From 34a0ec991e4985d3ca4719ffc696f681370e14fc Mon Sep 17 00:00:00 2001
From: KatolaZ <katolaz@freaknet.org>
Date: Fri, 19 Jul 2019 12:04:44 +0100
Subject: initial arrow implementation

---
 gramscii.c | 139 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 132 insertions(+), 7 deletions(-)

diff --git a/gramscii.c b/gramscii.c
index bf988be..2cc7213 100644
--- a/gramscii.c
+++ b/gramscii.c
@@ -17,6 +17,7 @@
 #define TEXT   0x04
 
 
+#define DIR_N  0x00
 #define DIR_R  0x01
 #define DIR_U  0x02
 #define DIR_D  0x04
@@ -50,12 +51,12 @@ int y;
 int step;
 char cursor;
 char corner;
-char hlines[]  = {"-~=#@._"};
-char vlines[]  = {"|H#@:;i"};
+char hlines[]  = {"-~=#@._ "};
+char vlines[]  = {"|H#@:;i "};
 char corners[] = {"+'H#@.\""};
-int hlines_sz= sizeof(hlines);
-int vlines_sz= sizeof(vlines);
-int corners_sz = sizeof(corners);
+int hlines_sz= sizeof(hlines) -1;
+int vlines_sz= sizeof(vlines) -1;
+int corners_sz = sizeof(corners) -1;
 int cur_hl, cur_vl, cur_corn;
 char line_h;
 char line_v;
@@ -137,7 +138,6 @@ void redraw(){
 	}
 	status_bar();
 	show_cursor();
-	step = 1;
 }
 
 void update_current(){
@@ -235,8 +235,8 @@ void draw_box(int x1, int y1, int fix){
 void get_box(){
 	char c;
 	int orig_x=x, orig_y=y;
-	
 	redraw();
+	step = 1;
 	draw_box(x,y,NOFIX);
 	while((c=getchar())!=EOF && c != 27 && c!= 'b'){
 		switch(c){
@@ -259,6 +259,7 @@ void get_box(){
 		}
 		check_bound();
 		redraw();
+		step = 1;
 		draw_box(orig_x, orig_y, NOFIX);
 		status_bar();
 		show_cursor();
@@ -270,6 +271,126 @@ void get_box(){
 }
 
 
+int progr_x(int dir){
+	switch(dir){
+		case DIR_L:
+			return -1;
+		case DIR_R:
+			return +1;
+		default:
+			return 0;
+	}
+	return 0;
+}
+
+
+int progr_y(int dir){
+	switch(dir){
+		case DIR_D:
+			return +1;
+		case DIR_U:
+			return -1;
+		default:
+			return 0;
+	}
+	return 0;
+}
+
+
+/* FIXME: fix pointer position */
+/* FIXME: set initial and final markers */
+/* FIXME: draw "corner" as first char after change of dir */
+void draw_arrow(int x, int y, char *a, int a_len, int fix){
+
+	int i, j;
+	char line;
+	void (*f)(int, int, char);
+
+		
+	if (fix == FIX)
+		f = set_xy;
+	else
+		f = draw_xy;
+
+	if (!a_len){
+		f(x,y,corner);
+		return;
+	}
+	line = (a[0] & DIR_L) || (a[0] & DIR_R) ? line_h : line_v;
+	f(x,y,line);
+	for (i=0; i<a_len; i+=2){
+		for(j=0; j<a[i+1]; j++){
+			line = (a[i] & DIR_L) || (a[i] & DIR_R) ? line_h : line_v;
+			x += progr_x(a[i]);
+			y += progr_y(a[i]);
+			f(x, y, line); 
+		}
+	}
+	show_cursor();
+}
+
+void get_arrow(){
+
+	char c;
+	int orig_x=x, orig_y=y, arrow_len;
+	static char *arrow = NULL;
+	static int arrow_sz;
+
+	if (!arrow){
+		arrow_sz = 100;
+		arrow = malloc(arrow_sz * sizeof(char));
+	}
+	arrow_len = 0;
+	dir = DIR_N;
+	
+	redraw();
+	step = 1;
+	//draw_arrow(x,y,NOFIX);
+	while((c=getchar())!=EOF && c != 27 && c!= 'a'){
+		switch(c){
+			case 'H': step = 5;
+			case 'h': 
+				dir = DIR_L;
+				x -= step;
+				break;	
+			case 'J': step = 5;
+			case 'j':
+				dir = DIR_D;
+				y += step;
+				break;
+			case 'K': step = 5;
+			case 'k':
+				dir = DIR_U;
+				y -= step;
+				break;
+			case 'L': step = 5;
+			case 'l':
+				dir = DIR_R;
+				x += step;
+				break;
+			default:
+				continue;
+		}
+		check_bound();
+		/* FIXME: if we are out of bound, do nothing? */
+		if (arrow_len == arrow_sz){
+			arrow_sz *=2;
+			arrow = realloc(arrow, arrow_sz * sizeof(char));
+		}
+		arrow[arrow_len++] = dir;
+		arrow[arrow_len++] = step;
+		redraw();
+		step = 1;
+		draw_arrow(orig_x, orig_y, arrow, arrow_len, NOFIX);
+		status_bar();
+		show_cursor();
+	}
+	if (c == 'a')
+		draw_arrow(orig_x, orig_y, arrow, arrow_len, FIX);
+	redraw();
+	state = MOVE;
+}
+
 void write_file(){
 	char fname[256];
 	FILE *f;
@@ -333,6 +454,10 @@ void commands(){
 				state = BOX;
 				get_box();
 				break;
+			case 'a':
+				state = ARROW;
+				get_arrow();
+				break;
 			case 'w':
 				write_file();
 				break;
-- 
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