;; Issues
;;

(module (s9fes char-canvas shape cross)

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

(import scheme utf8)
(import (chicken base))
(import (chicken fixnum))
(import (chicken type))
(import record-variants)
(import (s9fes char-canvas)
        (s9fes char-canvas rect)
        (s9fes char-canvas shape shape))

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

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

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

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

(: |shape-cross-\\| (fixnum #!optional fixnum plotter-config-arg -> real-shape-plotter))
(: shape-cross-/ (fixnum #!optional fixnum plotter-config-arg -> real-shape-plotter))
(: shape-cross-x (fixnum #!optional fixnum plotter-config-arg -> real-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 (real-shape-cross-- wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'real-shape-cross-- wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (let ((x0 (fx- xm xm0)) (y0 (fx- ym ym0)))
            (when c1 (canvas-draw-line cv x0 ym (fx+ x0 mx) ym c1)) )
          (list 'cross-- 'real wd ht cfg) ) ) ) )

(define (|real-shape-cross-\|| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args '|real-shape-cross-\|| wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (let ((x0 (fx- xm xm0)) (y0 (fx- ym ym0)))
            (when c2 (canvas-draw-line cv xm (fx+ y0 my) xm y0 c2)) )
          (list '|cross-\|| 'real wd ht cfg) ) ) ) )

(define (real-shape-cross-+ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'real-shape-cross-+ wd ht cfg 2)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (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)) ) )
          (list 'cross-+ 'real wd ht cfg) ) ) )

(define (|real-shape-cross-\\| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args '|real-shape-cross-\\| wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (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))) )
          (list '|cross-\\| 'real wd ht cfg) ) ) )

(define (real-shape-cross-/ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'real-shape-cross-/ wd ht cfg 1)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (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)) )
          (list 'cross-/ 'real wd ht cfg) ) ) ) )

(define (real-shape-cross-x wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (c1 c2 mx my xm0 ym0 cfg) (cross-shape-args 'real-shape-cross-+ wd ht cfg 2)
    (lambda (#!optional cv (xm xm0) (ym ym0))
      (if cv
          (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)) )
          (list 'cross-x 'real wd ht cfg) ) ) ) )

;;

(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 (shape-cross-- wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'shape-cross-- wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (real-shape-cross-- pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list 'cross-- 'virtual wd ht cfg) ) ) ) ) )

(define (|shape-cross-\|| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args '|shape-cross-\|| wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (|real-shape-cross-\|| pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list '|cross-\|| 'virtual wd ht cfg) ) ) ) ) )

(define (shape-cross-+ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'shape-cross-+ wd ht cfg 2)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (real-shape-cross-+ pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list 'cross-+ 'virtual wd ht cfg) ) ) ) ) )

(define (|shape-cross-\\| wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args '|shape-cross-\\| wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (|real-shape-cross-\\| pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list '|cross-\\| 'virtual wd ht cfg) ) ) ) ) )

(define (shape-cross-/ wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'shape-cross-/ wd ht cfg 1)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (real-shape-cross-/ pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list 'cross-/ 'virtual wd ht cfg) ) ) ) ) )

(define (shape-cross-x wd #!optional (ht wd) (cfg (current-plotter-char)))
  (receive (xm0 ym0 cfg) (virtual-cross-shape-args 'shape-cross-x wd ht cfg 2)
    ;wait until have a canvas
    (let ((plotter (the (or false real-shape-plotter) #f)))
      (lambda (#!optional cv (xm xm0) (ym ym0))
        (if cv
            (begin
              (unless plotter
                (receive (pwd pht) (%canvas-real cv wd ht)
                  (set! plotter (real-shape-cross-x pwd pht cfg)) ) )
              (receive (pxm0 pym0) (%canvas-real cv xm0 ym0)
                (plotter cv pxm0 pym0)) )
            (list 'cross-x 'virtual wd ht cfg) ) ) ) ) )

;;

(define (cross-shape-size info)
  (let ((w (the integer (caddr info))) (h (the integer (cadddr info))))
    (values w h) ) )

(define CROSS-IDS '(cross-- |cross-\|| cross-+ |cross-\\| cross-/ cross-x))

(for-each (cut register-shape-method <> 'size cross-shape-size) CROSS-IDS)


) ;module (s9fes char-canvas shape cross)