pointArray_svg_rel()

static void pointArray_svg_rel ( stringbuffer_t *  sb, const POINTARRAY *  pa, int  close_ring, int  precision, int  start_at_index  )

static

Definition at line 44 of file lwout_svg.c.

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

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

Referenced by assvg_compound(), assvg_line(), and assvg_polygon().

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