/******************************************************************************************* * * raylib [physac] example - Forces * * 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) * * Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5) * ********************************************************************************************/ #include "raylib.h" #define PHYSAC_IMPLEMENTATION #include "physac.h" #include #define FORCE_AMOUNT 5.0f #define FORCE_RADIUS 150 #define LINE_LENGTH 75 #define TRIANGLE_LENGTH 12 void* PhysicsThread(void *arg); int main() { // Initialization //-------------------------------------------------------------------------------------- int screenWidth = 800; int screenHeight = 450; InitWindow(screenWidth, screenHeight, "raylib [physac] example - forces"); InitPhysics((Vector2){ 0.0f, -9.81f/2 }); // Initialize physics module // Global variables Vector2 mousePosition; bool isDebug = false; // Create rectangle physic objects PhysicBody rectangles[3]; for (int i = 0; i < 3; i++) { rectangles[i] = CreatePhysicBody((Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/3) : (screenHeight/1.5f)) }, 0.0f, (Vector2){ 50, 50 }); rectangles[i]->rigidbody.enabled = true; // Enable physic object rigidbody behaviour rectangles[i]->rigidbody.friction = 0.1f; } // Create circles physic objects // NOTE: when creating circle physic objects, transform.scale must be { 0, 0 } and object radius must be defined in collider.radius and use this value to draw the circle. PhysicBody circles[3]; for (int i = 0; i < 3; i++) { circles[i] = CreatePhysicBody((Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/1.5f) : (screenHeight/4)) }, 0.0f, (Vector2){ 0, 0 }); circles[i]->rigidbody.enabled = true; // Enable physic object rigidbody behaviour circles[i]->rigidbody.friction = 0.1f; circles[i]->collider.type = COLLIDER_CIRCLE; circles[i]->collider.radius = 25; } // Create walls physic objects PhysicBody leftWall = CreatePhysicBody((Vector2){ -25, screenHeight/2 }, 0.0f, (Vector2){ 50, screenHeight }); PhysicBody rightWall = CreatePhysicBody((Vector2){ screenWidth + 25, screenHeight/2 }, 0.0f, (Vector2){ 50, screenHeight }); PhysicBody topWall = CreatePhysicBody((Vector2){ screenWidth/2, -25 }, 0.0f, (Vector2){ screenWidth, 50 }); PhysicBody bottomWall = CreatePhysicBody((Vector2){ screenWidth/2, screenHeight + 25 }, 0.0f, (Vector2){ screenWidth, 50 }); // Create physics thread pthread_t tid; pthread_create(&tid, NULL, &PhysicsThread, NULL); SetTargetFPS(60); //-------------------------------------------------------------------------------------- // Main game loop while (!WindowShouldClose()) // Detect window close button or ESC key { // Update //---------------------------------------------------------------------------------- // Update mouse position value mousePosition = GetMousePosition(); // Check force input if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) ApplyForceAtPosition(mousePosition, FORCE_AMOUNT, FORCE_RADIUS); // Check reset input if (IsKeyPressed('R')) { // Reset rectangle physic objects positions for (int i = 0; i < 3; i++) { rectangles[i]->transform.position = (Vector2){ screenWidth/4*(i+1) - rectangles[i]->transform.scale.x/2, (((i % 2) == 0) ? (screenHeight/3) : (screenHeight/1.5f)) - rectangles[i]->transform.scale.y/2 }; rectangles[i]->rigidbody.velocity =(Vector2){ 0.0f, 0.0f }; } // Reset circles physic objects positions for (int i = 0; i < 3; i++) { circles[i]->transform.position = (Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/1.5f) : (screenHeight/4)) }; circles[i]->rigidbody.velocity =(Vector2){ 0.0f, 0.0f }; } } // Check debug switch input if (IsKeyPressed('P')) isDebug = !isDebug; //---------------------------------------------------------------------------------- // Draw //---------------------------------------------------------------------------------- BeginDrawing(); ClearBackground(RAYWHITE); // Draw rectangles for (int i = 0; i < 3; i++) { // Convert transform values to rectangle data type variable DrawRectangleRec(TransformToRectangle(rectangles[i]->transform), RED); if (isDebug) DrawRectangleLines(rectangles[i]->collider.bounds.x, rectangles[i]->collider.bounds.y, rectangles[i]->collider.bounds.width, rectangles[i]->collider.bounds.height, GREEN); // Draw force radius DrawCircleLines(mousePosition.x, mousePosition.y, FORCE_RADIUS, BLACK); // Draw direction lines if (CheckCollisionPointCircle((Vector2){ rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 }, mousePosition, FORCE_RADIUS)) { Vector2 direction = { rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2 - mousePosition.x, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 - mousePosition.y }; float angle = atan2l(direction.y, direction.x); // Calculate arrow start and end positions Vector2 startPosition = { rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 }; Vector2 endPosition = { rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2 + (cos(angle)*LINE_LENGTH), rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 + (sin(angle)*LINE_LENGTH) }; // Draw arrow line DrawLineV(startPosition, endPosition, BLACK); // Draw arrow triangle DrawTriangleLines((Vector2){ endPosition.x - cos(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH, endPosition.y - sin(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH }, (Vector2){ endPosition.x + cos(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH, endPosition.y + sin(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH }, (Vector2){ endPosition.x + cos(angle)*LINE_LENGTH/TRIANGLE_LENGTH*2, endPosition.y + sin(angle)*LINE_LENGTH/TRIANGLE_LENGTH*2 }, BLACK); } } // Draw circles for (int i = 0; i < 3; i++) { DrawCircleV(circles[i]->transform.position, circles[i]->collider.radius, BLUE); if (isDebug) DrawCircleLines(circles[i]->transform.position.x, circles[i]->transform.position.y, circles[i]->collider.radius, GREEN); // Draw force radius DrawCircleLines(mousePosition.x, mousePosition.y, FORCE_RADIUS, BLACK); // Draw direction lines if (CheckCollisionPointCircle((Vector2){ circles[i]->transform.position.x, circles[i]->transform.position.y }, mousePosition, FORCE_RADIUS)) { Vector2 direction = { circles[i]->transform.position.x - mousePosition.x, circles[i]->transform.position.y - mousePosition.y }; float angle = atan2l(direction.y, direction.x); // Calculate arrow start and end positions Vector2 startPosition = { circles[i]->transform.position.x, circles[i]->transform.position.y }; Vector2 endPosition = { circles[i]->transform.position.x + (cos(angle)*LINE_LENGTH), circles[i]->transform.position.y + (sin(angle)*LINE_LENGTH) }; // Draw arrow line DrawLineV(startPosition, endPosition, BLACK); // Draw arrow triangle DrawTriangleLines((Vector2){ endPosition.x - cos(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH, endPosition.y - sin(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH }, (Vector2){ endPosition.x + cos(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH, endPosition.y + sin(angle + 90*DEG2RAD)*LINE_LENGTH/TRIANGLE_LENGTH }, (Vector2){ endPosition.x + cos(angle)*LINE_LENGTH/TRIANGLE_LENGTH*2, endPosition.y + sin(angle)*LINE_LENGTH/TRIANGLE_LENGTH*2 }, BLACK); } } // Draw help messages DrawText("Use LEFT MOUSE BUTTON to apply a force", screenWidth/2 - MeasureText("Use LEFT MOUSE BUTTON to apply a force", 20)/2, screenHeight*0.075f, 20, LIGHTGRAY); DrawText("Use R to reset objects position", screenWidth/2 - MeasureText("Use R to reset objects position", 20)/2, screenHeight*0.875f, 20, GRAY); EndDrawing(); //---------------------------------------------------------------------------------- } // De-Initialization //-------------------------------------------------------------------------------------- pthread_cancel(tid); // Destroy physics thread ClosePhysics(); // Unitialize physics module CloseWindow(); // Close window and OpenGL context //-------------------------------------------------------------------------------------- return 0; } void* PhysicsThread(void *arg) { // Initialize time variables double currentTime = GetTime(); double previousTime = currentTime; // Physics update loop while (!WindowShouldClose()) { currentTime = GetTime(); double deltaTime = (double)(currentTime - previousTime); previousTime = currentTime; // Delta time value needs to be inverse multiplied by physics time step value (1/target fps) UpdatePhysics(deltaTime/PHYSICS_TIMESTEP); } return NULL; }