James123 Posted February 17, 2010 Share Posted February 17, 2010 I'm looking for a little help to do a specific rotation, its two parallel lines meant to represent a beam, one through the corner points of a square, one offset from the first by 50mm. now i need to rotate both lines so that the original top left corner is still in the same place, but the second line now intersects with the bottom right corner, the beam obviously has to stay in scale and so forth. I have tried the rotate function, and allign, but cant seem to get the exact result I want, the second line always ends up offset from the corner because it's ligning up the end of that line with the corner of the square, rather than along the length. I have attached a little pic of what I'm trying to do, as my descriptive powers are not the best. Any suggestions would be very much appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
Tiger Posted February 17, 2010 Share Posted February 17, 2010 If I understand you correctly you should be able to use Rotate > Reference The sequence as follows ROTATE Select objects: select the lines to rotate Specify base point:pick top left corner Specify rotation angle or [Copy/Reference] : type R for reference Specify the reference angle : click at the top left corner Specify second point:click somewhere along the line Specify the new angle or [Points]: click at bottom right corner Quote Link to comment Share on other sites More sharing options...
lpseifert Posted February 17, 2010 Share Posted February 17, 2010 Try this draw a circle from upper left corner to lower right corner Align > pick the lines 1st source point > UL corner 1st destination point > UL corner 2nd source point > intersection of circle and 2nd line 2nd destination point > lower right corner if it isn't exact, it's pretty dang close Quote Link to comment Share on other sites More sharing options...
eldon Posted February 17, 2010 Share Posted February 17, 2010 I have to do this sort of rotation where the centre of rotation is offset, so I draw a temporary circle to help. Centred on A, draw a circle radius to B. Now start Rotate and select the two lines, the base point is A, then option Reference, specify the reference angle - pick the points A then C, then new angle is at B. Finally erase circle. Quote Link to comment Share on other sites More sharing options...
James123 Posted February 17, 2010 Author Share Posted February 17, 2010 Thanks heaps Ipseifert and Eldon, both your suggestions work, it was the vital step of scribing the circle to get the correct reference point on the second line that I was missing. Cheers! Quote Link to comment Share on other sites More sharing options...
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