Reference for Processing version 1.5. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.
| Name | curveTangent() | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Examples |  noFill();
curve(5, 26, 73, 24, 73, 61, 15, 65); 
int steps = 6;
for (int i = 0; i <= steps; i++) {
  float t = i / float(steps);
  float x = curvePoint(5, 73, 73, 15, t);
  float y = curvePoint(26, 24, 61, 65, t);
  //ellipse(x, y, 5, 5);
  float tx = curveTangent(5, 73, 73, 15, t);
  float ty = curveTangent(26, 24, 61, 65, t);
  float a = atan2(ty, tx);
  a -= PI/2.0;
  line(x, y, cos(a)*8 + x, sin(a)*8 + y);
} | ||||||||||
| Description | Calculates the tangent of a point on a curve. There is a good definition of "tangent" at Wikipedia: http://en.wikipedia.org/wiki/Tangent | ||||||||||
| Syntax | curveTangent(a, b, c, d, t) | ||||||||||
| Parameters | 
 | ||||||||||
| Usage | Web & Application | ||||||||||
| Related | curve() curveVertex() curvePoint() bezierTangent() | 

