求助
要做一个dxf格式到svg格式的转换，如果只读取dxf实体段中的信息，例如若处理直线时，只取其两个端点的值，再赋值到写入svg格式中:<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align=left><B><line x1="x1值" y1="y1值" x2="x2值" y2="y2值" </B><B>stroke-width="2" stroke="blue"/></B>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align=left>则svg中显示的直线会出现朝向（斜率）不同的情况。
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt" align=left>做了一个由48条直线构成的图形的转换，结果显示出来的图形是反的。所以想问一下，是不是光只是考虑实体段部分还是不够的阿，还有哪些地方需要注意的呢
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