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142 lines
5.5 KiB
142 lines
5.5 KiB
/*******************************************************************************************
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*
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* Physac - Physics demo
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*
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* NOTE 1: Physac requires multi-threading, when InitPhysics() a second thread is created to manage physics calculations.
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* NOTE 2: Physac requires static C library linkage to avoid dependency on MinGW DLL (-static -lpthread)
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*
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* Use the following line to compile:
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*
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* gcc -o $(NAME_PART).exe $(FILE_NAME) -s -static /
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* -lraylib -lpthread -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm /
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* -std=c99 -Wl,--subsystem,windows -Wl,-allow-multiple-definition
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*
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* Copyright (c) 2016-2018 Victor Fisac
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*
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********************************************************************************************/
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#include "raylib.h"
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#define PHYSAC_IMPLEMENTATION
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#define PHYSAC_NO_THREADS
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#include "physac.h"
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int main()
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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int screenWidth = 800;
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int screenHeight = 450;
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SetConfigFlags(FLAG_MSAA_4X_HINT);
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InitWindow(screenWidth, screenHeight, "Physac [raylib] - Physics demo");
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// Physac logo drawing position
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int logoX = screenWidth - MeasureText("Physac", 30) - 10;
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int logoY = 15;
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bool needsReset = false;
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// Initialize physics and default physics bodies
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InitPhysics();
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// Create floor rectangle physics body
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PhysicsBody floor = CreatePhysicsBodyRectangle((Vector2){ screenWidth/2, screenHeight }, 500, 100, 10);
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floor->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
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// Create obstacle circle physics body
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PhysicsBody circle = CreatePhysicsBodyCircle((Vector2){ screenWidth/2, screenHeight/2 }, 45, 10);
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circle->enabled = false; // Disable body state to convert it to static (no dynamics, but collisions)
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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// Delay initialization of variables due to physics reset async
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RunPhysicsStep();
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if (needsReset)
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{
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floor = CreatePhysicsBodyRectangle((Vector2){ screenWidth/2, screenHeight }, 500, 100, 10);
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floor->enabled = false;
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circle = CreatePhysicsBodyCircle((Vector2){ screenWidth/2, screenHeight/2 }, 45, 10);
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circle->enabled = false;
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needsReset = false;
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}
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// Reset physics input
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if (IsKeyPressed('R'))
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{
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ResetPhysics();
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needsReset = true;
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}
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// Physics body creation inputs
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if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) CreatePhysicsBodyPolygon(GetMousePosition(), GetRandomValue(20, 80), GetRandomValue(3, 8), 10);
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else if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) CreatePhysicsBodyCircle(GetMousePosition(), GetRandomValue(10, 45), 10);
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// Destroy falling physics bodies
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int bodiesCount = GetPhysicsBodiesCount();
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for (int i = bodiesCount - 1; i >= 0; i--)
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{
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PhysicsBody body = GetPhysicsBody(i);
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if (body != NULL && (body->position.y > screenHeight*2)) DestroyPhysicsBody(body);
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(BLACK);
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DrawFPS(screenWidth - 90, screenHeight - 30);
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// Draw created physics bodies
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bodiesCount = GetPhysicsBodiesCount();
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for (int i = 0; i < bodiesCount; i++)
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{
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PhysicsBody body = GetPhysicsBody(i);
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if (body != NULL)
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{
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int vertexCount = GetPhysicsShapeVerticesCount(i);
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for (int j = 0; j < vertexCount; j++)
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{
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// Get physics bodies shape vertices to draw lines
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// Note: GetPhysicsShapeVertex() already calculates rotation transformations
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Vector2 vertexA = GetPhysicsShapeVertex(body, j);
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int jj = (((j + 1) < vertexCount) ? (j + 1) : 0); // Get next vertex or first to close the shape
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Vector2 vertexB = GetPhysicsShapeVertex(body, jj);
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DrawLineV(vertexA, vertexB, GREEN); // Draw a line between two vertex positions
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}
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}
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}
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DrawText("Left mouse button to create a polygon", 10, 10, 10, WHITE);
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DrawText("Right mouse button to create a circle", 10, 25, 10, WHITE);
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DrawText("Press 'R' to reset example", 10, 40, 10, WHITE);
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DrawText("Physac", logoX, logoY, 30, WHITE);
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DrawText("Powered by", logoX + 50, logoY - 7, 10, WHITE);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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ClosePhysics(); // Unitialize physics
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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