ebiten/examples/dropfile/main.go

133 lines
2.7 KiB
Go

// Copyright 2023 The Ebitengine Authors
//
// 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 in writing, software
// distributed under the License is distributed on an "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 (
"image/png"
"io/fs"
"log"
"sync"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
type Game struct {
images []*ebiten.Image
err error
m sync.Mutex
}
func (g *Game) Update() error {
if err := func() error {
g.m.Lock()
defer g.m.Unlock()
return g.err
}(); err != nil {
return err
}
if files := ebiten.DroppedFiles(); files != nil {
go func() {
if err := fs.WalkDir(files, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
fi, err := d.Info()
if err != nil {
return err
}
log.Printf("Name: %s, Size: %d, IsDir: %t, ModTime: %v", fi.Name(), fi.Size(), fi.IsDir(), fi.ModTime())
f, err := files.Open(path)
if err != nil {
return err
}
defer func() {
_ = f.Close()
}()
img, err := png.Decode(f)
if err != nil {
return nil
}
eimg := ebiten.NewImageFromImage(img)
g.m.Lock()
g.images = append(g.images, eimg)
g.m.Unlock()
return nil
}); err != nil {
g.m.Lock()
if g.err == nil {
g.err = err
}
g.m.Unlock()
}
}()
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
g.m.Lock()
defer g.m.Unlock()
if len(g.images) == 0 {
ebitenutil.DebugPrint(screen, "Drop PNG files onto this window!")
return
}
const imageSize = 128
xcount := screen.Bounds().Dx() / imageSize
if xcount == 0 {
return
}
for i, img := range g.images {
x := (i % xcount) * imageSize
y := (i / xcount) * imageSize
s := imageSize / float64(img.Bounds().Dx())
if sy := imageSize / float64(img.Bounds().Dy()); s > sy {
s = sy
}
if s > 1 {
s = 1
}
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(s, s)
op.GeoM.Translate(float64(x), float64(y))
op.Filter = ebiten.FilterLinear
screen.DrawImage(img, op)
}
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return outsideWidth, outsideHeight
}
func main() {
ebiten.SetWindowResizable(true)
ebiten.SetWindowTitle("Dropping Files (Ebitengine Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}