Vvidget Server ► Dictionary ► Area Graph
This section explains how to form an input string for an area graph such as these:
| Format | |
| Type-1, area_color=ff0000 | Type-1, no area_color |
| Type-2, area_color=ffff00 | Type-2, no area_color |
The input string has this form:
chart_type=2&chart_subtype=0&chart_format_type=2&title=string&x_title=string&y_title=string&data_1=x1 y1 x2 y2 ... xN yN&data_2=x1 y1 x2 y2 ... xN yN&data_3=x1 y1 x2 y2 ... xN yN&area_color=RRGGBBAA&templates=string
The following table defines the input string key and value pairs:
| Chart Specific Entries | |
| Key | Value Description |
| chart_type¹ | The chart type is always 2 (aliased to area), indicating an area graph. |
| chart_subtype¹ | one of {0, 1, 2, 3} (aliased to {linear , semilog, x-log y-linear, log-log}) for {X-Linear, Y-Linear}, {X-Linear, Y-Log}, {X-Log, Y-Linear} or {X-Log, Y-Log} respectively. |
| chart_format_type¹ | An index from 1 to 2 as shown above (1 is aliased to default). |
| title | The main title of the graph. If this key is not present then the template's title is used. |
| x_title | The x title of the graph. If this key is not present then the template's x-title is used. |
| y_title | The y title of the graph. If this key is not present then the template's y-title is used. |
| data_I | A white space delimited list of values representing the x and y values of points in a sequence for curve index I where I starts at 1. See Data Oriented keys for additional information and keys. |
| label_I | A string for the I-th x-label value. I starts at 1. NOTE: If any label key is present then the data x-values are assumed unitless and an arbitrary unit must be assigned. The x-axis minimum starts at zero and runs to (N-1), where N is the maximum label index. To place a data point at each label x-value the data x-values should be the sequence {0, 1, 2, ..., (N-1)} but you may also choose to skip locations where a label is, etc. |
| area_color | A hex encoded representation of a RGBA color value for the area fill color. If this key is not present then the color table template is used. |
| templates | A custom Templates directory. |
If you incorporate this functionality into your web site please consult Web URL.
You can also modify the following Templates:
| Template Document Names | |
| Template | Description |
| PVST_Area_Graph | Forms the static attributes for the X-Linear, Y-Linear graph. |
| PVST_X_Log_Area_Graph | Forms the static attributes for the X-Log, Y-Linear graph. |
| PVST_Y_Log_Area_Graph | Forms the static attributes for the X-Linear, Y-Log graph. |
| PVST_XY_Log_Area_Graph | Forms the static attributes for the X-Log, Y-Log graph. |
| PVST_area_color_table | Forms the area colors for odd format type indices. |
| PVST_area_color_table_1 | Forms the area colors for even format type indices. |
This Area graph image maker inherits the Vvidget prototype definitions of the Line Graph image maker.
The following Server Side Attributes define additional non-graphic attributes. A file with this name in the templates directory will alter the parameters that appear in the attribute file.
| Server Side Attributes Names | |
| Name | Description |
| PVST_Area_Graph_attributes | Main server side attributes. |