<snapdata remixID="8907924"><project name="U3L1-brickwall" 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="false" 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="-1.6370904631912708e-11" y="252" 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="31.666666666666657" y="80.33333333333334"><custom-block s="draw brick, length: %n width: %n rows: %s bricks per row: %s"><l>100</l><l>10</l><l>6</l><l>6</l></custom-block></script><script x="556" y="451.79999999999995"><block s="forward"><block var="length"/></block></script><script x="711.000001" y="196.80000100000007"><custom-block s="rowB"></custom-block></script><script x="635.000001" y="269.80000100000007"><custom-block s="rowA"></custom-block></script><script x="15" y="172"><block s="gotoXY"><l>0</l><l>0</l></block><block s="clear"></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; rows: %&apos;rows&apos; bricks per row: %&apos;bricks&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input><input type="%s"></input><input type="%s"></input></inputs><script><block s="setColor"><color>145,26,68,1</color></block><custom-block s="set flat line ends to %b"><block s="reportBoolean"><l><bool>true</bool></l></block></custom-block><block s="setSize"><block 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s="reportQuotient"><block var="length"/><block var="bricks"/></block></block><block s="up"></block><block s="forward"><block s="reportQuotient"><block s="reportQuotient"><block var="length"/><block var="bricks"/></block><block var="bricks"/></block></block><block s="down"></block></script></block></script></block-definition><block-definition s="rowB" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs></block-definition></blocks><variables></variables></project><media name="U3L1-brickwall" app="Snap! 5.1, http://snap.berkeley.edu" version="1"></media></snapdata>