public
class
PathInterpolator
extends BaseInterpolator
| java.lang.Object | ||
| ↳ | android.view.animation.BaseInterpolator | |
| ↳ | android.view.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:
Developers
Path path = new Path();
path.lineTo(0.25f, 0.25f);
path.moveTo(0.25f, 0.5f);
path.lineTo(1f, 1f);
Public constructors | |
|---|---|
PathInterpolator(Path path)
Create an interpolator for an arbitrary |
|
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)
|
|
Public methods | |
|---|---|
float
|
getInterpolation(float t)
Using the line in the Path in this interpolator that can be described as
|
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
From
interface
android.animation.TimeInterpolator
| |
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 (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 (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 (Context context, AttributeSet attrs)
| Parameters | |
|---|---|
context |
Context
|
attrs |
AttributeSet
|
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. |
| Returns | |
|---|---|
float |
The y coordinate of the Path along the line where x = t. |
See also: