<snapdata remixID="8928349"><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 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struct="atomic" id="2"></list></costumes><sounds><list struct="atomic" id="3"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites><watcher scope="Sprite" s="yPosition" style="normal" x="10" y="10" color="74,108,212"/><watcher scope="Sprite" s="xPosition" style="normal" x="10" y="31.000001999999995" color="74,108,212"/><watcher scope="Sprite" s="direction" style="normal" x="10" y="52.00000399999999" color="74,108,212" hidden="true"/><sprite name="Sprite" idx="1" x="80" y="0" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="255,47,31,1" pen="tip" id="11"><costumes><list struct="atomic" id="12"></list></costumes><sounds><list struct="atomic" id="13"></list></sounds><blocks></blocks><variables></variables><scripts><script x="23" y="10"><block s="clear"></block></script><script x="140" y="232.66666666666666"><custom-block s="draw checkerboard"></custom-block></script><script x="195" y="47.66666666666666"><block s="gotoXY"><l>0</l><l>0</l></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><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><l>row</l></list></block><block s="clear"></block><block s="doSetVar"><l>row</l><l>1</l></block><block s="doSetVar"><l>y value</l><l>-150</l></block><block s="gotoXY"><l>-150</l><l>-150</l></block><block s="doChangeVar"><l>y value</l><l>40</l></block><block s="doChangeVar"><l>row</l><l>1</l></block><block s="down"></block><block s="doIfElse"><custom-block s="even? %n"><block var="row"/></custom-block><script><block s="doRepeat"><l>4</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></script><script><block s="doRepeat"><l>4</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></block-definition><block-definition s="%&apos;number&apos; divisible by %&apos;divisor&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input><input type="%n"></input></inputs><script><block s="doReport"><block s="reportEquals"><block s="reportModulus"><block var="number"/><block var="divisor"/></block><l>0</l></block></block></script></block-definition><block-definition s="even? %&apos;number&apos;" type="predicate" category="operators"><header></header><code></code><translations></translations><inputs><input type="%n"></input></inputs><script><block s="doIfElse"><custom-block s="%n divisible by %n"><block var="number"/><l>2</l></custom-block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script><script><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></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>