Have you considered having a menu bar with colors and line sizes.  The users 
can select the color and line size which will change your program to use those 
settings.

 

All the best,

 

Ron Teitelbaum

 

From: beginners-boun...@lists.squeakfoundation.org 
[mailto:beginners-boun...@lists.squeakfoundation.org] On Behalf Of roger mpouma
Sent: Saturday, August 20, 2016 1:51 PM
To: A friendly place to get answers to even the most basic questions about 
Squeak.
Subject: Re: [Newbies] Project on squeak language

 

I have already implemented the canvas on which we draw, the possibility of 
drawing with the brush but with only a single color and a single size, a 
capacity to erase what we have already drawn with the "Clear" command on the 
custom menu code. 
So, i'd like to add the possibility of changing the color and the size of the 
brush presenting the choices of color and brush size.

The differents methods are:

"Methods"

extent: aPoint
    | newForm |
    super extent: aPoint.
    newForm := Form extent: self extent depth: 16.
    newForm fillColor: Color veryLightGray.
    form ifNotNil: [form displayOn: newForm].
    form := newForm.
     
     
initialize
    super initialize.
    self extent: 500@350.
     
drawOn: aCanvas
    aCanvas image: form at: bounds origin.
     
handlesMouseDown: evt
    ^ true     
     
mouseDown: evt
    brush := Pen newOnForm: form.
    brush roundNib: 3.
    brush color: Color red.
    lastMouse := evt cursorPoint - bounds origin.
    brush drawFrom: lastMouse to: lastMouse.
    self invalidRect:
    ((lastMouse - brush sourceForm extent corner:
    lastMouse + brush sourceForm extent)
    translateBy: bounds origin).
     
     
mouseMove: evt
    | p |
    p := evt cursorPoint - bounds origin.
    p = lastMouse ifTrue: [^ self].
     brush drawFrom: lastMouse to: p.
    self invalidRect: ((
        ((lastMouse min: p) - brush sourceForm extent) corner:
        ((lastMouse max: p) + brush sourceForm extent))
            translateBy: bounds origin).
    lastMouse := p.
     
     
addCustomMenuItems: aCustomMenu hand: aHandMorph
    super addCustomMenuItems: aCustomMenu hand: aHandMorph.
    aCustomMenu add: 'clear' action: #clear.
     
     
clear
    form fillColor: Color veryLightGray.
    self changed.

"Class PaintMorph"

Morph subclass: #PaintMorph
    instanceVariableNames: 'form brush lastMouse'
    classVariableNames: ''
    poolDictionaries: ''
    category: 'Morphic-Fun'

"Workspace"
PaintMorph new openInWorld.

 

Thank you in advance.

 

2016-08-20 18:47 GMT+02:00 Bert Freudenberg <b...@freudenbergs.de>:

Sure. Just ask some specific questions - e.g. what you tried, what worked, what 
didn't etc.

 

- Bert -

 

On Sat, Aug 20, 2016 at 10:59 AM, roger mpouma <rmpo...@gmail.com> wrote:

Hello, 
I need help for a drawing project on Squeak. I'd like implement a canvas on 
which we draw with the possibility of drawing with brush changing the color and 
size of the brush. Is it possibile to have help ?

Thank you in advance. 

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