xaxis is the name of the object and TAxis the name of its class. Look for example to the menu named TAxis::xaxis. The curious reader will have noticed that each entry in the context menu corresponds to a method of the class. Context menus of different objects in a canvas 11.2.3.2 Structure of the Context Menus For example, TAxis::SetTitle will prompt you for a string to use for the axis title. When selecting a method from the context menu and that method has options, the user will be asked for numerical values or strings to fill in the option. Next picture shows that drawing a simple histogram involves as many as seven objects.
The image below shows the context menus for some of the objects on the canvas. On a ROOT canvas, you can right-click on any object and see the context menu for it. When designing a class, the programmer can add methods to the context menu of the object by making minor changes to the header file. The context menus are a way to interactively call certain methods of an object. Root c1->cd() 11.2.3 Context Menus: the Right Mouse Button One draws an object in the active canvas by using the statement: If several canvases are defined, there is only one active at a time. The basic whiteboard on which an object is drawn is called a canvas (defined by the class TCanvas). This class has a virtual method Draw() so all objects are supposed to be able to be “drawn”. In ROOT, most objects derive from a base class TObject. Plots and histograms are discussed in a chapter of their own. In this chapter, we are going to focus on principals of graphics and 2D objects. Graphical capabilities of ROOT range from 2D objects (lines, polygons, arrows) to various plots, histograms, and 3D graphical objects. If you think some information should be imported in the ROOT Reference Guide or in the ROOT Manual, please post your request to the ROOT Forum or via a Github Issue.ġ1 Graphics and the Graphical User Interface Instead please refer to the ROOT Reference Guide and the ROOT Manual. Some part might be obsolete or wrong, some part might be missing but still some valuable information can be found there. WARNING: This documentation is not maintained anymore. 11.3 Graphical Containers: Canvas and Pad.11.2 Interacting with Graphical Objects.11 Graphics and the Graphical User Interface.
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