git subrepo clone (merge) https://github.com/HarbourMasters/otrgui.git OTRGui

subrepo:
  subdir:   "OTRGui"
  merged:   "a6066a251"
upstream:
  origin:   "https://github.com/HarbourMasters/otrgui.git"
  branch:   "master"
  commit:   "a6066a251"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

OTRGui/libs/raylib/examples/shapes/shapes_draw_ring.c

@@ -0,0 +1,96 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - draw ring (with gui options)
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Example contributed by Vlad Adrian (@demizdor) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Copyright (c) 2018 Vlad Adrian (@demizdor) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include <raylib.h>
+
+#define RAYGUI_IMPLEMENTATION
+#include "extras/raygui.h"                 // Required for GUI controls
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - draw ring");
+
+    Vector2 center = {(GetScreenWidth() - 300)/2.0f, GetScreenHeight()/2.0f };
+
+    float innerRadius = 80.0f;
+    float outerRadius = 190.0f;
+
+    float startAngle = 0.0f;
+    float endAngle = 360.0f;
+    int segments = 0;
+    int minSegments = 4;
+
+    bool drawRing = true;
+    bool drawRingLines = false;
+    bool drawCircleLines = false;
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        // NOTE: All variables update happens inside GUI control functions
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            DrawLine(500, 0, 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.6f));
+            DrawRectangle(500, 0, GetScreenWidth() - 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.3f));
+
+            if (drawRing) DrawRing(center, innerRadius, outerRadius, startAngle, endAngle, segments, Fade(MAROON, 0.3f));
+            if (drawRingLines) DrawRingLines(center, innerRadius, outerRadius, startAngle, endAngle, segments, Fade(BLACK, 0.4f));
+            if (drawCircleLines) DrawCircleSectorLines(center, outerRadius, startAngle, endAngle, segments, Fade(BLACK, 0.4f));
+
+            // Draw GUI controls
+            //------------------------------------------------------------------------------
+            startAngle = GuiSliderBar((Rectangle){ 600, 40, 120, 20 }, "StartAngle", NULL, startAngle, -450, 450);
+            endAngle = GuiSliderBar((Rectangle){ 600, 70, 120, 20 }, "EndAngle", NULL, endAngle, -450, 450);
+
+            innerRadius = GuiSliderBar((Rectangle){ 600, 140, 120, 20 }, "InnerRadius", NULL, innerRadius, 0, 100);
+            outerRadius = GuiSliderBar((Rectangle){ 600, 170, 120, 20 }, "OuterRadius", NULL, outerRadius, 0, 200);
+
+            segments = (int)GuiSliderBar((Rectangle){ 600, 240, 120, 20 }, "Segments", NULL, (float)segments, 0, 100);
+
+            drawRing = GuiCheckBox((Rectangle){ 600, 320, 20, 20 }, "Draw Ring", drawRing);
+            drawRingLines = GuiCheckBox((Rectangle){ 600, 350, 20, 20 }, "Draw RingLines", drawRingLines);
+            drawCircleLines = GuiCheckBox((Rectangle){ 600, 380, 20, 20 }, "Draw CircleLines", drawCircleLines);
+            //------------------------------------------------------------------------------
+
+            int minSegments = (int)ceilf((endAngle - startAngle) / 90);
+            DrawText(TextFormat("MODE: %s", (segments >= minSegments)? "MANUAL" : "AUTO"), 600, 270, 10, (segments >= minSegments)? MAROON : DARKGRAY);
+
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}