jitter-scarlettekk

art/jitter-scarlettekk/index.js

@@ -0,0 +1,60 @@
+/*
+@title: Jitter (The Downward Spiral)
+@author: scarlettekk
+@snapshot: jitter.png
+*/
+/* VARIABLES */
+var spiralTightness = bt.randInRange(0.5, 1);
+var spiralSize = bt.randInRange(0.5, 1);
+var jitterIterationDampener = bt.randInRange(0.1, 1);
+var jitterLengthDampener = bt.randInRange(0.3, 1);
+var jitterMaxAngle = bt.randInRange(180, 360); /* allow normalization of variables to 1 */
+spiralTightness *= 0.00025;
+jitterIterationDampener *= 0.0001;
+jitterLengthDampener *= 0.0005;
+setDocDimensions(125, 125); // center is 63, 63
+const bounds = [
+    [
+        [0, 0],
+        [0, 125],
+        [125, 125],
+        [125, 0],
+        [0, 0]
+    ]
+];
+const t = new bt.Turtle();
+const tt = new bt.Turtle(); //used for introducing wobble
+const ttt = new bt.Turtle(); //used for tracking the pure spiral
+t.jump([66, 63]);
+tt.jump([66, 63]);
+ttt.jump([66, 63]);
+ttt.up();
+tt.up();
+t.down();
+for (var i = 0; i <= 4000; i++) {
+    if (i < 400) {
+        if (i % 2 == 0) {
+            spiralStep(i);
+        }
+    } else {
+        spiralStep(i);
+    }
+}
+
+function spiralStep(i) {
+    ttt.forward(i * spiralTightness); // track the 
+    ttt.right(spiralSize); // pure spiral
+    tt.right(bt.randInRange(0, 30));
+    tt.forward(i * 0.002); // make the loops smaller towards the center
+    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
+    tt.goTo(ttt.pos);
+}
+var text = bt.text("the downward spiral\n\ncoraline shuryn", [3, 10], 0.5);
+const textBounds = bt.offset(text, 1);
+text = bt.text("the downward spiral\n\ncoraline shuryn", [3, 10], 0.5); //reassign because offset is mutating :(
+drawLines(bt.cover(bt.cut(t.lines(), bounds), textBounds));
+drawLines(text);