Henrik, all, thanks for your help with this. I&#39;ve been away from the codeface for a while and haven&#39;t yet tried all of the fixes. I did get things rendering well by caching the form canvas and redrawing that when required (just as the HandMorph does - as I said, the rendering while dragging is always OK). Relevant code below:<div>
<br></div><div>&gt;&gt;&gt;&gt;</div><div><div>drawOn: aCanvas</div><div><span class="Apple-tab-span" style="white-space:pre">	</span>super drawOn: aCanvas.</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre">	</span>cachedCanvas isNil ifTrue: [</div>
<div><span class="Apple-tab-span" style="white-space:pre">		</span>cachedCanvas := (aCanvas allocateForm: self bounds extent) getCanvas.</div><div><span class="Apple-tab-span" style="white-space:pre">		</span>self drawContentsOn: cachedCanvas.</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>].</div><div><span class="Apple-tab-span" style="white-space:pre">	</span>aCanvas translucentImage: cachedCanvas form at: self bounds origin.</div></div><div>
&lt;&lt;&lt;&lt;</div><div><br></div><div>Best</div><div>David<br><div><br></div><div><br clear="all">------------------<br>David Harvey<br><a href="http://www.teamsandtechnology.com">www.teamsandtechnology.com</a><br><a href="http://www.cateams.com">www.cateams.com</a><br>
@david_harvey<br>
<br><br><div class="gmail_quote">On 7 April 2010 12:45, David Harvey <span dir="ltr">&lt;<a href="mailto:david@teamsandtechnology.com">david@teamsandtechnology.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi list,<div><br></div><div>I&#39;m writing a little charting morph, and while playing with rotating text for axis labels came across something which I&#39;ve noted in Morphs text handling a couple of times.�</div><div><br>

</div><div>If I apply a transform in a drawing operation, rotated text _appears_ to be drawn twice, slightly offset, giving a scrappy bold look. It seems only to do this when drawing on a form canvas that&#39;s backed onto the display: if you pick and drag the morph, the text is rendered beautifully.</div>

<div><br></div><div>The test morph attached isolates the problem. The transcript logging is an attempt to see what might be happening: looking at the output it appears that there are circumstances in which the during: block is invoked twice.</div>

<div><br></div><div>Any thoughts?</div><div><br></div><div>David</div><div><br clear="all">------------------<br>David Harvey<br><a href="http://www.teamsandtechnology.com" target="_blank">www.teamsandtechnology.com</a><br>
<a href="http://www.cateams.com" target="_blank">www.cateams.com</a><br>
@david_harvey<br>
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</blockquote></div><br></div></div>