Hi!
I have made complex things with get X get Y and get rotation yet I have no idea how to make an event so that when the mouse clicks on an object it does something. Can anyone help?
h123n wrote ...
2012/5/19
Help for mouse.
Thanks!!! can someone tell me how to make it so that you can drag the item? here is my code in case you are need it.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class bear here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class bear extends Actor
{
/**
* Act - do whatever the bear wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
if(Greenfoot.mouseClicked(this)) {
move(4);
}
}
}
Do something like this:
This creates a new MouseInfo object, and you can ask questions to this about the mouse: including the location.
Then, we set our location to the location of the mouse.
if (Greenfoot.mouseClicked(this)) {
MouseInfo info = Greenfoot.getMouseInfo();
setLocation(info.getX(), info.getY());
}
You need an instance boolean variable (or field) to track 'mouse pressed on me, and not yet released' or 'dragging'. Set it to 'true' if mouse pressed on this object. Set it to 'false' if the mouse is clicked (released) anywhere (use 'null' as parameter). Write an 'if' block to follow the mouse (SPower's code, but using 'if (dragging && Greenfoot.mouseMoved(null)) {' in line 1).
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