核能辐射符号的几何构造
2019-11-21 16:59
本GeoGebra范例展示了如何利用几何作图方法绘制核能辐射符号。通过运用圆、圆弧、交点、线段以及旋转变换和轨迹等核心命令，精确构造出该符号的三个对称叶片与中心圆。此案例直观呈现了圆的几何性质与旋转对称性，是学习基础几何作图与图形变换的优秀演示。
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<show object="true" label="false" ev="4"/>
<objColor r="0" g="0" b="0" alpha="1.0"/>
<layer val="3"/>
<labelMode val="0"/>
<auxiliary val="false"/>
<lineStyle thickness="5" type="0" typeHidden="1" opacity="178"/>
</element>
<command name="Locus">
<input a0="C_5" a1="C_1"/>
<output a0="loc3"/>
</command>
<element type="locus" label="loc3">
<show object="true" label="false" ev="4"/>
<objColor r="0" g="0" b="0" alpha="1.0"/>
<layer val="3"/>
<labelMode val="0"/>
<auxiliary val="false"/>
<lineStyle thickness="5" type="0" typeHidden="1" opacity="178"/>
</element>
<expression label ="h" exp="y = 0" type="line"/>
<element type="line" label="h">
<show object="false" label="false" ev="4"/>
<objColor r="0" g="0" b="0" alpha="0.0"/>
<layer val="4"/>
<labelMode val="0"/>
<animation step="1" speed="1" type="0" playing="false"/>
<coords x="0.0" y="1.0" z="0.0"/>
<lineStyle thickness="5" type="0" typeHidden="1" opacity="178"/>
<eqnStyle style="explicit"/>
</element>
<command name="Point">
<input a0="h"/>
<output a0="B"/>
</command>
<element type="point" label="B">
<show object="true" label="true" ev="4"/>
<condition showObject="a"/>
<objColor r="255" g="0" b="0" alpha="0.0"/>
<layer val="4"/>
<labelMode val="0"/>
<animation step="0.1" speed="1" type="1" playing="false"/>
<coords x="1.2966666666666709" y="-0.0" z="1.0"/>
<pointSize val="5"/>
<pointStyle val="0"/>
</element>
<command name="Point">
<input a0="h"/>
<output a0="E"/>
</command>
<element type="point" label="E">
<show object="true" label="true" ev="4"/>
<condition showObject="a"/>
<objColor r="255" g="0" b="0" alpha="0.0"/>
<layer val="4"/>
<labelMode val="0"/>
<animation step="1" speed="1" type="1" playing="false"/>
<coords x="7.0" y="-0.0" z="1.0"/>
<pointSize val="5"/>
<pointStyle val="0"/>
</element>
<command name="Point">
<input a0="h"/>
<output a0="F"/>
</command>
<element type="point" label="F">
<show object="true" label="true" ev="4"/>
<condition showObject="a"/>
<objColor r="255" g="0" b="0" alpha="0.0"/>
<layer val="4"/>
<labelMode val="0"/>
<animation step="1" speed="1" type="1" playing="false"/>
<coords x="8.0" y="-0.0" z="1.0"/>
<pointSize val="5"/>
<pointStyle val="0"/>
</element>
<element type="boolean" label="a">
<value val="true"/>
<show object="true" label="true"/>
<objColor r="0" g="0" b="0" alpha="0.0"/>
<layer val="0"/>
<labelOffset x="70" y="93"/>
<labelMode val="4"/>
<checkbox fixed="true"/>
<caption val="點"/>
</element>
</construction>
</geogebra>