PointF Android

Introduction

PointF is a class in the Android graphics package that represents a point in a 2D coordinate system. It is commonly used in graphical applications to store and manipulate the location of a graphical element such as a shape, line, or text.

Usage

The PointF class contains two public float variables, x and y, which represent the x and y coordinates of the point.

public final float x;
public final float y;

You can create a new PointF object with the following constructors:

public PointF ();
public PointF (float x, float y);

Once you have created a PointF object, you can manipulate its x and y coordinates directly:

PointF point = new PointF();
point.x = 10.0f;
point.y = 20.0f;

Operations

The PointF class also includes several methods for manipulating points. These include:

• set(float x, float y): Sets the x and y coordinates of the point to the specified values.
• negate(): Negates the x and y coordinates of the point.
• offset(float dx, float dy): Offsets the x and y coordinates of the point by the specified amounts.
• length(): Calculates the distance between the point and the origin (0, 0).
• length(float x, float y): Calculates the distance between the point and the specified x and y coordinates.
• normalize(): Normalizes the point (i.e. scales it so that its length is 1).
• toString(): Returns a string representation of the point in the format "(x,y)".

Conclusion

In conclusion, the PointF class in Android provides a simple and convenient way to manipulate points in the 2D coordinate system. With its easy-to-use methods, it is a valuable tool for graphical applications on the Android platform.