'none' in case of an error
data	String	Empty string
data_str	JSON or String	This embedded JSON represents the result of the /visualize/image/chart endpoint: Name Type Description min_x double Lower bound for the x column values as provided in input parameter min_x or calculated for non-numeric columns when plot_all option is used. max_x double Upper bound for the x column values as provided in input parameter max_x or calculated for non-numeric columns when plot_all option is used. min_y double Lower bound for the y column values as provided in input parameter min_y or calculated for non-numeric columns when plot_all option is used. max_y double Upper bound for the y column values as provided in input parameter max_y or calculated for non-numeric columns when plot_all option is used. width int Width of the image as provided in input parameter width. height int Height of the image as provided in input parameter height. bg_color string Background color of the image as provided in input parameter bg_color. image_data bytes The generated image data. axes_info map of string to arrays of strings Information returned for drawing labels for the axes associated with non-numeric columns. Possible Parameters (keys) Parameter Description sorted_x_values Sorted non-numeric x column value list for drawing x axis label. location_x X axis label positions of sorted_x_values in pixel coordinates. sorted_y_values Sorted non-numeric y column value list for drawing y axis label. location_y Y axis label positions of sorted_y_values in pixel coordinates. info map of string to strings Additional information. Empty string in case of an error.