point towards the mouse?

[Bill Kerr]

1) Is it possible to get an arrow to point towards the mouse pointer in etoys?

I can get it to point towards a box which is being moved with the mouse with this script: arrow's heading <-- arrow's bearing to box


In the world menu in the playfield pane there are mouse x and mouse y detectors but arrow's bearing will not accept those detectors as input to replace just the box part


2) I also wanted to detect a mouse click but can't see any way to do that. The input pane in the world menu detects last keystroke but not a mouse click.

[Hilaire Fernandes]

For point 2., you may have to write the script in Smalltalk mode then
use the code

ActiveHand x to get abscissa of the mouse pointer

Hilaire


2009/11/11 Bill Kerr <billkerr@gmail.com>:

[Hilaire Fernandes]

You may have to write something like that

script1
self
setHeading: (self costume referencePosition bearingToPoint:
ActiveHand x @ ActiveHand y)



This example does not work yet, but you get the idea.

Hilaire



2009/11/11 Hilaire Fernandes <hilaire.fernandes@edu.ge.ch>:

[Darius Clarke]

For point 1 you can use the slope formula m = (y1-y2)/(x1-x2) and then arcTan m to get degrees. 

arcTan may have to come from Smalltalk mode. 

Cheers,
Darius

On Tue, Nov 10, 2009 at 10:53 PM, Hilaire Fernandes <hilaire.fernandes@edu.ge.ch (hilaire.fernandes@edu.ge.ch)> wrote:

[Hilaire Fernandes]

I was meaning point1

Hilaire

2009/11/11 Hilaire Fernandes <hilaire.fernandes@edu.ge.ch>:

[Bill Kerr]

On Wed, Nov 11, 2009 at 7:32 PM, Scott Wallace <scott.wallace@squeakland.org (scott.wallace@squeakland.org)> wrote:

[p.a.dreyfuss@excite.com]

Hi,Bill

You'll find the tiles mouseX and mouseY in the playfield category of a playfield or of the world.

get an arrow fom object catalog/graphics

move the ble rotation handle sligtly to make te center or rotation visible and move it shift/drag to the foot of the arrow.
get the viewer of the arrow category polygon, et the arrow's vertex .cursor to 2 (head of the arrow).

now just build the tiles :

arrow's x at cursor _ playfield's mousex
arrow's y at cursor _ playfield's mousey

You probably just need to find where the tiles mouse and mousey were lying, but this will help other people.

Regards


-----Original Message-----
From: "Hilaire Fernandes" [hilaire.fernandes@edu.ge.ch]
Date: 11/11/2009 02:51 AM
To: "Bill Kerr" <billkerr@gmail.com>
CC: "squeakland.org mailing list" <squeakland@squeakland.org>
Subject: Re: [squeakland] point towards the mouse?

You may have to write something like that

script1
self
setHeading: (self costume referencePosition bearingToPoint:
ActiveHand x @ ActiveHand y)



This example does not work yet, but you get the idea.

Hilaire



2009/11/11 Hilaire Fernandes <hilaire.fernandes@edu.ge.ch>:

[Bill Kerr]

On Wed, Nov 11, 2009 at 8:38 PM, Scott Wallace <scott.wallace@squeakland.org (scott.wallace@squeakland.org)> wrote:

[rita]

Scott Wallace wrote:

[scott]

On Nov 11, 2009, at 2:20 AM, Bill Kerr wrote:

[Bill Kerr]

On Wed, Nov 11, 2009 at 8:09 PM, p.a.dreyfuss@excite.com (p.a.dreyfuss@excite.com) <p.a.dreyfuss@excite.com (p.a.dreyfuss@excite.com)> wrote:

[Bill Kerr]

On Wed, Nov 11, 2009 at 9:11 PM, Scott Wallace <scott.wallace@squeakland.org (scott.wallace@squeakland.org)> wrote:

[Hilaire Fernandes]

Shift-clic in the background display a menu with the list of morh ?

Hilaire

2009/11/11 Bill Kerr <billkerr@gmail.com>:

[Bert]

On 11.11.2009, at 12:13, Bill Kerr wrote:

[Bill Kerr]

On Thu, Nov 12, 2009 at 2:54 AM, Bert Freudenberg <bert@freudenbergs.de (bert@freudenbergs.de)> wrote: