<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This is interesting and thank you for bringing this to our attention… I am unable to recreate this at the moment… Would it be possible to send to me directly (<a href="mailto:dslater@cmu.edu" class="">dslater@cmu.edu</a>) a copy of the world where this has happened?<div class=""><br class=""></div><div class="">What version of Alice, computer OS, you are using?</div><div class=""><br class=""></div><div class="">Thank you,</div><div class="">Don Slater</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 12, 2017, at 9:16 PM, robert durtschi via alice-teachers <<a href="mailto:alice-teachers@lists.andrew.cmu.edu" class="">alice-teachers@lists.andrew.cmu.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class="">Rare but annoying when it happens.</font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class="">We are doing an Alice world where we are using events to control a seaplane. There is no need for anything but events, so for a change I immediately deleted 'my first method' from "when the world starts" and changed the event to "while the world is running, during: seaplane move forward 1 meter.<span class="Apple-converted-space"> </span><br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class="">Later in the exercise we added a speed control:</font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""> create a Seaplane properties variable called "speed"</font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""> replace the 1 meter in "seaplane move forward 1 meter" with "speed meters"<br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""> choose two "when a key is pressed" 'A' and 'D' to "increment speed by 1" (Accelerate) and "decrement speed by 1" (Decelerate).<span class="Apple-converted-space"> </span><br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""> We needed a guard check to keep speed from going negative: "if speed > 0" decrement speed by 1<br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""><br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class="">That's when I realized that the 'universal' commands at the bottom of the edit window, including the if/else had disappeared along with the edit window for the "my first method" I created a method long enough to get the if/else back then deleted it again.</font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""><br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class="">Bob Durtschi<br class=""></font></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><font size="2" class=""></font><br class=""></div></div><span style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">alice-teachers mailing list</span><br style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:alice-teachers@lists.andrew.cmu.edu" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">alice-teachers@lists.andrew.cmu.edu</a><br style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="https://lists.andrew.cmu.edu/mailman/listinfo/alice-teachers" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://lists.andrew.cmu.edu/mailman/listinfo/alice-teachers</a></div></blockquote></div><br class=""></div></body></html>