Graph
[Trend]

Data Structures
struct	trd_graph_t
struct	trd_state_change_t
Typedefs
typedef trd_state_change_t	trd_state_change_t
typedef trd_graph_t	trd_graph_t
Functions
trd_graph_t *	trd_graph_create (long width, long height, apr_pool_t *pool)
sos_status_t *	trd_graph_status_find (trd_graph_t *graph, sul_key_t id)
void	trd_graph_render_basics (trd_graph_t *graph)
void	trd_graph_render_title (trd_graph_t *graph)
void	trd_graph_write (trd_graph_t *graph, char *file)
long	trd_graph_transform_x (trd_graph_t *graph, time_t x)
long	trd_graph_transform_y (trd_graph_t *graph, float y)
void	trd_graph_render_legend (trd_graph_t *graph)
void	trd_graph_render_grid (trd_graph_t *graph, short x, short y)
void	trd_graph_render_axii (trd_graph_t *graph)

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Typedef Documentation

typedef struct trd_graph_t trd_graph_t

Graph object storing properties and information for a graph that the trend grapher is generating.

typedef struct trd_state_change_t trd_state_change_t

Object representing a state change in the history of an object.

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Function Documentation

trd_graph_t* trd_graph_create (  long  width, long  height, apr_pool_t *  pool )

Creates a new Graph object. Parameters: width  Width of the graph's image. height  Height of the graph's image. pool  Pool to allocate memory overhead from. Returns: A graph object.

void trd_graph_render_axii (  trd_graph_t *  graph  )

Renders graph axii. Parameters: graph  A graph object.

void trd_graph_render_basics (  trd_graph_t *  graph  )

Renders the basic foundation onto the graph, including the background and the lovely border we wrap everything in. Used for every type of graph that this executable can make, its pretty important cause otherwise they look kind of funny. Parameters: graph  A graph object.

void trd_graph_render_grid (  trd_graph_t *  graph, short  x, short  y )

Renders a standard grid to the graph. Parameters: graph  A graph object. x  Flag indicating if the X axis should be done. y  Flag indicating if the Y axis should be done.

void trd_graph_render_legend (  trd_graph_t *  graph  )

Renders a legend to the graph, detailing the information that one can learn from her. Parameters: graph  A graph object.

void trd_graph_render_title (  trd_graph_t *  graph  )

Renders the title to the graph, read in from the graph objects title member variable. Parameters: graph  A graph object.

sos_status_t* trd_graph_status_find (  trd_graph_t *  graph, sul_key_t  id )

Locates a status object in the Graph with the given identifier, this avoid a query each time we need this. Parameters: graph  A graph object. id  Identifier of the status we're looking for. Returns: A status object with matching ID or NULL if one was unavailable.

long trd_graph_transform_x (  trd_graph_t *  graph, time_t  x )

Transforms an X coordinate in standard "data" space to the plotting area space. Parameters: graph  A graph object. x  X coordinate to transform. Returns: X coordinate for rendering.

long trd_graph_transform_y (  trd_graph_t *  graph, float  y )

Transforms an Y coordinate in standard "data" space to the plotting area space. Parameters: graph  A graph object. y  Y coordinate to transform. Returns: Y coordinate for rendering.

void trd_graph_write (  trd_graph_t *  graph, char *  file )

Writes the graph's image to a file as a PNG image. Parameters: graph  A graph object. file  File name to write the image to.

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