/*
 
 Erica Sadun, http://ericasadun.com
 
 */

#import <Foundation/Foundation.h>
#import "BezierElement.h"

#define NUMBER_OF_BEZIER_SAMPLES    6

typedef CGFloat (^InterpolationBlock)(CGFloat percent);

// Return Bezier Value
float CubicBezier(float t, float start, float c1, float c2, float end);
float QuadBezier(float t, float start, float c1, float end);

// Return Bezier Point
CGPoint CubicBezierPoint(CGFloat t, CGPoint start, CGPoint c1, CGPoint c2, CGPoint end);
CGPoint QuadBezierPoint(CGFloat t, CGPoint start, CGPoint c1, CGPoint end);

// Calculate Curve Length
float CubicBezierLength(CGPoint start, CGPoint c1, CGPoint c2, CGPoint end);
float QuadBezierLength(CGPoint start, CGPoint c1, CGPoint end);

// Element Distance
CGFloat ElementDistanceFromPoint(BezierElement *element, CGPoint point, CGPoint startPoint);

// Linear Interpolation
CGPoint InterpolateLineSegment(CGPoint p1, CGPoint p2, CGFloat percent, CGPoint *slope);

// Interpolate along element
CGPoint InterpolatePointFromElement(BezierElement *element, CGPoint point, CGPoint startPoint, CGFloat percent, CGPoint *slope);

// Ease
CGFloat EaseIn(CGFloat currentTime, int factor);
CGFloat EaseOut(CGFloat currentTime, int factor);
CGFloat EaseInOut(CGFloat currentTime, int factor);