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

---
 draw.c | 58 ++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 42 insertions(+), 16 deletions(-)

(limited to 'draw.c')

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();
-- 
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