From da9d0adc57ea4289ae1e2abddb690cb0583f8758 Mon Sep 17 00:00:00 2001
From: Stefan Kinzel <stefan@kinzel.net>
Date: Thu, 14 Aug 2014 22:35:03 +0200
Subject: [PATCH] first version of the DNA-Animation

---
 src/animations/Makefile  |   5 ++
 src/animations/config.in |   2 +
 src/animations/dna.c     | 145 +++++++++++++++++++++++++++++++++++++++
 src/animations/dna.h     |  14 ++++
 src/display_loop.c       |   7 ++
 5 files changed, 173 insertions(+)
 create mode 100644 src/animations/dna.c
 create mode 100644 src/animations/dna.h

diff --git a/src/animations/Makefile b/src/animations/Makefile
index 585edb9..8595a08 100644
--- a/src/animations/Makefile
+++ b/src/animations/Makefile
@@ -58,6 +58,11 @@ ifeq ($(ANIMATION_TIME),y)
   SRC += borg_time.c
 endif
 
+ifeq ($(ANIMATION_DNA),y)
+SRC += dna.c
+endif
+
+
 include $(MAKETOPDIR)/rules.mk
 
 include $(MAKETOPDIR)/depend.mk
diff --git a/src/animations/config.in b/src/animations/config.in
index 7f9d88c..f41c9f3 100644
--- a/src/animations/config.in
+++ b/src/animations/config.in
@@ -63,6 +63,8 @@ comment "Animations"
 	endmenu
 
 	bool     "Black Hole"       ANIMATION_BLACKHOLE
+	
+	bool     "DNA"       ANIMATION_DNA	$RANDOM_SUPPORT
 
 	dep_bool "Squares"          ANIMATION_SQUARES       $RANDOM_SUPPORT
 
diff --git a/src/animations/dna.c b/src/animations/dna.c
new file mode 100644
index 0000000..22ab6b9
--- /dev/null
+++ b/src/animations/dna.c
@@ -0,0 +1,145 @@
+#include "../config.h"
+#include <stdint.h>
+#include "../random/prng.h"
+#include "../pixel.h"
+#include "../util.h"
+
+
+#define HEIGHT 12
+#define LINE_DISTANCE 4
+#define SIN_LENGTH 16
+
+// uint8_t sin[SIN_LENGTH] = {0, 1, 2, 2, 3, 3, 4, 4, 4, 3, 3, 3, 2, 2, 1, 0};
+
+uint8_t sintab[SIN_LENGTH] = {
+		1,
+		2,
+		3,
+		4,
+		5,
+		5,
+		6,
+		6,
+		6,
+		6,
+		6,
+		5,
+		5,
+		4,
+		3,
+		2,
+		};
+
+/*
+uint8_t sintab[SIN_LENGTH] = {
+1,
+1,
+2,
+2,
+3,
+3,
+4,
+4,
+5,
+5,
+5,
+5,
+6,
+6,
+6,
+6,
+6,
+6,
+6,
+6,
+6,
+5,
+5,
+5,
+5,
+4,
+4,
+3,
+3,
+2,
+2,
+1,
+};
+*/
+
+void dna(){
+	uint8_t mid = NUM_COLS / 2;
+	uint8_t draw_line = 0;
+
+	uint8_t top = 0;
+	uint8_t bottom = 0;
+
+	uint8_t top_color = 3;
+	uint8_t bottom_color = 2;
+
+	uint32_t c = 10000;
+
+	uint8_t sinpos = 0;
+
+	uint8_t direction = 1;
+
+	while(c--){
+		top = mid - sintab[sinpos];
+		bottom = mid + sintab[sinpos];
+
+		setpixel((pixel){15,top}, top_color);
+		setpixel((pixel){15,bottom}, bottom_color);
+
+		if(draw_line == 0){
+			for(uint8_t linex = top+1; linex < bottom; linex++){
+				setpixel((pixel){15, linex}, 1);
+			}
+			setpixel((pixel){15, mid}, 1);
+		}
+
+		if(draw_line == 0){
+			if(top <= 1){
+				direction = 1;
+			}
+			if(bottom >= NUM_ROWS-1){
+				direction = -1;
+			}
+			mid = mid + (random8() > 240) * direction;
+		}
+
+		draw_line = (draw_line+1) % LINE_DISTANCE;
+		sinpos = (sinpos + 1) % SIN_LENGTH;
+
+		if(sinpos == 0){
+			uint8_t tmp_color = top_color;
+			top_color = bottom_color;
+			bottom_color = tmp_color;
+		}
+
+		move();
+
+		wait(40);
+	}
+
+
+}
+
+/**
+ * Shifts the Pixmap one px right
+ */
+void move(){
+		unsigned char plane, row, byte;
+
+		for(plane=0; plane<=NUMPLANE; plane++){
+			for(row=NUM_COLS;row>0; row--){
+				for(byte=0; byte < LINEBYTES; byte++){
+					pixmap[plane][row][byte] = pixmap[plane][row][byte] >> 1;
+					if(byte < LINEBYTES-1){
+						pixmap[plane][row][byte] =
+								pixmap[plane][row][byte] |
+								(pixmap[plane][row][byte+1] & 0b00000001) << 7;
+					}
+				}
+			}
+		}
+}
diff --git a/src/animations/dna.h b/src/animations/dna.h
new file mode 100644
index 0000000..d54faee
--- /dev/null
+++ b/src/animations/dna.h
@@ -0,0 +1,14 @@
+/*
+ * dna.h
+ *
+ *  Created on: 15.07.2014
+ *      Author: stefan
+ */
+
+#ifndef DNA_H_
+#define DNA_H_
+
+void dna();
+void move();
+
+#endif /* DNA_H_ */
diff --git a/src/display_loop.c b/src/display_loop.c
index 42929e2..0735dd2 100644
--- a/src/display_loop.c
+++ b/src/display_loop.c
@@ -7,6 +7,7 @@
 #include "animations/snake.h"
 #include "animations/program.h"
 #include "animations/matrix.h"
+#include "animations/dna.h"
 #include "animations/gameoflife.h"
 #include "animations/stonefly.h"
 #include "animations/flyingdots.h"
@@ -291,6 +292,12 @@ void display_loop(){
 		  break;
 #endif
 
+#ifdef ANIMATION_DNA
+		case 40:
+			dna();
+			break;
+#endif
+
 #ifdef MENU_SUPPORT
 		case 42:
 			mode = 1;