/*
 * Draw a rounded edge in one quadrant
 *
 * Draw a arc from corner point vc plus rector ra to vc+rb. vc+ra is stored
 * in va and vc+rb is stored in vb.
 */

#define	Q(va, vb, vc, ra, rb)		\
    va: vec vc ra;			\
    vb: vec vc rb;			\
    vc##_center: vec va rb;		\
    arc vc##_center va vb

/*
 * Rectangle with rounded corners.
 *
 * pfx is the prefix for all the names generated by this macro. origin is the
 * lower left corner. w and h are the width and height. r is the radius of the
 * corners.
 */

#define RRECT_SETUP(pfx, origin, w, h, r)			\
    pfx##ll: vec origin(0mm, 0mm);				\
    pfx##lr: vec pfx##ll(w, 0mm);				\
    pfx##ul: vec pfx##ll(0mm, h);				\
    pfx##ur: vec pfx##ll(w, h);					\
    Q(pfx##lly, pfx##llx, pfx##ll, (0mm, r), (r, 0mm));		\
    Q(pfx##lrx, pfx##lry, pfx##lr, (-r, 0mm), (0mm, r));	\
    Q(pfx##ulx, pfx##uly, pfx##ul, (r, 0mm), (0mm, -r));	\
    Q(pfx##ury, pfx##urx, pfx##ur, (0mm, -r), (-r, 0mm))

#define RRECT_DRAW_LINES(pfx)	\
    line pfx##llx pfx##lrx;	\
    line pfx##ulx pfx##urx;	\
    line pfx##lly pfx##uly;	\
    line pfx##lry pfx##ury

#define	RRECT(pfx, origin, w, h, r)	\
    RRECT_SETUP(pfx, origin, w, h, r);	\
    RRECT_DRAW_LINES(pfx)


/* ----- Top part ---------------------------------------------------------- */


frame top_outline {
	RRECT(edge_, @, width, length, ro_edge)
}

frame top_window {
	loop if = 1, top_window

	set off = topborder+topridge

	frame top_outline @

	win_orig: vec @(off+pcbgap+win_x0, off)
	RRECT(win_, win_orig, win_x1-win_x0, length-2*off, win_r)

	cmp_orig: vec @(off+pcbgap+cmp_x0, off+pcbgap+cmp_y0)
	RRECT(cmp_, cmp_orig, cmp_x1-cmp_x0, cmp_y1-cmp_y0, cmp_r)
}

frame top_pcb {
	loop if = 1, top_pcb

	set off = topborder+topridge

	frame top_outline @
	ll: vec @(off, off)
	RRECT(pcb_, ll, width-2*off, length-2*off, ri_ridge)
}

frame top_ridge {
	loop if = 1, top_ridge

	set inside = topborder+topridge

	ro: vec @(topborder, topborder)
	RRECT(ridge_o_, ro, width-2*topborder, length-2*topborder, ro_ridge)
	ri: vec ro(topridge, topridge)
	RRECT(ridge_i_, ri, width-2*inside, length-2*inside, ri_ridge)
}

frame top_surface {
	loop if = 1, top_surface

	frame top_outline @
}


/* ----- Main -------------------------------------------------------------- */


package "top-$part-$z"
unit mm

table
    { part,		z, top_surface, top_window, top_pcb, top_ridge }
    { "top_surface",	2.5, 1, 0, 0, 0 }
    { "top_window",	1.5, 0, 1, 0, 0 }
    { "top_pcb",	0.5, 0, 0, 1, 0 }
    { "top_ridge",	0,   0, 0, 0, 1 }

table
    { pcbw, pcbl, pcbgap }
    { 20mm, 45mm, 0.2mm }

table
    /* window position relative to left edge of PCB */
    { topridge, topborder, win_x0, win_x1, win_r }
    { 1.0mm,    1.0mm,     1.0mm,  5.0mm,  1.6mm }

table
    /* component area position relative to lower left corner of PCB */
    { cmp_x0, cmp_y0, cmp_x1, cmp_y1, cmp_r }
    { 7.0mm,  1.0mm,  20.0mm, 30.0mm, 2.0mm }

set width = pcbw+2*(pcbgap+topridge+topborder)
set length = pcbl+2*(pcbgap+topridge+topborder)

set ri_ridge = 2.0mm
set ro_ridge = ri_ridge+topridge

/*
 * ro_edge is an outer edge, so we can make the radius smaller than ro_ridge,
 * for added strength and less fruity esthetics.
 */

set ro_edge = 1.5mm

frame top_ridge @
frame top_pcb @
frame top_window @
frame top_surface @

measx top_outline.edge_ul -> top_outline.edge_ur 4mm
measy top_outline.edge_ll -> top_outline.edge_ul 4mm
measx top_pcb.pcb_ul -> top_pcb.pcb_ur 3mm
measy top_pcb.pcb_ll -> top_pcb.pcb_ul 3mm

measx top_ridge.ridge_o_ul -> top_ridge.ridge_o_ur 4mm
measy top_ridge.ridge_o_ll -> top_ridge.ridge_o_ul 4mm
measx top_ridge.ridge_i_ul -> top_ridge.ridge_i_ur 3mm
measy top_ridge.ridge_i_ll -> top_ridge.ridge_i_ul 3mm