[Newbies] Drawing a line on a morph

[Bert Freudenberg]

On 30.10.2009, at 11:52, Christine Wolfe wrote:

> drawOn: aCanvas
> super drawOn: aCanvas.
> (self perform: ('face', dieValue asString) asSymbol)
> do: [{:aPoint, anotherPoint} | self drawLineOn: aCanvas from: aPoint  
> to: anotherPoint]

In my version of Squeak this won't even compile.

How did you accept that method?

The curly-bracket array notation can not be used to extract multiple  
arguments. Instead, you would have to do something like this:

[:aPointPair | self drawLineOn: aCanvas from: aPointPair first to:  
aPointPair second]

And secondly, this expression is valid syntactically but does not do  
what you might expect:

> face1
> ^{{2 at 2, 2 at 10}, {2 at 2, 10 at 2}, {10 at 10, 2 at 10}, {10 at 10, 10 at 2}}

In non-literal Array notation, expressions must be separated by  
periods, not commas:

{{2 at 2. 2 at 10}. {2 at 2. 10 at 2}. {10 at 10, 2 at 10}. {10 at 10. 10 at 2}}

The way you would verify a line like this or your's above is you  
simply select it and press cmd-p so it will print the result. You can  
do this in any browser or workspace.

- Bert -