From a95019dfe0b64ed01051f2f059af7d7756d0dcdb Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Wed, 14 Aug 2019 07:59:53 +0100
Subject: add parallelogram mode

---
 TODO       |  5 +++--
 draw.c     | 58 ++++++++++++++++++++++++++++++++++++++++++----------------
 gramscii.c |  6 +++++-
 gramscii.h | 12 +++++++++++-
 screen.c   |  2 ++
 5 files changed, 63 insertions(+), 20 deletions(-)

diff --git a/TODO b/TODO
index 54225d6..48e2395 100644
--- a/TODO
+++ b/TODO
@@ -1,10 +1,10 @@
 + optimize redraws (redraw only the modified rectangle)
+- implement comment (#: ignore everything until the end of the line)
 - add screen geometry option (-g 25x80?)
-- maybe move "text" mode to "t"
+- (?)maybe move "text" mode to "t"
 - implement ellipse
 - (?) filled box (B)
 - (?) manage filled box character (as for other styles)
-- implement comment (#: ignore until the end of the line)
 + parse control characters 
   + parse arrows (text-mode will allow movements as well)
 - (?) implement CTRL+G as abort (aside ESC)
@@ -14,6 +14,7 @@
 - allow scrolling (both vertical and horizontal)
 - catch SIGWINCH and react appropriately (after scrolling is 
   enabled)
+* implement parallelogram mode (z/Z)
 * fix bug in reading commands from files
 * fix bug in visual crop
 * read file at point
diff --git a/draw.c b/draw.c
index 0cb50a1..c361acb 100644
--- a/draw.c
+++ b/draw.c
@@ -143,8 +143,9 @@ void draw_box(int x1, int y1, int fix){
 
 void draw_parallelogram(int x1, int y1, char st, char fix){
 	int xmin, ymin, xmax, ymax;
-	int dy;
+	int dy, minoff, maxoff, xoff, xincr;
 	int i;
+	char lean;
 	void (*f)(int, int, char);
 
 
@@ -160,27 +161,47 @@ void draw_parallelogram(int x1, int y1, char st, char fix){
 	}
 	else
 		f = draw_xy;
-	/*FIXME: INCOMPLETE -- CONTINUE HERE */
-	for(i=xmin+1; i<=xmax; i++){
-		f(i, ymin, line_h);
-		f(i, ymax, line_h);
+	if (st & BOX_PARR){
+		minoff = dy;
+		maxoff = 0;
+		lean = '/';
+		xincr = -1;
 	}
-	for(i=ymin+1; i<=ymax; i++){
-		f(xmin, i, line_v);
-		f(xmax, i, line_v);
+	else {
+		minoff = 0;
+		maxoff = dy;
+		lean = '\\';
+		xincr = +1;
 	}
-	f(xmin, ymin, corner);
-	f(xmin, ymax, corner);
-	f(xmax, ymin, corner);
-	f(xmax, ymax, corner);
+	for(i=xmin+1; i<=xmax-dy; i++){
+		f(i+minoff, ymin, line_h);
+		f(i+maxoff, ymax, line_h);
+	}
+	
+	for(i=ymin+1, xoff=minoff; i<=ymax; i++, xoff += xincr){
+		f(xmin+(xoff+xincr), i, lean);
+		if (minoff)
+			f(xmax - (minoff - xoff - xincr), i, lean);
+		else 
+			f(xmax - (maxoff - xoff - xincr), i, lean);
+	}
+	f(xmin+minoff, ymin, corner);
+	f(xmin+maxoff, ymax, corner);
+	f(xmax-maxoff, ymin, corner);
+	f(xmax-minoff, ymax, corner);
 	if (fix == FIX)
 		copy_lines_to_ring(ymin, ymax, NEW_STATE);
 	show_cursor();
 
-
-
 }
 
+char flip_lean(char st){
+	if (st & BOX_PARR)
+		return BOX_PARL;
+	else if (st & BOX_PARL)
+		return BOX_PARR;
+	return st;
+}
 
 void get_box(FILE *fc, char st){
 	char c;
@@ -189,6 +210,11 @@ void get_box(FILE *fc, char st){
 	step = 1;
 	draw_box(x,y,NOFIX);
 	while((c=fgetc(fc))!=EOF && c != 27 && c!= 'b' && c != '\n'){
+		if (c == 'Z'){
+			st = flip_lean(st);
+			redraw();
+			goto update_box;
+		}
 		if (change_style(c))
 			goto update_box;
 		if (!move_around(c, fc, 1)) 
@@ -208,8 +234,8 @@ update_box:
 		draw_box(orig_x, orig_y, FIX);
 		modified = 1;
 	}
-	else if ((st & (BOX_PAR1 | BOX_PAR2)) &&  (c == 'z' || c == 'Z' || c == '\n')){
-		draw_parallelogram(orig_x, orig_y, FIX);
+	else if ((st & (BOX_PARR | BOX_PARL)) &&  (c == 'z' || c == '\n')){
+		draw_parallelogram(orig_x, orig_y, st, FIX);
 		modified = 1;
 	}
 	redraw();
diff --git a/gramscii.c b/gramscii.c
index 2181d48..29b3f04 100644
--- a/gramscii.c
+++ b/gramscii.c
@@ -90,7 +90,7 @@ void commands(FILE *fc){
 					break;
 				case 'b':
 					mode = BOX;
-					get_box(fc);
+					get_box(fc, BOX_RECT);
 					break;
 				case 'A': autoend=1;
 				case 'a':
@@ -134,6 +134,10 @@ void commands(FILE *fc){
 				case 'r':
 					read_file_at(fc, x, y);
 					break;
+				case 'z':
+					mode = PAR;
+					get_box(fc, BOX_PARR);
+					break;
 				case 'q':
 					check_modified(fc);/** FALLTHROUGH **/
 				case 'Q':
diff --git a/gramscii.h b/gramscii.h
index 0bad4f2..6adea42 100644
--- a/gramscii.h
+++ b/gramscii.h
@@ -18,6 +18,7 @@
 #define TEXT   0x04
 #define DEL    0x08
 #define VIS    0x10
+#define PAR    0x20
 /**/
 
 /* directions */
@@ -31,6 +32,15 @@
 #define DIR_VER (DIR_D | DIR_U)
 /**/
 
+/** box style **/
+/* rectangular box */
+#define BOX_RECT 0x00
+/* parallelogram (leaning right) */
+#define BOX_PARR 0x01
+/* parallelogram (leaning left) */
+#define BOX_PARL 0x02
+/**/
+
 #define NOFIX 0x0
 #define FIX   0x1
 
@@ -169,7 +179,7 @@ int _isblank(int c);
 /** drawing-related functions **/
 int change_style(char c);
 void get_text(FILE *fc);
-void get_box(FILE *fc);
+void get_box(FILE *fc, char st);
 void get_arrow(FILE *fc);
 void erase(FILE *fc);
 void visual_box(FILE *fc);
diff --git a/screen.c b/screen.c
index d85ff81..21289c1 100644
--- a/screen.c
+++ b/screen.c
@@ -35,6 +35,8 @@ char* mode_str(){
 			return "del";
 		case VIS:
 			return "vis";
+		case PAR:
+			return "par";
 		default:
 			return "ERR";
 	}
-- 
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