pointArray_svg_rel()

static size_t pointArray_svg_rel ( POINTARRAY *  pa, char *  output, int  close_ring, int  precision  )

static

Definition at line 550 of file lwout_svg.c.

{
        int i, end;
        char *ptr;
        char sx[OUT_DOUBLE_BUFFER_SIZE];
        char sy[OUT_DOUBLE_BUFFER_SIZE];
        const POINT2D *pt;
 
        double f = 1.0;
        double dx, dy, x, y, accum_x, accum_y;
 
        ptr = output;
 
        if (precision >= 0)
        {
                f = pow(10, precision);
        }
 
        if (close_ring) end = pa->npoints;
        else end = pa->npoints - 1;
 
        /* Starting point */
        pt = getPoint2d_cp(pa, 0);
 
        x = round(pt->x*f)/f;
        y = round(pt->y*f)/f;
 
        lwprint_double(x, precision, sx, OUT_DOUBLE_BUFFER_SIZE);
        lwprint_double(-y, precision, sy, OUT_DOUBLE_BUFFER_SIZE);
        ptr += sprintf(ptr,"%s %s l", sx, sy);
 
        /* accum */
        accum_x = x;
        accum_y = y;
 
        /* All the following ones */
        for (i=1 ; i < end ; i++)
        {
                // lpt = pt;
 
                pt = getPoint2d_cp(pa, i);
 
                x = round(pt->x*f)/f;
                y = round(pt->y*f)/f;
                dx = x - accum_x;
                dy = y - accum_y;
 
                lwprint_double(dx, precision, sx, OUT_DOUBLE_BUFFER_SIZE);
                lwprint_double(-dy, precision, sy, OUT_DOUBLE_BUFFER_SIZE);
 
                accum_x += dx;
                accum_y += dy;
 
                ptr += sprintf(ptr," %s %s", sx, sy);
        }
 
        return (ptr-output);
}

References getPoint2d_cp(), lwprint_double(), POINTARRAY::npoints, OUT_DOUBLE_BUFFER_SIZE, precision, POINT2D::x, and POINT2D::y.

Referenced by assvg_line_buf(), and assvg_polygon_buf().

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