How to colour different enclosed areas in Excel Chart

Take the attached chart for example. It's a triangle graph with D, E, F as % from 0 to 100% on each axis. E+F+D=100%. I would like to colour areas D1, D2, DT, T3, T1, T2, and P into different colour. Each of the areas is enclosed by straight lines that can be shown on the table for graph. Test data dot will be floating on the chart graph from one area to another when test data (D, E, F coordinates)changes. Much appreciate if anyone can offer help. Thanks.