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scene.go
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scene.go
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// Copyright 2017 Google Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to writing, software distributed
// under the License is distributed on a "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"log"
"time"
"github.com/veandco/go-sdl2/sdl"
img "github.com/veandco/go-sdl2/sdl_image"
)
type scene struct {
bg *sdl.Texture
bird *bird
pipes *pipes
}
func newScene(r *sdl.Renderer) (*scene, error) {
bg, err := img.LoadTexture(r, "res/imgs/background.png")
if err != nil {
return nil, fmt.Errorf("could not load background image: %v", err)
}
b, err := newBird(r)
if err != nil {
return nil, err
}
ps, err := newPipes(r)
if err != nil {
return nil, err
}
return &scene{bg: bg, bird: b, pipes: ps}, nil
}
func (s *scene) run(events <-chan sdl.Event, r *sdl.Renderer) <-chan error {
errc := make(chan error)
go func() {
defer close(errc)
tick := time.Tick(10 * time.Millisecond)
for {
select {
case e := <-events:
if done := s.handleEvent(e); done {
return
}
case <-tick:
s.update()
if s.bird.isDead() {
drawTitle(r, "Game Over")
time.Sleep(time.Second)
s.restart()
}
if err := s.paint(r); err != nil {
errc <- err
}
}
}
}()
return errc
}
func (s *scene) handleEvent(event sdl.Event) bool {
switch event.(type) {
case *sdl.QuitEvent:
return true
case *sdl.MouseButtonEvent:
s.bird.jump()
case *sdl.MouseMotionEvent, *sdl.WindowEvent, *sdl.TouchFingerEvent, *sdl.CommonEvent:
default:
log.Printf("unknown event %T", event)
}
return false
}
func (s *scene) update() {
s.bird.update()
s.pipes.update()
s.pipes.touch(s.bird)
}
func (s *scene) restart() {
s.bird.restart()
s.pipes.restart()
}
func (s *scene) paint(r *sdl.Renderer) error {
r.Clear()
if err := r.Copy(s.bg, nil, nil); err != nil {
return fmt.Errorf("could not copy background: %v", err)
}
if err := s.bird.paint(r); err != nil {
return err
}
if err := s.pipes.paint(r); err != nil {
return err
}
r.Present()
return nil
}
func (s *scene) destroy() {
s.bg.Destroy()
s.bird.destroy()
s.pipes.destroy()
}