Transitioning from 2d to 3d autocad drawings

Wednesday, August 20, 2008

Understanding Polar Coordinate Input


Many Autocad users have some troubles with angles. The reason beyond this is the lack of information about polar coordinate system. Examining the figure below, let us start to learn polar coordinate system.
Figure.1

Firstly, let us draw a coordinate plane and lines with entering length and angles. The formula for polar coordinate entry is: @length (between the X axis). The lentgh and angles of our lines let be 100 unit and 45 degress respectively.

To draw the first line, run the line command, click on our origin and enter;

@100<45 onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0S-jLZcrQJm7V2-1hRA2ZlNk19rPDBhCA80_EUmQnI_Jn7SPDJ2Q4yXvY5fW5sUjnvj23_VhaZ39od1a_FIfzflUoBYwVO9s3e4CIpUR7GVXt-iumhgHgLDClKbg0yLI4d9cZ5l3SCTE/s1600-h/polar_2.gif">Figure.2

The angle for the second line is 45 degrees less than 180.

Repeat line command and click on the origin.

Type ‘@100<135’ onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg92ZLpSk11ZJ0_AKxEeD2dJ6y3sAVGgUXwAnqiPZ9lFoN097LV8M_Vn31Ct3lKAoWwKYZadg-6ryBomrcHqarmSz-8VAXkT0HaPX61pI9czcXk6G0I7ziadbdxtyla1V4qu8hBOLey2hM/s1600-h/polar_3.gif">Figure.3

The angle for the third line is 45 degrees less than 270.

Repeat line command and click on the origin.

Type ‘@100<225’ onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuvmkHhTlrm2mykHIt8nR83b8rHeSgdP7iPcFwjKHCTW0QLhQJDSPPeuHQGmzwjtOAVjcMBEH0AmoSUHTmS9bzH5td2fmI-6ZT_DVi3P6cRyh1o54h_5nGAkEiVLB_mbVgRVXubNrqIAg/s1600-h/polar_4.gif">Figure.4

The angle for our last line is 45 degrees less than 360.

Type ‘@100<315’ onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHMz8Ufre5gDfteWsm4TnWc9leya5YeaCCHvoy6a0ekfIFQez_8wNcTMK8sXss2m8NWX0lIshJxu3FNOIWnO4pSKXrsCDdZdFNkIKqrNz0cnjMfLeKkLn6NpoX97X9mdzBIV2Ef2MX0Ig/s1600-h/polar_5.gif">Figure.5

All lines are drawn with respect to X axis. You should also draw the figure if you do everything mentioned above.

Regards.

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