The example shows how to plot one-dimensional graphs using wrappers around qcustomplot library.
The application model contains a collection of various items to
properly separate scientific data from presentation data.
It's an item to hold the one-dimensional vector of double values and information
about axis binning. Data1DItem is not intended for direct plotting and needs GraphItem for that.
It's an item that contains a link to certain Data1DItem and serves as a wrapper around scientific data. Its main purpose is to carry the additional data for presentation purposes: the title of the graph, the color of the line, etc. GraphItem is not intended for direct plotting and needs GraphViewportItem for that.
It's an item that can have an arbitrary amount of GraphItem's on board. Additionally, it contains items to store the data related to viewport axes: current zoom level, axis title, etc. GraphViewportItem needs GraphCanvas for plotting.
It is a widget, wrapper around QCustomPlot, provided with status string.
It shows the content of GraphViewportItem on the screen and establishes the signaling between QCustomPlot and SessionModel.
When the user zooms in into QCustomPlot with the mouse wheel, the data of the model is updated. If the user then saves a project file, all zoom levels will be automatically preserved.