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pipes.go
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pipes.go
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package main
import (
"fmt"
"math/rand"
"time"
"sync"
"github.com/veandco/go-sdl2/img"
"github.com/veandco/go-sdl2/sdl"
)
type pipes struct {
mu sync.RWMutex
texture *sdl.Texture
speed int32
pipes []*pipe
}
type pipe struct {
mu sync.RWMutex
x, width, height int32
inverted bool
}
func newPipes(r *sdl.Renderer) (*pipes, error) {
t, err := img.LoadTexture(r, "res/imgs/pipe.png")
if err != nil {
return nil, fmt.Errorf("Error while rendering pipe image: %v", err)
}
ps := &pipes{
texture: t,
speed: 2,
}
go func() {
for {
ps.mu.Lock()
ps.pipes = append(ps.pipes, newPipe())
ps.mu.Unlock()
time.Sleep(time.Second)
}
}()
return ps, nil
}
func (ps *pipes) paint(r *sdl.Renderer) error {
ps.mu.RLock()
defer ps.mu.RUnlock()
for _, p := range ps.pipes {
if err := p.paint(r, ps.texture); err != nil {
return err
}
}
return nil
}
func (ps *pipes) restart() {
ps.mu.Lock()
ps.mu.Unlock()
ps.pipes = nil
}
func (ps *pipes) update() {
ps.mu.Lock()
ps.mu.Unlock()
var rem []*pipe
for _, p := range ps.pipes {
p.update(ps.speed)
if p.x+p.width > 0 {
rem = append(rem, p)
}
}
ps.pipes = rem
}
func (ps *pipes) destroy() {
ps.mu.Lock()
ps.mu.Unlock()
ps.texture.Destroy()
}
func (ps *pipes) touch(b *bird) {
ps.mu.RLock()
defer ps.mu.RUnlock()
for _, p := range ps.pipes {
p.touch(b)
}
}
func newPipe() *pipe {
return &pipe{
x: 800,
height: 100 + int32(rand.Intn(300)),
width: 50,
inverted: rand.Float32() > 0.5,
}
}
func (p *pipe) paint(r *sdl.Renderer, texture *sdl.Texture) error {
p.mu.RLock()
defer p.mu.RUnlock()
rect := &sdl.Rect{W: p.width, H: p.height, X: p.x, Y: 600 - p.height}
flip := sdl.FLIP_NONE
if p.inverted {
rect.Y = 0
flip = sdl.FLIP_VERTICAL
}
err := r.CopyEx(texture, nil, rect, 0, nil, flip)
if err != nil {
return fmt.Errorf("Error while copying background: %v", err)
}
return nil
}
func (p *pipe) update(speed int32) {
p.mu.Lock()
p.mu.Unlock()
p.x -= speed
}
func (p *pipe) touch(b *bird) {
p.mu.RLock()
defer p.mu.RUnlock()
b.touch(p)
}