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142 lines
2.6 KiB
C
142 lines
2.6 KiB
C
/***********************************************************************
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* pc_point.c
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*
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* Pointclound point handling. Create, get and set values from the
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* basic PCPOINT structure.
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*
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* Portions Copyright (c) 2012, OpenGeo
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*
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***********************************************************************/
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#include "pc_api_internal.h"
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PCPOINT *
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pc_point_new(const PCSCHEMA *s)
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{
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size_t sz;
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PCPOINT *pt;
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if ( ! s )
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{
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pcerror("null schema passed into pc_point_new");
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return NULL;
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}
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/* Width of the data area */
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sz = pc_schema_get_size(s);
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if ( ! sz )
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{
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pcerror("invalid size calculation in pc_point_new");
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return NULL;
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}
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/* Make our own data area */
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pt = pcalloc(sizeof(PCPOINT));
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pt->data = pcalloc(sz);
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/* Set up basic info */
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pt->schema = s;
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pt->readonly = PC_FALSE;
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return pt;
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};
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PCPOINT *
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pc_point_new_from_data(const PCSCHEMA *s, uint8_t *data)
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{
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size_t sz;
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PCPOINT *pt;
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if ( ! s )
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{
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pcerror("null schema passed into pc_point_new_from_data");
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return NULL;
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}
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/* Reference the external data */
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pt = pcalloc(sizeof(PCPOINT));
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pt->data = data;
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/* Set up basic info */
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pt->schema = s;
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pt->readonly = PC_TRUE;
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return pt;
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}
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static double
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pc_point_get_double(const PCPOINT *pt, const PCDIMENSION *d)
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{
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uint8_t *ptr;
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double val;
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/* Read raw value from byte buffer */
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ptr = pt->data + d->byteoffset;
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val = pc_double_from_ptr(ptr, d->interpretation);
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/* Scale value */
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if ( d->scale )
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val *= d->scale;
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/* Offset value */
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if ( d->offset )
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val += d->offset;
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return val;
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}
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double
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pc_point_get_double_by_name(const PCPOINT *pt, const char *name)
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{
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PCDIMENSION *d;
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d = pc_schema_get_dimension_by_name(pt->schema, name);
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return pc_point_get_double(pt, d);
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}
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double
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pc_point_get_double_by_idx(const PCPOINT *pt, uint32_t idx)
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{
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PCDIMENSION *d;
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d = pc_schema_get_dimension(pt->schema, idx);
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return pc_point_get_double(pt, d);
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}
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int
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pc_point_set_double(PCPOINT *pt, const PCDIMENSION *d, double val)
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{
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uint8_t *ptr;
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/* Offset value */
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if ( d->offset )
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val -= d->offset;
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/* Scale value */
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if ( d->scale )
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val /= d->scale;
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/* Get pointer into byte buffer */
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ptr = pt->data + d->byteoffset;
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return pc_double_to_ptr(ptr, d->interpretation, val);
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}
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int
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pc_point_set_double_by_idx(PCPOINT *pt, uint32_t idx, double val)
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{
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PCDIMENSION *d;
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d = pc_schema_get_dimension(pt->schema, idx);
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return pc_point_set_double(pt, d, val);
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}
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int
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pc_point_set_double_by_name(PCPOINT *pt, const char *name, double val)
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{
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PCDIMENSION *d;
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d = pc_schema_get_dimension_by_name(pt->schema, name);
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return pc_point_set_double(pt, d, val);
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}
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