交互式算盘模型
2020-10-31 17:42
本范例展示了一个可交互的算盘模型。用户可以通过拖动珠子来模拟真实的算盘拨珠操作，直观地理解算盘的结构与计数原理。该模型利用GeoGebra的几何作图功能构建，包含多边形、线段和点等基础对象，并通过序列和镜像等命令实现珠子的排列与移动，是学习传统计算工具和基础几何作图的优秀演示。
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</element>
<command name="Element" type="conic">
<input a0="l9" a1="2" a2="5"/>
<output a0="B5"/>
</command>
<element type="conic" label="B5">
<show object="true" label="false" ev="4"/>
<objColor r="0" g="0" b="0" alpha="1.0"/>
<layer val="2"/>
<labelMode val="0"/>
<auxiliary val="true"/>
<ggbscript val="SetVisibleInView(B1,1,true)
SetVisibleInView(B2,1,true)
SetVisibleInView(B3,1,true)
SetVisibleInView(B4,1,true)
SetVisibleInView(B5,1,false)
SetVisibleInView(B6,1,true)"/>
<lineStyle thickness="3" type="0" typeHidden="1" opacity="178"/>
<eigenvectors x0="1.0" y0="0.0" z0="1.0" x1="-0.0" y1="1.0" z1="1.0"/>
<matrix A0="1.0" A1="2.9726516052318672" A2="25.025790725326992" A3="0.0" A4="5.0" A5="-0.7431629013079668"/>
<eqnStyle style="specific"/>
</element>
<expression label="l5" exp="{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M"}"/>
<element type="list" label="l5">
<show object="false" label="false"/>
<objColor r="0" g="100" b="0" alpha="0.0"/>
<layer val="2"/>
<labelMode val="0"/>
<animation step="1" speed="1" type="0" playing="false"/>
<lineStyle thickness="5" type="0" typeHidden="1"/>
<pointSize val="5"/>
<angleStyle val="0"/>
<symbolic val="true" />
</element>
<command name="Flatten">
<input a0="Sequence[Sequence["SetVisibleInView(" + (l5(j)) + (i) + ",1,true)", i, 1, 8], j, 1, 13]"/>
<output a0="l6"/>
</command>
<element type="list" label="l6">
<show object="false" label="false"/>
<objColor r="0" g="100" b="0" alpha="0.0"/>
<layer val="2"/>
<labelMode val="0"/>
<lineStyle thickness="5" type="0" typeHidden="1"/>
<pointSize val="5"/>
<angleStyle val="0"/>
</element>
<command name="Flatten">
<input a0="Sequence[Sequence["SetVisibleInView(" + (l5(j)) + (i) + ",1,false)", i, 6, 7], j, 1, 13]"/>
<output a0="l7"/>
</command>
<element type="list" label="l7">
<show object="false" label="false"/>
<objColor r="0" g="100" b="0" alpha="0.0"/>
<layer val="2"/>
<labelMode val="0"/>
<lineStyle thickness="5" type="0" typeHidden="1"/>
<pointSize val="5"/>
<angleStyle val="0"/>
</element>
<element type="button" label="button1">
<show object="true" label="true"/>
<objColor r="255" g="255" b="255" alpha="1.0"/>
<bgColor r="153" g="51" b="0" alpha="255"/>
<layer val="2"/>
<labelOffset x="153" y="126"/>
<labelMode val="0"/>
<animation step="0.1" speed="1" type="0" playing="false"/>
<auxiliary val="true"/>
<ggbscript val="Execute(l6)
Execute(l7)"/>
<font serif="true" sizeM="1.4" size="6" style="1"/>
<startPoint x="-6.951202356714788" y="2.493729985336005" z="1.0"/>
<caption val="清盘"/>
</element>
</construction>
</geogebra>