week 4 recursion

w4_1_recursion/Turtle/sketch.js

@@ -0,0 +1,109 @@
+let t;
+const len = 1000;
+
+function setup() {
+  // createCanvas(400, 300);
+  createCanvas(window.innerWidth, window.innerHeight);
+  noLoop(); // will draw only once
+  t = new Turtle(); // getting ready to draw
+  // green
+  stroke(0, 200, 0);
+  strokeWeight(5);
+}
+
+function draw() {
+  background(240);
+
+  // getting ready
+  t.setxy(-len / 2, 0);
+  t.right(90);
+
+  // draw Koch line
+  koch(5, len);
+}
+
+function koch(order, length) {
+  // PLACEHOLDER
+  t.forward(200);
+}
+
+// Don't write underneath this line
+
+class Turtle {
+  constructor() {
+    this.oldx = int(width / 2);
+    this.oldy = int(height / 2);
+    this.x = this.oldx;
+    this.y = this.oldy;
+    this.tcolor = 0;
+    this.angle = 0;
+    stroke(this.tcolor);
+  }
+
+  forward(step) {
+    this.x = this.oldx - step * cos(radians(this.angle + 90));
+    this.y = this.oldy - step * sin(radians(this.angle + 90));
+    line(this.oldx, this.oldy, this.x, this.y);
+    this.oldx = this.x;
+    this.oldy = this.y;
+  }
+
+  back(step) {
+    this.x = this.oldx + step * cos(radians(this.angle + 90));
+    this.y = this.oldy + step * sin(radians(this.angle + 90));
+    line(this.oldx, this.oldy, this.x, this.y);
+    this.oldx = this.x;
+    this.oldy = this.y;
+  }
+
+  home() {
+    this.oldx = int(width / 2);
+    this.oldy = int(height / 2);
+    line(this.oldx, this.oldy, this.x, this.y);
+    this.oldx = this.x;
+    this.oldy = this.y;
+    this.angle = 0.0;
+  }
+
+  setx(step) {
+    this.x = this.oldx + step;
+    this.oldx = this.x;
+  }
+
+  sety(step) {
+    this.y = this.oldy + step;
+    this.oldy = this.y;
+  }
+
+  setxy(stepx, stepy) {
+    this.x = this.oldx + stepx;
+    this.y = this.oldy + stepy;
+    this.oldx = this.x;
+    this.oldy = this.y;
+  }
+
+  left(dangle) {
+    this.angle -= dangle;
+  }
+
+  right(dangle) {
+    this.angle += dangle;
+  }
+
+  setheading(nangle) {
+    this.angle = nangle;
+  }
+
+  pencolor(ncolor) {
+    this.tcolor = ncolor;
+    stroke(this.tcolor);
+  }
+
+  penup() {
+    noStroke();
+  }
+
+  pendown() {
+    stroke(this.tcolor);
+  }
+}