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/*******************************************************************************************
*
* Physac - Physics restitution
*
* 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 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
//----------------------------------------------------------------------------------
RunPhysicsStep();
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;
}
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