From ff98c7de21688f612696c80406290310bbb91dce Mon Sep 17 00:00:00 2001
From: Florian Richter <mail@f1ori.de>
Date: Fri, 12 Aug 2011 15:07:56 +0200
Subject: [PATCH] nick_matrix: show/hide nickname in center

---
 firmware/l0dable/nick_matrix.c | 66 +++++++++++++++++++++++++++++-----
 1 file changed, 57 insertions(+), 9 deletions(-)

diff --git a/firmware/l0dable/nick_matrix.c b/firmware/l0dable/nick_matrix.c
index a6398c9..8e70318 100644
--- a/firmware/l0dable/nick_matrix.c
+++ b/firmware/l0dable/nick_matrix.c
@@ -1,13 +1,13 @@
 #include <sysinit.h>
 
 #include "basic/basic.h"
+#include "basic/config.h"
 #include "lcd/render.h"
 
 #include "usetable.h"
 
-#define SCREEN_WIDTH 12
+#define SCREEN_WIDTH 13
 #define SCREEN_HEIGHT 8
-#define INVALID_POS 127
 
 #define FONT_WIDTH 7
 #define FONT_HEIGHT 8
@@ -16,47 +16,95 @@
 
 #define MAX_LINE_LENGTH 6
 
+#define TICKS_SHOW_NICKNAME 100
+#define TICKS_HIDE_NICKNAME 50
+#define NICKNAME_ACTION_SHOW 1
+#define NICKNAME_ACTION_HIDE 2
+
 void ram(void){
 	lcdClear();
 
+	// nickname helper variables
+	int nickname_len = strlen(GLOBAL(nickname));
+	int nickname_posx = (SCREEN_WIDTH - nickname_len) / 2;
+	int nickname_posy = SCREEN_HEIGHT / 2;
+
+	// state variables for show/hide effect
+	int ticks_until_next_nickname_action = TICKS_SHOW_NICKNAME;
+	int nickname_action = NICKNAME_ACTION_SHOW;
+
 	struct matrix_line {
 		int head_x, head_y;
 		int cur_length;
 		int length;
 	} matrix_lines[MATRIX_LINES_LENGTH];
 
+	// initialize matrix_lines
 	for (int i = 0; i < MATRIX_LINES_LENGTH; i++) {
 		matrix_lines[i].cur_length = -1;
 	}
 
+	// main loop
 	while (1) {
+		// for every matrix line
 		for(int i = 0; i<MATRIX_LINES_LENGTH; i++) {
 			struct matrix_line *ml = matrix_lines + i;
-			// new tail
+			// create new tail (old tail vanished)
 			if (ml->cur_length == -1) {
 				ml->head_x = getRandom() % SCREEN_WIDTH;
 				ml->head_y = getRandom() % SCREEN_HEIGHT - 1;
 				ml->length = getRandom() % MAX_LINE_LENGTH + 3;
 				ml->cur_length = 0;
 			}
-			// new char
+			// set new char
 			if (ml->head_y < SCREEN_HEIGHT-1) {
 				ml->head_y++;
-				int chr = getRandom() % 95 + 33;
+				char chr;
+				int chrpos = ml->head_x - nickname_posx;
+				if (nickname_action == NICKNAME_ACTION_SHOW
+						&& ml->head_y == nickname_posy
+						&& chrpos >= 0 && chrpos < nickname_len) {
+					// show the nickname
+					chr = GLOBAL(nickname)[chrpos];
+				} else {
+					chr = getRandom() % 95 + 33;
+				}
 				DoChar(ml->head_x * FONT_WIDTH, ml->head_y * FONT_HEIGHT, chr);
 				ml->cur_length++;
 			}
-			// remove chars (when length or bottom is reached)
+			// remove char (when length or bottom is reached)
 			if (ml->cur_length > ml->length || ml->head_y >= SCREEN_HEIGHT-1) {
-				DoChar(ml->head_x * FONT_WIDTH, (ml->head_y - ml->cur_length) * FONT_HEIGHT, ' ');
+				int chrpos = ml->head_x - nickname_posx;
+				if ( ! (nickname_action == NICKNAME_ACTION_SHOW
+						&& (ml->head_y - ml->cur_length) == nickname_posy
+						&& chrpos >= 0 && chrpos < nickname_len
+						)) {
+					// only delete, if it's not the nickname
+					DoChar(ml->head_x * FONT_WIDTH, (ml->head_y - ml->cur_length) * FONT_HEIGHT, ' ');
+				}
 				ml->cur_length--;
 			}
 		}
 		lcdDisplay();
-		// Exit on enter+left
+		// show and hide nickname
+		ticks_until_next_nickname_action--;
+		if (ticks_until_next_nickname_action <= 0) {
+			switch (nickname_action) {
+			case NICKNAME_ACTION_SHOW:
+				nickname_action = NICKNAME_ACTION_HIDE;
+				ticks_until_next_nickname_action = TICKS_HIDE_NICKNAME;
+				break;
+			case NICKNAME_ACTION_HIDE:
+				nickname_action = NICKNAME_ACTION_SHOW;
+				ticks_until_next_nickname_action = TICKS_SHOW_NICKNAME;
+				break;
+			}
+		}
+		// Exit on any key
 		int key = getInputRaw();
 		if(key!= BTN_NONE)
 			return;
-        delayms_queue_plus(90,0);
+		// sleep and process queue (e. g. meshnetwork)
+		delayms_queue_plus(90,0);
 	};
 };