Triangular is a tool I developed to design a cover of the Creative Review magazine.
You place points with your mouse and the tool draws connecting lines between the points, if the lines don't overlap any existing lines.
Click + Drag a point to move it.
Shift + Click a point or line to remove it.
The resulting grid is colored using the four color theorem, which states that, given any separation of a plane into contiguous regions, no more than four colors are required to color the regions of the plane so that no two adjacent regions have the same color.
This tool is a work in process.