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art/jitter-scarlettekk/jitter.js

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+/*
+@title: Jitter (The Downward Spiral)
+@author: scarlettekk
+@snapshot: jitter.png
+*/
+
+
+/* VARIABLES */
+const spiralTightness = 0.00025;
+const spiralSize = 1;
+const jitterIterationDampener = 0.0001;
+const jitterLengthDampener = 0.0005;
+const jitterMaxAngle = 360;
+
+setDocDimensions(125, 125); // center is 63, 63
+const t = new bt.Turtle();
+const tt = new bt.Turtle(); //used for tracking the pure spiral
+
+t.jump([63,63]);
+tt.jump([63,63]);
+tt.up();
+t.down();
+
+for (var i = 0; i <= 4000; i++) {
+  tt.forward(i * spiralTightness); // track the 
+  tt.right(spiralSize);            // pure spiral
+  for (var z = 0; z < bt.randIntInRange(0, 50) * i * jitterIterationDampener; z++) {
+  t.right(bt.randInRange(0, jitterMaxAngle));       // introduce the jitter to the
+  t.forward(bt.rand() * i * jitterLengthDampener);  // drawing turtle
+  }
+  t.goTo(tt.pos); // reset jitter for the next step
+}
+
+drawLines(t.lines());
+drawLines(bt.text("the downward spiral", [3,10], 0.5));
+drawLines(bt.text("coraline shuryn", [3,5], 0.5));