I think you might need to call SymbolArray>>intialize by your self.<div><br></div><div>If you look at the chain of message sends starting from 'SymbolArray new'</div><div>1) OrderedCollection new</div><div>2) OrderedCollection new:</div>
<div>3) Behavior basicNew</div><div><br></div><div>There is no call to initialize.</div><div><br><div class="gmail_quote">On Sat, Nov 7, 2009 at 16:28, Christine Wolfe <span dir="ltr"><<a href="mailto:cwdw01@earthlink.net">cwdw01@earthlink.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal">I want to put add an imageMorph on top of another
imageMorph.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I can do this with the following method (note SymbolBlank is
an imageMorph</p>
<p class="MsoNormal">MyBoard>>addSymbol</p>
<p class="MsoNormal">|im|</p>
<p class="MsoNormal">im := SymbolBlank new.</p>
<p class="MsoNormal">self addMorph: im.</p>
<p class="MsoNormal">im topLeft: 2@2.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I want to enhance this so I can choose one of a collection
of imageMorphs to add.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I created a class, SymbolArray, that is a subclass of
OrderedCollection with the following initialize method. Each of the items I’m
adding (SymbolBlank, SymbolGet, etc) is an imageMorph.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">SymbolArray>>initialize</p>
<p class="MsoNormal">super initialize.</p>
<p class="MsoNormal">self add: SymbolBlank new.</p>
<p class="MsoNormal">self add: SymbolGet new.</p>
<p class="MsoNormal">self add: SymbolProcess new.</p>
<p class="MsoNormal">self add: SymbolPut new.</p>
<p class="MsoNormal">self add: SymbolIf new.</p>
<p class="MsoNormal">self add: SymbolWhile new.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Then I tried to modify the addSymbol method as show below.</p>
<p class="MsoNormal">When I do, I get the following error message which sounds
like I don’t have an element at index 1…</p>
<p class="MsoNormal">SymbolArray(OrderedCollection)>>errorNoSuchElement</p>
<p class="MsoNormal">SymbolArray(OrderedCollection)>>at:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">| sa si |</p>
<p class="MsoNormal">sa := SymbolArray new.</p>
<p class="MsoNormal">si := sa at: 1.</p>
<p class="MsoNormal">self addMorph: si.</p>
<p class="MsoNormal">si topLeft: 2@2.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I hope someone can help me figure out how to accomplish what
I want to do.</p>
<p class="MsoNormal"> </p>
</div>
</div>
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<br></blockquote></div><br></div>