Old smalltalker is slightly lost

15 years ago I did a lot in Smalltalk, and have done some recreational meta programming along the way. However, I now wanted to do something where I was in need of drawing a diagram with x and y axes on what I presume might be called a Canvas.

I lack a simple tutorial to get me started. I have looked at many, but they seem to presume I want to draw on the world "openInWorld". I should like not to scatter my world with line fragments and points, but keep it inside a "normal" window with borders, a background color (i.e. not a see through window).
I have gone dead in two approaches.

First attempt is to use a SystemWindow, and then draw on the canvas I presume is there somewhere. I have just not been able to figure out how to find the canvas of that SystemWindow, nor what method presumeable does the painting.

Second attempt is to use a SystemWindow, and then add (addMorph:) line and circle morphs for my diagram.  But it seems something is missing in my understanding there as well.

While it is fun that I can open circles and other stuff in "world", it is not what I need.

Small hits or direct solutions more than welcome.

-- Kasper

Hi,

ExampleMorph new openInWindow

Kasper,

"Canvas" is a good name, and is (IMHO at least) exactly what want, on a bitmap, aka a Form.  Look at Form class>>dotOfSize: for an example of drawing.  #getCanvas produces what you want.

My default image is littered with messages called #show, such as

Form>>show

        | shell |

        shell := StandardWindow new.
        shell
                addMorph:( shell newImage:self )
                fullFrame:(LayoutFrame fractions:(0@0 corner: 1@1)).
        shell openInWorld.

With the above compiled in Form, you can use

   ( ColorForm dotOfSize:50 ) show.

(note the use of ColorForm vs. Form) to display the dot in a window.

Also, check out Painter (Archetype Polymorph Application) in http://book.pharo-project.org/book.

Bill


________________________________________
From: [hidden email] [[hidden email]] on behalf of KasperOsterbye [[hidden email]]
Sent: Tuesday, December 13, 2011 11:59 AM
To: [hidden email]
Subject: [Pharo-project] Old smalltalker is slightly lost

15 years ago I did a lot in Smalltalk, and have done some recreational meta
programming along the way. However, I now wanted to do something where I was
in need of drawing a diagram with x and y axes on what I presume might be
called a Canvas.

I lack a simple tutorial to get me started. I have looked at many, but they
seem to presume I want to draw on the world "openInWorld". I should like not
to scatter my world with line fragments and points, but keep it inside a
"normal" window with borders, a background color (i.e. not a see through
window).
I have gone dead in two approaches.

First attempt is to use a SystemWindow, and then draw on the canvas I
presume is there somewhere. I have just not been able to figure out how to
find the canvas of that SystemWindow, nor what method presumeable does the
painting.

Second attempt is to use a SystemWindow, and then add (addMorph:) line and
circle morphs for my diagram.  But it seems something is missing in my
understanding there as well.

While it is fun that I can open circles and other stuff in "world", it is
not what I need.

Small hits or direct solutions more than welcome.

-- Kasper

--
View this message in context: http://forum.world.st/Old-smalltalker-is-slightly-lost-tp4191137p4191137.html
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On 13.12.2011 17:59, KasperOsterbye wrote: Try MemoryMonitor from squeaksource, it includes a very simple and
elegant graphing morph.
Best one I know of at least.
http://squeaksource.com/MemoryMonitor/

Cheers,
Henry

Hi kasper

Welcome :) I hope you are going well.
Do you need interaction with the forms you will draw?
Do you want to define your own interaction?
Do you just want to draw on the canvas?

to get a canvas

        Display getCanvas fillRectangle: (0@0 corner: 100@100) color: Color red
Have a look at Canvas Api (it is vintage but works).

We are about to release a new canvas to support vector graphics

Stef


On Dec 13, 2011, at 5:59 PM, KasperOsterbye wrote:

Depending on your needs you might like
http://squeak.preeminent.org/tut2007/html/index.html

KasperOsterbye wrote:

Thanks all,

It was in essence the drawOn: method I had not been able to figure out as the key, and some misunderstandings on the corners specifications of nested morphs. All your hints summarized to me getting going (and of cause the browsing of all the stuff in the image).

Best,

Kasper

pay attention morph position is doomed (global instead of local).

Stef


On Dec 16, 2011, at 9:16 AM, Kasper Østerbye wrote:

> Thanks all,
>
> It was in essence the drawOn: method I had not been able to figure out as the key, and some misunderstandings on the corners specifications of nested morphs. All your hints summarized to me getting going (and of cause the browsing of all the stuff in the image).
>
> Best,
>
> Kasper