add PVector.setHeading() for parity with p5.js (fixes #193)

Author: benfry

core/src/processing/core/PVector.java

@@ -345,7 +345,7 @@ static public PVector fromAngle(float angle, PVector target) {
 
   /**
    *
-   * Copies the components of the vector and returns the result as a <b>PVector</b>. 
+   * Copies the components of the vector and returns the result as a <b>PVector</b>.
    *
    *
    * @webref pvector:method
@@ -868,6 +868,14 @@ public float heading2D() {
   }
 
 
+  public PVector setHeading(float angle) {
+    float m = mag();
+    x = m * Math.cos(a);
+    y = m * Math.sin(a);
+    return this;
+  }
+
+
   /**
    *
    * Rotate the vector by an angle (only 2D vectors), magnitude remains the same

todo.txt

@@ -18,6 +18,8 @@ X   https://github.com/processing/processing4/pull/199
 X don't sort user's charset array when calling createFont()
 X   https://github.com/processing/processing4/issues/197
 X   https://github.com/processing/processing4/pull/198
+X add PVector.setHeading() for parity with p5.js
+X   https://github.com/processing/processing4/issues/193
 
 
 earlier