;;; envelope editor based on xm module (cf enved.scm)
;;;
;;; (xe-create-enved name parent args axis-bounds) -> new envelope editor (returned value is list)
;;; (xe-envelope editor) -> current envelope (settable)

(provide 'snd-xm-enved.scm)

(if (and (provided? 'snd-motif)
	 (not (provided? 'snd-snd-motif.scm)))
    (load "snd-motif.scm"))

(define xe-envelope
  (dilambda
   (lambda (drawer)
     (or (car drawer) 
	 (let ((ax-inf (drawer 3)))
	   (list (ax-inf 0)
		 (ax-inf 1)
		 (ax-inf 2)
		 (ax-inf 3))))) ; was 1?
   (lambda (drawer new-env)
     (set! (drawer 0) new-env)
     (xe-redraw drawer))))

(define (xe-create-enved name parent args axis-bounds)

  (define (xe-ungrfy drawer y)
    (let* ((bounds (drawer 3))
	   (locs (drawer 2))
	   (ay0 (bounds 1))
	   (ay1 (bounds 3))
	   (py0 (locs 1))
	   (py1 (locs 3)))
      (if (= py0 py1)
	  ay1
	  (min ay1
	       (max ay0
		    (+ ay0 (* (- ay1 ay0)
			      (/ (- py0 y)
				 (- py0 py1)))))))))
  
  (define (xe-ungrfx drawer x)
    (let* ((bounds (drawer 3))
	   (locs (drawer 2))
	   (ax0 (bounds 0))
	   (ax1 (bounds 2))
	   (px0 (locs 0))
	   (px1 (locs 2)))
      (if (= px0 px1)
	  ax0
	  (min ax1
	       (max ax0
		    (+ ax0 (* (- ax1 ax0)
			      (/ (- x px0)
				 (- px1 px0)))))))))

  (define xe-mouse-down 0)
  (define xe-mouse-pos 0)
  (define xe-mouse-new #f)

  (define (xe-mouse-press drawer xx yy)

    (define (xe-envelope-position x cur-env)
      (let search-point ((e cur-env)
			 (pos 0))
	(if (= (car e) x)
	    pos
	    (search-point (cddr e) (+ pos 2)))))

    (define (xe-on-dot? x y cur-env pos)
      (let ((xe-mouse-radius .03))
	(and (pair? cur-env)
	     (pair? (cdr cur-env))
	     (or (and (< (abs (- (car cur-env) x)) xe-mouse-radius)
		      (< (abs (- (cadr cur-env) y)) xe-mouse-radius)
		      pos)
		 (xe-on-dot? x y (cddr cur-env) (+ pos 2))))))
    
    (define (xe-add-envelope-point x y cur-env)
      (let ((new-env ()))
	(let search-point ((e cur-env))
	  (cond ((null? e) (append new-env (list x y)))
		((= (car e) x) (append new-env (list x y) (cddr e)))
		((> (car e) x) (append new-env (list x y) e))
		(else
		 (set! new-env (append new-env (list (car e) (cadr e))))
		 (search-point (cddr e)))))))
    
    (let* ((cur-env (xe-envelope drawer))
	   (x (xe-ungrfx drawer xx))
	   (y (xe-ungrfy drawer yy))
	   (pos (xe-on-dot? x y cur-env 0)))
      (set! xe-mouse-new (not pos))
      (set! xe-mouse-down (get-internal-real-time))
      (if pos
	  (set! xe-mouse-pos pos)
	  (begin
	    (set! (xe-envelope drawer) (xe-add-envelope-point x y cur-env))
	    (set! xe-mouse-pos (xe-envelope-position x (xe-envelope drawer)))))))


  (define (xe-mouse-drag drawer xx yy)

    (define (xe-edit-envelope-point pos x y cur-env)
      (let ((new-env ()))
	(let search-point ((e cur-env)
			   (npos 0))
	  (if (= npos pos)
	      (append new-env (list x y) (cddr e))
	      (begin
		(set! new-env (append new-env (list (car e) (cadr e))))
		(search-point (cddr e) (+ npos 2)))))))
    
    ;; point exists, needs to be edited with check for various bounds
    (let* ((cur-env (xe-envelope drawer))
	   (x (xe-ungrfx drawer xx))
	   (y (xe-ungrfy drawer yy))
	   (lx (if (= xe-mouse-pos 0)
		   (car cur-env)
		   (if (>= xe-mouse-pos (- (length cur-env) 2))
		       (cur-env (- (length cur-env) 2))
		       (max (cur-env (- xe-mouse-pos 2))
			    (min x (cur-env (+ xe-mouse-pos 2))))))))
      (set! (xe-envelope drawer) 
	    (xe-edit-envelope-point xe-mouse-pos lx y cur-env))
      (xe-redraw drawer)))


  (define xe-mouse-release 
    (let ((xe-click-time .1)
	  (xe-mouse-up 0))

      (define (xe-remove-envelope-point pos cur-env)
	(let ((new-env ()))
	  (let search-point ((e cur-env)
			     (npos 0))
	    (if (null? e)
		new-env
		(if (= pos npos)
		    (append new-env (cddr e))
		    (begin
		      (set! new-env (append new-env (list (car e) (cadr e))))
		      (search-point (cddr e) (+ npos 2))))))))
      
      (lambda (drawer)
	  (let ((cur-env (xe-envelope drawer)))
	    (set! xe-mouse-up (get-internal-real-time))
	    (if (and (not xe-mouse-new)
		     (<= (- xe-mouse-up xe-mouse-down) xe-click-time)
		     (not (= xe-mouse-pos 0))
		     (< xe-mouse-pos (- (length cur-env) 2)))
		(set! (xe-envelope drawer)
		      (xe-remove-envelope-point xe-mouse-pos cur-env))))
	  (xe-redraw drawer)
	  (set! xe-mouse-new #f))))

  (if (provided? 'snd-motif)
      (with-let (sublet *motif* 
		  'args args 'parent parent 'axis-bounds axis-bounds 'name name
		  'xe-redraw xe-redraw 'xe-mouse-press xe-mouse-press 'xe-mouse-drag xe-mouse-drag 'xe-mouse-release xe-mouse-release)
	(if (not (member XmNbackground args))
	    (set! args (append args (list XmNbackground *graph-color*))))
	(if (not (member XmNforeground args))
	    (set! args (append args (list XmNforeground *data-color*))))
	(let* ((drawer (XtCreateManagedWidget name xmDrawingAreaWidgetClass parent args))
	       (gc (car (snd-gcs)))
	       (arrow-cursor (XCreateFontCursor (XtDisplay (cadr (main-widgets))) XC_crosshair))
	       (editor (let ((x0 (car axis-bounds))
			     (x1 (cadr axis-bounds)) ; too confusing! -- change internally below
			     (y0 (caddr axis-bounds))
			     (y1 (cadddr axis-bounds)))
			 (list (list x0 y0 x1 y0) ; needs to be in user-coordinates (graph size can change)
			       drawer 
			       #f  ; axis pixel locs filled in when drawn
			       (list x0 y0 x1 y1)
			       (list gc #f)
			       name))))
	  (XtAddCallback drawer XmNresizeCallback 
			 (lambda (w context info) 
			   (set! (editor 2) (apply draw-axes drawer gc name axis-bounds))
			   (xe-redraw editor)))
	  (XtAddCallback drawer XmNexposeCallback 
			 (lambda (w context info) 
			   (set! (editor 2) (apply draw-axes drawer gc name axis-bounds))
			   (xe-redraw editor)))
	  (XtAddEventHandler drawer ButtonPressMask #f 
			     (lambda (w context ev flag) 
			       (xe-mouse-press editor (.x ev) (.y ev))))
	  (XtAddEventHandler drawer ButtonMotionMask #f 
			     (lambda (w context ev flag)
			       (xe-mouse-drag editor (.x ev) (.y ev))))
	  (XtAddEventHandler drawer ButtonReleaseMask #f 
			     (lambda (w context ev flag)
			       (xe-mouse-release editor)))
	  (XtAddEventHandler drawer EnterWindowMask #f
			     (lambda (w context ev flag)
			       (XDefineCursor (XtDisplay w) (XtWindow w) arrow-cursor)))
	  (XtAddEventHandler drawer LeaveWindowMask #f
			     (lambda (w context ev flag)
			       (XUndefineCursor (XtDisplay w) (XtWindow w))))
	  editor))

      (with-let (sublet *gtk* 
		  'args args 'parent parent 'axis-bounds axis-bounds 'name name
		  'xe-redraw xe-redraw 'xe-mouse-press xe-mouse-press 'xe-mouse-drag xe-mouse-drag 'xe-mouse-release xe-mouse-release)
	(let* ((drawer (gtk_drawing_area_new))
	       (gc (car (snd-gcs)))
	       (x0 (car axis-bounds))
	       (x1 (cadr axis-bounds))
	       (y0 (caddr axis-bounds))
	       (y1 (cadddr axis-bounds))
	       (arrow-cursor (gdk_cursor_new_for_display (gdk_display_get_default) GDK_CROSSHAIR))
	       (old-cursor (gdk_cursor_new_for_display (gdk_display_get_default) GDK_LEFT_PTR))
	       (editor (list (list x0 y0 x1 y0) ; needs to be in user-coordinates (graph size can change)
			     drawer 
			     #f  ; axis pixel locs filled in when drawn
			     (list x0 y0 x1 y1)
			     (list gc #f)
			     name))
	       (dragging #f))
	  
	  ;; (xe-create-enved "hi" ((sound-widgets 0) 9) () '(0.0 1.0 0.0 1.0)) -- this doesn't work?
	  
	  (define (local-draw-axes wid gc label x0 x1 y0 y1)
	    (let* ((cr (make-cairo wid))
		   (val (draw-axes wid gc label x0 x1 y0 y1 x-axis-in-seconds show-all-axes cr)))
	      (free-cairo cr)
	      val))
	  
	  (gtk_widget_set_events drawer GDK_ALL_EVENTS_MASK)
	  (gtk_box_pack_start (GTK_BOX parent) drawer #t #t 10)
	  (gtk_widget_show drawer)
	  (gtk_widget_set_size_request drawer -1 200)
	  
	  (let ((gf (g_cclosure_new (lambda (w e d)
				      (set! (editor 2) (apply local-draw-axes drawer gc name axis-bounds))
				      (xe-redraw editor)
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "draw" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  (let ((gf (g_cclosure_new (lambda (w e d)
				      (set! (editor 2) (apply local-draw-axes drawer gc name axis-bounds))
				      (xe-redraw editor)
				      #f)
				    #f #f)))

	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "configure_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  (let ((gf (g_cclosure_new (lambda (w e d) 
				      (let ((coords (cdr (gdk_event_get_coords (GDK_EVENT e)))))
					(set! dragging #t)
					(xe-mouse-press editor (car coords) (cadr coords)))
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "button_press_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  (let ((gf (g_cclosure_new (lambda (w e d) 
				      (set! dragging #f)
				      (xe-mouse-release editor)
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "button_release_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  (let ((gf (g_cclosure_new (lambda (w e d) 
				      (if dragging
					  (let ((coords (cdr (gdk_event_get_coords (GDK_EVENT e)))))
					    (xe-mouse-drag editor (car coords) (cadr coords))))
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "motion_notify_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  
	  (let ((gf (g_cclosure_new (lambda (w e d)
				      (gdk_window_set_cursor (gtk_widget_get_window w) arrow-cursor)
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "enter_notify_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  (let ((gf (g_cclosure_new (lambda (w e d)
				      (gdk_window_set_cursor (gtk_widget_get_window w) old-cursor)
				      #f)
				    #f #f)))
	    (g_signal_connect_closure_by_id (GPOINTER drawer)
					    (g_signal_lookup "leave_notify_event" (G_OBJECT_TYPE (G_OBJECT drawer)))
					    0 gf #f))
	  editor))))

(define (xe-redraw drawer)
  (let* ((cur-env (xe-envelope drawer))
	 (widget (drawer 1))
	 (dpy (and (provided? 'snd-motif) ((*motif* 'XtDisplay) widget)))
	 (wn ((if (provided? 'snd-motif) (*motif* 'XtWindow) (*gtk* 'gtk_widget_get_window)) widget))
	 (ax-pix (drawer 2))
	 (ax-inf (drawer 3))
	 (gc (car (drawer 4)))
	 (name (drawer 5))
	 (len (and (list? cur-env) (length cur-env)))
	 (get_realized (if (provided? 'snd-gtk) (*gtk* 'gtk_widget_get_realized))))
    (when (and (list? ax-pix)
	       (list? cur-env)
	       ((if (provided? 'snd-motif) (*motif* 'XtIsManaged) get_realized) widget))
      (let ((py0 (ax-pix 1))
	    (py1 (ax-pix 3))
	    (ix0 (ax-inf 0))
	    (ix1 (ax-inf 2))
	    (iy0 (ax-inf 1))
	    (iy1 (ax-inf 3))
	    (mouse-d 10)
	    (mouse-r 5))
	
	(define xe-grfx
	  (let ((px0 (ax-pix 0))
		(px1 (ax-pix 2)))
	    (lambda (x)
	      (if (= px0 px1)
		  px0
		  (min px1
		       (max px0
			    (floor (+ px0 (* (- px1 px0)
					     (/ (- x ix0)
						(- ix1 ix0)))))))))))
	
	(define (xe-grfy y)
	  (if (= py0 py1)
	      py0
	      (min py0 ; grows downward so y1 < y0
		   (max py1
			(floor (+ py1 (* (- py0 py1)
					 (/ (- y iy1)
					    (- iy0 iy1)))))))))
	
	(when (> py0 py1)
	  (if (provided? 'snd-motif)
	      (begin
		((*motif* 'XClearWindow) dpy wn)
		(draw-axes widget gc name ix0 ix1 iy0 iy1)
		(do ((lx #f)
		     (ly #f)
		     (i 0 (+ i 2)))
		    ((= i len))
		  (let ((cx (xe-grfx (cur-env i)))
			(cy (xe-grfy (cur-env (+ i 1)))))
		    ((*motif* 'XFillArc) dpy wn gc (- cx mouse-r) (- cy mouse-r) mouse-d mouse-d 0 23040) ; (* 360 64))
		    (if lx
			((*motif* 'XDrawLine) dpy wn gc lx ly cx cy))
		    (set! lx cx)
		    (set! ly cy))))
	      ;; *gtk* 
	      (let ((cr ((*gtk* 'gdk_cairo_create) ((*gtk* 'GDK_WINDOW) wn))))
		
		(let ((size (widget-size ((*gtk* 'GTK_WIDGET) widget))))
		  ((*gtk* 'cairo_push_group) cr)
		  ((*gtk* 'cairo_set_source_rgb) cr 1.0 1.0 1.0)
		  ((*gtk* 'cairo_rectangle) cr 0 0 (car size) (cadr size))
		  ((*gtk* 'cairo_fill) cr))
		
		(draw-axes widget gc name ix0 ix1 iy0 iy1 x-axis-in-seconds show-all-axes cr)
		
		((*gtk* 'cairo_set_line_width) cr 1.0)
		((*gtk* 'cairo_set_source_rgb) cr 0.0 0.0 0.0)
		(do ((lx #f)
		     (ly #f)
		     (i 0 (+ i 2)))
		    ((= i len))
		  (let ((cx (xe-grfx (cur-env i)))
			(cy (xe-grfy (cur-env (+ i 1)))))
		    ((*gtk* 'cairo_arc) cr cx cy mouse-r 0.0 (* 2 pi))
		    ((*gtk* 'cairo_fill) cr)
		    (if lx
			(begin
			  ((*gtk* 'cairo_move_to) cr lx ly)
			  ((*gtk* 'cairo_line_to) cr cx cy)
			  ((*gtk* 'cairo_stroke) cr)))
		    (set! lx cx)
		    (set! ly cy)))
		((*gtk* 'cairo_pop_group_to_source) cr)
		((*gtk* 'cairo_paint) cr)
		((*gtk* 'cairo_destroy) cr))))))))

