Create main.go

I created a pong Game and would like to submit it to the examples catalogue. I have debugged it and the only external dependencies are this projects and fmt.

examples/games/pong/main.go

@@ -0,0 +1,175 @@
+package main
+
+import (
+	"fmt"
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+// Game settings
+const (
+	screenWidth  = 800
+	screenHeight = 600
+)
+
+// Paddle struct
+type Paddle struct {
+	Pos    rl.Vector2
+	Width  float32
+	Height float32
+	Speed  float32
+}
+
+// Ball struct
+type Ball struct {
+	Pos    rl.Vector2
+	Speed  rl.Vector2
+	Radius float32
+}
+
+// Game struct
+type Game struct {
+	paddle1      Paddle
+	paddle2      Paddle
+	ball         Ball
+	player1Score int
+	player2Score int
+}
+
+// Check for collision between ball and paddle, and determine side
+func CheckCollisionSide(ball Ball, paddle Paddle) string {
+	closestX := rl.Clamp(ball.Pos.X, paddle.Pos.X, paddle.Pos.X+paddle.Width)
+	closestY := rl.Clamp(ball.Pos.Y, paddle.Pos.Y, paddle.Pos.Y+paddle.Height)
+
+	dx := ball.Pos.X - closestX
+	dy := ball.Pos.Y - closestY
+
+	distanceSq := dx*dx + dy*dy
+	radiusSq := ball.Radius * ball.Radius
+
+	if distanceSq <= radiusSq {
+		// Determine where it hit
+		if closestX == paddle.Pos.X || closestX == paddle.Pos.X+paddle.Width {
+			return "side"
+		}
+		if closestY == paddle.Pos.Y || closestY == paddle.Pos.Y+paddle.Height {
+			return "topbottom"
+		}
+		return "side" // fallback
+	}
+
+	return "none"
+}
+
+
+// Initialize the game state
+func (g *Game) Init() {
+	g.paddle1 = Paddle{
+		Pos:    rl.NewVector2(30, float32(screenHeight/2-50)),
+		Width:  10,
+		Height: 100,
+		Speed:  5,
+	}
+
+	g.paddle2 = Paddle{
+		Pos:    rl.NewVector2(float32(screenWidth-40), float32(screenHeight/2-50)),
+		Width:  10,
+		Height: 100,
+		Speed:  5,
+	}
+
+	g.ball = Ball{
+		Pos:    rl.NewVector2(float32(screenWidth/2), float32(screenHeight/2)),
+		Speed:  rl.NewVector2(5, 4),
+		Radius: 10,
+	}
+
+	g.player1Score = 0
+	g.player2Score = 0
+}
+
+// Game update logic
+func (g *Game) Update() {
+	// Player 1 - W/S
+	if rl.IsKeyDown(rl.KeyW) && g.paddle1.Pos.Y > 0 {
+		g.paddle1.Pos.Y -= g.paddle1.Speed
+	}
+	if rl.IsKeyDown(rl.KeyS) && g.paddle1.Pos.Y < screenHeight-g.paddle1.Height {
+		g.paddle1.Pos.Y += g.paddle1.Speed
+	}
+
+	// Player 2 - Up/Down
+	if rl.IsKeyDown(rl.KeyUp) && g.paddle2.Pos.Y > 0 {
+		g.paddle2.Pos.Y -= g.paddle2.Speed
+	}
+	if rl.IsKeyDown(rl.KeyDown) && g.paddle2.Pos.Y < screenHeight-g.paddle2.Height {
+		g.paddle2.Pos.Y += g.paddle2.Speed
+	}
+
+	// Ball movement
+	g.ball.Pos.X += g.ball.Speed.X
+	g.ball.Pos.Y += g.ball.Speed.Y
+
+	// Ball bounce off top/bottom walls
+	if g.ball.Pos.Y <= g.ball.Radius || g.ball.Pos.Y >= float32(screenHeight)-g.ball.Radius {
+		g.ball.Speed.Y *= -1
+	}
+
+	// Ball collisions with paddle sides only
+	if CheckCollisionSide(g.ball, g.paddle1) == "side" {
+		g.ball.Speed.X *= -1
+		// Reposition ball outside paddle1
+		g.ball.Pos.X = g.paddle1.Pos.X + g.paddle1.Width + g.ball.Radius
+	}
+
+	if CheckCollisionSide(g.ball, g.paddle2) == "side" {
+		g.ball.Speed.X *= -1
+		// Reposition ball outside paddle2
+		g.ball.Pos.X = g.paddle2.Pos.X - g.ball.Radius
+	}
+
+
+	// Scoring
+	if g.ball.Pos.X < 0 {
+		g.player2Score++
+		g.ball.Pos = rl.NewVector2(float32(screenWidth/2), float32(screenHeight/2))
+		g.ball.Speed.X *= -1
+	}
+	if g.ball.Pos.X > float32(screenWidth) {
+		g.player1Score++
+		g.ball.Pos = rl.NewVector2(float32(screenWidth/2), float32(screenHeight/2))
+		g.ball.Speed.X *= -1
+	}
+}
+
+// Draw game elements
+func (g *Game) Draw() {
+	// Draw paddles
+	rl.DrawRectangleV(g.paddle1.Pos, rl.NewVector2(g.paddle1.Width, g.paddle1.Height), rl.Black)
+	rl.DrawRectangleV(g.paddle2.Pos, rl.NewVector2(g.paddle2.Width, g.paddle2.Height), rl.Black)
+
+	// Draw ball
+	rl.DrawCircleV(g.ball.Pos, g.ball.Radius, rl.Black)
+
+	// Draw scores
+	rl.DrawText(fmt.Sprintf("Player 1 : %d", g.player1Score), 20, 20, 20, rl.DarkGray)
+	rl.DrawText(fmt.Sprintf("Player 2 : %d", g.player2Score), screenWidth-140, 20, 20, rl.DarkGray)
+}
+
+func main() {
+	rl.InitWindow(screenWidth, screenHeight, "Pong in Go!")
+	rl.SetTargetFPS(60)
+
+	var game Game
+	game.Init()
+
+	for !rl.WindowShouldClose() {
+		game.Update()
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+		game.Draw()
+		rl.EndDrawing()
+	}
+
+	rl.CloseWindow()
+}