#include <string.h>
#include <grass/raster.h>
#include "globals.h"
#include "local_proto.h"

int Configure_view (
    View *view,
    char *name,
    char *mapset,
    double ns_res,
    double ew_res	/* original map resolution */
)
{
    Erase_view(view);
    view->cell.configured = 0;

/* copy the cell name into the view */
    strcpy (view->cell.name, name);
    strcpy (view->cell.mapset, mapset);

/* determine the map edges */
    view->cell.left   = view->left + (view->ncols - view->cell.head.cols)/2;
    view->cell.right  = view->cell.left + view->cell.head.cols - 1;
    view->cell.top    = view->top  + (view->nrows - view->cell.head.rows)/2;
    view->cell.bottom = view->cell.top + view->cell.head.rows - 1;

/* remember original resolutions */
    view->cell.ns_res = ns_res;
    view->cell.ew_res = ew_res;

    view->cell.configured = 1;

    return 0;
}

int 
In_view (View *view, int x, int y)
{
    return (x >= view->left && x <= view->right && y >= view->top && y <= view->bottom);
}

int 
Erase_view (View *view)
{
    R_standard_color (BLACK);
    R_box_abs (view->left, view->top, view->right, view->bottom);

    return 0;
}

double 
magnification (View *view)
{
    if (!view->cell.configured)
	return ((double) 0.0);
    return (view->cell.ew_res / view->cell.head.ew_res);
}