<snapdata remixID="8971227"><project name="U2L4 Brick wall" app="Snap! 5.1, http://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" volume="100" pan="0" lines="flat" ternary="true" codify="false" inheritance="true" sublistIDs="false" scheduled="false" id="1"><pentrails>data:image/png;base64,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</pentrails><costumes><list struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><sprite name="Sprite" idx="1" x="24" y="135" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="145,26,68,1" pen="tip" id="8"><costumes><list struct="atomic" id="9"></list></costumes><sounds><list struct="atomic" id="10"></list></sounds><blocks></blocks><variables></variables><scripts><script x="180" y="203"><block s="receiveGo"></block><block s="gotoXY"><l>0</l><l>0</l></block><block s="clear"></block><custom-block s="set flat line ends to %b"><l/></custom-block><custom-block s="draw brick, length: %n width: %n"><l>3</l><l>4</l></custom-block><custom-block s="draw Brick wall with %s rows width %s"><l>7</l><l>6</l></custom-block><custom-block s="row A wide %s Brick Length: %s brick width %s"><l>6</l><l>7</l><l>9</l></custom-block><custom-block s="row B wide %s brick L %s Brick Width %s gap width %s"><l>9</l><l>9</l><l>9</l><l></l></custom-block><custom-block s="draw Brick wall with %s rows width %s"><l>9</l><l>9</l></custom-block></script><script x="560" y="197"><custom-block s="is this %s odd?"><l>2</l></custom-block></script><script x="569" y="249"><custom-block s="is this # even? %s"><l></l></custom-block></script></scripts></sprite></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="set flag %&apos;which&apos; to %&apos;tf&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%s" readonly="true"><options>Presentation mode&#xD;Retina display support&#xD;Long form input dialog&#xD;Plain prototype labels&#xD;Input sliders&#xD;Execute on slider change&#xD;Clicking sound&#xD;Turbo mode&#xD;Flat design&#xD;Keyboard editing&#xD;Table support&#xD;Table lines&#xD;Visible stepping&#xD;Thread safe scripts&#xD;Prefer smooth animations&#xD;Flat line ends&#xD;Codification support&#xD;Inheritance support</options></input><input type="%b"></input></inputs><script><block s="doRun"><block s="reportJSFunction"><list><l>which</l><l>tf</l></list><l>var   stage = this.parentThatIsA(StageMorph),&#xD;        ide = stage.parentThatIsA(IDE_Morph),&#xD;        world = stage.parentThatIsA(WorldMorph);&#xD;&#xD;if (tf != !!tf) return;&#xD;&#xD;try{&#xD;ide.savingPreferences = false;&#xD;&#xD;switch (which) {&#xD;    case &apos;Presentation mode&apos;:&#xD;        if (tf != ide.isAppMode) ide.toggleAppMode();&#xD;        break;&#xD;    case &apos;Retina display support&apos;:&#xD;        if (tf != isRetinaEnabled()) ide.toggleRetina();&#xD;        break;&#xD;    case &apos;Long form input dialog&apos;:&#xD;        if (tf != InputSlotDialogMorph.prototype.isLaunchingExpanded)&#xD;            ide.toggleLongFormInputDialog();&#xD;        break;&#xD;    case &apos;Plain prototype labels&apos;:&#xD;        if (tf != BlockLabelPlaceHolderMorph.prototype.plainLabel)&#xD;            ide.togglePlainPrototypeLabels();&#xD;        break;&#xD;    case &apos;Input sliders&apos;:&#xD;        MorphicPreferences.useSliderForInput = tf;&#xD;        break;&#xD;    case &apos;Execute on slider change&apos;:&#xD;        ArgMorph.prototype.executeOnSliderEdit = tf;&#xD;        break;&#xD;    case &apos;Clicking sound&apos;:&#xD;        if (tf != !!BlockMorph.prototype.snapSound)&#xD;            BlockMorph.prototype.toggleSnapSound();&#xD;        break;&#xD;    case &apos;Turbo mode&apos;:&#xD;        if (tf != stage.isFastTracked)&#xD;            ide.toggleFastTracking();&#xD;        break;&#xD;    case &apos;Flat design&apos;:&#xD;        if (tf == MorphicPreferences.isFlat) break;&#xD;        if (tf)&#xD;            ide.flatDesign();&#xD;        else&#xD;            ide.defaultDesign();&#xD;        break;&#xD;    case &apos;Keyboard editing&apos;:&#xD;            ScriptsMorph.prototype.enableKeyboard = tf;&#xD;        break;&#xD;    case &apos;Table support&apos;:&#xD;            List.prototype.enableTables = tf;&#xD;        break;&#xD;    case &apos;Table lines&apos;:&#xD;                TableMorph.prototype.highContrast = tf;&#xD;        break;&#xD;    case &apos;Visible stepping&apos;:&#xD;        if (tf != Process.prototype.enableSingleStepping)&#xD;            ide.toggleSingleStepping();&#xD;        break;&#xD;    case &apos;Thread safe scripts&apos;:&#xD;        stage.isThreadSafe = tf;&#xD;        break;&#xD;    case &apos;Prefer smooth animations&apos;:&#xD;        if (tf != (StageMorph.prototype.frameRate &gt; 0))&#xD;            ide.toggleVariableFrameRate();&#xD;        break;&#xD;    case &apos;Flat line ends&apos;:&#xD;        SpriteMorph.prototype.useFlatLineEnds = tf;&#xD;        break;&#xD;    case &apos;Codification support&apos;:&#xD;        if (tf != StageMorph.prototype.enableCodeMapping) {&#xD;            StageMorph.prototype.enableCodeMapping = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;    case &apos;Inheritance support&apos;:&#xD;        if (tf != StageMorph.prototype.enableInheritance) {&#xD;            StageMorph.prototype.enableInheritance = tf;&#xD;            ide.currentSprite.blocksCache.variables = null;&#xD;            ide.currentSprite.paletteCache.variables = null;&#xD;            ide.refreshPalette();&#xD;        }&#xD;        break;&#xD;};&#xD;}&#xD;finally {&#xD;ide.savingPreferences = false;&#xD;};&#xD;</l></block><list><block var="which"/><block var="tf"/></list></block></script></block-definition><block-definition s="draw brick, length: %&apos;length&apos; width: %&apos;width&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input></inputs><script><block 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