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fixing problem where PVector.angleBetween() returns NaN

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Daniel Shiffman
2013-05-10 11:44:05 -04:00
parent 61357b4f91
commit d0f6159681
1 changed files with 6 additions and 0 deletions
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core/src/processing/core/PVector.java
+6
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@@ -979,6 +979,12 @@ public class PVector implements Serializable {
* @brief Calculate and return the angle between two vectors
*/
static public float angleBetween(PVector v1, PVector v2) {
// We get NaN if we pass in a zero vector which can cause problems
// Zero seems like a reasonable angle between a (0,0) vector and something else
if (v1.x == 0 && v1.y == 0) return 0.0f;
if (v2.x == 0 && v2.y == 0) return 0.0f;
double dot = v1.x * v2.x + v1.y * v2.y + v1.z * v2.z;
double v1mag = Math.sqrt(v1.x * v1.x + v1.y * v1.y + v1.z * v1.z);
double v2mag = Math.sqrt(v2.x * v2.x + v2.y * v2.y + v2.z * v2.z);