Jdo300

Hello, I have a couple of questions concerning printing images to scale. I have a program I made that displays a graph of a spiral on the screen. When I run my equations in the program, I use pixels as my units of measurement, and the graph ticks are also marked off in pixels. But I also want to be able to have the user enter equation parameters in inches and have the graph image display the tick marks in inches and print off in inches as well. I looked around for conversion formulas and some were talking about how you have to take the DPI of the printer into consideration. I’m just curious to know if there is an easier way to converting the pixels to inches and have the image graph print out in inch units on the real paper. If this sounds a bit confusing, I can elaborate on it if someone responds.



Thanks,

Jason O

DaftasBrush

Use TWIPS

If you work in twips instead, you can ignore the DPI of a printer, as the output size will be a certain number of twips (1440 say)
and the printer will print as many pixels (dots) as it needs to get that, so a 300DPI printer will print 300 dots in that inch.

HTH

passel

Or you could set the ScaleMode to Inches (ScaleMode = vbInches).
Then everything you draw you would specify in inches (fractions of an inch, most likely).
You would set the Printers.ScaleMode to Inches as well, and then draw on the printer the
same way. (Of course, you can use twips, as DaftasBrush says, or points, for that matter, since they are directly related to inches, 72 points per inch, 20 twips per point).