[Newbies] Re: Project on squeak language

Mon Aug 22 17:57:45 UTC 2016

From: Joseph Alotta
Sent: Monday, August 22, 2016 1:50 PM

Is //modification a new way of doing comments?

[Ron Teitelbaum] 

Good question Joe,

I assumed it was added to the email and not to code.

The comments would require quotes: " this is a comment "

All the best,

Ron Teitelbaum

Sent from my iPhone 

On Aug 22, 2016, at 11:45 AM, Ron Teitelbaum [via Smalltalk] <[hidden
email]> wrote:

Hi Roger!  

That was a nice try!

I modified methods:

addCustomMenuItems: aCustomMenu hand: aHandMorph
    super addCustomMenuItems: aCustomMenu hand:  aHandMorph.
    aCustomMenu add: 'clear' action: #clear.
    drawColor := Color red.                    //modification
    drawColor := Color yellow.                //modification
    drawColor := Color green.                 //modification
    drawColor := Color blue.                   //modification

[Ron Teitelbaum]

What this does is create a menu with one item clear and then it sets the
drawColor to red yellow green and then blue.  Since blue is the last color
you end up with blue.

Try creating drawRed, drawYellow, drawGreen, and drawBlue methods

For example

drawRed

               drawColor := Color red.

Now add to your menu properly.

aCustomMenu add: 'clear' action: #clear.
aCustomMenu add: 'red' action: #drawRed.

Where add is what you see in your menu and action is what happens when you
select the menu item.  (it calls: self drawRed)

Do that with all your colors and you should be all set!

You can also add menu items to adjust the size of the brush.  Maybe make
small brush, medium brush and large brush menu items?  Works the same way as
changing color.  You need a brushSize instance variable. And initialize
brushSize := 2.

All the best,

Ron Teitelbaum

initialize
    super initialize.
    self extent: 500 at 700.
    drawColor := Color black.

mouseDown: evt
    brush := Pen newOnForm: form.
    brush roundNib: 2.
    brush color: drawColor.
//modification
    lastMouse := evt cursorPoint - bounds origin.
    brush drawFrom: lastMouse to: lastMouse.
    self invalidRect:
    ((lastMouse - brush sourceForm extent corner:
    lastMouse + brush sourceForm extent)
    translateBy: bounds origin).

The initial color is black.

When i click the command "change color" on the menu  and i chose for example
the green color, the result is the blue color. I don't understand why ?

And after the first choice, i must restart the program with the Workspace
for change another color. So i can't make several choices at the same time.

How can I solve these problems ? and to change size of the brush ? 

Thank you in advance.

2016-08-21 3:14 GMT+02:00 Ron Teitelbaum <[hidden email]>:

From: roger mpouma
Sent: Saturday, August 20, 2016 2:42 PM

How can i make  this please ?

I thought to add "color" and "size" commands as "clear" command in the
custom menu code. After that, add "color" and "size" methods...

[Ron Teitelbaum] 

What I was thinking is making buttons on the panel. Color buttons with a
highlight around it so you can see what is selected.  You could instead add
something like Red or Blue to the menu.

On your class add some instance variable called drawColor or something like
that.

When the menu item Red is called you would do 

drawColor := Color red.

Then in mouseDown:

    brush color: drawColor.

Initialize your color to something like black

Initialize

               drawColor := Color black.

So that the user is not required to use the menu to get the default color
(black).

Hope that helps,

Ron

2016-08-20 20:26 GMT+02:00 Ron Teitelbaum <[hidden email]>:

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: [hidden email] [mailto:[hidden email]] 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 at 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 <[hidden email]>:

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 <[hidden email]> 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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