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package main
import (
_ "embed"
"github.com/gen2brain/raylib-go/raylib"
"math"
"strconv"
)
const (
screenWidth = 1920
screenHeight = 1080
ballSpeed = 5
paddleSpeed = 5
)
func printCenter(text string, size int32, color rl.Color) {
rl.DrawText(text, screenWidth/2-rl.MeasureText(text, size), screenHeight/2, size, color)
}
type rect rl.Rectangle
func (r rect) bottom() float32 {
return r.Y + r.Height
}
func (r rect) right() float32 {
return r.X + r.Width
}
func (r rect) collides(s rect) bool {
return rl.CheckCollisionRecs(rl.Rectangle(r), rl.Rectangle(s))
}
func (r rect) draw(color rl.Color) {
rl.DrawRectangleRec(rl.Rectangle(r), color)
}
type ball struct {
pos rl.Vector2
velocity rl.Vector2
}
func (b *ball) bounds() rect {
const ballSize = 30
return rect{
X: b.pos.X,
Y: b.pos.Y,
Width: ballSize,
Height: ballSize,
}
}
func (b *ball) predictIntersection(targetX float32) (float32, bool) {
if b.velocity.X <= 0 {
return 0, false
}
x := b.pos.X
y := b.pos.Y
velocity := b.velocity
dist := targetX - x
prediction := y + velocity.Y*dist/velocity.X
if prediction < 0 {
bounces := int(-prediction / screenHeight)
if bounces%2 == 0 {
return -prediction - float32(screenHeight*bounces), true
}
return prediction + float32(screenHeight*(bounces+1)), true
}
if prediction > screenHeight {
bounces := int(prediction / screenHeight)
if bounces%2 == 0 {
return prediction - float32(screenHeight*bounces), true
}
return -prediction + float32(screenHeight*(bounces+1)), true
}
return prediction, true
}
type side int
const (
left side = iota
right
)
func (b *ball) reset(side side) {
b.pos = rl.Vector2{X: screenWidth / 2, Y: screenHeight / 2}
b.velocity = rl.Vector2{X: ballSpeed}
if side == left {
b.velocity.X = -b.velocity.X
}
}
type paddle struct {
pos float32
side side
}
func (p *paddle) bounds() rect {
const (
paddleHeight = 200
thickness = 10
padding = 100
)
r := rect{
X: padding - thickness/2,
Y: p.pos - paddleHeight/2,
Width: thickness,
Height: paddleHeight,
}
if p.side == right {
r.X = screenWidth - padding - thickness/2
}
return r
}
//go:embed ping.mp3
var pingMP3 []byte
func main() {
rl.InitWindow(screenWidth, screenHeight, "pongo")
defer rl.CloseWindow()
rl.SetTargetFPS(120)
rl.InitAudioDevice()
defer rl.CloseAudioDevice()
pingWave := rl.LoadWaveFromMemory(".mp3", pingMP3, int32(len(pingMP3)))
defer rl.UnloadWave(pingWave)
ping := rl.LoadSoundFromWave(pingWave)
defer rl.UnloadSound(ping)
playerScore := 0
aiScore := 0
var ball ball
ball.reset(left)
paddle1 := paddle{pos: screenHeight / 2, side: left}
paddle2 := paddle{pos: screenHeight / 2, side: right}
for !rl.WindowShouldClose() {
switch {
case rl.IsKeyDown(rl.KeyUp) && paddle1.bounds().Y >= 0:
paddle1.pos -= paddleSpeed
case rl.IsKeyDown(rl.KeyDown) && paddle1.bounds().bottom() <= screenHeight:
paddle1.pos += paddleSpeed
}
if prediction, ok := ball.predictIntersection(paddle2.bounds().X); ok {
switch {
case paddle2.pos < prediction && paddle2.bounds().bottom() <= screenHeight:
paddle2.pos += paddleSpeed
case paddle2.pos > prediction && paddle2.bounds().Y >= 0:
paddle2.pos -= paddleSpeed
}
}
ball.pos = rl.Vector2Add(ball.pos, ball.velocity)
switch {
case ball.bounds().collides(paddle1.bounds()):
rl.PlaySound(ping)
d := ball.pos.Y - paddle1.pos
if d < 0 {
d = -d
}
angle := d / (paddle1.bounds().Height/2 + ball.bounds().Height) * (75 * 2 * math.Pi / 360)
if ball.pos.Y < paddle1.pos {
angle = -angle
}
speed := ballSpeed * (1 + 4*d/(paddle1.bounds().Height/2+ball.bounds().Height))
ball.velocity = rl.Vector2{X: speed * float32(math.Cos(float64(angle))), Y: speed * float32(math.Sin(float64(angle)))}
case ball.bounds().collides(paddle2.bounds()):
rl.PlaySound(ping)
d := ball.pos.Y - paddle2.pos
if d < 0 {
d = -d
}
angle := d / (paddle2.bounds().Height/2 + ball.bounds().Height) * (75 * 2 * math.Pi / 360)
if ball.pos.Y < paddle2.pos {
angle = -angle
}
angle += math.Pi
speed := ballSpeed * (1 + 4*d/(paddle2.bounds().Height/2+ball.bounds().Height))
ball.velocity = rl.Vector2{X: speed * float32(math.Cos(float64(angle))), Y: speed * float32(math.Sin(float64(angle)))}
case ball.bounds().right() <= paddle1.bounds().X:
aiScore++
ball.reset(right)
case ball.bounds().X >= paddle2.bounds().X:
playerScore++
ball.reset(left)
case ball.bounds().Y <= 0 || ball.bounds().bottom() >= screenHeight:
ball.velocity.Y = -ball.velocity.Y
rl.PlaySound(ping)
}
rl.BeginDrawing()
rl.ClearBackground(rl.Black)
rl.DrawLine(screenWidth/2, 0, screenWidth/2, screenHeight, rl.Gray)
paddle1.bounds().draw(rl.RayWhite)
paddle2.bounds().draw(rl.RayWhite)
ball.bounds().draw(rl.RayWhite)
const fontSize = 120
rl.DrawText(strconv.Itoa(playerScore), int32(paddle1.bounds().X)+20, 30, fontSize, rl.RayWhite)
rl.DrawText(strconv.Itoa(aiScore), int32(paddle2.bounds().X)-rl.MeasureText("9999", fontSize), 30, fontSize, rl.RayWhite)
rl.EndDrawing()
}
}
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