From e8c98a65cd161a5d2c0a76d41e39b352e083a9ab Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Sat, 17 Aug 2019 07:43:03 +0100
Subject: refactor box management -- towards trapezium

---
 draw.c     | 88 ++++++++++++++++++++++++++++++++++++++++++++++----------------
 gramscii.h | 14 ++++++++--
 2 files changed, 77 insertions(+), 25 deletions(-)

diff --git a/draw.c b/draw.c
index 1c74a94..e1ee63b 100644
--- a/draw.c
+++ b/draw.c
@@ -161,7 +161,7 @@ void draw_parallelogram(int x1, int y1, char st, char fix){
 	}
 	else
 		f = draw_xy;
-	if (st & BOX_PARR){
+	if (st == BOX_PARR){
 		minoff = dy;
 		maxoff = 0;
 		lean = '/';
@@ -195,47 +195,89 @@ void draw_parallelogram(int x1, int y1, char st, char fix){
 
 }
 
-char flip_lean(char st){
-	if (st & BOX_PARR)
+char flip_par_lean(char st){
+	if (st == BOX_PARR)
 		return BOX_PARL;
-	else if (st & BOX_PARL)
+	else if (st == BOX_PARL)
 		return BOX_PARR;
 	return st;
 }
 
+void draw_trapezium(int x1, int y1, char st, char fix){
+
+}
+
+/* 
+ * draw the current box, being it an actual box, a parallelogram, or a 
+ *  trapezium
+ */
+void update_box(int x1, int y1, char st, char fix){
+
+	if (st == BOX_RECT)
+		draw_box(x1, y1, fix);
+	else if (st & BOX_PAR)
+		draw_parallelogram(x1, y1, st, fix);
+	else if (st & BOX_TRAP)
+		draw_trapezium(x1, y1, st, fix);
+	status_bar();
+	show_cursor();
+}
+
+char toggle_trap_type(char st){
+	return st;
+}
+
+int box_end(char c, char st){
+	if (c == '\n' || 
+	    c == 27   ||
+	    ((st == BOX_RECT) &&  c == 'b') ||
+	    ((st & BOX_PAR)   &&  c == 'z') ||
+	    ((st & BOX_TRAP)  &&  c == 't'))
+		return 1;
+	return 0; 
+}
+
+/* draw boxes, parallelograms, and trapezia */
 void get_box(FILE *fc, char st){
 	char c;
 	int orig_x=x, orig_y=y;
 	redraw();
 	step = 1;
+#ifdef DEBUG
+	fprintf(stderr, "box style: %d\n", st);
+#endif
 	draw_box(x,y,NOFIX);
-	while((c=fgetc(fc))!=EOF && c != 27 && c!= 'b' && c != '\n'){
-		if (c == 'Z'){
-			st = flip_lean(st);
+	while((c=fgetc(fc))!=EOF && !box_end(c, st)){
+		if (c == 'Z' && (st & BOX_PAR)){
+			st = flip_par_lean(st);
 			redraw();
-			goto update_box;
+#ifdef DEBUG
+	fprintf(stderr, "new parallelogram style: %d\n", st);
+#endif
+			update_box(orig_x, orig_y, st, NOFIX);
+			continue;
+		}
+		else if (c == 'T' && (st & BOX_TRAP)){
+			st = toggle_trap_type(st);
+			redraw();
+			update_box(orig_x, orig_y, st, NOFIX);
+			continue;
+		}
+		if (change_style(c)){
+			update_box(orig_x, orig_y, st, NOFIX);
+			continue;
 		}
-		if (change_style(c))
-			goto update_box;
 		if (!move_around(c, fc, 1)) 
 			continue;
 		check_bound(&x, &y);
 		redraw();
 		step = 1;
-update_box:
-		if (st == BOX_RECT)
-			draw_box(orig_x, orig_y, NOFIX);
-		else
-			draw_parallelogram(orig_x, orig_y, st, NOFIX);
-		status_bar();
-		show_cursor();
-	}
-	if (st == BOX_RECT && (c == 'b' || c == '\n')){
-		draw_box(orig_x, orig_y, FIX);
-		modified = 1;
+		update_box(orig_x, orig_y, st, NOFIX);
 	}
-	else if ((st & (BOX_PARR | BOX_PARL)) &&  (c == 'z' || c == '\n')){
-		draw_parallelogram(orig_x, orig_y, st, FIX);
+	if (((st == BOX_RECT ) && (c == 'b' || c == '\n')) ||
+	   ( (st &  BOX_PAR  ) && (c == 'z' || c == '\n')) ||
+	   ( (st &  BOX_TRAP ) && (c == 't' || c == '\n'))){
+		update_box(orig_x, orig_y, st, FIX);
 		modified = 1;
 	}
 	redraw();
diff --git a/gramscii.h b/gramscii.h
index c2b9170..b8c2161 100644
--- a/gramscii.h
+++ b/gramscii.h
@@ -36,10 +36,20 @@
 /** box style **/
 /* rectangular box */
 #define BOX_RECT 0x00
+/* parallelograms */
+#define BOX_PAR  0x04
 /* parallelogram (leaning right) */
-#define BOX_PARR 0x01
+#define BOX_PARR 0x05
 /* parallelogram (leaning left) */
-#define BOX_PARL 0x02
+#define BOX_PARL 0x06
+/* trapezium */
+#define BOX_TRAP    0x10
+#define BOX_TRAP_UR 0x11
+#define BOX_TRAP_UC 0x12
+#define BOX_TRAP_UL 0x13
+#define BOX_TRAP_DL 0x14
+#define BOX_TRAP_DC 0x15
+#define BOX_TRAP_DR 0x16
 /**/
 
 #define NOFIX 0x0
-- 
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