From 1942f603803a92b0c2f078975a04167a6ee2f7bf Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Thu, 18 Feb 2021 19:18:32 +0100
Subject: i&m: add operators

---
 Year_2/IandM/bitplane/bitplane.pde  |  39 ++++++++++++++++++++++++++++++++++++
 Year_2/IandM/bitplane/data/lena.png | Bin 0 -> 473831 bytes
 2 files changed, 39 insertions(+)
 create mode 100644 Year_2/IandM/bitplane/bitplane.pde
 create mode 100644 Year_2/IandM/bitplane/data/lena.png

(limited to 'Year_2/IandM/bitplane')

diff --git a/Year_2/IandM/bitplane/bitplane.pde b/Year_2/IandM/bitplane/bitplane.pde
new file mode 100644
index 0000000..33cda9c
--- /dev/null
+++ b/Year_2/IandM/bitplane/bitplane.pde
@@ -0,0 +1,39 @@
+int nb = 0;
+
+void setup() {
+  size(512, 256);
+}
+
+void draw() {
+  PImage img = loadImage("lena.png");
+  img.resize(256, 256);
+  img.filter(GRAY);
+
+  image(img, 0, 0);
+  image(bitplane(img, nb), 256, 0);
+}
+
+void keyPressed() {
+  if(key == '+' && nb < 7) {
+    nb++;
+  } else if(key == '-' && nb > 1) {
+    nb--;
+  }
+}
+
+PImage bitplane(PImage I, int nb) {
+  PImage out = I.copy();
+  out.loadPixels();
+
+  int x, r;
+
+  for (int i = 0; i < out.pixels.length; ++i) {
+    x = int(red(out.pixels[i]));
+    r = (x >> nb) & 1;
+    out.pixels[i] = color(255*r);
+  }
+
+  out.updatePixels();
+
+  return out;
+}
diff --git a/Year_2/IandM/bitplane/data/lena.png b/Year_2/IandM/bitplane/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/bitplane/data/lena.png differ
-- 
cgit v1.2.3-18-g5258