<snapdata remixID="8928362"><project name="U2L4-checkerboard_SV" 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 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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: 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s="up"></block></script></block-definition><block-definition s="Draw Checkerboard" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doDeclareVariables"><list><l>y value</l></list></block><block s="doSetVar"><l>y value</l><l>0</l></block><block s="doFor"><l>row</l><l>1</l><l>2</l><script><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="draw black square size %n"><l>45</l></custom-block></script><script><custom-block s="draw red square size %n"><l>45</l></custom-block></script></block><block s="doChangeVar"><l>y value</l><l>15</l></block></script></block></script><scripts><script x="241" y="93"><block s="gotoXY"><l>-191</l><l>-137</l></block></script><script x="229" y="44"><block s="doRepeat"><l>2</l><script><block s="doDeclareVariables"><list><l>y value</l></list></block><block s="doSetVar"><l>y value</l><l>1</l></block><block s="doFor"><l>row</l><l>1</l><l>8</l><script><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="black"></custom-block></script><script><custom-block s="red"></custom-block></script></block><block s="doChangeVar"><l>y value</l><l>30</l></block></script></block></script></block></script><script x="34.000001999999995" y="253.00000199999988"><custom-block s="black"></custom-block><custom-block s="red"></custom-block></script></scripts></block-definition><block-definition s="black" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doRepeat"><l>4</l><script><custom-block s="draw black square size %n"><l>45</l></custom-block><custom-block s="draw red square size %n"><l>45</l></custom-block></script></block></script></block-definition><block-definition s="red" type="command" category="pen"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doRepeat"><l>4</l><script><custom-block s="draw red square size %n"><l>45</l></custom-block><custom-block s="draw black square size %n"><l>45</l></custom-block></script></block></script></block-definition><block-definition s="Draw Wall with %&apos;number&apos; rows" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doDeclareVariables"><list><l>y value</l></list></block><block s="doSetVar"><l>y value</l><l>0</l></block><block s="doFor"><l>row</l><l>1</l><block var="number"/><script><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="black"></custom-block></script><script><custom-block s="red"></custom-block></script></block><block s="doChangeVar"><l>y value</l><l>15</l></block></script></block></script><scripts><script x="204.000002" y="87.00000199999994"><custom-block s="draw black square size %n"><l>45</l></custom-block></script><script x="193.000002" y="142.8333353333332"><custom-block s="draw red square size %n"><l>45</l></custom-block></script></scripts></block-definition><block-definition s="draw wall %&apos;num&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doDeclareVariables"><list><l>y value</l></list></block><block s="doSetVar"><l>y value</l><l>0</l></block><block s="doFor"><l>row</l><l>1</l><l>8</l><script><block s="doIfElse"><block s="reportEquals"><block s="reportModulus"><block var="row"/><l>2</l></block><l>1</l></block><script><custom-block s="draw red square size %n"><l>45</l></custom-block></script><script><custom-block s="draw black square size %n"><l>45</l></custom-block></script></block><block s="doChangeVar"><l>y value</l><l>15</l></block></script></block></script></block-definition></blocks><variables></variables></project><media name="U2L4-checkerboard_SV" app="Snap! 5.1, http://snap.berkeley.edu" version="1"></media></snapdata>