ROOT::Experimental::RTreeMapBase Class Reference

Base logic for drawing a treemap visualization.

A treemap can be used for analyzing a hierarchical data structure whose elements have a certain size. It visualizes this hierarchical data as nested rectangles which allows for easy comparison of proportions within categories, but also the whole structure. The squarification algorithm is used to make these rectangles as close to squares as possible for visual clarity.

Furthermore, we assume that each node has a type and that the size of a non-leaf node equals to the total size of its children. This allows for drawing a legend of types of leaf nodes, and see which types occupy how much of the total space.

Note: this visualization class/technique is independent/unrelated to TTree.

Definition at line 42 of file RTreeMapBase.hxx.

Classes
struct	Node
struct	Rect
struct	RGBColor
struct	Vec2

Public Member Functions
	RTreeMapBase ()=default
virtual	~RTreeMapBase ()=default

Public Attributes
std::vector< Node >	fNodes

Protected Member Functions
virtual void	AddBox (const Rect &rect, const RGBColor &color, float borderWidth=0.15f) const =0
	Logic for drawing a box.
virtual void	AddText (const Vec2 &pos, const std::string &content, float size, const RGBColor &color=RGBColor(0, 0, 0), bool alignCenter=false) const =0
	Logic for drawing a text.
void	DrawLegend () const
	Logic for drawing the legend of leaf types.
void	DrawTreeMap (const Node &elem, Rect rect, int depth) const
	Logic for drawing the entirety of the treemap.

#include <ROOT/RTreeMapBase.hxx>

Inheritance diagram for ROOT::Experimental::RTreeMapBase:

Constructor & Destructor Documentation

RTreeMapBase()

ROOT::Experimental::RTreeMapBase::RTreeMapBase ( )

default

~RTreeMapBase()

virtual ROOT::Experimental::RTreeMapBase::~RTreeMapBase ( )

virtualdefault

Member Function Documentation

AddBox()

virtual void ROOT::Experimental::RTreeMapBase::AddBox ( const Rect & rect, const RGBColor & color, float borderWidth = 0.15f ) const

protectedpure virtual

Logic for drawing a box.

Implemented in ROOT::Experimental::RTreeMapPainter.

AddText()

virtual void ROOT::Experimental::RTreeMapBase::AddText ( const Vec2 & pos, const std::string & content, float size, const RGBColor & color = RGBColor(0, 0, 0), bool alignCenter = false ) const

protectedpure virtual

Logic for drawing a text.

Implemented in ROOT::Experimental::RTreeMapPainter.

DrawLegend()

void RTreeMapBase::DrawLegend ( ) const

protected

Logic for drawing the legend of leaf types.

Definition at line 156 of file RTreeMapBase.cxx.

DrawTreeMap()

void RTreeMapBase::DrawTreeMap ( const Node & elem, RTreeMapBase::Rect rect, int depth ) const

protected

Logic for drawing the entirety of the treemap.

Definition at line 191 of file RTreeMapBase.cxx.

Member Data Documentation

fNodes

std::vector<Node> ROOT::Experimental::RTreeMapBase::fNodes

Definition at line 68 of file RTreeMapBase.hxx.