How do I get a patern to do stain glass on the glass panes in my built

Hi, I do stained glass and I usually make my patterns to fit the area. I get inspiration from stained glass books or the internet. recently I took a stained glass image from a glass door from pinterest ....printed it out and used a projector to project onto paper taped to the wall to fit my area. I traced exactly the part of the image into the framed out area on my paper. I didn't copy the entire image, just the part or medallion that I wanted. I also used a ruler to be very precise and added to the image that I felt comfortable cutting the pieces of glass. If you are just using this as a pattern then you won't have to worry about what cuts are doable but this is a great way to transfer any design or image that gives you inspiration!