<snapdata remixID="8709550"><project name="L09 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="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="-120" y="-50" 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="10" y="38.333333333333314"><block s="clear"></block><block s="gotoXY"><l>-120</l><l>100</l></block><block s="setHeading"><l>90</l></block><custom-block s="draw wall with %n rows"><l>10</l></custom-block></script><script x="23" y="182"><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;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></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 var="width"/></block><block s="down"></block><block s="forward"><block var="length"/></block><block s="up"></block></script></block-definition><block-definition s="set flat line ends to %&apos;flag&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%b"></input></inputs><script><custom-block s="set flag %s to %b"><l>Flat line ends</l><l><bool>true</bool></l></custom-block></script></block-definition><block-definition s="row A" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doRepeat"><l>5</l><script><custom-block s="draw brick, length: %n width: %n"><l>30</l><l>10</l></custom-block><block s="forward"><l>5</l></block></script></block><custom-block s="draw brick, length: %n width: %n"><l>30</l><l>10</l></custom-block></script></block-definition><block-definition s="draw wall with %&apos;numrows&apos; rows" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doFor"><l>i</l><l>1</l><block var="numrows"/><script><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="i"/><l>2</l></block><l>1</l></block><script><custom-block s="row A"></custom-block><block s="changeYPosition"><l>-15</l></block><block 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