Renamed directory: physac -> physics

Examples categories are independent from the module they use, despite in some cases module name matches category name.

1 files changed, 147 insertions, 0 deletions

diff --git a/examples/physics/physics_friction.c b/examples/physics/physics_friction.c
new file mode 100644
index 00000000..0acf88ae
--- /dev/null
+++ b/examples/physics/physics_friction.c
@@ -0,0 +1,147 @@
+/*******************************************************************************************
+*
+*   Physac - Physics friction
+*
+*   NOTE 1: Physac requires multi-threading, when InitPhysics() a second thread is created to manage physics calculations.
+*   NOTE 2: Physac requires static C library linkage to avoid dependency on MinGW DLL (-static -lpthread)
+*
+*   Use the following line to compile:
+*
+*   gcc -o $(NAME_PART).exe $(FILE_NAME) -s -static  /
+*       -lraylib -lpthread -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm /
+*       -std=c99 -Wl,--subsystem,windows -Wl,-allow-multiple-definition
+*
+*   Copyright (c) 2016-2018 Victor Fisac
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#define PHYSAC_IMPLEMENTATION
+#define PHYSAC_NO_THREADS
+#include "physac.h"
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    SetConfigFlags(FLAG_MSAA_4X_HINT);
+    InitWindow(screenWidth, screenHeight, "Physac [raylib] - Physics friction");
+
+    // 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, screenHeight }, screenWidth, 100, 10);
+    floor->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
+    PhysicsBody wall = CreatePhysicsBodyRectangle((Vector2){ screenWidth/2, screenHeight*0.8f }, 10, 80, 10);
+    wall->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
+
+    // Create left ramp physics body
+    PhysicsBody rectLeft = CreatePhysicsBodyRectangle((Vector2){ 25, screenHeight - 5 }, 250, 250, 10);
+    rectLeft->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
+    SetPhysicsBodyRotation(rectLeft, 30*DEG2RAD);
+
+    // Create right ramp  physics body
+    PhysicsBody rectRight = CreatePhysicsBodyRectangle((Vector2){ screenWidth - 25, screenHeight - 5 }, 250, 250, 10);
+    rectRight->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
+    SetPhysicsBodyRotation(rectRight, 330*DEG2RAD);
+
+    // Create dynamic physics bodies
+    PhysicsBody bodyA = CreatePhysicsBodyRectangle((Vector2){ 35, screenHeight*0.6f }, 40, 40, 10);
+    bodyA->staticFriction = 0.1f;
+    bodyA->dynamicFriction = 0.1f;
+    SetPhysicsBodyRotation(bodyA, 30*DEG2RAD);
+
+    PhysicsBody bodyB = CreatePhysicsBodyRectangle((Vector2){ screenWidth - 35, screenHeight*0.6f }, 40, 40, 10);
+    bodyB->staticFriction = 1.0f;
+    bodyB->dynamicFriction = 1.0f;
+    SetPhysicsBodyRotation(bodyB, 330*DEG2RAD);
+
+    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
+        //----------------------------------------------------------------------------------
+        RunPhysicsStep();
+
+        if (IsKeyPressed('R'))    // Reset physics input
+        {
+            // Reset dynamic physics bodies position, velocity and rotation
+            bodyA->position = (Vector2){ 35, screenHeight*0.6f };
+            bodyA->velocity = (Vector2){ 0, 0 };
+            bodyA->angularVelocity = 0;
+            SetPhysicsBodyRotation(bodyA, 30*DEG2RAD);
+
+            bodyB->position = (Vector2){ screenWidth - 35, screenHeight*0.6f };
+            bodyB->velocity = (Vector2){ 0, 0 };
+            bodyB->angularVelocity = 0;
+            SetPhysicsBodyRotation(bodyB, 330*DEG2RAD);
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(BLACK);
+
+            DrawFPS(screenWidth - 90, screenHeight - 30);
+
+            // Draw created physics bodies
+            int 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
+                    }
+                }
+            }
+
+            DrawRectangle(0, screenHeight - 49, screenWidth, 49, BLACK);
+
+            DrawText("Friction amount", (screenWidth - MeasureText("Friction amount", 30))/2, 75, 30, WHITE);
+            DrawText("0.1", bodyA->position.x - MeasureText("0.1", 20)/2, bodyA->position.y - 7, 20, WHITE);
+            DrawText("1", bodyB->position.x - MeasureText("1", 20)/2, bodyB->position.y - 7, 20, WHITE);
+
+            DrawText("Press 'R' to reset example", 10, 10, 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;
+}