From c85889e2d2c15e8166435b376bf36367a28ca844 Mon Sep 17 00:00:00 2001
From: Nils Schneider <nils.schneider@gmail.com>
Date: Sun, 6 Nov 2011 19:31:22 +0100
Subject: schnecke mit fading

---
 Matrix_5x6/Charlie/Charlie.pde | 73 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 67 insertions(+), 6 deletions(-)

diff --git a/Matrix_5x6/Charlie/Charlie.pde b/Matrix_5x6/Charlie/Charlie.pde
index ee7f5dd..d863a03 100644
--- a/Matrix_5x6/Charlie/Charlie.pde
+++ b/Matrix_5x6/Charlie/Charlie.pde
@@ -57,12 +57,14 @@ int aus = 10;
 
 void setup(){ /*nothing*/ }
  
-void zufall_fading() {
+/* zufällige LEDs werden langsam dunkler */
+
+void zufall_fading_down() {
   clrscr();
   int x, y;
   for (x=0; x<6; x++)
     for (y=0; y<5; y++)
-      scr[x][y] = random(30) + 2;
+      scr[x][y] = random(30);
 
   int i=30;
 
@@ -73,12 +75,14 @@ void zufall_fading() {
 
 }
 
-void zufall_fading2() {
+/* zufällige LEDs werden langsam heller */
+
+void zufall_fading_up() {
   clrscr();
   int x, y;
   for (x=0; x<6; x++)
     for (y=0; y<5; y++)
-      scr[x][y] = - random(30) - 2;
+      scr[x][y] = - random(30);
 
   int i=50;
 
@@ -86,10 +90,67 @@ void zufall_fading2() {
   drawscr(2); 
   fadescr_up();
   }  
+}
 
- 
+/* schnecke mit vier startpunkten (0 bis 3) von außen nach innnen
+   mit fading */
+
+void schnecke(int s) {
+  clrscr();
+  int x, y, d, w = 0;
+  d = s;
+  switch(s) {
+     case 0:
+       x = 0;
+       y = 0;
+       break;
+     case 1:
+       x = 5;
+       y = 0;
+       break;
+     case 2:
+       x = 5;
+       y = 4;
+       break;
+     case 3:
+       x = 0;
+       y = 4;
+       break;
+  }
+  
+  while (1) {
+    if (scr[x][y]) break;
+    
+    scr[x][y] = 20;
+    drawscr(2);
+    fadescr_down();
+    
+    switch (d) {
+      case 0: if (x == 5 - w) {d = 1; if (s == 2) w++;} break;
+      case 1: if (y == 4 - w) {d = 2; if (s == 3) w++;} break;
+      case 2: if (x == w) {d = 3; if (s == 0) w++;} break;
+      case 3: if (y == w) {d = 0; if (s == 1) w++;} break;
+    }
+    
+    switch (d) {
+      case 0: x++; break;
+      case 1: y++; break;
+      case 2: x--; break;
+      case 3: y--; break;
+    }
+  }
+  int i = 20;
+  while(i--) {
+    fadescr_down();
+    drawscr(2);
+  }
 }
 
 void loop() {
-  zufall_fading2();
+//  zufall_fading_up();
+//  zufall_fading_down();
+  schnecke(0);
+  schnecke(1);
+  schnecke(2);
+  schnecke(3);
 }
-- 
cgit v1.2.3