Class Translation2d
- java.lang.Object
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- edu.wpi.first.math.geometry.Translation2d
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- All Implemented Interfaces:
Interpolatable<Translation2d>
public class Translation2d extends Object implements Interpolatable<Translation2d>
Represents a translation in 2d space. This object can be used to represent a point or a vector.This assumes that you are using conventional mathematical axes. When the robot is placed on the origin, facing toward the X direction, moving forward increases the X, whereas moving to the left increases the Y.
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Constructor Summary
Constructors Constructor Description Translation2d()
Constructs a Translation2d with X and Y components equal to zero.Translation2d(double x, double y)
Constructs a Translation2d with the X and Y components equal to the provided values.Translation2d(double distance, Rotation2d angle)
Constructs a Translation2d with the provided distance and angle.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Translation2d
div(double scalar)
Divides the translation by a scalar and returns the new translation.boolean
equals(Object obj)
Checks equality between this Translation2d and another object.double
getDistance(Translation2d other)
Calculates the distance between two translations in 2d space.double
getNorm()
Returns the norm, or distance from the origin to the translation.double
getX()
Returns the X component of the translation.double
getY()
Returns the Y component of the translation.int
hashCode()
Translation2d
interpolate(Translation2d endValue, double t)
Return the interpolated value.Translation2d
minus(Translation2d other)
Subtracts the other translation from the other translation and returns the difference.Translation2d
plus(Translation2d other)
Adds two translations in 2d space and returns the sum.Translation2d
rotateBy(Rotation2d other)
Applies a rotation to the translation in 2d space.Translation2d
times(double scalar)
Multiplies the translation by a scalar and returns the new translation.String
toString()
Translation2d
unaryMinus()
Returns the inverse of the current translation.
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Constructor Detail
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Translation2d
public Translation2d()
Constructs a Translation2d with X and Y components equal to zero.
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Translation2d
public Translation2d(double x, double y)
Constructs a Translation2d with the X and Y components equal to the provided values.- Parameters:
x
- The x component of the translation.y
- The y component of the translation.
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Translation2d
public Translation2d(double distance, Rotation2d angle)
Constructs a Translation2d with the provided distance and angle. This is essentially converting from polar coordinates to Cartesian coordinates.- Parameters:
distance
- The distance from the origin to the end of the translation.angle
- The angle between the x-axis and the translation vector.
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Method Detail
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getDistance
public double getDistance(Translation2d other)
Calculates the distance between two translations in 2d space.This function uses the pythagorean theorem to calculate the distance. distance = sqrt((x2 - x1)^2 + (y2 - y1)^2)
- Parameters:
other
- The translation to compute the distance to.- Returns:
- The distance between the two translations.
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getX
public double getX()
Returns the X component of the translation.- Returns:
- The x component of the translation.
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getY
public double getY()
Returns the Y component of the translation.- Returns:
- The y component of the translation.
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getNorm
public double getNorm()
Returns the norm, or distance from the origin to the translation.- Returns:
- The norm of the translation.
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rotateBy
public Translation2d rotateBy(Rotation2d other)
Applies a rotation to the translation in 2d space.This multiplies the translation vector by a counterclockwise rotation matrix of the given angle. [x_new] [other.cos, -other.sin][x] [y_new] = [other.sin, other.cos][y]
For example, rotating a Translation2d of {2, 0} by 90 degrees will return a Translation2d of {0, 2}.
- Parameters:
other
- The rotation to rotate the translation by.- Returns:
- The new rotated translation.
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plus
public Translation2d plus(Translation2d other)
Adds two translations in 2d space and returns the sum. This is similar to vector addition.For example, Translation2d{1.0, 2.5} + Translation2d{2.0, 5.5} = Translation2d{3.0, 8.0}
- Parameters:
other
- The translation to add.- Returns:
- The sum of the translations.
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minus
public Translation2d minus(Translation2d other)
Subtracts the other translation from the other translation and returns the difference.For example, Translation2d{5.0, 4.0} - Translation2d{1.0, 2.0} = Translation2d{4.0, 2.0}
- Parameters:
other
- The translation to subtract.- Returns:
- The difference between the two translations.
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unaryMinus
public Translation2d unaryMinus()
Returns the inverse of the current translation. This is equivalent to rotating by 180 degrees, flipping the point over both axes, or simply negating both components of the translation.- Returns:
- The inverse of the current translation.
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times
public Translation2d times(double scalar)
Multiplies the translation by a scalar and returns the new translation.For example, Translation2d{2.0, 2.5} * 2 = Translation2d{4.0, 5.0}
- Parameters:
scalar
- The scalar to multiply by.- Returns:
- The scaled translation.
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div
public Translation2d div(double scalar)
Divides the translation by a scalar and returns the new translation.For example, Translation2d{2.0, 2.5} / 2 = Translation2d{1.0, 1.25}
- Parameters:
scalar
- The scalar to multiply by.- Returns:
- The reference to the new mutated object.
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equals
public boolean equals(Object obj)
Checks equality between this Translation2d and another object.
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interpolate
public Translation2d interpolate(Translation2d endValue, double t)
Description copied from interface:Interpolatable
Return the interpolated value. This object is assumed to be the starting position, or lower bound.- Specified by:
interpolate
in interfaceInterpolatable<Translation2d>
- Parameters:
endValue
- The upper bound, or end.t
- How far between the lower and upper bound we are. This should be bounded in [0, 1].- Returns:
- The interpolated value.
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