Pie Chart

[bcthund]

Create an object that can have multiple categories added tied to an integer representing percentage. No check for over 100%, leave it to the user to check their numbers.

Draw one triangle per 1%, then just draw number of triangles equal to categories percentage.

Maybe get smooth circle by drawing triangles larger than desired pie size, then use shader to drop fragments outside pie diameter.

[bcthund]

• [x] Create Props_PieChart
• [x] Create base GUI_PieChart class
• [x] Integrate GUI_PieChart with GUI_Container
• [x] Add test call to runAdmin.h
• [x] Add components to GUI_PieChart
  • [x] Item list (similar to ComboBox)
  • [x] Title
  • [x] Value (percent)
  • [x] Color (reference to built-in colors)
  • [x] VAO for 1% triangle wedge
  • [x] Initial triangle
  • [x] Rotate triangle about circle center to create full circle with 100 triangles
  • [x] Draw triangles for item list first, keeping track of total % used
  • [x] Draw additional unspecified triangles for remaining %
  • [x] Label (Title for legend)
  • [x] Legend
  • [x] Draw color box
  • [x] Draw item title

[bcthund]

Additions and changes:

• [x] Highlight wedge on mouse hover in legend
• [x] Blink wedge highlight so it is more apparent
• [x] Implement scrolling for pie
• [x] Change from width/height to radius only (use border radius)
• [x] Implement update function, resize width/height in case radius changes externally
• [x] Implement addItem() function for value pointer
• [x] Implement addItem() function for value pointer and custom color
• [x] Implement addItems() function
• [x] Draw line between edges (need to implement GUI_Line first)
• [x] Add percentage overlay for selected wedge, center on pie chart
• [x] Add an option to auto calculate pie wedges based on total of all items
• [x] Add legend color box to Props for user control
• [x] Legend width handling
  • [x] Autocalc legend width option
  • [x] Calc minimum width (ignore user setting)
  • [x] Take into account color box user settings
• [x] Integrate wedge lines with border width or add option
• [x] Possibly separate wedge edge drawing to separate loop to prevent wedges from overdrawing lines