You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
221 lines
8.2 KiB
221 lines
8.2 KiB
/*******************************************************************************************
|
|
*
|
|
* raylib [shapes] example - ball physics
|
|
*
|
|
* Example complexity rating: [★★☆☆] 2/4
|
|
*
|
|
* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
|
|
*
|
|
* Example contributed by David Buzatto (@davidbuzatto) and reviewed by Ramon Santamaria (@raysan5)
|
|
*
|
|
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
|
|
* BSD-like license that allows static linking with closed source software
|
|
*
|
|
* Copyright (c) 2025 David Buzatto (@davidbuzatto)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#define MAX_BALLS 5000 // Maximum quantity of balls
|
|
|
|
typedef struct Ball {
|
|
Vector2 pos; // Position
|
|
Vector2 vel; // Velocity
|
|
Vector2 ppos; // Previous position
|
|
float radius;
|
|
float friction;
|
|
float elasticity;
|
|
Color color;
|
|
bool grabbed;
|
|
} Ball;
|
|
|
|
//------------------------------------------------------------------------------------
|
|
// Program main entry point
|
|
//------------------------------------------------------------------------------------
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
|
|
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - ball physics");
|
|
|
|
Ball balls[MAX_BALLS] = {{
|
|
.pos = { GetScreenWidth()/2, GetScreenHeight()/2 },
|
|
.vel = { 200, 200 },
|
|
.ppos = { 0 },
|
|
.radius = 40,
|
|
.friction = 0.99,
|
|
.elasticity = 0.9,
|
|
.color = BLUE,
|
|
.grabbed = false
|
|
}};
|
|
|
|
int ballCount = 1;
|
|
Ball *grabbedBall = NULL; // A pointer to the current ball that is grabbed
|
|
Vector2 pressOffset = {0}; // Mouse press offset relative to the ball that grabbedd
|
|
|
|
float gravity = 100; // World gravity
|
|
|
|
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
|
|
//----------------------------------------------------------------------------------
|
|
float delta = GetFrameTime();
|
|
Vector2 mousePos = GetMousePosition();
|
|
|
|
// Checks if a ball was grabbed
|
|
if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))
|
|
{
|
|
for (int i = ballCount - 1; i >= 0; i--)
|
|
{
|
|
Ball *ball = &balls[i];
|
|
pressOffset.x = mousePos.x - ball->pos.x;
|
|
pressOffset.y = mousePos.y - ball->pos.y;
|
|
|
|
// If the distance between the ball position and the mouse press position
|
|
// is less than or equal to the ball radius, the event occurred inside the ball
|
|
if (hypot(pressOffset.x, pressOffset.y) <= ball->radius)
|
|
{
|
|
ball->grabbed = true;
|
|
grabbedBall = ball;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Releases any ball the was grabbed
|
|
if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT))
|
|
{
|
|
if (grabbedBall != NULL)
|
|
{
|
|
grabbedBall->grabbed = false;
|
|
grabbedBall = NULL;
|
|
}
|
|
}
|
|
|
|
// Creates a new ball
|
|
if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT) || (IsKeyDown(KEY_LEFT_CONTROL) && IsMouseButtonDown(MOUSE_BUTTON_RIGHT)))
|
|
{
|
|
if (ballCount < MAX_BALLS)
|
|
{
|
|
balls[ballCount++] = (Ball){
|
|
.pos = mousePos,
|
|
.vel = { GetRandomValue(-300, 300), GetRandomValue(-300, 300) },
|
|
.ppos = { 0 },
|
|
.radius = 20 + GetRandomValue(0, 30),
|
|
.friction = 0.99,
|
|
.elasticity = 0.9,
|
|
.color = { GetRandomValue(0, 255), GetRandomValue(0, 255), GetRandomValue(0, 255), 255 },
|
|
.grabbed = false
|
|
};
|
|
}
|
|
}
|
|
|
|
// Shake balls
|
|
if (IsMouseButtonPressed(MOUSE_BUTTON_MIDDLE))
|
|
{
|
|
for (int i = 0; i < ballCount; i++)
|
|
{
|
|
if (!balls[i].grabbed) balls[i].vel = (Vector2){ GetRandomValue(-2000, 2000), GetRandomValue(-2000, 2000) };
|
|
}
|
|
}
|
|
|
|
// Changes gravity
|
|
gravity += GetMouseWheelMove()*5;
|
|
|
|
// Updates each ball state
|
|
for (int i = 0; i < ballCount; i++)
|
|
{
|
|
Ball *ball = &balls[i];
|
|
|
|
// The ball is not grabbed
|
|
if (!ball->grabbed)
|
|
{
|
|
// Ball repositioning using the velocity
|
|
ball->pos.x += ball->vel.x * delta;
|
|
ball->pos.y += ball->vel.y * delta;
|
|
|
|
// Does the ball hit the screen right boundary?
|
|
if ((ball->pos.x + ball->radius) >= screenWidth)
|
|
{
|
|
ball->pos.x = screenWidth - ball->radius; // Ball repositioning
|
|
ball->vel.x = -ball->vel.x*ball->elasticity; // Elasticity makes the ball lose 10% of its velocity on hit
|
|
}
|
|
// Does the ball hit the screen left boundary?
|
|
else if ((ball->pos.x - ball->radius) <= 0)
|
|
{
|
|
ball->pos.x = ball->radius;
|
|
ball->vel.x = -ball->vel.x*ball->elasticity;
|
|
}
|
|
|
|
// The same for y axis
|
|
if ((ball->pos.y + ball->radius) >= screenHeight)
|
|
{
|
|
ball->pos.y = screenHeight - ball->radius;
|
|
ball->vel.y = -ball->vel.y*ball->elasticity;
|
|
}
|
|
else if ((ball->pos.y - ball->radius) <= 0)
|
|
{
|
|
ball->pos.y = ball->radius;
|
|
ball->vel.y = -ball->vel.y*ball->elasticity;
|
|
}
|
|
|
|
// Friction makes the ball lose 1% of its velocity each frame
|
|
ball->vel.x = ball->vel.x*ball->friction;
|
|
// Gravity affects only the y axis
|
|
ball->vel.y = ball->vel.y*ball->friction + gravity;
|
|
}
|
|
else
|
|
{
|
|
// Ball repositioning using the mouse position
|
|
ball->pos.x = mousePos.x - pressOffset.x;
|
|
ball->pos.y = mousePos.y - pressOffset.y;
|
|
|
|
// While the ball is grabbed, recalculates its velocity
|
|
ball->vel.x = (ball->pos.x - ball->ppos.x)/delta;
|
|
ball->vel.y = (ball->pos.y - ball->ppos.y)/delta;
|
|
ball->ppos = ball->pos;
|
|
}
|
|
}
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
BeginDrawing();
|
|
|
|
ClearBackground(RAYWHITE);
|
|
|
|
for (int i = 0; i < ballCount; i++)
|
|
{
|
|
DrawCircleV(balls[i].pos, balls[i].radius, balls[i].color);
|
|
DrawCircleLinesV(balls[i].pos, balls[i].radius, BLACK);
|
|
}
|
|
|
|
DrawText("grab a ball by pressing with the mouse and throw it by releasing", 10, 10, 10, DARKGRAY);
|
|
DrawText("right click to create new balls (keep left control pressed to create a lot)", 10, 30, 10, DARKGRAY);
|
|
DrawText("use mouse wheel to change gravity", 10, 50, 10, DARKGRAY);
|
|
DrawText("middle click to shake", 10, 70, 10, DARKGRAY);
|
|
DrawText(TextFormat("BALL COUNT: %d", ballCount), 10, GetScreenHeight() - 70, 20, BLACK);
|
|
DrawText(TextFormat("GRAVITY: %.2f", gravity), 10, GetScreenHeight() - 40, 20, BLACK);
|
|
|
|
EndDrawing();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|