;; Issues
;;

(module (s9fes char-canvas shape cross)

(;export
  ;
  shape-cross--
  |shape-cross-\||
  shape-cross-+
  ;
  |shape-cross-\\|
  shape-cross-/
  shape-cross-x
  ;
  virtual-shape-cross--
  |virtual-shape-cross-\||
  virtual-shape-cross-+
  ;
  |virtual-shape-cross-\\|
  virtual-shape-cross-/
  virtual-shape-cross-x)

(import scheme utf8)
(import (chicken base))
(import (chicken fixnum))
(import (chicken type))
(import (s9fes char-canvas))

(include-relative "s9fes.char-canvas.types")

(: shape-cross-- (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: |shape-cross-\|| (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: shape-cross-+ (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))

(: |shape-cross-\\| (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: shape-cross-/ (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: shape-cross-x (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))

(: virtual-shape-cross-- (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: |virtual-shape-cross-\|| (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: virtual-shape-cross-+ (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))

(: |virtual-shape-cross-\\| (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: virtual-shape-cross-/ (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))
(: virtual-shape-cross-x (fixnum #!optional fixnum plotter-config-arg -> shape-plotter))

;;

(define (cross-shape-args loc wd ht cfg n)
  (let* ((cfg (validate-plotter-configuration loc cfg n))
         (mx (fx- wd 1)) (my (fx- ht 1))
         (c1 (car cfg)) (c2 (if (fx= 1 n) c1 (cadr cfg)))
         (wd/2 (fx/ (fx+ wd 1) 2)) (ht/2 (fx/ (fx+ ht 1) 2))
         (xm0 (fx+ wd/2 -1)) (ym0 (fx+ ht/2 -1)) )
    (values c1 c2 mx my xm0 ym0 cfg) ) )

(define (shape-cross-- wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'shape-cross-- wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let ((x0 (fx- xm xm0)) (y0 (fx- ym ym0)))
            (when c1 (canvas-draw-line cv x0 ym (fx+ x0 mx) ym c1)) ) ) ) ) )

(define (|shape-cross-\|| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args '|shape-cross-\|| wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let ((x0 (fx- xm xm0)) (y0 (fx- ym ym0)))
            (when c2 (canvas-draw-line cv xm (fx+ y0 my) xm y0 c2)) ) ) ) ) )

(define (shape-cross-+ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'shape-cross-+ wd ht cfg 2)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let ((x0 (fx- xm xm0)) (y0 (fx- ym ym0)))
            (when c1 (canvas-draw-line cv x0 ym (fx+ x0 mx) ym c1))
            (when c2 (canvas-draw-line cv xm (fx+ y0 my) xm y0 c2)) ) ) ) ) )

(define (|shape-cross-\\| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args '|shape-cross-\\| wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let* ((x0 (fx- xm xm0)) (y0 (fx- ym ym0))
                 (x1 (fx+ x0 mx)) (y1 (fx+ y0 my)) )
            (when c1 (canvas-draw-line cv x0 y1 x1 y0 c1))) ) ) ) )

(define (shape-cross-/ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'shape-cross-/ wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let* ((x0 (fx- xm xm0)) (y0 (fx- ym ym0))
                 (x1 (fx+ x0 mx)) (y1 (fx+ y0 my)) )
            (when c2 (canvas-draw-line cv x0 y0 x1 y1 c2)) ) ) ) ) )

(define (shape-cross-x wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'shape-cross-+ wd ht cfg 2)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if (not cv) (list wd ht cfg)
          (let* ((x0 (fx- xm xm0)) (y0 (fx- ym ym0))
                 (x1 (fx+ x0 mx)) (y1 (fx+ y0 my)) )
            (when c1 (canvas-draw-line cv x0 y1 x1 y0 c1))
            (when c2 (canvas-draw-line cv x0 y0 x1 y1 c2)) ) ) ) ) )

;;

(define (virtual-cross-shape-args loc wd ht cfg n)
  (values (+ (floor (/ wd 2)) -1) ;x
          (+ (floor (/ ht 2)) -1) ;y
          ;extra work but better error
          (validate-plotter-configuration loc cfg n)) )

(define (virtual-shape-cross-- wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'virtual-shape-cross-- wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (shape-cross-- pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

(define (|virtual-shape-cross-\|| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args '|virtual-shape-cross-\|| wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (|shape-cross-\|| pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

(define (virtual-shape-cross-+ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'virtual-shape-cross-+ wd ht cfg 2)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (shape-cross-+ pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

(define (|virtual-shape-cross-\\| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args '|virtual-shape-cross-\\| wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (|shape-cross-\\| pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

(define (virtual-shape-cross-/ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'virtual-shape-cross-/ wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (shape-cross-/ pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

(define (virtual-shape-cross-x wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'virtual-shape-cross-x wd ht cfg 2)
    ;wait until have a canvas
    (let ((plotter (the (or false shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if (not cv) (list wd ht cfg)
            (begin
              (unless plotter
                (receive (pwd pht) (canvas-physical cv wd ht)
                  (set! plotter (shape-cross-x pwd pht cfg)) ) )
              (receive (pxm0 pym0) (canvas-physical cv xm0 ym0)
                (plotter cv pxm0 pym0)) ) ) ) ) ) )

) ;module (s9fes char-canvas shape cross)