# ArcMotion

`open class ArcMotion : PathMotion`
 kotlin.Any ↳ androidx.transition.PathMotion ↳ androidx.transition.ArcMotion

A PathMotion that generates a curved path along an arc on an imaginary circle containing the two points. If the horizontal distance between the points is less than the vertical distance, then the circle's center point will be horizontally aligned with the end point. If the vertical distance is less than the horizontal distance then the circle's center point will be vertically aligned with the end point.

When the two points are near horizontal or vertical, the curve of the motion will be small as the center of the circle will be far from both points. To force curvature of the path, `setMinimumHorizontalAngle(float)` and `setMinimumVerticalAngle(float)` may be used to set the minimum angle of the arc between two points.

This may be used in XML as an element inside a transition.

``````<code>&lt;changeBounds&gt;
&lt;arcMotion android:minimumHorizontalAngle="15"
android:minimumVerticalAngle="0"
android:maximumAngle="90"/&gt;
&lt;/changeBounds&gt;</code>``````

## Summary

### Public constructors

`<init>()`

`<init>(context: Context!, attrs: AttributeSet!)`

### Public methods

open Float
`getMaximumAngle()`

Returns the maximum arc along the circle between two points.

open Float
`getMinimumHorizontalAngle()`

Returns the minimum arc along the circle between two points aligned near horizontally.

open Float
`getMinimumVerticalAngle()`

Returns the minimum arc along the circle between two points aligned near vertically.

open Path!
`getPath(startX: Float, startY: Float, endX: Float, endY: Float)`

open Unit
`setMaximumAngle(angleInDegrees: Float)`

Sets the maximum arc along the circle between two points.

open Unit
`setMinimumHorizontalAngle(angleInDegrees: Float)`

Sets the minimum arc along the circle between two points aligned near horizontally.

open Unit
`setMinimumVerticalAngle(angleInDegrees: Float)`

Sets the minimum arc along the circle between two points aligned near vertically.

## Public constructors

### <init>

`ArcMotion()`

### <init>

`ArcMotion(context: Context!, attrs: AttributeSet!)`

## Public methods

### getMaximumAngle

`open fun getMaximumAngle(): Float`

Returns the maximum arc along the circle between two points. When start and end points have close to equal x and y differences, the curve between them is large. This forces the curved path to have an arc of at most the given angle.

The default value is 70 degrees.

Return
Float: The maximum angle of the arc on a circle describing the Path between the start and end points.

### getMinimumHorizontalAngle

`open fun getMinimumHorizontalAngle(): Float`

Returns the minimum arc along the circle between two points aligned near horizontally. When start and end points are close to horizontal, the calculated center point of the circle will be far from both points, giving a near straight path between the points. By setting a minimum angle, this forces the center point to be closer and give an exaggerated curve to the path.

The default value is 0.

Return
Float: The minimum arc along the circle between two points aligned near horizontally.

### getMinimumVerticalAngle

`open fun getMinimumVerticalAngle(): Float`

Returns the minimum arc along the circle between two points aligned near vertically. When start and end points are close to vertical, the calculated center point of the circle will be far from both points, giving a near straight path between the points. By setting a minimum angle, this forces the center point to be closer and give an exaggerated curve to the path.

The default value is 0.

Return
Float: The minimum angle of the arc on a circle describing the Path between two nearly vertically-separated points.

### getPath

`open fun getPath(startX: Float, startY: Float, endX: Float, endY: Float): Path!`

### setMaximumAngle

`open fun setMaximumAngle(angleInDegrees: Float): Unit`

Sets the maximum arc along the circle between two points. When start and end points have close to equal x and y differences, the curve between them is large. This forces the curved path to have an arc of at most the given angle.

The default value is 70 degrees.

Parameters
`angleInDegrees` Float: The maximum angle of the arc on a circle describing the Path between the start and end points.

### setMinimumHorizontalAngle

`open fun setMinimumHorizontalAngle(angleInDegrees: Float): Unit`

Sets the minimum arc along the circle between two points aligned near horizontally. When start and end points are close to horizontal, the calculated center point of the circle will be far from both points, giving a near straight path between the points. By setting a minimum angle, this forces the center point to be closer and give an exaggerated curve to the path.

The default value is 0.

Parameters
`angleInDegrees` Float: The minimum angle of the arc on a circle describing the Path between two nearly horizontally-separated points.

### setMinimumVerticalAngle

`open fun setMinimumVerticalAngle(angleInDegrees: Float): Unit`

Sets the minimum arc along the circle between two points aligned near vertically. When start and end points are close to vertical, the calculated center point of the circle will be far from both points, giving a near straight path between the points. By setting a minimum angle, this forces the center point to be closer and give an exaggerated curve to the path.

The default value is 0.

Parameters
`angleInDegrees` Float: The minimum angle of the arc on a circle describing the Path between two nearly vertically-separated points.