/******************************************************************************************* * * raylib [physac] example - physics restitution * * 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 "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 restitution"); // 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) floor->restitution = 1; // Create circles physics body PhysicsBody circleA = CreatePhysicsBodyCircle((Vector2){ screenWidth*0.25f, screenHeight/2 }, 30, 10); circleA->restitution = 0; PhysicsBody circleB = CreatePhysicsBodyCircle((Vector2){ screenWidth*0.5f, screenHeight/2 }, 30, 10); circleB->restitution = 0.5f; PhysicsBody circleC = CreatePhysicsBodyCircle((Vector2){ screenWidth*0.75f, screenHeight/2 }, 30, 10); circleC->restitution = 1; // Restitution demo needs a very tiny physics time step for a proper simulation SetPhysicsTimeStep(1.0/60.0/100*1000); 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('R')) // Reset physics input { // Reset circles physics bodies position and velocity circleA->position = (Vector2){ screenWidth*0.25f, screenHeight/2 }; circleA->velocity = (Vector2){ 0, 0 }; circleB->position = (Vector2){ screenWidth*0.5f, screenHeight/2 }; circleB->velocity = (Vector2){ 0, 0 }; circleC->position = (Vector2){ screenWidth*0.75f, screenHeight/2 }; circleC->velocity = (Vector2){ 0, 0 }; } //---------------------------------------------------------------------------------- // 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); 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("Restitution amount", (screenWidth - MeasureText("Restitution amount", 30))/2, 75, 30, WHITE); DrawText("0", circleA->position.x - MeasureText("0", 20)/2, circleA->position.y - 7, 20, WHITE); DrawText("0.5", circleB->position.x - MeasureText("0.5", 20)/2, circleB->position.y - 7, 20, WHITE); DrawText("1", circleC->position.x - MeasureText("1", 20)/2, circleC->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 //-------------------------------------------------------------------------------------- DestroyPhysicsBody(circleA); DestroyPhysicsBody(circleB); DestroyPhysicsBody(circleC); DestroyPhysicsBody(floor); ClosePhysics(); // Unitialize physics CloseWindow(); // Close window and OpenGL context //-------------------------------------------------------------------------------------- return 0; }