# Picture environment in latex. How can I use the same length but

I am using the picture environment and this comes from a pdf I found online about it

The picture environment has one mandatory argument, which specifies the size of the picture. The environment produces a rectangular box with width and height determined by this argument’s two values. The picture environment also has an optional position argument, following the size argument, that can change the origin. (Unlike ordinary optional arguments, this argument is not contained in square brackets.) The optional argument gives the coordinates of the point at the lower-left corner of the picture (thereby determining the origin). For example, if \unitlength has been set to 1mm, the command \begin{picture}(100,200)(10,20) produces a picture of width 100 millimeters and height 200 millimeters, whose lower-left corner is the point (10,20) and whose upper-right corner is therefore the point (110,220).

Is there any way I could use the same length (e.g. 100mm) but with numbers from -3 to 3?So I want the start to be (-3,0) and the end (3,200) So some sort of scaling on the x-axis perhaps?

• Do you have to have unequal scaling in x and y directions? it is trivial to go from (-3,0) to (3,6) if \unitlength=100mm/6 but having unequal scaling would require redefining large parts of picture mode internals. Sep 2 '13 at 15:13

\setlength\unitlength{16.666666mm}