edu.princeton.cs.algs4

Interface DrawListener

public interface DrawListener

DrawListener. This interface provides a basic capability for responding to keyboard in mouse events from Draw via callbacks. You can see some examples in Section 3.6.

For additional documentation, see Section 3.1 of Computer Science: An Interdisciplinary Approach by Robert Sedgewick and Kevin Wayne.

Author:

Robert Sedgewick, Kevin Wayne

Method Summary

Modifier and Type	Method and Description
default void	keyPressed(int keycode) Invoked when a key has been pressed.
default void	keyReleased(int keycode) Invoked when a key has been released.
default void	keyTyped(char c) Invoked when a key has been typed.
default void	mouseClicked(double x, double y) Invoked when the mouse has been clicked (pressed and released).
default void	mouseDragged(double x, double y) Invoked when the mouse has been dragged.
default void	mousePressed(double x, double y) Invoked when the mouse has been pressed.
default void	mouseReleased(double x, double y) Invoked when the mouse has been released.
default void	update() Gets called at regular time intervals.

Method Detail

mousePressed

default void mousePressed(double x,
                          double y)

Invoked when the mouse has been pressed.

Parameters:

x - the x-coordinate of the mouse

y - the y-coordinate of the mouse

mouseDragged

default void mouseDragged(double x,
                          double y)

Invoked when the mouse has been dragged.

Parameters:

x - the x-coordinate of the mouse

y - the y-coordinate of the mouse

mouseReleased

default void mouseReleased(double x,
                           double y)

Invoked when the mouse has been released.

Parameters:

x - the x-coordinate of the mouse

y - the y-coordinate of the mouse

mouseClicked

default void mouseClicked(double x,
                          double y)

Invoked when the mouse has been clicked (pressed and released). A mouse click is triggered only if the user presses a mouse button and then releases it quickly, without moving the mouse. It does not work with touch events. The mousePressed method is generally preferred for detecting mouse clicks.

Parameters:

x - the x-coordinate of the mouse

y - the y-coordinate of the mouse

keyTyped

default void keyTyped(char c)

Invoked when a key has been typed.

Parameters:

c - the character typed

keyPressed

default void keyPressed(int keycode)

Invoked when a key has been pressed.

Parameters:

keycode - the key combination pressed

keyReleased

default void keyReleased(int keycode)

Invoked when a key has been released.

Parameters:

keycode - the key combination released

update

default void update()

Gets called at regular time intervals.