February 12, 2015 18:30 · Feb 12, 2015
diff --git a/gistfile1.pde b/gistfile1.pde
@@ -0,0 +1,138 @@
+// by dave w
+
+int[][] result;
+float t, c;
+
+float ease(float p) {
+  return 3*p*p - 2*p*p*p;
+}
+
+float ease(float p, float g) {
+  if (p < 0.5) 
+    return 0.5 * pow(2*p, g);
+  else
+    return 1 - 0.5 * pow(2*(1 - p), g);
+}
+
+float mn = .5*sqrt(3);
+
+void setup() {
+  setup_();
+  result = new int[width*height][3];
+}
+
+void draw() {
+
+  if (!recording) {
+    t = mouseX*1.0/width;
+    c = mouseY*1.0/height;
+    if (mousePressed)
+      println(c);
+    draw_();
+  } else {
+    for (int i=0; i<width*height; i++)
+      for (int a=0; a<3; a++)
+        result[i][a] = 0;
+
+    c = 0;
+    for (int sa=0; sa<samplesPerFrame; sa++) {
+      t = map(frameCount-1 + sa*shutterAngle/samplesPerFrame, 0, numFrames, 0, 1);
+      draw_();
+      loadPixels();
+      for (int i=0; i<pixels.length; i++) {
+        result[i][0] += pixels[i] >> 16 & 0xff;
+        result[i][1] += pixels[i] >> 8 & 0xff;
+        result[i][2] += pixels[i] & 0xff;
+      }
+    }
+
+    loadPixels();
+    for (int i=0; i<pixels.length; i++)
+      pixels[i] = 0xff << 24 | 
+        int(result[i][0]*1.0/samplesPerFrame) << 16 | 
+        int(result[i][1]*1.0/samplesPerFrame) << 8 | 
+        int(result[i][2]*1.0/samplesPerFrame);
+    updatePixels();
+
+    saveFrame("f###.gif");
+    if (frameCount==numFrames)
+      exit();
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+int samplesPerFrame = 16;
+int numFrames = 72;        
+float shutterAngle = .65;
+
+boolean recording = false;
+
+void setup_() {
+  size(540, 500,P2D);
+  smooth(8);
+  rectMode(CENTER);
+  fill(32);
+  noStroke();
+}
+
+float xx(int i, int j) {
+  x = i*sp;
+  y = (j+1/3.0)*mn*sp;
+  if (j%2 == 0)
+    x += .5*sp;
+  r = dist(x, y, 0, 0);
+  th = atan2(y, x);
+  r *= pow(1.33, sin(TWO_PI*t-.000035*r*r)*exp(-.00001*r*r));
+  return r*cos(th);
+}
+
+float yy(int i, int j) {
+  x = i*sp;
+  y = (j+1/3.0)*mn*sp;
+  if (j%2 == 0)
+    x += .5*sp;
+  r = dist(x, y, 0, 0);
+  th = atan2(y, x);
+  r *= pow(1.4, sin(TWO_PI*t-.000035*r*r)*exp(-.00001*r*r));
+  return r*sin(th);
+}
+
+float ans;
+float x, y, tt;
+float sp = 44;
+int N = 8;
+float r, th;
+float x1, x2, y1, y2;
+float ll = .25;
+
+void lin(float x1, float y1, float x2, float y2){
+  line(lerp(x1,x2,ll), lerp(y1,y2,ll), lerp(x2,x1,ll), lerp(y2,y1,ll));
+}
+
+void draw_() {
+  background(28,25,24); 
+  pushMatrix();
+  translate(width/2, height/2);
+  for (int i=-N; i<=N; i++) {
+    for (int j=-N; j<=N; j++) {
+      fill(255);
+      noStroke();
+      ellipse(xx(i, j), yy(i, j), 6, 6);
+      stroke(255);
+      strokeWeight(1.25);
+      noFill();
+      x1 = xx(i,j); y1 = yy(i,j);
+      x2 = xx(i+1,j); y2 = yy(i+1,j);
+      lin(x1, y1, x2, y2);
+      x2 = xx(i,j+1); y2 = yy(i,j+1);
+      lin(x1, y1, x2, y2);
+      if (j%2 != 0){
+        x2 = xx(i-1, j+1); y2 = yy(i-1, j+1); }
+      else{
+        x2 = xx(i+1, j+1); y2 = yy(i+1, j+1); }
+      lin(x1, y1, x2, y2);
+    }
+  }
+  popMatrix();
+}