graphics-api docs

docs/chapters/arclength/draw-slices.js

@@ -33,7 +33,7 @@ drawSlices(w, h, a, n) {
     let area = 0;
     let step = w/n;
     for(let i=0, f=TAU/w, c, y; i<w; i += step) {
-        c = `rgba(150,150,255,${0.4 + 0.3 * random()}`;
+        c = `rgba(150,150,255,${random(0.4, 0.7)}`;
         if (n > 50) setStroke(c);
         setFill(c);
         y = sin((i+step/2) * f) * a;

docs/chapters/circles/arc-approximation.js

@@ -25,7 +25,7 @@ draw() {
   noStroke();
   setFill(`rgba(100,255,100,0.4)`);
   let a = this.angle;
-  arc(w/2, h/2, r, a < 0 ? a : 0, a < 0 ? 0 : a, w/2, h/2);
+  wedge(w/2, h/2, r, a < 0 ? a : 0, a < 0 ? 0 : a);
 
   curve.drawSkeleton();
   curve.drawCurve();

docs/chapters/circles_cubic/arc-approximation.js

@@ -26,7 +26,7 @@ draw() {
   noStroke();
   setFill(`rgba(100,255,100,0.4)`);
   let a = this.angle;
-  arc(w/2, h/2, r, a < 0 ? a : 0, a < 0 ? 0 : a, w/2, h/2);
+  wedge(w/2, h/2, r, a < 0 ? a : 0, a < 0 ? 0 : a);
 
   guess.drawSkeleton(`lightblue`);
   guess.drawCurve(`lightblue`);

docs/chapters/curvature/curvature.js

@@ -53,7 +53,7 @@ computeCurvature(curve, t) {
         dd = curve.dderivative(t),
         num = d.x * dd.y - d.y * dd.x,
         qdsum = d.x * d.x + d.y * d.y,
-        dnm = pow(qdsum, 3 / 2);
+        dnm = qdsum ** 3/2;
 
   if (num === 0 || dnm === 0) return 0;
 

docs/chapters/reordering/reorder.js

@@ -5,8 +5,8 @@ setup() {
           h = this.height;
     for (let i=0; i<10; i++) {
       points.push({
-        x: w/2 + random() * 20 + cos(PI*2 * i/10) * (w/2 - 40),
-        y: h/2 + random() * 20 + sin(PI*2 * i/10) * (h/2 - 40)
+        x: w/2 + random(20) + cos(PI*2 * i/10) * (w/2 - 40),
+        y: h/2 + random(20) + sin(PI*2 * i/10) * (h/2 - 40)
       });
     }
     setMovable(points);