the draft we will convert to an image
the maximum cell size for each interlacement, calculated based on draft size and maximum canvas dimensions
boolean to render cells of the same value as floats (rather than bounded cells)
boolean to render the color of the yarn
an array of the materials currently in use in the workspace
when drafts are rendered to the screen they are drawn pixel by pixel to an Image element and rendered on the canvas. This is a much faster process than drawing as lines and shapes on a canvas.