Draw Tree

Disclaimer

The files: bmp.c, bmp.h are NOT mine.
They are from this repository from user @wernsey and contributors.

About

Inside GeneralModule there is the program which creates the .png tree reprasentation, with a demo main.c file. (Only for the algorithm, does not compile!)

This code needs access to the fields of the nodes and therefore it should be implemented inside the tree module.

I modified my AVLTree ADT to demonstrate such an implementation.

It works with any kind of tree that has exacly 2 children, and can be easily modified, for example to color the nodes different colors to draw a red - black tree, and more.

Sample program

To compile the demo main open the initial directory in the terminal and run

make run

To show the tree after the insertion, with the function call from main, you need to add -DDRAW onto the CFLAGS.

Algorithm

The recursive functions first draws the lines from the parent to its non-NULL children, connecting their centers

Then just call the function two times for the left and right children respectively with the appropriate distance changes.

Then, since we want the line to begin at the edge we fill the circle with while and then draw its border and place the node's value at the centerl of the circle.