<snapdata remixID="8927607"><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 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="250" y="30" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="8,5,0,1" 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="45" y="10"><block s="clear"></block></script><script x="392" y="234"><block s="doDeclareVariables"><list><l>y value</l></list></block><block s="doSetVar"><l>y value</l><l>-170</l></block><block s="doRepeat"><l>5</l><script><block s="gotoXY"><l>-230</l><block var="y value"/></block><block s="doRepeat"><l>6</l><script><custom-block s="draw black square size %n"><l>40</l></custom-block><custom-block s="draw red square size %n"><l>40</l></custom-block></script></block><block s="doChangeVar"><l>y value</l><l>40</l></block><block s="gotoXY"><l>-230</l><block var="y value"/></block><block s="doRepeat"><l>6</l><script><custom-block s="draw red square size %n"><l>40</l></custom-block><custom-block s="draw black square size %n"><l>40</l></custom-block></script></block></script></block></script><script x="134" y="153"><block s="gotoXY"><l>-230</l><l>-130</l></block><custom-block s="draw black square size %n"><l>40</l></custom-block><custom-block s="draw red square size %n"><l>40</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 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><block var="flag"/></custom-block></script></block-definition><block-definition s="draw black square size %&apos;size&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="setColor"><color>8,5,0,1</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="size"/></block><block s="down"></block><block s="forward"><block var="size"/></block><block s="up"></block></script></block-definition><block-definition s="draw red square size %&apos;size&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="setColor"><color>255,47,31,1</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="size"/></block><block s="down"></block><block s="forward"><block var="size"/></block><block s="up"></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>