From 47a17a404c2faabc3db70df3a7a64a462a1a9d21 Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Sat, 28 Sep 2019 21:48:38 +0100
Subject: up and down (centred) trapezium working

---
 draw.c     | 37 ++++++++++++++++++++++++++++++++-----
 gramscii.h |  6 +++---
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/draw.c b/draw.c
index 3e973b9..822113f 100644
--- a/draw.c
+++ b/draw.c
@@ -209,7 +209,7 @@ void draw_trapezium(int x1, int y1, char st, char fix){
 	int xincr;
 	int i;
 	void (*f)(int, int, char);
-
+	char left_c, right_c;
 
 	xmin = MIN(x, x1);
 	xmax = MAX(x, x1);
@@ -226,11 +226,27 @@ void draw_trapezium(int x1, int y1, char st, char fix){
 		f = draw_xy;
 
 	/* This is valid only for "upper" trapezoids */
-	if (st & BOX_TRAP_U){
+	if ((st & BOX_TRAP_U) == BOX_TRAP_U){
+#ifdef DEBUG
+		fprintf(stderr, "This is an 'upward' trapezium\n");
+#endif
 		ylong = ymax;
 		yshort = ymin;
 		xoff = dy;
 		xincr = -1;
+		left_c = '/';
+		right_c = '\\';
+	}
+	else if ((st & BOX_TRAP_D) == BOX_TRAP_D){
+#ifdef DEBUG
+		fprintf(stderr, "This is a 'downward' trapezium\n");
+#endif
+		ylong = ymin;
+		yshort = ymax;
+		xoff = dy;
+		xincr = +1;
+		right_c = '/';
+		left_c = '\\';
 	}
 	for(i=xmin+1; i<=xmax; i++){
 		f(i, ylong, line_h);
@@ -243,9 +259,11 @@ void draw_trapezium(int x1, int y1, char st, char fix){
 	f(xmax-xoff, yshort, corner);
 	f(xmax, ylong, corner);
 	xoff --;
+	if ((st & BOX_TRAP_D) == BOX_TRAP_D)
+		xoff = 1;
 	for(i=ymin+1; i<ymax; i++, xoff += xincr){
-		f(xmin + xoff, i, '/');
-		f(xmax - xoff, i, '\\');
+		f(xmin + xoff, i, left_c);
+		f(xmax - xoff, i, right_c);
 	}	
 
 	
@@ -272,6 +290,12 @@ void update_box(int x1, int y1, char st, char fix){
 }
 
 char toggle_trap_type(char st){
+	if (st & BOX_TRAP){
+		if (st < BOX_TRAP_DR)
+			st ++;
+		else 
+			st = BOX_TRAP_UR;
+	}
 	return st;
 }
 
@@ -300,13 +324,16 @@ void get_box(FILE *fc, char st){
 			st = flip_par_lean(st);
 			redraw();
 #ifdef DEBUG
-	fprintf(stderr, "new parallelogram style: %d\n", st);
+			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);
+#ifdef DEBUG
+			fprintf(stderr, "new trapezium style: %d\n", st);
+#endif
 			redraw();
 			update_box(orig_x, orig_y, st, NOFIX);
 			continue;
diff --git a/gramscii.h b/gramscii.h
index f82185d..9c8959a 100644
--- a/gramscii.h
+++ b/gramscii.h
@@ -50,9 +50,9 @@
 #define BOX_TRAP_UR 0x25
 #define BOX_TRAP_UC 0x26
 #define BOX_TRAP_UL 0x27
-#define BOX_TRAP_DL 0x28
-#define BOX_TRAP_DC 0x29
-#define BOX_TRAP_DR 0x2a
+#define BOX_TRAP_DL 0x29
+#define BOX_TRAP_DC 0x2a
+#define BOX_TRAP_DR 0x2b
 /**/
 
 #define NOFIX 0x0
-- 
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