Reference for Processing version 1.2. 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() 