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/physics/physics_demo.c

@@ -0,0 +1,128 @@
+/*******************************************************************************************
+*
+*   raylib [physac] example - physics demo
+*
+*   This example has been created using raylib 1.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   This example uses physac 1.1 (https://github.com/raysan5/raylib/blob/master/src/physac.h)
+*
+*   Copyright (c) 2016-2021 Victor Fisac (@victorfisac) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#define PHYSAC_IMPLEMENTATION
+#include "extras/physac.h"
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    SetConfigFlags(FLAG_MSAA_4X_HINT);
+    InitWindow(screenWidth, screenHeight, "raylib [physac] example - physics demo");
+
+    // Physac logo drawing position
+    int logoX = screenWidth - MeasureText("Physac", 30) - 10;
+    int logoY = 15;
+
+    // Initialize physics and default physics bodies
+    InitPhysics();
+
+    // Create floor rectangle physics body
+    PhysicsBody floor = CreatePhysicsBodyRectangle((Vector2){ screenWidth/2.0f, (float)screenHeight }, 500, 100, 10);
+    floor->enabled = false;         // Disable body state to convert it to static (no dynamics, but collisions)
+
+    // Create obstacle circle physics body
+    PhysicsBody circle = CreatePhysicsBodyCircle((Vector2){ screenWidth/2.0f, screenHeight/2.0f }, 45, 10);
+    circle->enabled = false;        // Disable body state to convert it to static (no dynamics, but collisions)
+
+    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
+        //----------------------------------------------------------------------------------
+        UpdatePhysics();            // Update physics system
+
+        if (IsKeyPressed(KEY_R))    // Reset physics system
+        {
+            ResetPhysics();
+
+            floor = CreatePhysicsBodyRectangle((Vector2){ screenWidth/2.0f, (float)screenHeight }, 500, 100, 10);
+            floor->enabled = false;
+
+            circle = CreatePhysicsBodyCircle((Vector2){ screenWidth/2.0f, screenHeight/2.0f }, 45, 10);
+            circle->enabled = false;
+        }
+
+        // Physics body creation inputs
+        if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) CreatePhysicsBodyPolygon(GetMousePosition(), (float)GetRandomValue(20, 80), GetRandomValue(3, 8), 10);
+        else if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT)) CreatePhysicsBodyCircle(GetMousePosition(), (float)GetRandomValue(10, 45), 10);
+
+        // Destroy falling physics bodies
+        int bodiesCount = GetPhysicsBodiesCount();
+        for (int i = bodiesCount - 1; i >= 0; i--)
+        {
+            PhysicsBody body = GetPhysicsBody(i);
+            if (body != NULL && (body->position.y > screenHeight*2)) DestroyPhysicsBody(body);
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(BLACK);
+
+            DrawFPS(screenWidth - 90, screenHeight - 30);
+
+            // Draw created physics bodies
+            bodiesCount = GetPhysicsBodiesCount();
+            for (int i = 0; i < bodiesCount; i++)
+            {
+                PhysicsBody body = GetPhysicsBody(i);
+
+                if (body != NULL)
+                {
+                    int vertexCount = GetPhysicsShapeVerticesCount(i);
+                    for (int j = 0; j < vertexCount; j++)
+                    {
+                        // Get physics bodies shape vertices to draw lines
+                        // Note: GetPhysicsShapeVertex() already calculates rotation transformations
+                        Vector2 vertexA = GetPhysicsShapeVertex(body, j);
+
+                        int jj = (((j + 1) < vertexCount) ? (j + 1) : 0);   // Get next vertex or first to close the shape
+                        Vector2 vertexB = GetPhysicsShapeVertex(body, jj);
+
+                        DrawLineV(vertexA, vertexB, GREEN);     // Draw a line between two vertex positions
+                    }
+                }
+            }
+
+            DrawText("Left mouse button to create a polygon", 10, 10, 10, WHITE);
+            DrawText("Right mouse button to create a circle", 10, 25, 10, WHITE);
+            DrawText("Press 'R' to reset example", 10, 40, 10, WHITE);
+
+            DrawText("Physac", logoX, logoY, 30, WHITE);
+            DrawText("Powered by", logoX + 50, logoY - 7, 10, WHITE);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    ClosePhysics();       // Unitialize physics
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}