#lang racket/base

(require racket/match

"../common/math.rkt")

(provide (all-defined-out))

(struct shape (alpha center layer) #:transparent)

(struct polygon shape (vs normal pen-color pen-width pen-style brush-color brush-style) #:transparent)

(struct rectangle shape (rect pen-color pen-width pen-style brush-color brush-style) #:transparent)

(struct line shape (v1 v2 pen-color pen-width pen-style) #:transparent)

(struct text shape (anchor angle dist str font-size font-family color outline?) #:transparent)

(struct glyph shape (symbol size pen-color pen-width pen-style brush-color brush-style) #:transparent)

(struct tick-glyph shape (radius angle pen-color pen-width pen-style) #:transparent)

(struct arrow-glyph shape (start end pen-color pen-width pen-style) #:transparent)

(struct shapes shape (list) #:transparent)

(define (draw-before? cs1 cs2)

(match-define (cons s1 (vector x1 y1 z1)) cs1)

(match-define (cons s2 (vector x2 y2 z2)) cs2)

(define l1 (shape-layer s1))

(define l2 (shape-layer s2))

(or (l1 . > . l2)

(and (l1 . = . l2)

(or (y1 . > . y2)

(and (y1 . = . y2)

(if (z1 . = . z2)

(and (polygon? s1) (not (polygon? s2)))

(z1 . < . z2)))))))

(define (depth-sort s+cs)

(sort s+cs draw-before?))