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+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1041783.svg)](https://doi.org/10.5281/zenodo.1041783)
+# tkblt
+Introduction to the TkBLT library
+
+TkBLT is a library of extensions to the Tk library. It adds new
+commands and variables to the application's interpreter.
+
+TkBLT is a derived version of the BLT Toolkit by George A. Howlett,
+for Tcl/Tk 8.5/8.6, is TEA compatible, with full support for MacOSX and
+Windows, and is fully compatible with the Tk API. TkBLT is released
+under the original BSD license. TkBLT includes only the Graph and
+Barchart Tk widgets, and the Tcl Vector command.
+
+The following commands are added to the interpreter from the TkBLT library:
+
+Graph: A 2D plotting widget. Plots two variable data in a window with an optional 
+legend and annotations. It has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+
+Barchart: A barchart widget. Plots two-variable data as rectangular bars in a 
+window. The x-coordinate values designate the position of the bar along 
+the x-axis, while the y-coordinate values designate the magnitude.
+The barchart widget has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+
+Vector: Creates a vector of floating point values. The vector's components
+can be manipulated in three ways: through a Tcl array variable, a Tcl
+command, or the C API.