Mathematica: Manipulate
In this video, I use a graphics example to demonstrate different ways in which you can use the "Manipulate" function to interact with your Mathematica Notebook. I cover using single variable sliders (including setting a step size), colour sliders and a 2D-slider.
Further Reading:
How would you cross-hatch a shape in Mathematica?
Can you find any other Manipulate sliders that are of interest?
How can you animate a Manipulate-widget and export this as a video?