ignore sunflow output
rename x to n
get animation frame count
add sepia and purple colors
primitive for drawing a line
load a sequence of images on disk into an array
show render errors
line midpoint
reverse the direction of a line
interpolate along the length of a line [0,1]
get x and y for a rect
primitive for drawing a Rect2D
Merge pull request #28 from d2fn/spatial-index