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# PathInterpolator

public class PathInterpolator
extends Object implements Interpolator

 java.lang.Object ↳ androidx.core.animation.PathInterpolator

An interpolator that can traverse a Path that extends from Point (0, 0) to (1, 1). The x coordinate along the Path is the input value and the output is the y coordinate of the line at that point. This means that the Path must conform to a function y = f(x).

The Path must not have gaps in the x direction and must not loop back on itself such that there can be two points sharing the same x coordinate. It is alright to have a disjoint line in the vertical direction:

Path path = new Path();
path.lineTo(0.25f, 0.25f);
path.moveTo(0.25f, 0.5f);
path.lineTo(1f, 1f);

## Summary

### Public constructors

PathInterpolator(Path path)

Create an interpolator for an arbitrary Path.

PathInterpolator(float controlX, float controlY)

Create an interpolator for a quadratic Bezier curve.

PathInterpolator(float controlX1, float controlY1, float controlX2, float controlY2)

Create an interpolator for a cubic Bezier curve.

PathInterpolator(Context context, AttributeSet attrs, XmlPullParser parser)

Create an interpolator from XML.

PathInterpolator(Resources res, Resources.Theme theme, AttributeSet attrs, XmlPullParser parser)

Create an interpolator from XML.

### Public methods

float getInterpolation(float t)

Using the line in the Path in this interpolator that can be described as y = f(x), finds the y coordinate of the line given t as the x coordinate.

## Public constructors

### PathInterpolator

public PathInterpolator (Path path)

Create an interpolator for an arbitrary Path. The Path must begin at (0, 0) and end at (1, 1).

Parameters
path Path: The Path to use to make the line representing the interpolator.

### PathInterpolator

public PathInterpolator (float controlX,
float controlY)

Create an interpolator for a quadratic Bezier curve. The end points (0, 0) and (1, 1) are assumed.

Parameters
controlX float: The x coordinate of the quadratic Bezier control point.

controlY float: The y coordinate of the quadratic Bezier control point.

### PathInterpolator

public PathInterpolator (float controlX1,
float controlY1,
float controlX2,
float controlY2)

Create an interpolator for a cubic Bezier curve. The end points (0, 0) and (1, 1) are assumed.

Parameters
controlX1 float: The x coordinate of the first control point of the cubic Bezier.

controlY1 float: The y coordinate of the first control point of the cubic Bezier.

controlX2 float: The x coordinate of the second control point of the cubic Bezier.

controlY2 float: The y coordinate of the second control point of the cubic Bezier.

### PathInterpolator

public PathInterpolator (Context context,
AttributeSet attrs,
XmlPullParser parser)

Create an interpolator from XML.

Parameters
context Context: The context.

attrs AttributeSet: The AttributeSet for pathInterpolator.

parser XmlPullParser: The XmlPullParser that was used to create the AttributeSet with Xml.asAttributeSet(XmlPullParser).

### PathInterpolator

public PathInterpolator (Resources res,
Resources.Theme theme,
AttributeSet attrs,
XmlPullParser parser)

Create an interpolator from XML.

Parameters
res Resources: The resources.

theme Resources.Theme: The theme.

attrs AttributeSet: The AttributeSet for pathInterpolator.

parser XmlPullParser: The XmlPullParser that was used to create the AttributeSet with Xml.asAttributeSet(XmlPullParser).

## Public methods

### getInterpolation

public float getInterpolation (float t)

Using the line in the Path in this interpolator that can be described as y = f(x), finds the y coordinate of the line given t as the x coordinate. Values less than 0 will always return 0 and values greater than 1 will always return 1.

Parameters
t float: Treated as the x coordinate along the line.

Value is between 0.0 and 1.0 inclusive.

Returns
float The y coordinate of the Path along the line where x = t.