This should be pretty self-explanatory. Press the green flag to start the engine. Drag the sliders labeled "Color 1", "Color 2" and "Color 3" to change the color that the corresponding part of the pie chart will be. The circle below shows you what the color you selected looks like. Press the "Draw!" button to generate a NEW pie chart. It will ask you for values 1, 2, and 3. Insert any number you want. The sum does not have to equal 100 as I have algorithms set to check percentages. To save your current chart, or the one that is being displayed, press "Save" and follow the instructions there. To load a chart, press "Load" and insert a save code. The chart you upload should appear on the screen. If you're tired of watching each chart get drawn out, try turbo mode (shift + green flag) for an instant rendering. If you only want two sections instead of three, make the third value zero and my calculator won't render it.
Concept, code, and algorithms by me. I may add some more sections so that people can make more charts with larger numbers of pieces. What do you think? Should I do it?